go escape_struct_param2 源码

golang escape_struct_param2 代码

文件路径：/test/escape_struct_param2.go

// 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_param1 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=0$"
	return u._sp
}

func (u U) SPP() **string { // ERROR "leaking param: u to result ~r0 level=0$"
	return u._spp
}

func (u U) SPPi() *string { // ERROR "leaking param: u to result ~r0 level=1$"
	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 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=0$"
	return v._u
}

func (v V) UP() *U { // ERROR "leaking param: v to result ~r0 level=0$"
	return v._up
}

func (v V) UPP() **U { // ERROR "leaking param: v to result ~r0 level=0$"
	return v._upp
}

func (v V) UPPia() *U { // ERROR "leaking param: v to result ~r0 level=1$"
	return *v._upp
}

func (v V) UPPib() *U { // ERROR "leaking param: v to result ~r0 level=1$"
	return *v.UPP()
}

func (v V) USPa() *string { // ERROR "leaking param: v to result ~r0 level=0$"
	return v._u._sp
}

func (v V) USPb() *string { // ERROR "leaking param: v to result ~r0 level=0$"
	return v.u()._sp
}

func (v V) USPPia() *string { // ERROR "leaking param: v to result ~r0 level=1$"
	return *v._u._spp
}

func (v V) USPPib() *string { // ERROR "leaking param: v to result ~r0 level=1$"
	return v._u.SPPi()
}

func (v V) UPiSPa() *string { // ERROR "leaking param: v to result ~r0 level=1$"
	return v._up._sp
}

func (v V) UPiSPb() *string { // ERROR "leaking param: v to result ~r0 level=1$"
	return v._up.SP()
}

func (v V) UPiSPc() *string { // ERROR "leaking param: v to result ~r0 level=1$"
	return v.UP()._sp
}

func (v V) UPiSPd() *string { // ERROR "leaking param: v to result ~r0 level=1$"
	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=3$"
	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() { // This test is sensitive to the level cap in function summary results.
	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)
}

相关信息

go 源码目录

相关文章

go 235 源码

go 64bit 源码

go alg 源码

go alias 源码

go alias1 源码

go alias2 源码

go alias3 源码

go align 源码

go append 源码

go append1 源码