diff options
Diffstat (limited to 'test/live.go')
| -rw-r--r-- | test/live.go | 722 |
1 files changed, 722 insertions, 0 deletions
diff --git a/test/live.go b/test/live.go new file mode 100644 index 0000000..3df7ab0 --- /dev/null +++ b/test/live.go @@ -0,0 +1,722 @@ +// errorcheckwithauto -0 -l -live -wb=0 -d=ssa/insert_resched_checks/off +// +build !ppc64,!ppc64le + +// ppc64 needs a better tighten pass to make f18 pass +// rescheduling checks need to be turned off because there are some live variables across the inserted check call + +// Copyright 2014 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. + +// liveness tests with inlining disabled. +// see also live2.go. + +package main + +func printnl() + +//go:noescape +func printpointer(**int) + +//go:noescape +func printintpointer(*int) + +//go:noescape +func printstringpointer(*string) + +//go:noescape +func printstring(string) + +//go:noescape +func printbytepointer(*byte) + +func printint(int) + +func f1() { + var x *int // ERROR "stack object x \*int$" + printpointer(&x) // ERROR "live at call to printpointer: x$" + printpointer(&x) +} + +func f2(b bool) { + if b { + printint(0) // nothing live here + return + } + var x *int // ERROR "stack object x \*int$" + printpointer(&x) // ERROR "live at call to printpointer: x$" + printpointer(&x) +} + +func f3(b1, b2 bool) { + // Here x and y are ambiguously live. In previous go versions they + // were marked as live throughout the function to avoid being + // poisoned in GODEBUG=gcdead=1 mode; this is now no longer the + // case. + + printint(0) + if b1 == false { + printint(0) + return + } + + if b2 { + var x *int // ERROR "stack object x \*int$" + printpointer(&x) // ERROR "live at call to printpointer: x$" + printpointer(&x) + } else { + var y *int // ERROR "stack object y \*int$" + printpointer(&y) // ERROR "live at call to printpointer: y$" + printpointer(&y) + } + printint(0) // nothing is live here +} + +// The old algorithm treated x as live on all code that +// could flow to a return statement, so it included the +// function entry and code above the declaration of x +// but would not include an indirect use of x in an infinite loop. +// Check that these cases are handled correctly. + +func f4(b1, b2 bool) { // x not live here + if b2 { + printint(0) // x not live here + return + } + var z **int + x := new(int) // ERROR "stack object x \*int$" + *x = 42 + z = &x + printint(**z) // ERROR "live at call to printint: x$" + if b2 { + printint(1) // x not live here + return + } + for { + printint(**z) // ERROR "live at call to printint: x$" + } +} + +func f5(b1 bool) { + var z **int + if b1 { + x := new(int) // ERROR "stack object x \*int$" + *x = 42 + z = &x + } else { + y := new(int) // ERROR "stack object y \*int$" + *y = 54 + z = &y + } + printint(**z) // nothing live here +} + +// confusion about the _ result used to cause spurious "live at entry to f6: _". + +func f6() (_, y string) { + y = "hello" + return +} + +// confusion about addressed results used to cause "live at entry to f7: x". + +func f7() (x string) { // ERROR "stack object x string" + _ = &x + x = "hello" + return +} + +// ignoring block returns used to cause "live at entry to f8: x, y". + +func f8() (x, y string) { + return g8() +} + +func g8() (string, string) + +// ignoring block assignments used to cause "live at entry to f9: x" +// issue 7205 + +var i9 interface{} + +func f9() bool { + g8() + x := i9 + y := interface{}(g18()) // ERROR "live at call to convT2E: x.data$" "live at call to g18: x.data$" "stack object .autotmp_[0-9]+ \[2\]string$" + i9 = y // make y escape so the line above has to call convT2E + return x != y +} + +// liveness formerly confused by UNDEF followed by RET, +// leading to "live at entry to f10: ~r1" (unnamed result). + +func f10() string { + panic(1) +} + +// liveness formerly confused by select, thinking runtime.selectgo +// can return to next instruction; it always jumps elsewhere. +// note that you have to use at least two cases in the select +// to get a true select; smaller selects compile to optimized helper functions. + +var c chan *int +var b bool + +// this used to have a spurious "live at entry to f11a: ~r0" +func f11a() *int { + select { // ERROR "stack object .autotmp_[0-9]+ \[2\]struct" + case <-c: + return nil + case <-c: + return nil + } +} + +func f11b() *int { + p := new(int) + if b { + // At this point p is dead: the code here cannot + // get to the bottom of the function. + // This used to have a spurious "live at call to printint: p". + printint(1) // nothing live here! + select { // ERROR "stack object .autotmp_[0-9]+ \[2\]struct" + case <-c: + return nil + case <-c: + return nil + } + } + println(*p) + return nil +} + +var sink *int + +func f11c() *int { + p := new(int) + sink = p // prevent stack allocation, otherwise p is rematerializeable + if b { + // Unlike previous, the cases in this select fall through, + // so we can get to the println, so p is not dead. + printint(1) // ERROR "live at call to printint: p$" + select { // ERROR "live at call to selectgo: p$" "stack object .autotmp_[0-9]+ \[2\]struct" + case <-c: + case <-c: + } + } + println(*p) + return nil +} + +// similarly, select{} does not fall through. +// this used to have a spurious "live at entry to f12: ~r0". + +func f12() *int { + if b { + select {} + } else { + return nil + } +} + +// incorrectly placed VARDEF annotations can cause missing liveness annotations. +// this used to be missing the fact that s is live during the call to g13 (because it is +// needed for the call to h13). + +func f13() { + s := g14() + s = h13(s, g13(s)) // ERROR "live at call to g13: s.ptr$" +} + +func g13(string) string +func h13(string, string) string + +// more incorrectly placed VARDEF. + +func f14() { + x := g14() // ERROR "stack object x string$" + printstringpointer(&x) +} + +func g14() string + +// Checking that various temporaries do not persist or cause +// ambiguously live values that must be zeroed. +// The exact temporary names are inconsequential but we are +// trying to check that there is only one at any given site, +// and also that none show up in "ambiguously live" messages. + +var m map[string]int +var mi map[interface{}]int + +// str and iface are used to ensure that a temp is required for runtime calls below. +func str() string +func iface() interface{} + +func f16() { + if b { + delete(mi, iface()) // ERROR "stack object .autotmp_[0-9]+ interface \{\}$" + } + delete(mi, iface()) + delete(mi, iface()) +} + +var m2s map[string]*byte +var m2 map[[2]string]*byte +var x2 [2]string +var bp *byte + +func f17a(p *byte) { // ERROR "live at entry to f17a: p$" + if b { + m2[x2] = p // ERROR "live at call to mapassign: p$" + } + m2[x2] = p // ERROR "live at call to mapassign: p$" + m2[x2] = p // ERROR "live at call to mapassign: p$" +} + +func f17b(p *byte) { // ERROR "live at entry to f17b: p$" + // key temporary + if b { + m2s[str()] = p // ERROR "live at call to mapassign_faststr: p$" "live at call to str: p$" + } + m2s[str()] = p // ERROR "live at call to mapassign_faststr: p$" "live at call to str: p$" + m2s[str()] = p // ERROR "live at call to mapassign_faststr: p$" "live at call to str: p$" +} + +func f17c() { + // key and value temporaries + if b { + m2s[str()] = f17d() // ERROR "live at call to f17d: .autotmp_[0-9]+$" "live at call to mapassign_faststr: .autotmp_[0-9]+$" + } + m2s[str()] = f17d() // ERROR "live at call to f17d: .autotmp_[0-9]+$" "live at call to mapassign_faststr: .autotmp_[0-9]+$" + m2s[str()] = f17d() // ERROR "live at call to f17d: .autotmp_[0-9]+$" "live at call to mapassign_faststr: .autotmp_[0-9]+$" +} + +func f17d() *byte + +func g18() [2]string + +func f18() { + // key temporary for mapaccess. + // temporary introduced by orderexpr. + var z *byte + if b { + z = m2[g18()] // ERROR "stack object .autotmp_[0-9]+ \[2\]string$" + } + z = m2[g18()] + z = m2[g18()] + printbytepointer(z) +} + +var ch chan *byte + +// byteptr is used to ensure that a temp is required for runtime calls below. +func byteptr() *byte + +func f19() { + // dest temporary for channel receive. + var z *byte + + if b { + z = <-ch // ERROR "stack object .autotmp_[0-9]+ \*byte$" + } + z = <-ch + z = <-ch // ERROR "live at call to chanrecv1: .autotmp_[0-9]+$" + printbytepointer(z) +} + +func f20() { + // src temporary for channel send + if b { + ch <- byteptr() // ERROR "stack object .autotmp_[0-9]+ \*byte$" + } + ch <- byteptr() + ch <- byteptr() +} + +func f21() { + // key temporary for mapaccess using array literal key. + var z *byte + if b { + z = m2[[2]string{"x", "y"}] // ERROR "stack object .autotmp_[0-9]+ \[2\]string$" + } + z = m2[[2]string{"x", "y"}] + z = m2[[2]string{"x", "y"}] + printbytepointer(z) +} + +func f23() { + // key temporary for two-result map access using array literal key. + var z *byte + var ok bool + if b { + z, ok = m2[[2]string{"x", "y"}] // ERROR "stack object .autotmp_[0-9]+ \[2\]string$" + } + z, ok = m2[[2]string{"x", "y"}] + z, ok = m2[[2]string{"x", "y"}] + printbytepointer(z) + print(ok) +} + +func f24() { + // key temporary for map access using array literal key. + // value temporary too. + if b { + m2[[2]string{"x", "y"}] = nil // ERROR "stack object .autotmp_[0-9]+ \[2\]string$" + } + m2[[2]string{"x", "y"}] = nil + m2[[2]string{"x", "y"}] = nil +} + +// Non-open-coded defers should not cause autotmps. (Open-coded defers do create extra autotmps). +func f25(b bool) { + for i := 0; i < 2; i++ { + // Put in loop to make sure defer is not open-coded + defer g25() + } + if b { + return + } + var x string + x = g14() + printstring(x) + return +} + +func g25() + +// non-escaping ... slices passed to function call should die on return, +// so that the temporaries do not stack and do not cause ambiguously +// live variables. + +func f26(b bool) { + if b { + print26((*int)(nil), (*int)(nil), (*int)(nil)) // ERROR "stack object .autotmp_[0-9]+ \[3\]interface \{\}$" + } + print26((*int)(nil), (*int)(nil), (*int)(nil)) + print26((*int)(nil), (*int)(nil), (*int)(nil)) + printnl() +} + +//go:noescape +func print26(...interface{}) + +// non-escaping closures passed to function call should die on return + +func f27(b bool) { + x := 0 + if b { + call27(func() { x++ }) // ERROR "stack object .autotmp_[0-9]+ struct \{" + } + call27(func() { x++ }) + call27(func() { x++ }) + printnl() +} + +// but defer does escape to later execution in the function + +func f27defer(b bool) { + x := 0 + if b { + defer call27(func() { x++ }) // ERROR "stack object .autotmp_[0-9]+ struct \{" + } + defer call27(func() { x++ }) // ERROR "stack object .autotmp_[0-9]+ struct \{" + printnl() // ERROR "live at call to printnl: .autotmp_[0-9]+ .autotmp_[0-9]+" + return // ERROR "live at call to call27: .autotmp_[0-9]+" +} + +// and newproc (go) escapes to the heap + +func f27go(b bool) { + x := 0 + if b { + go call27(func() { x++ }) // ERROR "live at call to newobject: &x$" "live at call to newproc: &x$" + } + go call27(func() { x++ }) // ERROR "live at call to newobject: &x$" + printnl() +} + +//go:noescape +func call27(func()) + +// concatstring slice should die on return + +var s1, s2, s3, s4, s5, s6, s7, s8, s9, s10 string + +func f28(b bool) { + if b { + printstring(s1 + s2 + s3 + s4 + s5 + s6 + s7 + s8 + s9 + s10) // ERROR "stack object .autotmp_[0-9]+ \[10\]string$" + } + printstring(s1 + s2 + s3 + s4 + s5 + s6 + s7 + s8 + s9 + s10) + printstring(s1 + s2 + s3 + s4 + s5 + s6 + s7 + s8 + s9 + s10) +} + +// map iterator should die on end of range loop + +func f29(b bool) { + if b { + for k := range m { // ERROR "live at call to mapiterinit: .autotmp_[0-9]+$" "live at call to mapiternext: .autotmp_[0-9]+$" "stack object .autotmp_[0-9]+ map.iter\[string\]int$" + printstring(k) // ERROR "live at call to printstring: .autotmp_[0-9]+$" + } + } + for k := range m { // ERROR "live at call to mapiterinit: .autotmp_[0-9]+$" "live at call to mapiternext: .autotmp_[0-9]+$" + printstring(k) // ERROR "live at call to printstring: .autotmp_[0-9]+$" + } + for k := range m { // ERROR "live at call to mapiterinit: .autotmp_[0-9]+$" "live at call to mapiternext: .autotmp_[0-9]+$" + printstring(k) // ERROR "live at call to printstring: .autotmp_[0-9]+$" + } +} + +// copy of array of pointers should die at end of range loop +var pstructarr [10]pstruct + +// Struct size chosen to make pointer to element in pstructarr +// not computable by strength reduction. +type pstruct struct { + intp *int + _ [8]byte +} + +func f30(b bool) { + // live temp during printintpointer(p): + // the internal iterator pointer if a pointer to pstruct in pstructarr + // can not be easily computed by strength reduction. + if b { + for _, p := range pstructarr { // ERROR "stack object .autotmp_[0-9]+ \[10\]pstruct$" + printintpointer(p.intp) // ERROR "live at call to printintpointer: .autotmp_[0-9]+$" + } + } + for _, p := range pstructarr { + printintpointer(p.intp) // ERROR "live at call to printintpointer: .autotmp_[0-9]+$" + } + for _, p := range pstructarr { + printintpointer(p.intp) // ERROR "live at call to printintpointer: .autotmp_[0-9]+$" + } +} + +// conversion to interface should not leave temporary behind + +func f31(b1, b2, b3 bool) { + if b1 { + g31(g18()) // ERROR "stack object .autotmp_[0-9]+ \[2\]string$" + } + if b2 { + h31(g18()) // ERROR "live at call to convT2E: .autotmp_[0-9]+$" "live at call to newobject: .autotmp_[0-9]+$" + } + if b3 { + panic(g18()) + } + print(b3) +} + +func g31(interface{}) +func h31(...interface{}) + +// non-escaping partial functions passed to function call should die on return + +type T32 int + +func (t *T32) Inc() { // ERROR "live at entry to \(\*T32\).Inc: t$" + *t++ +} + +var t32 T32 + +func f32(b bool) { + if b { + call32(t32.Inc) // ERROR "stack object .autotmp_[0-9]+ struct \{" + } + call32(t32.Inc) + call32(t32.Inc) +} + +//go:noescape +func call32(func()) + +// temporaries introduced during if conditions and && || expressions +// should die once the condition has been acted upon. + +var m33 map[interface{}]int + +func f33() { + if m33[byteptr()] == 0 { // ERROR "stack object .autotmp_[0-9]+ interface \{\}$" + printnl() + return + } else { + printnl() + } + printnl() +} + +func f34() { + if m33[byteptr()] == 0 { // ERROR "stack object .autotmp_[0-9]+ interface \{\}$" + printnl() + return + } + printnl() +} + +func f35() { + if m33[byteptr()] == 0 && // ERROR "stack object .autotmp_[0-9]+ interface \{\}" + m33[byteptr()] == 0 { // ERROR "stack object .autotmp_[0-9]+ interface \{\}" + printnl() + return + } + printnl() +} + +func f36() { + if m33[byteptr()] == 0 || // ERROR "stack object .autotmp_[0-9]+ interface \{\}" + m33[byteptr()] == 0 { // ERROR "stack object .autotmp_[0-9]+ interface \{\}" + printnl() + return + } + printnl() +} + +func f37() { + if (m33[byteptr()] == 0 || // ERROR "stack object .autotmp_[0-9]+ interface \{\}" + m33[byteptr()] == 0) && // ERROR "stack object .autotmp_[0-9]+ interface \{\}" + m33[byteptr()] == 0 { + printnl() + return + } + printnl() +} + +// select temps should disappear in the case bodies + +var c38 chan string + +func fc38() chan string +func fi38(int) *string +func fb38() *bool + +func f38(b bool) { + // we don't care what temps are printed on the lines with output. + // we care that the println lines have no live variables + // and therefore no output. + if b { + select { // ERROR "live at call to selectgo:( .autotmp_[0-9]+)+$" "stack object .autotmp_[0-9]+ \[4\]struct \{" + case <-fc38(): + printnl() + case fc38() <- *fi38(1): // ERROR "live at call to fc38:( .autotmp_[0-9]+)+$" "live at call to fi38:( .autotmp_[0-9]+)+$" "stack object .autotmp_[0-9]+ string$" + printnl() + case *fi38(2) = <-fc38(): // ERROR "live at call to fc38:( .autotmp_[0-9]+)+$" "live at call to fi38:( .autotmp_[0-9]+)+$" "stack object .autotmp_[0-9]+ string$" + printnl() + case *fi38(3), *fb38() = <-fc38(): // ERROR "stack object .autotmp_[0-9]+ string$" "live at call to fc38:( .autotmp_[0-9]+)+$" "live at call to fi38:( .autotmp_[0-9]+)+$" + printnl() + } + printnl() + } + printnl() +} + +// issue 8097: mishandling of x = x during return. + +func f39() (x []int) { + x = []int{1} + printnl() // ERROR "live at call to printnl: .autotmp_[0-9]+$" + return x +} + +func f39a() (x []int) { + x = []int{1} + printnl() // ERROR "live at call to printnl: .autotmp_[0-9]+$" + return +} + +func f39b() (x [10]*int) { + x = [10]*int{} + x[0] = new(int) // ERROR "live at call to newobject: x$" + printnl() // ERROR "live at call to printnl: x$" + return x +} + +func f39c() (x [10]*int) { + x = [10]*int{} + x[0] = new(int) // ERROR "live at call to newobject: x$" + printnl() // ERROR "live at call to printnl: x$" + return +} + +// issue 8142: lost 'addrtaken' bit on inlined variables. +// no inlining in this test, so just checking that non-inlined works. + +type T40 struct { + m map[int]int +} + +//go:noescape +func useT40(*T40) + +func newT40() *T40 { + ret := T40{} + ret.m = make(map[int]int, 42) // ERROR "live at call to makemap: &ret$" + return &ret +} + +func bad40() { + t := newT40() + _ = t + printnl() +} + +func good40() { + ret := T40{} // ERROR "stack object ret T40$" + ret.m = make(map[int]int) // ERROR "live at call to fastrand: .autotmp_[0-9]+$" "stack object .autotmp_[0-9]+ map.hdr\[int\]int$" + t := &ret + printnl() // ERROR "live at call to printnl: ret$" + // Note: ret is live at the printnl because the compiler moves &ret + // from before the printnl to after. + useT40(t) +} + +func ddd1(x, y *int) { // ERROR "live at entry to ddd1: x y$" + ddd2(x, y) // ERROR "stack object .autotmp_[0-9]+ \[2\]\*int$" + printnl() + // Note: no .?autotmp live at printnl. See issue 16996. +} +func ddd2(a ...*int) { // ERROR "live at entry to ddd2: a$" + sink = a[0] +} + +// issue 16016: autogenerated wrapper should have arguments live +type T struct{} + +func (*T) Foo(ptr *int) {} + +type R struct{ *T } // ERRORAUTO "live at entry to \(\*R\)\.Foo: \.this ptr" "live at entry to R\.Foo: \.this ptr" + +// issue 18860: output arguments must be live all the time if there is a defer. +// In particular, at printint r must be live. +func f41(p, q *int) (r *int) { // ERROR "live at entry to f41: p q$" + r = p + defer func() { + recover() + }() + printint(0) // ERROR "live at call to printint: q r .autotmp_[0-9]+$" + r = q + return // ERROR "live at call to f41.func1: r .autotmp_[0-9]+$" +} + +func f42() { + var p, q, r int + f43([]*int{&p, &q, &r}) // ERROR "stack object .autotmp_[0-9]+ \[3\]\*int$" + f43([]*int{&p, &r, &q}) + f43([]*int{&q, &p, &r}) +} + +//go:noescape +func f43(a []*int) + +// Assigning to a sub-element that makes up an entire local variable +// should clobber that variable. +func f44(f func() [2]*int) interface{} { // ERROR "live at entry to f44: f" + type T struct { + s [1][2]*int + } + ret := T{} + ret.s[0] = f() + return ret // ERROR "stack object .autotmp_5 T" +} |