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Source file test/live.go

Documentation: test

     1  // errorcheckwithauto -0 -l -live -wb=0 -d=ssa/insert_resched_checks/off
     2  // +build !ppc64,!ppc64le
     3  // ppc64 needs a better tighten pass to make f18 pass
     4  // rescheduling checks need to be turned off because there are some live variables across the inserted check call
     5  
     6  // Copyright 2014 The Go Authors. All rights reserved.
     7  // Use of this source code is governed by a BSD-style
     8  // license that can be found in the LICENSE file.
     9  
    10  // liveness tests with inlining disabled.
    11  // see also live2.go.
    12  
    13  package main
    14  
    15  func printnl()
    16  
    17  //go:noescape
    18  func printpointer(**int)
    19  
    20  //go:noescape
    21  func printintpointer(*int)
    22  
    23  //go:noescape
    24  func printstringpointer(*string)
    25  
    26  //go:noescape
    27  func printstring(string)
    28  
    29  //go:noescape
    30  func printbytepointer(*byte)
    31  
    32  func printint(int)
    33  
    34  func f1() {
    35  	var x *int
    36  	printpointer(&x) // ERROR "live at call to printpointer: x$"
    37  	printpointer(&x) // ERROR "live at call to printpointer: x$"
    38  }
    39  
    40  func f2(b bool) {
    41  	if b {
    42  		printint(0) // nothing live here
    43  		return
    44  	}
    45  	var x *int
    46  	printpointer(&x) // ERROR "live at call to printpointer: x$"
    47  	printpointer(&x) // ERROR "live at call to printpointer: x$"
    48  }
    49  
    50  func f3(b1, b2 bool) {
    51  	// Here x and y are ambiguously live. In previous go versions they
    52  	// were marked as live throughout the function to avoid being
    53  	// poisoned in GODEBUG=gcdead=1 mode; this is now no longer the
    54  	// case.
    55  
    56  	printint(0)
    57  	if b1 == false {
    58  		printint(0)
    59  		return
    60  	}
    61  
    62  	if b2 {
    63  		var x *int
    64  		printpointer(&x) // ERROR "live at call to printpointer: x$"
    65  		printpointer(&x) // ERROR "live at call to printpointer: x$"
    66  	} else {
    67  		var y *int
    68  		printpointer(&y) // ERROR "live at call to printpointer: y$"
    69  		printpointer(&y) // ERROR "live at call to printpointer: y$"
    70  	}
    71  	printint(0) // ERROR "f3: x \(type \*int\) is ambiguously live$" "f3: y \(type \*int\) is ambiguously live$" "live at call to printint: x y$"
    72  }
    73  
    74  // The old algorithm treated x as live on all code that
    75  // could flow to a return statement, so it included the
    76  // function entry and code above the declaration of x
    77  // but would not include an indirect use of x in an infinite loop.
    78  // Check that these cases are handled correctly.
    79  
    80  func f4(b1, b2 bool) { // x not live here
    81  	if b2 {
    82  		printint(0) // x not live here
    83  		return
    84  	}
    85  	var z **int
    86  	x := new(int)
    87  	*x = 42
    88  	z = &x
    89  	printint(**z) // ERROR "live at call to printint: x$"
    90  	if b2 {
    91  		printint(1) // x not live here
    92  		return
    93  	}
    94  	for {
    95  		printint(**z) // ERROR "live at call to printint: x$"
    96  	}
    97  }
    98  
    99  func f5(b1 bool) {
   100  	var z **int
   101  	if b1 {
   102  		x := new(int)
   103  		*x = 42
   104  		z = &x
   105  	} else {
   106  		y := new(int)
   107  		*y = 54
   108  		z = &y
   109  	}
   110  	printint(**z) // ERROR "f5: x \(type \*int\) is ambiguously live$" "f5: y \(type \*int\) is ambiguously live$" "live at call to printint: x y$"
   111  }
   112  
   113  // confusion about the _ result used to cause spurious "live at entry to f6: _".
   114  
   115  func f6() (_, y string) {
   116  	y = "hello"
   117  	return
   118  }
   119  
   120  // confusion about addressed results used to cause "live at entry to f7: x".
   121  
   122  func f7() (x string) {
   123  	_ = &x
   124  	x = "hello"
   125  	return
   126  }
   127  
   128  // ignoring block returns used to cause "live at entry to f8: x, y".
   129  
   130  func f8() (x, y string) {
   131  	return g8()
   132  }
   133  
   134  func g8() (string, string)
   135  
   136  // ignoring block assignments used to cause "live at entry to f9: x"
   137  // issue 7205
   138  
   139  var i9 interface{}
   140  
   141  func f9() bool {
   142  	g8()
   143  	x := i9
   144  	y := interface{}(str()) // ERROR "live at call to convT2Estring: .autotmp_[0-9]+ x.data$" "live at call to str: x.data$"
   145  	i9 = y                  // make y escape so the line above has to call convT2E
   146  	return x != y
   147  }
   148  
   149  // liveness formerly confused by UNDEF followed by RET,
   150  // leading to "live at entry to f10: ~r1" (unnamed result).
   151  
   152  func f10() string {
   153  	panic(1)
   154  }
   155  
   156  // liveness formerly confused by select, thinking runtime.selectgo
   157  // can return to next instruction; it always jumps elsewhere.
   158  // note that you have to use at least two cases in the select
   159  // to get a true select; smaller selects compile to optimized helper functions.
   160  
   161  var c chan *int
   162  var b bool
   163  
   164  // this used to have a spurious "live at entry to f11a: ~r0"
   165  func f11a() *int {
   166  	select { // ERROR "live at call to selectgo: .autotmp_[0-9]+$"
   167  	case <-c:
   168  		return nil
   169  	case <-c:
   170  		return nil
   171  	}
   172  }
   173  
   174  func f11b() *int {
   175  	p := new(int)
   176  	if b {
   177  		// At this point p is dead: the code here cannot
   178  		// get to the bottom of the function.
   179  		// This used to have a spurious "live at call to printint: p".
   180  		printint(1) // nothing live here!
   181  		select {    // ERROR "live at call to selectgo: .autotmp_[0-9]+$"
   182  		case <-c:
   183  			return nil
   184  		case <-c:
   185  			return nil
   186  		}
   187  	}
   188  	println(*p)
   189  	return nil
   190  }
   191  
   192  var sink *int
   193  
   194  func f11c() *int {
   195  	p := new(int)
   196  	sink = p // prevent stack allocation, otherwise p is rematerializeable
   197  	if b {
   198  		// Unlike previous, the cases in this select fall through,
   199  		// so we can get to the println, so p is not dead.
   200  		printint(1) // ERROR "live at call to printint: p$"
   201  		select {    // ERROR "live at call to selectgo: .autotmp_[0-9]+ p$"
   202  		case <-c:
   203  		case <-c:
   204  		}
   205  	}
   206  	println(*p)
   207  	return nil
   208  }
   209  
   210  // similarly, select{} does not fall through.
   211  // this used to have a spurious "live at entry to f12: ~r0".
   212  
   213  func f12() *int {
   214  	if b {
   215  		select {}
   216  	} else {
   217  		return nil
   218  	}
   219  }
   220  
   221  // incorrectly placed VARDEF annotations can cause missing liveness annotations.
   222  // this used to be missing the fact that s is live during the call to g13 (because it is
   223  // needed for the call to h13).
   224  
   225  func f13() {
   226  	s := g14()
   227  	s = h13(s, g13(s)) // ERROR "live at call to g13: s.ptr$"
   228  }
   229  
   230  func g13(string) string
   231  func h13(string, string) string
   232  
   233  // more incorrectly placed VARDEF.
   234  
   235  func f14() {
   236  	x := g14()
   237  	printstringpointer(&x) // ERROR "live at call to printstringpointer: x$"
   238  }
   239  
   240  func g14() string
   241  
   242  // Checking that various temporaries do not persist or cause
   243  // ambiguously live values that must be zeroed.
   244  // The exact temporary names are inconsequential but we are
   245  // trying to check that there is only one at any given site,
   246  // and also that none show up in "ambiguously live" messages.
   247  
   248  var m map[string]int
   249  var mi map[interface{}]int
   250  
   251  // str and iface are used to ensure that a temp is required for runtime calls below.
   252  func str() string
   253  func iface() interface{}
   254  
   255  func f16() {
   256  	if b {
   257  		delete(mi, iface()) // ERROR "live at call to mapdelete: .autotmp_[0-9]+$"
   258  	}
   259  	delete(mi, iface()) // ERROR "live at call to mapdelete: .autotmp_[0-9]+$"
   260  	delete(mi, iface()) // ERROR "live at call to mapdelete: .autotmp_[0-9]+$"
   261  }
   262  
   263  var m2s map[string]*byte
   264  var m2 map[[2]string]*byte
   265  var x2 [2]string
   266  var bp *byte
   267  
   268  func f17a(p *byte) { // ERROR "live at entry to f17a: p$"
   269  	if b {
   270  		m2[x2] = p // ERROR "live at call to mapassign: p$"
   271  	}
   272  	m2[x2] = p // ERROR "live at call to mapassign: p$"
   273  	m2[x2] = p // ERROR "live at call to mapassign: p$"
   274  }
   275  
   276  func f17b(p *byte) { // ERROR "live at entry to f17b: p$"
   277  	// key temporary
   278  	if b {
   279  		m2s[str()] = p // ERROR "live at call to mapassign_faststr: p$" "live at call to str: p$"
   280  	}
   281  	m2s[str()] = p // ERROR "live at call to mapassign_faststr: p$" "live at call to str: p$"
   282  	m2s[str()] = p // ERROR "live at call to mapassign_faststr: p$" "live at call to str: p$"
   283  }
   284  
   285  func f17c() {
   286  	// key and value temporaries
   287  	if b {
   288  		m2s[str()] = f17d() // ERROR "live at call to f17d: .autotmp_[0-9]+$" "live at call to mapassign_faststr: .autotmp_[0-9]+$"
   289  	}
   290  	m2s[str()] = f17d() // ERROR "live at call to f17d: .autotmp_[0-9]+$" "live at call to mapassign_faststr: .autotmp_[0-9]+$"
   291  	m2s[str()] = f17d() // ERROR "live at call to f17d: .autotmp_[0-9]+$" "live at call to mapassign_faststr: .autotmp_[0-9]+$"
   292  }
   293  
   294  func f17d() *byte
   295  
   296  func g18() [2]string
   297  
   298  func f18() {
   299  	// key temporary for mapaccess.
   300  	// temporary introduced by orderexpr.
   301  	var z *byte
   302  	if b {
   303  		z = m2[g18()] // ERROR "live at call to mapaccess1: .autotmp_[0-9]+$"
   304  	}
   305  	z = m2[g18()] // ERROR "live at call to mapaccess1: .autotmp_[0-9]+$"
   306  	z = m2[g18()] // ERROR "live at call to mapaccess1: .autotmp_[0-9]+$"
   307  	printbytepointer(z)
   308  }
   309  
   310  var ch chan *byte
   311  
   312  // byteptr is used to ensure that a temp is required for runtime calls below.
   313  func byteptr() *byte
   314  
   315  func f19() {
   316  	// dest temporary for channel receive.
   317  	var z *byte
   318  
   319  	if b {
   320  		z = <-ch // ERROR "live at call to chanrecv1: .autotmp_[0-9]+$"
   321  	}
   322  	z = <-ch // ERROR "live at call to chanrecv1: .autotmp_[0-9]+$"
   323  	z = <-ch // ERROR "live at call to chanrecv1: .autotmp_[0-9]+$"
   324  	printbytepointer(z)
   325  }
   326  
   327  func f20() {
   328  	// src temporary for channel send
   329  	if b {
   330  		ch <- byteptr() // ERROR "live at call to chansend1: .autotmp_[0-9]+$"
   331  	}
   332  	ch <- byteptr() // ERROR "live at call to chansend1: .autotmp_[0-9]+$"
   333  	ch <- byteptr() // ERROR "live at call to chansend1: .autotmp_[0-9]+$"
   334  }
   335  
   336  func f21() {
   337  	// key temporary for mapaccess using array literal key.
   338  	var z *byte
   339  	if b {
   340  		z = m2[[2]string{"x", "y"}] // ERROR "live at call to mapaccess1: .autotmp_[0-9]+$"
   341  	}
   342  	z = m2[[2]string{"x", "y"}] // ERROR "live at call to mapaccess1: .autotmp_[0-9]+$"
   343  	z = m2[[2]string{"x", "y"}] // ERROR "live at call to mapaccess1: .autotmp_[0-9]+$"
   344  	printbytepointer(z)
   345  }
   346  
   347  func f23() {
   348  	// key temporary for two-result map access using array literal key.
   349  	var z *byte
   350  	var ok bool
   351  	if b {
   352  		z, ok = m2[[2]string{"x", "y"}] // ERROR "live at call to mapaccess2: .autotmp_[0-9]+$"
   353  	}
   354  	z, ok = m2[[2]string{"x", "y"}] // ERROR "live at call to mapaccess2: .autotmp_[0-9]+$"
   355  	z, ok = m2[[2]string{"x", "y"}] // ERROR "live at call to mapaccess2: .autotmp_[0-9]+$"
   356  	printbytepointer(z)
   357  	print(ok)
   358  }
   359  
   360  func f24() {
   361  	// key temporary for map access using array literal key.
   362  	// value temporary too.
   363  	if b {
   364  		m2[[2]string{"x", "y"}] = nil // ERROR "live at call to mapassign: .autotmp_[0-9]+$"
   365  	}
   366  	m2[[2]string{"x", "y"}] = nil // ERROR "live at call to mapassign: .autotmp_[0-9]+$"
   367  	m2[[2]string{"x", "y"}] = nil // ERROR "live at call to mapassign: .autotmp_[0-9]+$"
   368  }
   369  
   370  // defer should not cause spurious ambiguously live variables
   371  
   372  func f25(b bool) {
   373  	defer g25()
   374  	if b {
   375  		return
   376  	}
   377  	var x string
   378  	x = g14()
   379  	printstring(x)
   380  }
   381  
   382  func g25()
   383  
   384  // non-escaping ... slices passed to function call should die on return,
   385  // so that the temporaries do not stack and do not cause ambiguously
   386  // live variables.
   387  
   388  func f26(b bool) {
   389  	if b {
   390  		print26((*int)(nil), (*int)(nil), (*int)(nil)) // ERROR "live at call to print26: .autotmp_[0-9]+$"
   391  	}
   392  	print26((*int)(nil), (*int)(nil), (*int)(nil)) // ERROR "live at call to print26: .autotmp_[0-9]+$"
   393  	print26((*int)(nil), (*int)(nil), (*int)(nil)) // ERROR "live at call to print26: .autotmp_[0-9]+$"
   394  	printnl()
   395  }
   396  
   397  //go:noescape
   398  func print26(...interface{})
   399  
   400  // non-escaping closures passed to function call should die on return
   401  
   402  func f27(b bool) {
   403  	x := 0
   404  	if b {
   405  		call27(func() { x++ }) // ERROR "live at call to call27: .autotmp_[0-9]+$"
   406  	}
   407  	call27(func() { x++ }) // ERROR "live at call to call27: .autotmp_[0-9]+$"
   408  	call27(func() { x++ }) // ERROR "live at call to call27: .autotmp_[0-9]+$"
   409  	printnl()
   410  }
   411  
   412  // but defer does escape to later execution in the function
   413  
   414  func f27defer(b bool) {
   415  	x := 0
   416  	if b {
   417  		defer call27(func() { x++ }) // ERROR "live at call to deferproc: .autotmp_[0-9]+$" "live at call to deferreturn: .autotmp_[0-9]+$"
   418  	}
   419  	defer call27(func() { x++ }) // ERROR "f27defer: .autotmp_[0-9]+ \(type struct { F uintptr; x \*int }\) is ambiguously live$" "live at call to deferproc: .autotmp_[0-9]+ .autotmp_[0-9]+$" "live at call to deferreturn: .autotmp_[0-9]+ .autotmp_[0-9]+$"
   420  	printnl()                    // ERROR "live at call to printnl: .autotmp_[0-9]+ .autotmp_[0-9]+$"
   421  } // ERROR "live at call to deferreturn: .autotmp_[0-9]+ .autotmp_[0-9]+$"
   422  
   423  // and newproc (go) escapes to the heap
   424  
   425  func f27go(b bool) {
   426  	x := 0
   427  	if b {
   428  		go call27(func() { x++ }) // ERROR "live at call to newobject: &x$" "live at call to newproc: &x$"
   429  	}
   430  	go call27(func() { x++ }) // ERROR "live at call to newobject: &x$"
   431  	printnl()
   432  }
   433  
   434  //go:noescape
   435  func call27(func())
   436  
   437  // concatstring slice should die on return
   438  
   439  var s1, s2, s3, s4, s5, s6, s7, s8, s9, s10 string
   440  
   441  func f28(b bool) {
   442  	if b {
   443  		printstring(s1 + s2 + s3 + s4 + s5 + s6 + s7 + s8 + s9 + s10) // ERROR "live at call to concatstrings: .autotmp_[0-9]+$" "live at call to printstring: .autotmp_[0-9]+$"
   444  	}
   445  	printstring(s1 + s2 + s3 + s4 + s5 + s6 + s7 + s8 + s9 + s10) // ERROR "live at call to concatstrings: .autotmp_[0-9]+$" "live at call to printstring: .autotmp_[0-9]+$"
   446  	printstring(s1 + s2 + s3 + s4 + s5 + s6 + s7 + s8 + s9 + s10) // ERROR "live at call to concatstrings: .autotmp_[0-9]+$" "live at call to printstring: .autotmp_[0-9]+$"
   447  }
   448  
   449  // map iterator should die on end of range loop
   450  
   451  func f29(b bool) {
   452  	if b {
   453  		for k := range m { // ERROR "live at call to mapiterinit: .autotmp_[0-9]+$" "live at call to mapiternext: .autotmp_[0-9]+$"
   454  			printstring(k) // ERROR "live at call to printstring: .autotmp_[0-9]+$"
   455  		}
   456  	}
   457  	for k := range m { // ERROR "live at call to mapiterinit: .autotmp_[0-9]+$" "live at call to mapiternext: .autotmp_[0-9]+$"
   458  		printstring(k) // ERROR "live at call to printstring: .autotmp_[0-9]+$"
   459  	}
   460  	for k := range m { // ERROR "live at call to mapiterinit: .autotmp_[0-9]+$" "live at call to mapiternext: .autotmp_[0-9]+$"
   461  		printstring(k) // ERROR "live at call to printstring: .autotmp_[0-9]+$"
   462  	}
   463  }
   464  
   465  // copy of array of pointers should die at end of range loop
   466  var pstructarr [10]pstruct
   467  
   468  // Struct size choosen to make pointer to element in pstructarr
   469  // not computable by strength reduction.
   470  type pstruct struct {
   471  	intp *int
   472  	_    [8]byte
   473  }
   474  
   475  func f30(b bool) {
   476  	// two live temps during printintpointer(p):
   477  	// in the copy of p.intp and
   478  	// the internal iterator pointer if a pointer to pstruct in pstructarr
   479  	// can not be easily computed by strength reduction.
   480  	if b {
   481  		for _, p := range pstructarr {
   482  			printintpointer(p.intp) // ERROR "live at call to printintpointer: .autotmp_[0-9]+ .autotmp_[0-9]+$"
   483  		}
   484  	}
   485  	for _, p := range pstructarr {
   486  		printintpointer(p.intp) // ERROR "live at call to printintpointer: .autotmp_[0-9]+ .autotmp_[0-9]+$"
   487  	}
   488  	for _, p := range pstructarr {
   489  		printintpointer(p.intp) // ERROR "live at call to printintpointer: .autotmp_[0-9]+ .autotmp_[0-9]+$"
   490  	}
   491  }
   492  
   493  // conversion to interface should not leave temporary behind
   494  
   495  func f31(b1, b2, b3 bool) {
   496  	if b1 {
   497  		g31(str()) // ERROR "live at call to convT2Estring: .autotmp_[0-9]+$" "live at call to g31: .autotmp_[0-9]+$"
   498  	}
   499  	if b2 {
   500  		h31(str()) // ERROR "live at call to convT2Estring: .autotmp_[0-9]+ .autotmp_[0-9]+$" "live at call to h31: .autotmp_[0-9]+$" "live at call to newobject: .autotmp_[0-9]+$"
   501  	}
   502  	if b3 {
   503  		panic(str()) // ERROR "live at call to convT2Estring: .autotmp_[0-9]+$" "live at call to gopanic: .autotmp_[0-9]+$"
   504  	}
   505  	print(b3)
   506  }
   507  
   508  func g31(interface{})
   509  func h31(...interface{})
   510  
   511  // non-escaping partial functions passed to function call should die on return
   512  
   513  type T32 int
   514  
   515  func (t *T32) Inc() { // ERROR "live at entry to \(\*T32\).Inc: t$"
   516  	*t++
   517  }
   518  
   519  var t32 T32
   520  
   521  func f32(b bool) {
   522  	if b {
   523  		call32(t32.Inc) // ERROR "live at call to call32: .autotmp_[0-9]+$"
   524  	}
   525  	call32(t32.Inc) // ERROR "live at call to call32: .autotmp_[0-9]+$"
   526  	call32(t32.Inc) // ERROR "live at call to call32: .autotmp_[0-9]+$"
   527  }
   528  
   529  //go:noescape
   530  func call32(func())
   531  
   532  // temporaries introduced during if conditions and && || expressions
   533  // should die once the condition has been acted upon.
   534  
   535  var m33 map[interface{}]int
   536  
   537  func f33() {
   538  	if m33[byteptr()] == 0 { // ERROR "live at call to mapaccess1: .autotmp_[0-9]+$"
   539  		printnl()
   540  		return
   541  	} else {
   542  		printnl()
   543  	}
   544  	printnl()
   545  }
   546  
   547  func f34() {
   548  	if m33[byteptr()] == 0 { // ERROR "live at call to mapaccess1: .autotmp_[0-9]+$"
   549  		printnl()
   550  		return
   551  	}
   552  	printnl()
   553  }
   554  
   555  func f35() {
   556  	if m33[byteptr()] == 0 && m33[byteptr()] == 0 { // ERROR "live at call to mapaccess1: .autotmp_[0-9]+$" "f35: .autotmp_[0-9]+ \(type interface \{\}\) is ambiguously live$"
   557  		printnl()
   558  		return
   559  	}
   560  	printnl()
   561  }
   562  
   563  func f36() {
   564  	if m33[byteptr()] == 0 || m33[byteptr()] == 0 { // ERROR "live at call to mapaccess1: .autotmp_[0-9]+$" "f36: .autotmp_[0-9]+ \(type interface \{\}\) is ambiguously live$"
   565  		printnl()
   566  		return
   567  	}
   568  	printnl()
   569  }
   570  
   571  func f37() {
   572  	if (m33[byteptr()] == 0 || m33[byteptr()] == 0) && m33[byteptr()] == 0 { // ERROR "live at call to mapaccess1: .autotmp_[0-9]+$" "f37: .autotmp_[0-9]+ \(type interface \{\}\) is ambiguously live$"
   573  		printnl()
   574  		return
   575  	}
   576  	printnl()
   577  }
   578  
   579  // select temps should disappear in the case bodies
   580  
   581  var c38 chan string
   582  
   583  func fc38() chan string
   584  func fi38(int) *string
   585  func fb38() *bool
   586  
   587  func f38(b bool) {
   588  	// we don't care what temps are printed on the lines with output.
   589  	// we care that the println lines have no live variables
   590  	// and therefore no output.
   591  	if b {
   592  		select { // ERROR "live at call to selectgo:( .autotmp_[0-9]+)+$"
   593  		case <-fc38():
   594  			printnl()
   595  		case fc38() <- *fi38(1): // ERROR "live at call to fc38:( .autotmp_[0-9]+)+$" "live at call to fi38:( .autotmp_[0-9]+)+$"
   596  			printnl()
   597  		case *fi38(2) = <-fc38(): // ERROR "live at call to fc38:( .autotmp_[0-9]+)+$" "live at call to fi38:( .autotmp_[0-9]+)+$"
   598  			printnl()
   599  		case *fi38(3), *fb38() = <-fc38(): // ERROR "live at call to fb38:( .autotmp_[0-9]+)+$" "live at call to fc38:( .autotmp_[0-9]+)+$" "live at call to fi38:( .autotmp_[0-9]+)+$"
   600  			printnl()
   601  		}
   602  		printnl()
   603  	}
   604  	printnl()
   605  }
   606  
   607  // issue 8097: mishandling of x = x during return.
   608  
   609  func f39() (x []int) {
   610  	x = []int{1}
   611  	printnl() // ERROR "live at call to printnl: .autotmp_[0-9]+$"
   612  	return x
   613  }
   614  
   615  func f39a() (x []int) {
   616  	x = []int{1}
   617  	printnl() // ERROR "live at call to printnl: .autotmp_[0-9]+$"
   618  	return
   619  }
   620  
   621  func f39b() (x [10]*int) {
   622  	x = [10]*int{}
   623  	x[0] = new(int) // ERROR "live at call to newobject: x$"
   624  	printnl()       // ERROR "live at call to printnl: x$"
   625  	return x
   626  }
   627  
   628  func f39c() (x [10]*int) {
   629  	x = [10]*int{}
   630  	x[0] = new(int) // ERROR "live at call to newobject: x$"
   631  	printnl()       // ERROR "live at call to printnl: x$"
   632  	return
   633  }
   634  
   635  // issue 8142: lost 'addrtaken' bit on inlined variables.
   636  // no inlining in this test, so just checking that non-inlined works.
   637  
   638  type T40 struct {
   639  	m map[int]int
   640  }
   641  
   642  //go:noescape
   643  func useT40(*T40)
   644  
   645  func newT40() *T40 {
   646  	ret := T40{}
   647  	ret.m = make(map[int]int, 42) // ERROR "live at call to makemap: &ret$"
   648  	return &ret
   649  }
   650  
   651  func bad40() {
   652  	t := newT40()
   653  	_ = t
   654  	printnl()
   655  }
   656  
   657  func good40() {
   658  	ret := T40{}
   659  	ret.m = make(map[int]int) // ERROR "live at call to fastrand: .autotmp_[0-9]+ ret$"
   660  	t := &ret
   661  	printnl() // ERROR "live at call to printnl: .autotmp_[0-9]+ ret$"
   662  	useT40(t) // ERROR "live at call to useT40: .autotmp_[0-9]+ ret$"
   663  }
   664  
   665  func ddd1(x, y *int) { // ERROR "live at entry to ddd1: x y$"
   666  	ddd2(x, y) // ERROR "live at call to ddd2: .autotmp_[0-9]+$"
   667  	printnl()
   668  	// Note: no .?autotmp live at printnl.  See issue 16996.
   669  }
   670  func ddd2(a ...*int) { // ERROR "live at entry to ddd2: a$"
   671  	sink = a[0]
   672  }
   673  
   674  // issue 16016: autogenerated wrapper should have arguments live
   675  type T struct{}
   676  
   677  func (*T) Foo(ptr *int) {}
   678  
   679  type R struct{ *T } // ERRORAUTO "live at entry to \(\*R\)\.Foo: \.this ptr" "live at entry to R\.Foo: \.this ptr"
   680  
   681  // issue 18860: output arguments must be live all the time if there is a defer.
   682  // In particular, at printint r must be live.
   683  func f41(p, q *int) (r *int) { // ERROR "live at entry to f41: p q$"
   684  	r = p
   685  	defer func() { // ERROR "live at call to deferproc: q r$" "live at call to deferreturn: r$"
   686  		recover()
   687  	}()
   688  	printint(0) // ERROR "live at call to printint: q r$"
   689  	r = q
   690  	return // ERROR "live at call to deferreturn: r$"
   691  }
   692  

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