PNG  IHDRxsBIT|d pHYs+tEXtSoftwarewww.inkscape.org<,tEXtComment File Manager

File Manager

Path: /opt/golang/1.22.0/test/

Viewing File: 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)
}
b IDATxytVսϓ22 A@IR :hCiZ[v*E:WũZA ^dQeQ @ !jZ'>gsV仿$|?g)&x-EIENT ;@xT.i%-X}SvS5.r/UHz^_$-W"w)Ɗ/@Z &IoX P$K}JzX:;` &, ŋui,e6mX ԵrKb1ԗ)DADADADADADADADADADADADADADADADADADADADADADADADADADADADADADADADADADADADADADADADADADA݀!I*]R;I2$eZ#ORZSrr6mteffu*((Pu'v{DIߔ4^pIm'77WEEE;vƎ4-$]'RI{\I&G :IHJ DWBB=\WR޽m o$K(V9ABB.}jѢv`^?IOȅ} ڶmG}T#FJ`56$-ھ}FI&v;0(h;Б38CӧOWf!;A i:F_m9s&|q%=#wZprrrla A &P\\СC[A#! {olF} `E2}MK/vV)i{4BffV\|ۭX`b@kɶ@%i$K z5zhmX[IXZ` 'b%$r5M4º/l ԃߖxhʔ)[@=} K6IM}^5k㏷݆z ΗÿO:gdGBmyT/@+Vɶ纽z񕏵l.y޴it뭷zV0[Y^>Wsqs}\/@$(T7f.InݺiR$푔n.~?H))\ZRW'Mo~v Ov6oԃxz! S,&xm/yɞԟ?'uaSѽb,8GלKboi&3t7Y,)JJ c[nzӳdE&KsZLӄ I?@&%ӟ۶mSMMњ0iؐSZ,|J+N ~,0A0!5%Q-YQQa3}$_vVrf9f?S8`zDADADADADADADADADAdqP,تmMmg1V?rSI꒟]u|l RCyEf٢9 jURbztѰ!m5~tGj2DhG*{H9)꒟ר3:(+3\?/;TUݭʴ~S6lڧUJ*i$d(#=Yݺd{,p|3B))q:vN0Y.jkק6;SɶVzHJJЀ-utѹսk>QUU\޲~]fFnK?&ߡ5b=z9)^|u_k-[y%ZNU6 7Mi:]ۦtk[n X(e6Bb."8cۭ|~teuuw|ήI-5"~Uk;ZicEmN/:]M> cQ^uiƞ??Ңpc#TUU3UakNwA`:Y_V-8.KKfRitv޲* 9S6ֿj,ՃNOMߤ]z^fOh|<>@Å5 _/Iu?{SY4hK/2]4%it5q]GGe2%iR| W&f*^]??vq[LgE_3f}Fxu~}qd-ږFxu~I N>\;͗O֊:̗WJ@BhW=y|GgwܷH_NY?)Tdi'?խwhlmQi !SUUsw4kӺe4rfxu-[nHtMFj}H_u~w>)oV}(T'ebʒv3_[+vn@Ȭ\S}ot}w=kHFnxg S 0eޢm~l}uqZfFoZuuEg `zt~? b;t%>WTkķh[2eG8LIWx,^\thrl^Ϊ{=dž<}qV@ ⠨Wy^LF_>0UkDuʫuCs$)Iv:IK;6ֲ4{^6եm+l3>݆uM 9u?>Zc }g~qhKwڭeFMM~pМuqǿz6Tb@8@Y|jx](^]gf}M"tG -w.@vOqh~/HII`S[l.6nØXL9vUcOoB\xoǤ'T&IǍQw_wpv[kmO{w~>#=P1Pɞa-we:iǏlHo׈꒟f9SzH?+shk%Fs:qVhqY`jvO'ρ?PyX3lх]˾uV{ݞ]1,MzYNW~̈́ joYn}ȚF߾׮mS]F z+EDxm/d{F{-W-4wY듏:??_gPf ^3ecg ҵs8R2מz@TANGj)}CNi/R~}c:5{!ZHӋӾ6}T]G]7W6^n 9*,YqOZj:P?Q DFL|?-^.Ɵ7}fFh׶xe2Pscz1&5\cn[=Vn[ĶE鎀uˌd3GII k;lNmشOuuRVfBE]ۣeӶu :X-[(er4~LHi6:Ѻ@ԅrST0trk%$Č0ez" *z"T/X9|8.C5Feg}CQ%͞ˣJvL/?j^h&9xF`њZ(&yF&Iݻfg#W;3^{Wo^4'vV[[K';+mӍִ]AC@W?1^{එyh +^]fm~iԵ]AB@WTk̏t uR?l.OIHiYyԶ]Aˀ7c:q}ힽaf6Z~қm(+sK4{^6}T*UUu]n.:kx{:2 _m=sAߤU@?Z-Vކеz왍Nэ{|5 pڶn b p-@sPg]0G7fy-M{GCF'%{4`=$-Ge\ eU:m+Zt'WjO!OAF@ik&t݆ϥ_ e}=]"Wz_.͜E3leWFih|t-wZۍ-uw=6YN{6|} |*={Ѽn.S.z1zjۻTH]흾 DuDvmvK.`V]yY~sI@t?/ϓ. m&["+P?MzovVЫG3-GRR[(!!\_,^%?v@ҵő m`Y)tem8GMx.))A]Y i`ViW`?^~!S#^+ѽGZj?Vģ0.))A꨷lzL*]OXrY`DBBLOj{-MH'ii-ϰ ok7^ )쭡b]UXSְmռY|5*cֽk0B7镹%ڽP#8nȎq}mJr23_>lE5$iwui+ H~F`IjƵ@q \ @#qG0".0" l`„.0! ,AQHN6qzkKJ#o;`Xv2>,tێJJ7Z/*A .@fفjMzkg @TvZH3Zxu6Ra'%O?/dQ5xYkU]Rֽkق@DaS^RSּ5|BeHNN͘p HvcYcC5:y #`οb;z2.!kr}gUWkyZn=f Pvsn3p~;4p˚=ē~NmI] ¾ 0lH[_L hsh_ғߤc_њec)g7VIZ5yrgk̞W#IjӪv>՞y睝M8[|]\շ8M6%|@PZڨI-m>=k='aiRo-x?>Q.}`Ȏ:Wsmu u > .@,&;+!!˱tﭧDQwRW\vF\~Q7>spYw$%A~;~}6¾ g&if_=j,v+UL1(tWake:@Ș>j$Gq2t7S?vL|]u/ .(0E6Mk6hiۺzښOrifޱxm/Gx> Lal%%~{lBsR4*}{0Z/tNIɚpV^#Lf:u@k#RSu =S^ZyuR/.@n&΃z~B=0eg뺆#,Þ[B/?H uUf7y Wy}Bwegל`Wh(||`l`.;Ws?V@"c:iɍL֯PGv6zctM̠':wuW;d=;EveD}9J@B(0iհ bvP1{\P&G7D޴Iy_$-Qjm~Yrr&]CDv%bh|Yzni_ˆR;kg}nJOIIwyuL}{ЌNj}:+3Y?:WJ/N+Rzd=hb;dj͒suݔ@NKMԄ jqzC5@y°hL m;*5ezᕏ=ep XL n?מ:r`۵tŤZ|1v`V뽧_csج'ߤ%oTuumk%%%h)uy]Nk[n 'b2 l.=͜E%gf$[c;s:V-͞WߤWh-j7]4=F-X]>ZLSi[Y*We;Zan(ӇW|e(HNNP5[= r4tP &0<pc#`vTNV GFqvTi*Tyam$ߏWyE*VJKMTfFw>'$-ؽ.Ho.8c"@DADADADADADADADADA~j*֘,N;Pi3599h=goضLgiJ5փy~}&Zd9p֚ e:|hL``b/d9p? fgg+%%hMgXosج, ΩOl0Zh=xdjLmhݻoO[g_l,8a]٭+ӧ0$I]c]:粹:Teꢢ"5a^Kgh,&= =՟^߶“ߢE ܹS J}I%:8 IDAT~,9/ʃPW'Mo}zNƍ쨓zPbNZ~^z=4mswg;5 Y~SVMRXUյڱRf?s:w ;6H:ºi5-maM&O3;1IKeamZh͛7+##v+c ~u~ca]GnF'ټL~PPPbn voC4R,ӟgg %hq}@#M4IÇ Oy^xMZx ) yOw@HkN˖-Sǎmb]X@n+i͖!++K3gd\$mt$^YfJ\8PRF)77Wא!Cl$i:@@_oG I{$# 8磌ŋ91A (Im7֭>}ߴJq7ޗt^ -[ԩSj*}%]&' -ɓ'ꫯVzzvB#;a 7@GxI{j޼ƌ.LÇWBB7`O"I$/@R @eee@۷>}0,ɒ2$53Xs|cS~rpTYYY} kHc %&k.], @ADADADADADADADADA@lT<%''*Lo^={رc5h %$+CnܸQ3fҥK}vUVVs9G R,_{xˇ3o߾;TTTd}馛]uuuG~iԩ@4bnvmvfϞ /Peeeq}}za I~,誫{UWW뮻}_~YƍSMMMYχ֝waw\ďcxꩧtEƍկ_?۷5@u?1kNׯWzz/wy>}zj3 k(ٺuq_Zvf̘:~ ABQ&r|!%KҥKgԞ={<_X-z !CyFUUz~ ABQIIIjݺW$UXXDٳZ~ ABQƍecW$<(~<RSSvZujjjԧOZQu@4 8m&&&jԩg$ď1h ͟?_{768@g =@`)))5o6m3)ѣƌJ;wҿUTT /KZR{~a=@0o<*狔iFɶ[ˎ;T]]OX@?K.ۈxN pppppppppppppppppPfl߾] ,{ァk۶mڿo5BTӦMӴiӴ|r DB2e|An!Dy'tkΝ[A $***t5' "!駟oaDnΝ:t֭[gDШQ06qD;@ x M6v(PiizmZ4ew"@̴ixf [~-Fٱc&IZ2|n!?$@{[HTɏ#@hȎI# _m(F /6Z3z'\r,r!;w2Z3j=~GY7"I$iI.p_"?pN`y DD?: _  Gÿab7J !Bx@0 Bo cG@`1C[@0G @`0C_u V1 aCX>W ` | `!<S `"<. `#c`?cAC4 ?c p#~@0?:08&_MQ1J h#?/`7;I  q 7a wQ A 1 Hp !#<8/#@1Ul7=S=K.4Z?E_$i@!1!E4?`P_  @Bă10#: "aU,xbFY1 [n|n #'vEH:`xb #vD4Y hi.i&EΖv#O H4IŶ}:Ikh @tZRF#(tXҙzZ ?I3l7q@õ|ۍ1,GpuY Ꮿ@hJv#xxk$ v#9 5 }_$c S#=+"K{F*m7`#%H:NRSp6I?sIՖ{Ap$I$I:QRv2$Z @UJ*$]<FO4IENDB`