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https://github.com/golang/go
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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>
298 lines
8.9 KiB
Go
298 lines
8.9 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 *struct function parameters.
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// Note companion strict_param2 checks struct function parameters with similar tests.
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package notmain
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var Ssink *string
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type U struct {
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_sp *string
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_spp **string
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}
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type V struct {
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_u U
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_up *U
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_upp **U
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}
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func (u *U) SP() *string { // ERROR "leaking param: u to result ~r0 level=1$"
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return u._sp
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}
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func (u *U) SPP() **string { // ERROR "leaking param: u to result ~r0 level=1$"
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return u._spp
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}
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func (u *U) SPPi() *string { // ERROR "leaking param: u to result ~r0 level=2$"
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return *u._spp
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}
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func tSPPi() {
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s := "cat" // ERROR "moved to heap: s$"
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ps := &s
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pps := &ps
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pu := &U{ps, pps} // ERROR "&U{...} does not escape$"
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Ssink = pu.SPPi()
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}
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func tiSPP() {
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s := "cat" // ERROR "moved to heap: s$"
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ps := &s
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pps := &ps
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pu := &U{ps, pps} // ERROR "&U{...} does not escape$"
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Ssink = *pu.SPP()
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}
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// BAD: need fine-grained (field-sensitive) analysis to avoid spurious escape of ps
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func tSP() {
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s := "cat" // ERROR "moved to heap: s$"
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ps := &s // ERROR "moved to heap: ps$"
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pps := &ps
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pu := &U{ps, pps} // ERROR "&U{...} does not escape$"
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Ssink = pu.SP()
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}
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func (v *V) u() U { // ERROR "leaking param: v to result ~r0 level=1$"
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return v._u
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}
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func (v *V) UP() *U { // ERROR "leaking param: v to result ~r0 level=1$"
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return v._up
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}
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func (v *V) UPP() **U { // ERROR "leaking param: v to result ~r0 level=1$"
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return v._upp
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}
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func (v *V) UPPia() *U { // ERROR "leaking param: v to result ~r0 level=2$"
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return *v._upp
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}
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func (v *V) UPPib() *U { // ERROR "leaking param: v to result ~r0 level=2$"
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return *v.UPP()
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}
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func (v *V) USPa() *string { // ERROR "leaking param: v to result ~r0 level=1$"
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return v._u._sp
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}
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func (v *V) USPb() *string { // ERROR "leaking param: v to result ~r0 level=1$"
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return v.u()._sp
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}
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func (v *V) USPPia() *string { // ERROR "leaking param: v to result ~r0 level=2$"
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return *v._u._spp
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}
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func (v *V) USPPib() *string { // ERROR "leaking param: v to result ~r0 level=2$"
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return v._u.SPPi()
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}
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func (v *V) UPiSPa() *string { // ERROR "leaking param: v to result ~r0 level=2$"
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return v._up._sp
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}
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func (v *V) UPiSPb() *string { // ERROR "leaking param: v to result ~r0 level=2$"
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return v._up.SP()
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}
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func (v *V) UPiSPc() *string { // ERROR "leaking param: v to result ~r0 level=2$"
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return v.UP()._sp
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}
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func (v *V) UPiSPd() *string { // ERROR "leaking param: v to result ~r0 level=2$"
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return v.UP().SP()
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}
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// BAD: need fine-grained (field-sensitive) analysis to avoid spurious escape of all but &s3
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func tUPiSPa() {
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s1 := "ant"
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s2 := "bat" // ERROR "moved to heap: s2$"
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s3 := "cat" // ERROR "moved to heap: s3$"
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s4 := "dog" // ERROR "moved to heap: s4$"
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s5 := "emu" // ERROR "moved to heap: s5$"
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s6 := "fox" // ERROR "moved to heap: s6$"
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ps2 := &s2
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ps4 := &s4 // ERROR "moved to heap: ps4$"
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ps6 := &s6 // ERROR "moved to heap: ps6$"
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u1 := U{&s1, &ps2}
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u2 := &U{&s3, &ps4} // ERROR "&U{...} does not escape$"
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u3 := &U{&s5, &ps6} // ERROR "&U{...} escapes to heap$"
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v := &V{u1, u2, &u3} // ERROR "&V{...} does not escape$"
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Ssink = v.UPiSPa() // Ssink = &s3 (only &s3 really escapes)
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}
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// BAD: need fine-grained (field-sensitive) analysis to avoid spurious escape of all but &s3
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func tUPiSPb() {
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s1 := "ant"
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s2 := "bat" // ERROR "moved to heap: s2$"
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s3 := "cat" // ERROR "moved to heap: s3$"
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s4 := "dog" // ERROR "moved to heap: s4$"
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s5 := "emu" // ERROR "moved to heap: s5$"
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s6 := "fox" // ERROR "moved to heap: s6$"
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ps2 := &s2
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ps4 := &s4 // ERROR "moved to heap: ps4$"
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ps6 := &s6 // ERROR "moved to heap: ps6$"
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u1 := U{&s1, &ps2}
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u2 := &U{&s3, &ps4} // ERROR "&U{...} does not escape$"
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u3 := &U{&s5, &ps6} // ERROR "&U{...} escapes to heap$"
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v := &V{u1, u2, &u3} // ERROR "&V{...} does not escape$"
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Ssink = v.UPiSPb() // Ssink = &s3 (only &s3 really escapes)
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}
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// BAD: need fine-grained (field-sensitive) analysis to avoid spurious escape of all but &s3
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func tUPiSPc() {
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s1 := "ant"
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s2 := "bat" // ERROR "moved to heap: s2$"
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s3 := "cat" // ERROR "moved to heap: s3$"
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s4 := "dog" // ERROR "moved to heap: s4$"
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s5 := "emu" // ERROR "moved to heap: s5$"
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s6 := "fox" // ERROR "moved to heap: s6$"
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ps2 := &s2
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ps4 := &s4 // ERROR "moved to heap: ps4$"
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ps6 := &s6 // ERROR "moved to heap: ps6$"
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u1 := U{&s1, &ps2}
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u2 := &U{&s3, &ps4} // ERROR "&U{...} does not escape$"
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u3 := &U{&s5, &ps6} // ERROR "&U{...} escapes to heap$"
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v := &V{u1, u2, &u3} // ERROR "&V{...} does not escape$"
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Ssink = v.UPiSPc() // Ssink = &s3 (only &s3 really escapes)
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}
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// BAD: need fine-grained (field-sensitive) analysis to avoid spurious escape of all but &s3
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func tUPiSPd() {
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s1 := "ant"
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s2 := "bat" // ERROR "moved to heap: s2$"
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s3 := "cat" // ERROR "moved to heap: s3$"
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s4 := "dog" // ERROR "moved to heap: s4$"
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s5 := "emu" // ERROR "moved to heap: s5$"
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s6 := "fox" // ERROR "moved to heap: s6$"
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ps2 := &s2
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ps4 := &s4 // ERROR "moved to heap: ps4$"
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ps6 := &s6 // ERROR "moved to heap: ps6$"
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u1 := U{&s1, &ps2}
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u2 := &U{&s3, &ps4} // ERROR "&U{...} does not escape$"
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u3 := &U{&s5, &ps6} // ERROR "&U{...} escapes to heap$"
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v := &V{u1, u2, &u3} // ERROR "&V{...} does not escape$"
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Ssink = v.UPiSPd() // Ssink = &s3 (only &s3 really escapes)
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}
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func (v V) UPiSPPia() *string { // ERROR "leaking param: v to result ~r0 level=2$"
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return *v._up._spp
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}
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func (v V) UPiSPPib() *string { // ERROR "leaking param: v to result ~r0 level=2$"
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return v._up.SPPi()
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}
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func (v V) UPiSPPic() *string { // ERROR "leaking param: v to result ~r0 level=2$"
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return *v.UP()._spp
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}
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func (v V) UPiSPPid() *string { // ERROR "leaking param: v to result ~r0 level=2$"
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return v.UP().SPPi()
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}
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// BAD: need fine-grained (field-sensitive) analysis to avoid spurious escape of all but &s4
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func tUPiSPPia() {
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s1 := "ant"
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s2 := "bat"
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s3 := "cat"
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s4 := "dog" // ERROR "moved to heap: s4$"
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s5 := "emu" // ERROR "moved to heap: s5$"
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s6 := "fox" // ERROR "moved to heap: s6$"
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ps2 := &s2
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ps4 := &s4
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ps6 := &s6 // ERROR "moved to heap: ps6$"
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u1 := U{&s1, &ps2}
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u2 := &U{&s3, &ps4} // ERROR "&U{...} does not escape$"
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u3 := &U{&s5, &ps6} // ERROR "&U{...} does not escape$"
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v := &V{u1, u2, &u3} // ERROR "&V{...} does not escape$"
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Ssink = v.UPiSPPia() // Ssink = *&ps4 = &s4 (only &s4 really escapes)
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}
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// BAD: need fine-grained (field-sensitive) analysis to avoid spurious escape of all but &s4
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func tUPiSPPib() {
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s1 := "ant"
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s2 := "bat"
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s3 := "cat"
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s4 := "dog" // ERROR "moved to heap: s4$"
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s5 := "emu" // ERROR "moved to heap: s5$"
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s6 := "fox" // ERROR "moved to heap: s6$"
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ps2 := &s2
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ps4 := &s4
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ps6 := &s6 // ERROR "moved to heap: ps6$"
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u1 := U{&s1, &ps2}
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u2 := &U{&s3, &ps4} // ERROR "&U{...} does not escape$"
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u3 := &U{&s5, &ps6} // ERROR "&U{...} does not escape$"
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v := &V{u1, u2, &u3} // ERROR "&V{...} does not escape$"
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Ssink = v.UPiSPPib() // Ssink = *&ps4 = &s4 (only &s4 really escapes)
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}
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// BAD: need fine-grained (field-sensitive) analysis to avoid spurious escape of all but &s4
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func tUPiSPPic() {
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s1 := "ant"
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s2 := "bat"
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s3 := "cat"
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s4 := "dog" // ERROR "moved to heap: s4$"
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s5 := "emu" // ERROR "moved to heap: s5$"
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s6 := "fox" // ERROR "moved to heap: s6$"
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ps2 := &s2
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ps4 := &s4
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ps6 := &s6 // ERROR "moved to heap: ps6$"
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u1 := U{&s1, &ps2}
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u2 := &U{&s3, &ps4} // ERROR "&U{...} does not escape$"
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u3 := &U{&s5, &ps6} // ERROR "&U{...} does not escape$"
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v := &V{u1, u2, &u3} // ERROR "&V{...} does not escape$"
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Ssink = v.UPiSPPic() // Ssink = *&ps4 = &s4 (only &s4 really escapes)
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}
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// BAD: need fine-grained (field-sensitive) analysis to avoid spurious escape of all but &s4
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func tUPiSPPid() {
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s1 := "ant"
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s2 := "bat"
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s3 := "cat"
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s4 := "dog" // ERROR "moved to heap: s4$"
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s5 := "emu" // ERROR "moved to heap: s5$"
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s6 := "fox" // ERROR "moved to heap: s6$"
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ps2 := &s2
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ps4 := &s4
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ps6 := &s6 // ERROR "moved to heap: ps6$"
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u1 := U{&s1, &ps2}
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u2 := &U{&s3, &ps4} // ERROR "&U{...} does not escape$"
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u3 := &U{&s5, &ps6} // ERROR "&U{...} does not escape$"
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v := &V{u1, u2, &u3} // ERROR "&V{...} does not escape$"
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Ssink = v.UPiSPPid() // Ssink = *&ps4 = &s4 (only &s4 really escapes)
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}
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func (v *V) UPPiSPPia() *string { // ERROR "leaking param: v to result ~r0 level=4$"
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return *(*v._upp)._spp
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}
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// This test isolates the one value that needs to escape, not because
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// it distinguishes fields but because it knows that &s6 is the only
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// value reachable by two indirects from v.
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// The test depends on the level cap in the escape analysis tags
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// being able to encode that fact.
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func tUPPiSPPia() {
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s1 := "ant"
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s2 := "bat"
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s3 := "cat"
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s4 := "dog"
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s5 := "emu"
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s6 := "fox" // ERROR "moved to heap: s6$"
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ps2 := &s2
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ps4 := &s4
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ps6 := &s6
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u1 := U{&s1, &ps2}
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u2 := &U{&s3, &ps4} // ERROR "&U{...} does not escape$"
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u3 := &U{&s5, &ps6} // ERROR "&U{...} does not escape$"
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v := &V{u1, u2, &u3} // ERROR "&V{...} does not escape$"
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Ssink = v.UPPiSPPia() // Ssink = *&ps6 = &s6 (only &s6 really escapes)
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}
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