mirror of
https://github.com/golang/go
synced 2024-11-23 10:20:03 -07:00
9a8372f8bd
The previous CL introduced stack objects. This CL removes the old ambiguously live liveness analysis. After this CL we're relying on stack objects exclusively. Update a bunch of liveness tests to reflect the new world. Fixes #22350 Change-Id: I739b26e015882231011ce6bc1a7f426049e59f31 Reviewed-on: https://go-review.googlesource.com/c/134156 Reviewed-by: Austin Clements <austin@google.com> Reviewed-by: Cherry Zhang <cherryyz@google.com>
697 lines
19 KiB
Go
697 lines
19 KiB
Go
// 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$"
|
|
*y = 54
|
|
z = &y
|
|
}
|
|
printint(**z) // nothing live here
|
|
}
|
|
|
|
// confusion about the _ result used to cause spurious "live at entry to f6: _".
|
|
|
|
func f6() (_, y string) {
|
|
y = "hello"
|
|
return
|
|
}
|
|
|
|
// confusion about addressed results used to cause "live at entry to f7: x".
|
|
|
|
func f7() (x string) { // ERROR "stack object x string"
|
|
_ = &x
|
|
x = "hello"
|
|
return
|
|
}
|
|
|
|
// ignoring block returns used to cause "live at entry to f8: x, y".
|
|
|
|
func f8() (x, y string) {
|
|
return g8()
|
|
}
|
|
|
|
func g8() (string, string)
|
|
|
|
// ignoring block assignments used to cause "live at entry to f9: x"
|
|
// issue 7205
|
|
|
|
var i9 interface{}
|
|
|
|
func f9() bool {
|
|
g8()
|
|
x := i9
|
|
y := interface{}(str()) // ERROR "live at call to convT2Estring: x.data$" "live at call to str: x.data$" "stack object .autotmp_[0-9]+ string$"
|
|
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 \{\}$"
|
|
}
|
|
delete(mi, iface()) // ERROR "stack object .autotmp_[0-9]+ interface \{\}$"
|
|
delete(mi, iface()) // ERROR "stack object .autotmp_[0-9]+ interface \{\}$"
|
|
}
|
|
|
|
var m2s map[string]*byte
|
|
var m2 map[[2]string]*byte
|
|
var x2 [2]string
|
|
var bp *byte
|
|
|
|
func f17a(p *byte) { // ERROR "live at entry to f17a: p$"
|
|
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()] // ERROR "stack object .autotmp_[0-9]+ \[2\]string$"
|
|
z = m2[g18()] // ERROR "stack object .autotmp_[0-9]+ \[2\]string$"
|
|
printbytepointer(z)
|
|
}
|
|
|
|
var ch chan *byte
|
|
|
|
// byteptr is used to ensure that a temp is required for runtime calls below.
|
|
func byteptr() *byte
|
|
|
|
func f19() {
|
|
// dest temporary for channel receive.
|
|
var z *byte
|
|
|
|
if b {
|
|
z = <-ch // ERROR "stack object .autotmp_[0-9]+ \*byte$"
|
|
}
|
|
z = <-ch // ERROR "stack object .autotmp_[0-9]+ \*byte$"
|
|
z = <-ch // ERROR "stack object .autotmp_[0-9]+ \*byte$" "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() // ERROR "stack object .autotmp_[0-9]+ \*byte$"
|
|
ch <- byteptr() // ERROR "stack object .autotmp_[0-9]+ \*byte$"
|
|
}
|
|
|
|
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"}] // ERROR "stack object .autotmp_[0-9]+ \[2\]string$"
|
|
z = m2[[2]string{"x", "y"}] // ERROR "stack object .autotmp_[0-9]+ \[2\]string$"
|
|
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"}] // ERROR "stack object .autotmp_[0-9]+ \[2\]string$"
|
|
z, ok = m2[[2]string{"x", "y"}] // ERROR "stack object .autotmp_[0-9]+ \[2\]string$"
|
|
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 // ERROR "stack object .autotmp_[0-9]+ \[2\]string$"
|
|
m2[[2]string{"x", "y"}] = nil // ERROR "stack object .autotmp_[0-9]+ \[2\]string$"
|
|
}
|
|
|
|
// defer should not cause spurious ambiguously live variables
|
|
|
|
func f25(b bool) {
|
|
defer g25()
|
|
if b {
|
|
return
|
|
}
|
|
var x string
|
|
x = g14()
|
|
printstring(x)
|
|
}
|
|
|
|
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)) // ERROR "stack object .autotmp_[0-9]+ \[3\]interface \{\}$"
|
|
print26((*int)(nil), (*int)(nil), (*int)(nil)) // ERROR "stack object .autotmp_[0-9]+ \[3\]interface \{\}$"
|
|
printnl()
|
|
}
|
|
|
|
//go:noescape
|
|
func print26(...interface{})
|
|
|
|
// non-escaping closures passed to function call should die on return
|
|
|
|
func f27(b bool) {
|
|
x := 0
|
|
if b {
|
|
call27(func() { x++ }) // ERROR "stack object .autotmp_[0-9]+ struct \{"
|
|
}
|
|
call27(func() { x++ }) // ERROR "stack object .autotmp_[0-9]+ struct \{"
|
|
call27(func() { x++ }) // ERROR "stack object .autotmp_[0-9]+ struct \{"
|
|
printnl()
|
|
}
|
|
|
|
// but defer does escape to later execution in the function
|
|
|
|
func f27defer(b bool) {
|
|
x := 0
|
|
if b {
|
|
defer call27(func() { x++ }) // ERROR "stack object .autotmp_[0-9]+ struct \{"
|
|
}
|
|
defer call27(func() { x++ }) // ERROR "stack object .autotmp_[0-9]+ struct \{"
|
|
printnl()
|
|
}
|
|
|
|
// and newproc (go) escapes to the heap
|
|
|
|
func f27go(b bool) {
|
|
x := 0
|
|
if b {
|
|
go call27(func() { x++ }) // ERROR "live at call to newobject: &x$" "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) // ERROR "stack object .autotmp_[0-9]+ \[10\]string$"
|
|
printstring(s1 + s2 + s3 + s4 + s5 + s6 + s7 + s8 + s9 + s10) // ERROR "stack object .autotmp_[0-9]+ \[10\]string$"
|
|
}
|
|
|
|
// map iterator should die on end of range loop
|
|
|
|
func f29(b bool) {
|
|
if b {
|
|
for k := range m { // ERROR "live at call to mapiterinit: .autotmp_[0-9]+$" "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]+$" "live at call to mapiternext: .autotmp_[0-9]+$" "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]+$" "live at call to mapiternext: .autotmp_[0-9]+$" "stack object .autotmp_[0-9]+ map.iter\[string\]int$"
|
|
printstring(k) // ERROR "live at call to printstring: .autotmp_[0-9]+$"
|
|
}
|
|
}
|
|
|
|
// 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 { // ERROR "stack object .autotmp_[0-9]+ \[10\]pstruct$"
|
|
printintpointer(p.intp) // ERROR "live at call to printintpointer: .autotmp_[0-9]+$"
|
|
}
|
|
for _, p := range pstructarr { // ERROR "stack object .autotmp_[0-9]+ \[10\]pstruct$"
|
|
printintpointer(p.intp) // ERROR "live at call to printintpointer: .autotmp_[0-9]+$"
|
|
}
|
|
}
|
|
|
|
// conversion to interface should not leave temporary behind
|
|
|
|
func f31(b1, b2, b3 bool) {
|
|
if b1 {
|
|
g31(str()) // ERROR "stack object .autotmp_[0-9]+ string$"
|
|
}
|
|
if b2 {
|
|
h31(str()) // ERROR "live at call to convT2Estring: .autotmp_[0-9]+$" "live at call to newobject: .autotmp_[0-9]+$" "stack object .autotmp_[0-9]+ string$"
|
|
}
|
|
if b3 {
|
|
panic(str()) // ERROR "stack object .autotmp_[0-9]+ string$"
|
|
}
|
|
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$"
|
|
*t++
|
|
}
|
|
|
|
var t32 T32
|
|
|
|
func f32(b bool) {
|
|
if b {
|
|
call32(t32.Inc) // ERROR "stack object .autotmp_[0-9]+ struct \{"
|
|
}
|
|
call32(t32.Inc) // ERROR "stack object .autotmp_[0-9]+ struct \{"
|
|
call32(t32.Inc) // ERROR "stack object .autotmp_[0-9]+ struct \{"
|
|
}
|
|
|
|
//go:noescape
|
|
func call32(func())
|
|
|
|
// temporaries introduced during if conditions and && || expressions
|
|
// should die once the condition has been acted upon.
|
|
|
|
var m33 map[interface{}]int
|
|
|
|
func f33() {
|
|
if m33[byteptr()] == 0 { // ERROR "stack object .autotmp_[0-9]+ interface \{\}$"
|
|
printnl()
|
|
return
|
|
} else {
|
|
printnl()
|
|
}
|
|
printnl()
|
|
}
|
|
|
|
func f34() {
|
|
if m33[byteptr()] == 0 { // ERROR "stack object .autotmp_[0-9]+ interface \{\}$"
|
|
printnl()
|
|
return
|
|
}
|
|
printnl()
|
|
}
|
|
|
|
func f35() {
|
|
if m33[byteptr()] == 0 && // ERROR "stack object .autotmp_[0-9]+ interface \{\}"
|
|
m33[byteptr()] == 0 { // ERROR "stack object .autotmp_[0-9]+ interface \{\}"
|
|
printnl()
|
|
return
|
|
}
|
|
printnl()
|
|
}
|
|
|
|
func f36() {
|
|
if m33[byteptr()] == 0 || // ERROR "stack object .autotmp_[0-9]+ interface \{\}"
|
|
m33[byteptr()] == 0 { // ERROR "stack object .autotmp_[0-9]+ interface \{\}"
|
|
printnl()
|
|
return
|
|
}
|
|
printnl()
|
|
}
|
|
|
|
func f37() {
|
|
if (m33[byteptr()] == 0 || // ERROR "stack object .autotmp_[0-9]+ interface \{\}"
|
|
m33[byteptr()] == 0) && // ERROR "stack object .autotmp_[0-9]+ interface \{\}"
|
|
m33[byteptr()] == 0 { // ERROR "stack object .autotmp_[0-9]+ interface \{\}"
|
|
printnl()
|
|
return
|
|
}
|
|
printnl()
|
|
}
|
|
|
|
// select temps should disappear in the case bodies
|
|
|
|
var c38 chan string
|
|
|
|
func fc38() chan string
|
|
func fi38(int) *string
|
|
func fb38() *bool
|
|
|
|
func f38(b bool) {
|
|
// we don't care what temps are printed on the lines with output.
|
|
// we care that the println lines have no live variables
|
|
// and therefore no output.
|
|
if b {
|
|
select { // ERROR "live at call to selectgo:( .autotmp_[0-9]+)+$" "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$"
|
|
ret.m = make(map[int]int) // ERROR "live at call to fastrand: .autotmp_[0-9]+ ret$" "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$"
|
|
r = p
|
|
defer func() { // ERROR "live at call to deferproc: q r$" "live at call to deferreturn: r$"
|
|
recover()
|
|
}()
|
|
printint(0) // ERROR "live at call to printint: q r$"
|
|
r = q
|
|
return // ERROR "live at call to deferreturn: r$"
|
|
}
|