summaryrefslogtreecommitdiffstats
path: root/test/escape_struct_param1.go
diff options
context:
space:
mode:
Diffstat (limited to 'test/escape_struct_param1.go')
-rw-r--r--test/escape_struct_param1.go298
1 files changed, 298 insertions, 0 deletions
diff --git a/test/escape_struct_param1.go b/test/escape_struct_param1.go
new file mode 100644
index 0000000..496172c
--- /dev/null
+++ b/test/escape_struct_param1.go
@@ -0,0 +1,298 @@
+// 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)
+}
generated by cgit v1.2.3 (git 2.39.1) at 2024-07-27 16:55:36 +0000