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606019cb4b
This information is redundant with the position information already
provided. Also, no other -m diagnostics print out function name.
While here, report parameter leak diagnostics against the parameter
declaration position rather than the function, and use Warnl for
"moved to heap" messages.
Test cases updated programmatically by removing the first word from
every "no match for" error emitted by run.go:
go run run.go |& \
sed -E -n 's/^(.*):(.*): no match for `([^ ]* (.*))` in:$/\1!\2!\3!\4/p' | \
while IFS='!' read -r fn line before after; do
before=$(echo "$before" | sed 's/[.[\*^$()+?{|]/\\&/g')
after=$(echo "$after" | sed -E 's/(\&|\\)/\\&/g')
fn=$(find . -name "${fn}" | head -1)
sed -i -E -e "${line}s/\"${before}\"/\"${after}\"/" "${fn}"
done
Passes toolstash-check.
Change-Id: I6e02486b1409e4a8dbb2b9b816d22095835426b5
Reviewed-on: https://go-review.googlesource.com/c/go/+/195040
Run-TryBot: Matthew Dempsky <mdempsky@google.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Cherry Zhang <cherryyz@google.com>
299 lines
9.5 KiB
Go
299 lines
9.5 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_param1 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=0$"
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return u._sp
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}
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func (u U) SPP() **string { // ERROR "leaking param: u to result ~r0 level=0$"
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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=1$"
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return *u._spp
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}
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func tSPPi() {
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s := "cat" // ERROR "moved to heap: s$"
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ps := &s
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pps := &ps
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pu := &U{ps, pps} // ERROR "&U literal 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 literal does not escape$"
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Ssink = *pu.SPP()
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}
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// BAD: need fine-grained analysis to avoid spurious escape of ps
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func tSP() {
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s := "cat" // ERROR "moved to heap: s$"
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ps := &s // ERROR "moved to heap: ps$"
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pps := &ps
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pu := &U{ps, pps} // ERROR "&U literal does not escape$"
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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=0$"
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return v._u
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}
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func (v V) UP() *U { // ERROR "leaking param: v to result ~r0 level=0$"
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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=0$"
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return v._upp
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}
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func (v V) UPPia() *U { // ERROR "leaking param: v to result ~r0 level=1$"
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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=1$"
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return *v.UPP()
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}
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func (v V) USPa() *string { // ERROR "leaking param: v to result ~r0 level=0$"
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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=0$"
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return v.u()._sp
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}
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func (v V) USPPia() *string { // ERROR "leaking param: v to result ~r0 level=1$"
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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=1$"
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return v._u.SPPi()
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}
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func (v V) UPiSPa() *string { // ERROR "leaking param: v to result ~r0 level=1$"
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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=1$"
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return v._up.SP()
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}
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func (v V) UPiSPc() *string { // ERROR "leaking param: v to result ~r0 level=1$"
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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=1$"
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return v.UP().SP()
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}
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// BAD: need fine-grained (field-sensitive) analysis to avoid spurious escape of all but &s3
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func tUPiSPa() {
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s1 := "ant"
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s2 := "bat" // ERROR "moved to heap: s2$"
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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 literal does not escape$"
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u3 := &U{&s5, &ps6} // ERROR "&U literal escapes to heap$"
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v := &V{u1, u2, &u3} // ERROR "&V literal 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 literal does not escape$"
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u3 := &U{&s5, &ps6} // ERROR "&U literal escapes to heap$"
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v := &V{u1, u2, &u3} // ERROR "&V literal 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 literal does not escape$"
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u3 := &U{&s5, &ps6} // ERROR "&U literal escapes to heap$"
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v := &V{u1, u2, &u3} // ERROR "&V literal 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 literal does not escape$"
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u3 := &U{&s5, &ps6} // ERROR "&U literal escapes to heap$"
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v := &V{u1, u2, &u3} // ERROR "&V literal 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$"
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u1 := U{&s1, &ps2}
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u2 := &U{&s3, &ps4} // ERROR "&U literal does not escape$"
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u3 := &U{&s5, &ps6} // ERROR "&U literal does not escape$"
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v := &V{u1, u2, &u3} // ERROR "&V literal does not escape$"
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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 literal does not escape$"
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u3 := &U{&s5, &ps6} // ERROR "&U literal does not escape$"
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v := &V{u1, u2, &u3} // ERROR "&V literal 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$"
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u1 := U{&s1, &ps2}
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u2 := &U{&s3, &ps4} // ERROR "&U literal does not escape$"
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u3 := &U{&s5, &ps6} // ERROR "&U literal does not escape$"
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v := &V{u1, u2, &u3} // ERROR "&V literal does not escape$"
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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 literal does not escape$"
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u3 := &U{&s5, &ps6} // ERROR "&U literal does not escape$"
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v := &V{u1, u2, &u3} // ERROR "&V literal does not escape$"
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Ssink = v.UPiSPPid() // Ssink = *&ps4 = &s4 (only &s4 really escapes)
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}
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func (v V) UPPiSPPia() *string { // ERROR "leaking param: v to result ~r0 level=3$"
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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() { // This test is sensitive to the level cap in function summary results.
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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$"
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ps2 := &s2
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ps4 := &s4
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ps6 := &s6
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u1 := U{&s1, &ps2}
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u2 := &U{&s3, &ps4} // ERROR "&U literal does not escape$"
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u3 := &U{&s5, &ps6} // ERROR "&U literal does not escape$"
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v := &V{u1, u2, &u3} // ERROR "&V literal does not escape$"
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Ssink = v.UPPiSPPia() // Ssink = *&ps6 = &s6 (only &s6 really escapes)
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}
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