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Diffstat (limited to '')
| -rw-r--r-- | test/escape_param.go | 441 |
1 files changed, 441 insertions, 0 deletions
diff --git a/test/escape_param.go b/test/escape_param.go new file mode 100644 index 0000000..993e914 --- /dev/null +++ b/test/escape_param.go @@ -0,0 +1,441 @@ +// 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 function parameters. + +// In this test almost everything is BAD except the simplest cases +// where input directly flows to output. + +package escape + +func zero() int { return 0 } + +var sink interface{} + +// in -> out +func param0(p *int) *int { // ERROR "leaking param: p to result ~r1" + return p +} + +func caller0a() { + i := 0 + _ = param0(&i) +} + +func caller0b() { + i := 0 // ERROR "moved to heap: i$" + sink = param0(&i) +} + +// in, in -> out, out +func param1(p1, p2 *int) (*int, *int) { // ERROR "leaking param: p1 to result ~r2" "leaking param: p2 to result ~r3" + return p1, p2 +} + +func caller1() { + i := 0 // ERROR "moved to heap: i$" + j := 0 + sink, _ = param1(&i, &j) +} + +// in -> other in +func param2(p1 *int, p2 **int) { // ERROR "leaking param: p1$" "p2 does not escape$" + *p2 = p1 +} + +func caller2a() { + i := 0 // ERROR "moved to heap: i$" + var p *int + param2(&i, &p) + _ = p +} + +func caller2b() { + i := 0 // ERROR "moved to heap: i$" + var p *int + param2(&i, &p) + sink = p +} + +func paramArraySelfAssign(p *PairOfPairs) { // ERROR "p does not escape" + p.pairs[0] = p.pairs[1] // ERROR "ignoring self-assignment in p.pairs\[0\] = p.pairs\[1\]" +} + +func paramArraySelfAssignUnsafeIndex(p *PairOfPairs) { // ERROR "leaking param content: p" + // Function call inside index disables self-assignment case to trigger. + p.pairs[zero()] = p.pairs[1] + p.pairs[zero()+1] = p.pairs[1] +} + +type PairOfPairs struct { + pairs [2]*Pair +} + +type BoxedPair struct { + pair *Pair +} + +type WrappedPair struct { + pair Pair +} + +func leakParam(x interface{}) { // ERROR "leaking param: x" + sink = x +} + +func sinkAfterSelfAssignment1(box *BoxedPair) { // ERROR "leaking param content: box" + box.pair.p1 = box.pair.p2 // ERROR "ignoring self-assignment in box.pair.p1 = box.pair.p2" + sink = box.pair.p2 +} + +func sinkAfterSelfAssignment2(box *BoxedPair) { // ERROR "leaking param content: box" + box.pair.p1 = box.pair.p2 // ERROR "ignoring self-assignment in box.pair.p1 = box.pair.p2" + sink = box.pair +} + +func sinkAfterSelfAssignment3(box *BoxedPair) { // ERROR "leaking param content: box" + box.pair.p1 = box.pair.p2 // ERROR "ignoring self-assignment in box.pair.p1 = box.pair.p2" + leakParam(box.pair.p2) +} + +func sinkAfterSelfAssignment4(box *BoxedPair) { // ERROR "leaking param content: box" + box.pair.p1 = box.pair.p2 // ERROR "ignoring self-assignment in box.pair.p1 = box.pair.p2" + leakParam(box.pair) +} + +func selfAssignmentAndUnrelated(box1, box2 *BoxedPair) { // ERROR "leaking param content: box2" "box1 does not escape" + box1.pair.p1 = box1.pair.p2 // ERROR "ignoring self-assignment in box1.pair.p1 = box1.pair.p2" + leakParam(box2.pair.p2) +} + +func notSelfAssignment1(box1, box2 *BoxedPair) { // ERROR "leaking param content: box2" "box1 does not escape" + box1.pair.p1 = box2.pair.p1 +} + +func notSelfAssignment2(p1, p2 *PairOfPairs) { // ERROR "leaking param content: p2" "p1 does not escape" + p1.pairs[0] = p2.pairs[1] +} + +func notSelfAssignment3(p1, p2 *PairOfPairs) { // ERROR "leaking param content: p2" "p1 does not escape" + p1.pairs[0].p1 = p2.pairs[1].p1 +} + +func boxedPairSelfAssign(box *BoxedPair) { // ERROR "box does not escape" + box.pair.p1 = box.pair.p2 // ERROR "ignoring self-assignment in box.pair.p1 = box.pair.p2" +} + +func wrappedPairSelfAssign(w *WrappedPair) { // ERROR "w does not escape" + w.pair.p1 = w.pair.p2 // ERROR "ignoring self-assignment in w.pair.p1 = w.pair.p2" +} + +// in -> in +type Pair struct { + p1 *int + p2 *int +} + +func param3(p *Pair) { // ERROR "p does not escape" + p.p1 = p.p2 // ERROR "param3 ignoring self-assignment in p.p1 = p.p2" +} + +func caller3a() { + i := 0 + j := 0 + p := Pair{&i, &j} + param3(&p) + _ = p +} + +func caller3b() { + i := 0 // ERROR "moved to heap: i$" + j := 0 // ERROR "moved to heap: j$" + p := Pair{&i, &j} + param3(&p) + sink = p // ERROR "p escapes to heap$" +} + +// in -> rcvr +func (p *Pair) param4(i *int) { // ERROR "p does not escape$" "leaking param: i$" + p.p1 = i +} + +func caller4a() { + i := 0 // ERROR "moved to heap: i$" + p := Pair{} + p.param4(&i) + _ = p +} + +func caller4b() { + i := 0 // ERROR "moved to heap: i$" + p := Pair{} + p.param4(&i) + sink = p // ERROR "p escapes to heap$" +} + +// in -> heap +func param5(i *int) { // ERROR "leaking param: i$" + sink = i +} + +func caller5() { + i := 0 // ERROR "moved to heap: i$" + param5(&i) +} + +// *in -> heap +func param6(i ***int) { // ERROR "leaking param content: i$" + sink = *i +} + +func caller6a() { + i := 0 // ERROR "moved to heap: i$" + p := &i // ERROR "moved to heap: p$" + p2 := &p + param6(&p2) +} + +// **in -> heap +func param7(i ***int) { // ERROR "leaking param content: i$" + sink = **i +} + +func caller7() { + i := 0 // ERROR "moved to heap: i$" + p := &i + p2 := &p + param7(&p2) +} + +// **in -> heap +func param8(i **int) { // ERROR "i does not escape$" + sink = **i // ERROR "\* \(\*i\) escapes to heap" +} + +func caller8() { + i := 0 + p := &i + param8(&p) +} + +// *in -> out +func param9(p ***int) **int { // ERROR "leaking param: p to result ~r1 level=1" + return *p +} + +func caller9a() { + i := 0 + p := &i + p2 := &p + _ = param9(&p2) +} + +func caller9b() { + i := 0 // ERROR "moved to heap: i$" + p := &i // ERROR "moved to heap: p$" + p2 := &p + sink = param9(&p2) +} + +// **in -> out +func param10(p ***int) *int { // ERROR "leaking param: p to result ~r1 level=2" + return **p +} + +func caller10a() { + i := 0 + p := &i + p2 := &p + _ = param10(&p2) +} + +func caller10b() { + i := 0 // ERROR "moved to heap: i$" + p := &i + p2 := &p + sink = param10(&p2) +} + +// in escapes to heap (address of param taken and returned) +func param11(i **int) ***int { // ERROR "moved to heap: i$" + return &i +} + +func caller11a() { + i := 0 // ERROR "moved to heap: i" + p := &i // ERROR "moved to heap: p" + _ = param11(&p) +} + +func caller11b() { + i := 0 // ERROR "moved to heap: i$" + p := &i // ERROR "moved to heap: p$" + sink = param11(&p) +} + +func caller11c() { // GOOD + i := 0 // ERROR "moved to heap: i$" + p := &i // ERROR "moved to heap: p" + sink = *param11(&p) +} + +func caller11d() { + i := 0 // ERROR "moved to heap: i$" + p := &i // ERROR "moved to heap: p" + p2 := &p + sink = param11(p2) +} + +// &in -> rcvr +type Indir struct { + p ***int +} + +func (r *Indir) param12(i **int) { // ERROR "r does not escape$" "moved to heap: i$" + r.p = &i +} + +func caller12a() { + i := 0 // ERROR "moved to heap: i$" + p := &i // ERROR "moved to heap: p$" + var r Indir + r.param12(&p) + _ = r +} + +func caller12b() { + i := 0 // ERROR "moved to heap: i$" + p := &i // ERROR "moved to heap: p$" + r := &Indir{} // ERROR "&Indir{} does not escape$" + r.param12(&p) + _ = r +} + +func caller12c() { + i := 0 // ERROR "moved to heap: i$" + p := &i // ERROR "moved to heap: p$" + r := Indir{} + r.param12(&p) + sink = r +} + +func caller12d() { + i := 0 // ERROR "moved to heap: i$" + p := &i // ERROR "moved to heap: p$" + r := Indir{} + r.param12(&p) + sink = **r.p +} + +// in -> value rcvr +type Val struct { + p **int +} + +func (v Val) param13(i *int) { // ERROR "v does not escape$" "leaking param: i$" + *v.p = i +} + +func caller13a() { + i := 0 // ERROR "moved to heap: i$" + var p *int + var v Val + v.p = &p + v.param13(&i) + _ = v +} + +func caller13b() { + i := 0 // ERROR "moved to heap: i$" + var p *int + v := Val{&p} + v.param13(&i) + _ = v +} + +func caller13c() { + i := 0 // ERROR "moved to heap: i$" + var p *int + v := &Val{&p} // ERROR "&Val{...} does not escape$" + v.param13(&i) + _ = v +} + +func caller13d() { + i := 0 // ERROR "moved to heap: i$" + var p *int // ERROR "moved to heap: p$" + var v Val + v.p = &p + v.param13(&i) + sink = v +} + +func caller13e() { + i := 0 // ERROR "moved to heap: i$" + var p *int // ERROR "moved to heap: p$" + v := Val{&p} + v.param13(&i) + sink = v +} + +func caller13f() { + i := 0 // ERROR "moved to heap: i$" + var p *int // ERROR "moved to heap: p$" + v := &Val{&p} // ERROR "&Val{...} escapes to heap$" + v.param13(&i) + sink = v +} + +func caller13g() { + i := 0 // ERROR "moved to heap: i$" + var p *int + v := Val{&p} + v.param13(&i) + sink = *v.p +} + +func caller13h() { + i := 0 // ERROR "moved to heap: i$" + var p *int + v := &Val{&p} // ERROR "&Val{...} does not escape$" + v.param13(&i) + sink = **v.p // ERROR "\* \(\*v\.p\) escapes to heap" +} + +type Node struct { + p *Node +} + +var Sink *Node + +func f(x *Node) { // ERROR "leaking param content: x" + Sink = &Node{x.p} // ERROR "&Node{...} escapes to heap" +} + +func g(x *Node) *Node { // ERROR "leaking param content: x" + return &Node{x.p} // ERROR "&Node{...} escapes to heap" +} + +func h(x *Node) { // ERROR "leaking param: x" + y := &Node{x} // ERROR "&Node{...} does not escape" + Sink = g(y) + f(y) +} + +// interface(in) -> out +// See also issue 29353. + +// Convert to a non-direct interface, require an allocation and +// copy x to heap (not to result). +func param14a(x [4]*int) interface{} { // ERROR "leaking param: x$" + return x // ERROR "x escapes to heap" +} + +// Convert to a direct interface, does not need an allocation. +// So x only leaks to result. +func param14b(x *int) interface{} { // ERROR "leaking param: x to result ~r1 level=0" + return x +} |