...
Run Format

Source file test/escape_param.go

Documentation: test

  // 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
  
  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) // ERROR "caller0a &i does not escape$"
  }
  
  func caller0b() {
  	i := 0            // ERROR "moved to heap: i$"
  	sink = param0(&i) // ERROR "&i escapes to heap$" "param0\(&i\) escapes to heap"
  }
  
  // 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$"
  	j := 0
  	sink, _ = param1(&i, &j) // ERROR "&i escapes to heap$" "caller1 &j does not escape$"
  }
  
  // in -> other in
  func param2(p1 *int, p2 **int) { // ERROR "leaking param: p1$" "param2 p2 does not escape$"
  	*p2 = p1
  }
  
  func caller2a() {
  	i := 0 // ERROR "moved to heap: i$"
  	var p *int
  	param2(&i, &p) // ERROR "&i escapes to heap$" "caller2a &p does not escape$"
  	_ = p
  }
  
  func caller2b() {
  	i := 0 // ERROR "moved to heap: i$"
  	var p *int
  	param2(&i, &p) // ERROR "&i escapes to heap$" "caller2b &p does not escape$"
  	sink = p       // ERROR "p escapes to heap$"
  }
  
  // in -> in
  type Pair struct {
  	p1 *int
  	p2 *int
  }
  
  func param3(p *Pair) { // ERROR "leaking param content: p$"
  	p.p1 = p.p2
  }
  
  func caller3a() {
  	i := 0            // ERROR "moved to heap: i$"
  	j := 0            // ERROR "moved to heap: j$"
  	p := Pair{&i, &j} // ERROR "&i escapes to heap$" "&j escapes to heap$"
  	param3(&p)        // ERROR "caller3a &p does not escape"
  	_ = p
  }
  
  func caller3b() {
  	i := 0            // ERROR "moved to heap: i$"
  	j := 0            // ERROR "moved to heap: j$"
  	p := Pair{&i, &j} // ERROR "&i escapes to heap$" "&j escapes to heap$"
  	param3(&p)        // ERROR "caller3b &p does not escape"
  	sink = p          // ERROR "p escapes to heap$"
  }
  
  // in -> rcvr
  func (p *Pair) param4(i *int) { // ERROR "\(\*Pair\).param4 p does not escape$" "leaking param: i$"
  	p.p1 = i
  }
  
  func caller4a() {
  	i := 0 // ERROR "moved to heap: i$"
  	p := Pair{}
  	p.param4(&i) // ERROR "&i escapes to heap$" "caller4a p does not escape$"
  	_ = p
  }
  
  func caller4b() {
  	i := 0 // ERROR "moved to heap: i$"
  	p := Pair{}
  	p.param4(&i) // ERROR "&i escapes to heap$" "caller4b p does not escape$"
  	sink = p     // ERROR "p escapes to heap$"
  }
  
  // in -> heap
  func param5(i *int) { // ERROR "leaking param: i$"
  	sink = i // ERROR "i escapes to heap$"
  }
  
  func caller5() {
  	i := 0     // ERROR "moved to heap: i$"
  	param5(&i) // ERROR "&i escapes to heap$"
  }
  
  // *in -> heap
  func param6(i ***int) { // ERROR "leaking param content: i$"
  	sink = *i // ERROR "\*i escapes to heap$"
  }
  
  func caller6a() {
  	i := 0      // ERROR "moved to heap: i$"
  	p := &i     // ERROR "&i escapes to heap$" "moved to heap: p$"
  	p2 := &p    // ERROR "&p escapes to heap$"
  	param6(&p2) // ERROR "caller6a &p2 does not escape"
  }
  
  // **in -> heap
  func param7(i ***int) { // ERROR "leaking param content: i$"
  	sink = **i // ERROR "\* \(\*i\) escapes to heap"
  }
  
  func caller7() {
  	i := 0      // ERROR "moved to heap: i$"
  	p := &i     // ERROR "&i escapes to heap$" "moved to heap: p$"
  	p2 := &p    // ERROR "&p escapes to heap$"
  	param7(&p2) // ERROR "caller7 &p2 does not escape"
  }
  
  // **in -> heap
  func param8(i **int) { // ERROR "param8 i does not escape$"
  	sink = **i // ERROR "\* \(\*i\) escapes to heap"
  }
  
  func caller8() {
  	i := 0
  	p := &i    // ERROR "caller8 &i does not escape$"
  	param8(&p) // ERROR "caller8 &p does not escape$"
  }
  
  // *in -> out
  func param9(p ***int) **int { // ERROR "leaking param: p to result ~r1 level=1"
  	return *p
  }
  
  func caller9a() {
  	i := 0
  	p := &i         // ERROR "caller9a &i does not escape"
  	p2 := &p        // ERROR "caller9a &p does not escape"
  	_ = param9(&p2) // ERROR "caller9a &p2 does not escape$"
  }
  
  func caller9b() {
  	i := 0             // ERROR "moved to heap: i$"
  	p := &i            // ERROR "&i escapes to heap$" "moved to heap: p$"
  	p2 := &p           // ERROR "&p escapes to heap$"
  	sink = param9(&p2) // ERROR "caller9b &p2 does not escape$"  "param9\(&p2\) escapes to heap"
  }
  
  // **in -> out
  func param10(p ***int) *int { // ERROR "leaking param: p to result ~r1 level=2"
  	return **p
  }
  
  func caller10a() {
  	i := 0
  	p := &i          // ERROR "caller10a &i does not escape"
  	p2 := &p         // ERROR "caller10a &p does not escape"
  	_ = param10(&p2) // ERROR "caller10a &p2 does not escape$"
  }
  
  func caller10b() {
  	i := 0              // ERROR "moved to heap: i$"
  	p := &i             // ERROR "&i escapes to heap$"
  	p2 := &p            // ERROR "caller10b &p does not escape$"
  	sink = param10(&p2) // ERROR "caller10b &p2 does not escape$" "param10\(&p2\) escapes to heap"
  }
  
  // in escapes to heap (address of param taken and returned)
  func param11(i **int) ***int { // ERROR "moved to heap: i$"
  	return &i // ERROR "&i escapes to heap$"
  }
  
  func caller11a() {
  	i := 0          // ERROR "moved to heap: i"
  	p := &i         // ERROR "moved to heap: p" "&i escapes to heap"
  	_ = param11(&p) // ERROR "&p escapes to heap"
  }
  
  func caller11b() {
  	i := 0             // ERROR "moved to heap: i$"
  	p := &i            // ERROR "&i escapes to heap$" "moved to heap: p$"
  	sink = param11(&p) // ERROR "&p escapes to heap$" "param11\(&p\) escapes to heap"
  }
  
  func caller11c() { // GOOD
  	i := 0              // ERROR "moved to heap: i$"
  	p := &i             // ERROR "moved to heap: p" "&i escapes to heap"
  	sink = *param11(&p) // ERROR "&p escapes to heap" "\*param11\(&p\) escapes to heap"
  }
  
  func caller11d() {
  	i := 0             // ERROR "moved to heap: i$"
  	p := &i            // ERROR "&i escapes to heap" "moved to heap: p"
  	p2 := &p           // ERROR "&p escapes to heap"
  	sink = param11(p2) // ERROR "param11\(p2\) escapes to heap"
  }
  
  // &in -> rcvr
  type Indir struct {
  	p ***int
  }
  
  func (r *Indir) param12(i **int) { // ERROR "\(\*Indir\).param12 r does not escape$" "moved to heap: i$"
  	r.p = &i // ERROR "&i escapes to heap$"
  }
  
  func caller12a() {
  	i := 0  // ERROR "moved to heap: i$"
  	p := &i // ERROR "&i escapes to heap$" "moved to heap: p$"
  	var r Indir
  	r.param12(&p) // ERROR "&p escapes to heap$" "caller12a r does not escape$"
  	_ = r
  }
  
  func caller12b() {
  	i := 0        // ERROR "moved to heap: i$"
  	p := &i       // ERROR "&i escapes to heap$" "moved to heap: p$"
  	r := &Indir{} // ERROR "caller12b &Indir literal does not escape$"
  	r.param12(&p) // ERROR "&p escapes to heap$"
  	_ = r
  }
  
  func caller12c() {
  	i := 0  // ERROR "moved to heap: i$"
  	p := &i // ERROR "&i escapes to heap$" "moved to heap: p$"
  	r := Indir{}
  	r.param12(&p) // ERROR "&p escapes to heap$" "caller12c r does not escape$"
  	sink = r      // ERROR "r escapes to heap$"
  }
  
  func caller12d() {
  	i := 0  // ERROR "moved to heap: i$"
  	p := &i // ERROR "&i escapes to heap$" "moved to heap: p$"
  	r := Indir{}
  	r.param12(&p) // ERROR "&p escapes to heap$" "caller12d r does not escape$"
  	sink = **r.p  // ERROR "\* \(\*r\.p\) escapes to heap"
  }
  
  // in -> value rcvr
  type Val struct {
  	p **int
  }
  
  func (v Val) param13(i *int) { // ERROR "Val.param13 v does not escape$" "leaking param: i$"
  	*v.p = i
  }
  
  func caller13a() {
  	i := 0 // ERROR "moved to heap: i$"
  	var p *int
  	var v Val
  	v.p = &p      // ERROR "caller13a &p does not escape$"
  	v.param13(&i) // ERROR "&i escapes to heap$"
  	_ = v
  }
  
  func caller13b() {
  	i := 0 // ERROR "moved to heap: i$"
  	var p *int
  	v := Val{&p}  // ERROR "caller13b &p does not escape$"
  	v.param13(&i) // ERROR "&i escapes to heap$"
  	_ = v
  }
  
  func caller13c() {
  	i := 0 // ERROR "moved to heap: i$"
  	var p *int
  	v := &Val{&p} // ERROR "caller13c &Val literal does not escape$" "caller13c &p does not escape$"
  	v.param13(&i) // ERROR "&i escapes to heap$"
  	_ = v
  }
  
  func caller13d() {
  	i := 0     // ERROR "moved to heap: i$"
  	var p *int // ERROR "moved to heap: p$"
  	var v Val
  	v.p = &p      // ERROR "&p escapes to heap$"
  	v.param13(&i) // ERROR "&i escapes to heap$"
  	sink = v      // ERROR "v escapes to heap$"
  }
  
  func caller13e() {
  	i := 0        // ERROR "moved to heap: i$"
  	var p *int    // ERROR "moved to heap: p$"
  	v := Val{&p}  // ERROR "&p escapes to heap$"
  	v.param13(&i) // ERROR "&i escapes to heap$"
  	sink = v      // ERROR "v escapes to heap$"
  }
  
  func caller13f() {
  	i := 0        // ERROR "moved to heap: i$"
  	var p *int    // ERROR "moved to heap: p$"
  	v := &Val{&p} // ERROR "&Val literal escapes to heap$" "&p escapes to heap$"
  	v.param13(&i) // ERROR "&i escapes to heap$"
  	sink = v      // ERROR "v escapes to heap$"
  }
  
  func caller13g() {
  	i := 0 // ERROR "moved to heap: i$"
  	var p *int
  	v := Val{&p}  // ERROR "caller13g &p does not escape$"
  	v.param13(&i) // ERROR "&i escapes to heap$"
  	sink = *v.p   // ERROR "\*v\.p escapes to heap"
  }
  
  func caller13h() {
  	i := 0 // ERROR "moved to heap: i$"
  	var p *int
  	v := &Val{&p} // ERROR "caller13h &Val literal does not escape$" "caller13h &p does not escape$"
  	v.param13(&i) // ERROR "&i escapes to heap$"
  	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 literal escapes to heap"
  }
  
  func g(x *Node) *Node { // ERROR "leaking param: x to result ~r1 level=0"
  	return &Node{x.p} // ERROR "&Node literal escapes to heap"
  }
  
  func h(x *Node) { // ERROR "leaking param: x"
  	y := &Node{x} // ERROR "h &Node literal does not escape"
  	Sink = g(y)
  	f(y)
  }
  

View as plain text