mirror of
https://github.com/golang/go
synced 2024-11-27 04:41:33 -07:00
8217b4a203
created panic1.go just so diffs were available. After this CL is in, I'd like to move panic.go -> defer.go and panic1.go -> panic.go. LGTM=rsc R=rsc, khr CC=golang-codereviews https://golang.org/cl/133530045
628 lines
16 KiB
Go
628 lines
16 KiB
Go
// errorcheck -0 -l -live
|
|
|
|
// 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 f1() {
|
|
var x *int
|
|
print(&x) // ERROR "live at call to printpointer: x$"
|
|
print(&x) // ERROR "live at call to printpointer: x$"
|
|
}
|
|
|
|
func f2(b bool) {
|
|
if b {
|
|
print(0) // nothing live here
|
|
return
|
|
}
|
|
var x *int
|
|
print(&x) // ERROR "live at call to printpointer: x$"
|
|
print(&x) // ERROR "live at call to printpointer: x$"
|
|
}
|
|
|
|
func f3(b bool) {
|
|
// Because x and y are ambiguously live, they appear
|
|
// live throughout the function, to avoid being poisoned
|
|
// in GODEBUG=gcdead=1 mode.
|
|
|
|
print(0) // ERROR "live at call to printint: x y$"
|
|
if b == false {
|
|
print(0) // ERROR "live at call to printint: x y$"
|
|
return
|
|
}
|
|
|
|
if b {
|
|
var x *int
|
|
print(&x) // ERROR "live at call to printpointer: x y$"
|
|
print(&x) // ERROR "live at call to printpointer: x y$"
|
|
} else {
|
|
var y *int
|
|
print(&y) // ERROR "live at call to printpointer: x y$"
|
|
print(&y) // ERROR "live at call to printpointer: x y$"
|
|
}
|
|
print(0) // ERROR "live at call to printint: x y$" "x \(type \*int\) is ambiguously live" "y \(type \*int\) is ambiguously live"
|
|
}
|
|
|
|
// 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 {
|
|
print(0) // x not live here
|
|
return
|
|
}
|
|
var z **int
|
|
x := new(int)
|
|
*x = 42
|
|
z = &x
|
|
print(**z) // ERROR "live at call to printint: x z$"
|
|
if b2 {
|
|
print(1) // ERROR "live at call to printint: x$"
|
|
return
|
|
}
|
|
for {
|
|
print(**z) // ERROR "live at call to printint: x z$"
|
|
}
|
|
}
|
|
|
|
func f5(b1 bool) {
|
|
var z **int
|
|
if b1 {
|
|
x := new(int)
|
|
*x = 42
|
|
z = &x
|
|
} else {
|
|
y := new(int)
|
|
*y = 54
|
|
z = &y
|
|
}
|
|
print(**z) // ERROR "live at call to printint: x y$" "x \(type \*int\) is ambiguously live" "y \(type \*int\) is ambiguously live"
|
|
}
|
|
|
|
// 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) {
|
|
_ = &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
|
|
// using complex number in comparison so that
|
|
// there is always a convT2E, no matter what the
|
|
// interface rules are.
|
|
return x != 99.0i // ERROR "live at call to convT2E: x"
|
|
}
|
|
|
|
// 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 "live at call to newselect: autotmp" "live at call to selectgo: autotmp"
|
|
case <-c: // ERROR "live at call to selectrecv: autotmp"
|
|
return nil
|
|
case <-c: // ERROR "live at call to selectrecv: autotmp"
|
|
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".
|
|
print(1) // nothing live here!
|
|
select { // ERROR "live at call to newselect: autotmp" "live at call to selectgo: autotmp"
|
|
case <-c: // ERROR "live at call to selectrecv: autotmp"
|
|
return nil
|
|
case <-c: // ERROR "live at call to selectrecv: autotmp"
|
|
return nil
|
|
}
|
|
}
|
|
println(*p)
|
|
return nil
|
|
}
|
|
|
|
func f11c() *int {
|
|
p := new(int)
|
|
if b {
|
|
// Unlike previous, the cases in this select fall through,
|
|
// so we can get to the println, so p is not dead.
|
|
print(1) // ERROR "live at call to printint: p"
|
|
select { // ERROR "live at call to newselect: autotmp.* p" "live at call to selectgo: autotmp.* p"
|
|
case <-c: // ERROR "live at call to selectrecv: autotmp.* p"
|
|
case <-c: // ERROR "live at call to selectrecv: autotmp.* p"
|
|
}
|
|
}
|
|
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 := "hello"
|
|
s = h13(s, g13(s)) // ERROR "live at call to g13: s"
|
|
}
|
|
|
|
func g13(string) string
|
|
func h13(string, string) string
|
|
|
|
// more incorrectly placed VARDEF.
|
|
|
|
func f14() {
|
|
x := g14()
|
|
print(&x) // ERROR "live at call to printpointer: x"
|
|
}
|
|
|
|
func g14() string
|
|
|
|
func f15() {
|
|
var x string
|
|
_ = &x
|
|
x = g15() // ERROR "live at call to g15: x"
|
|
print(x) // ERROR "live at call to printstring: x"
|
|
}
|
|
|
|
func g15() 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
|
|
|
|
func f16() {
|
|
if b {
|
|
delete(m, "hi") // ERROR "live at call to mapdelete: autotmp_[0-9]+$"
|
|
}
|
|
delete(m, "hi") // ERROR "live at call to mapdelete: autotmp_[0-9]+$"
|
|
delete(m, "hi") // ERROR "live at call to mapdelete: autotmp_[0-9]+$"
|
|
}
|
|
|
|
var m2s map[string]*byte
|
|
var m2 map[[2]string]*byte
|
|
var x2 [2]string
|
|
var bp *byte
|
|
|
|
func f17a() {
|
|
// value temporary only
|
|
if b {
|
|
m2[x2] = nil // ERROR "live at call to mapassign1: autotmp_[0-9]+$"
|
|
}
|
|
m2[x2] = nil // ERROR "live at call to mapassign1: autotmp_[0-9]+$"
|
|
m2[x2] = nil // ERROR "live at call to mapassign1: autotmp_[0-9]+$"
|
|
}
|
|
|
|
func f17b() {
|
|
// key temporary only
|
|
if b {
|
|
m2s["x"] = bp // ERROR "live at call to mapassign1: autotmp_[0-9]+$"
|
|
}
|
|
m2s["x"] = bp // ERROR "live at call to mapassign1: autotmp_[0-9]+$"
|
|
m2s["x"] = bp // ERROR "live at call to mapassign1: autotmp_[0-9]+$"
|
|
}
|
|
|
|
func f17c() {
|
|
// key and value temporaries
|
|
if b {
|
|
m2s["x"] = nil // ERROR "live at call to mapassign1: autotmp_[0-9]+ autotmp_[0-9]+$"
|
|
}
|
|
m2s["x"] = nil // ERROR "live at call to mapassign1: autotmp_[0-9]+ autotmp_[0-9]+$"
|
|
m2s["x"] = nil // ERROR "live at call to mapassign1: autotmp_[0-9]+ autotmp_[0-9]+$"
|
|
}
|
|
|
|
func g18() [2]string
|
|
|
|
func f18() {
|
|
// key temporary for mapaccess.
|
|
// temporary introduced by orderexpr.
|
|
var z *byte
|
|
if b {
|
|
z = m2[g18()] // ERROR "live at call to mapaccess1: autotmp_[0-9]+$"
|
|
}
|
|
z = m2[g18()] // ERROR "live at call to mapaccess1: autotmp_[0-9]+$"
|
|
z = m2[g18()] // ERROR "live at call to mapaccess1: autotmp_[0-9]+$"
|
|
print(z)
|
|
}
|
|
|
|
var ch chan *byte
|
|
|
|
func f19() {
|
|
// dest temporary for channel receive.
|
|
var z *byte
|
|
|
|
if b {
|
|
z = <-ch // ERROR "live at call to chanrecv1: autotmp_[0-9]+$"
|
|
}
|
|
z = <-ch // ERROR "live at call to chanrecv1: autotmp_[0-9]+$"
|
|
z = <-ch // ERROR "live at call to chanrecv1: autotmp_[0-9]+$"
|
|
print(z)
|
|
}
|
|
|
|
func f20() {
|
|
// src temporary for channel send
|
|
if b {
|
|
ch <- nil // ERROR "live at call to chansend1: autotmp_[0-9]+$"
|
|
}
|
|
ch <- nil // ERROR "live at call to chansend1: autotmp_[0-9]+$"
|
|
ch <- nil // ERROR "live at call to chansend1: autotmp_[0-9]+$"
|
|
}
|
|
|
|
func f21() {
|
|
// key temporary for mapaccess using array literal key.
|
|
var z *byte
|
|
if b {
|
|
z = m2[[2]string{"x", "y"}] // ERROR "live at call to mapaccess1: autotmp_[0-9]+$"
|
|
}
|
|
z = m2[[2]string{"x", "y"}] // ERROR "live at call to mapaccess1: autotmp_[0-9]+$"
|
|
z = m2[[2]string{"x", "y"}] // ERROR "live at call to mapaccess1: autotmp_[0-9]+$"
|
|
print(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 "live at call to mapaccess2: autotmp_[0-9]+$"
|
|
}
|
|
z, ok = m2[[2]string{"x", "y"}] // ERROR "live at call to mapaccess2: autotmp_[0-9]+$"
|
|
z, ok = m2[[2]string{"x", "y"}] // ERROR "live at call to mapaccess2: autotmp_[0-9]+$"
|
|
print(z, ok)
|
|
}
|
|
|
|
func f24() {
|
|
// key temporary for map access using array literal key.
|
|
// value temporary too.
|
|
if b {
|
|
m2[[2]string{"x", "y"}] = nil // ERROR "live at call to mapassign1: autotmp_[0-9]+ autotmp_[0-9]+$"
|
|
}
|
|
m2[[2]string{"x", "y"}] = nil // ERROR "live at call to mapassign1: autotmp_[0-9]+ autotmp_[0-9]+$"
|
|
m2[[2]string{"x", "y"}] = nil // ERROR "live at call to mapassign1: autotmp_[0-9]+ autotmp_[0-9]+$"
|
|
}
|
|
|
|
// defer should not cause spurious ambiguously live variables
|
|
|
|
func f25(b bool) {
|
|
defer g25()
|
|
if b {
|
|
return
|
|
}
|
|
var x string
|
|
_ = &x
|
|
x = g15() // ERROR "live at call to g15: x"
|
|
print(x) // ERROR "live at call to printstring: x"
|
|
} // ERROR "live at call to deferreturn: 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 "live at call to print26: autotmp_[0-9]+$"
|
|
}
|
|
print26((*int)(nil), (*int)(nil), (*int)(nil)) // ERROR "live at call to print26: autotmp_[0-9]+$"
|
|
print26((*int)(nil), (*int)(nil), (*int)(nil)) // ERROR "live at call to print26: autotmp_[0-9]+$"
|
|
println()
|
|
}
|
|
|
|
//go:noescape
|
|
func print26(...interface{})
|
|
|
|
// non-escaping closures passed to function call should die on return
|
|
|
|
func f27(b bool) {
|
|
x := 0
|
|
if b {
|
|
call27(func() { x++ }) // ERROR "live at call to call27: autotmp_[0-9]+$"
|
|
}
|
|
call27(func() { x++ }) // ERROR "live at call to call27: autotmp_[0-9]+$"
|
|
call27(func() { x++ }) // ERROR "live at call to call27: autotmp_[0-9]+$"
|
|
println()
|
|
}
|
|
|
|
// but defer does escape to later execution in the function
|
|
|
|
func f27defer(b bool) {
|
|
x := 0
|
|
if b {
|
|
defer call27(func() { x++ }) // ERROR "live at call to deferproc: autotmp_[0-9]+$" "live at call to deferreturn: autotmp_[0-9]+$"
|
|
}
|
|
defer call27(func() { x++ }) // ERROR "live at call to deferproc: autotmp_[0-9]+ autotmp_[0-9]+$" "live at call to deferreturn: autotmp_[0-9]+ autotmp_[0-9]+$" "ambiguously live"
|
|
println() // ERROR "live at call to printnl: autotmp_[0-9]+ autotmp_[0-9]+$"
|
|
} // ERROR "live at call to deferreturn: autotmp_[0-9]+ autotmp_[0-9]+$"
|
|
|
|
// 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$"
|
|
}
|
|
go call27(func() { x++ }) // ERROR "live at call to newobject: &x"
|
|
println()
|
|
}
|
|
|
|
//go:noescape
|
|
func call27(func())
|
|
|
|
// concatstring slice should die on return
|
|
|
|
var s1, s2, s3, s4, s5, s6, s7, s8, s9, s10 string
|
|
|
|
func f28(b bool) {
|
|
if b {
|
|
print(s1 + s2 + s3 + s4 + s5 + s6 + s7 + s8 + s9 + s10) // ERROR "live at call to concatstrings: autotmp_[0-9]+$" "live at call to printstring: autotmp_[0-9]+$"
|
|
}
|
|
print(s1 + s2 + s3 + s4 + s5 + s6 + s7 + s8 + s9 + s10) // ERROR "live at call to concatstrings: autotmp_[0-9]+$" "live at call to printstring: autotmp_[0-9]+$"
|
|
print(s1 + s2 + s3 + s4 + s5 + s6 + s7 + s8 + s9 + s10) // ERROR "live at call to concatstrings: autotmp_[0-9]+$" "live at call to printstring: autotmp_[0-9]+$"
|
|
}
|
|
|
|
// map iterator should die on end of range loop
|
|
|
|
func f29(b bool) {
|
|
if b {
|
|
for k := range m { // ERROR "live at call to mapiterinit: autotmp_[0-9]+$" "live at call to mapiternext: autotmp_[0-9]+$"
|
|
print(k) // ERROR "live at call to printstring: autotmp_[0-9]+$"
|
|
}
|
|
}
|
|
for k := range m { // ERROR "live at call to mapiterinit: autotmp_[0-9]+$" "live at call to mapiternext: autotmp_[0-9]+$"
|
|
print(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]+$"
|
|
print(k) // ERROR "live at call to printstring: autotmp_[0-9]+$"
|
|
}
|
|
}
|
|
|
|
// copy of array of pointers should die at end of range loop
|
|
|
|
var ptrarr [10]*int
|
|
|
|
func f30(b bool) {
|
|
// two live temps during print(p):
|
|
// the copy of ptrarr and the internal iterator pointer.
|
|
if b {
|
|
for _, p := range ptrarr {
|
|
print(p) // ERROR "live at call to printpointer: autotmp_[0-9]+ autotmp_[0-9]+$"
|
|
}
|
|
}
|
|
for _, p := range ptrarr {
|
|
print(p) // ERROR "live at call to printpointer: autotmp_[0-9]+ autotmp_[0-9]+$"
|
|
}
|
|
for _, p := range ptrarr {
|
|
print(p) // ERROR "live at call to printpointer: autotmp_[0-9]+ autotmp_[0-9]+$"
|
|
}
|
|
}
|
|
|
|
// conversion to interface should not leave temporary behind
|
|
|
|
func f31(b1, b2, b3 bool) {
|
|
if b1 {
|
|
g31("a") // ERROR "live at call to convT2E: autotmp_[0-9]+$" "live at call to g31: autotmp_[0-9]+$"
|
|
}
|
|
if b2 {
|
|
h31("b") // ERROR "live at call to newobject: autotmp_[0-9]+$" "live at call to convT2E: autotmp_[0-9]+ autotmp_[0-9]+$" "live at call to h31: autotmp_[0-9]+$"
|
|
}
|
|
if b3 {
|
|
panic("asdf") // ERROR "live at call to convT2E: autotmp_[0-9]+$" "live at call to gopanic: autotmp_[0-9]+$"
|
|
}
|
|
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"
|
|
*t++
|
|
}
|
|
|
|
var t32 T32
|
|
|
|
func f32(b bool) {
|
|
if b {
|
|
call32(t32.Inc) // ERROR "live at call to call32: autotmp_[0-9]+$"
|
|
}
|
|
call32(t32.Inc) // ERROR "live at call to call32: autotmp_[0-9]+$"
|
|
call32(t32.Inc) // ERROR "live at call to call32: autotmp_[0-9]+$"
|
|
}
|
|
|
|
//go:noescape
|
|
func call32(func())
|
|
|
|
// temporaries introduced during if conditions and && || expressions
|
|
// should die once the condition has been acted upon.
|
|
|
|
var m33 map[interface{}]int
|
|
|
|
func f33() {
|
|
if m33[nil] == 0 { // ERROR "live at call to mapaccess1: autotmp_[0-9]+$"
|
|
println()
|
|
return
|
|
} else {
|
|
println()
|
|
}
|
|
println()
|
|
}
|
|
|
|
func f34() {
|
|
if m33[nil] == 0 { // ERROR "live at call to mapaccess1: autotmp_[0-9]+$"
|
|
println()
|
|
return
|
|
}
|
|
println()
|
|
}
|
|
|
|
func f35() {
|
|
if m33[nil] == 0 && m33[nil] == 0 { // ERROR "live at call to mapaccess1: autotmp_[0-9]+$"
|
|
println()
|
|
return
|
|
}
|
|
println()
|
|
}
|
|
|
|
func f36() {
|
|
if m33[nil] == 0 || m33[nil] == 0 { // ERROR "live at call to mapaccess1: autotmp_[0-9]+$"
|
|
println()
|
|
return
|
|
}
|
|
println()
|
|
}
|
|
|
|
func f37() {
|
|
if (m33[nil] == 0 || m33[nil] == 0) && m33[nil] == 0 { // ERROR "live at call to mapaccess1: autotmp_[0-9]+$"
|
|
println()
|
|
return
|
|
}
|
|
println()
|
|
}
|
|
|
|
// 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"
|
|
case <-fc38(): // ERROR "live at call"
|
|
println()
|
|
case fc38() <- *fi38(1): // ERROR "live at call"
|
|
println()
|
|
case *fi38(2) = <-fc38(): // ERROR "live at call"
|
|
println()
|
|
case *fi38(3), *fb38() = <-fc38(): // ERROR "live at call"
|
|
println()
|
|
}
|
|
println()
|
|
}
|
|
println()
|
|
}
|
|
|
|
// issue 8097: mishandling of x = x during return.
|
|
|
|
func f39() (x []int) {
|
|
x = []int{1}
|
|
println() // ERROR "live at call to printnl: x"
|
|
return x
|
|
}
|
|
|
|
func f39a() (x []int) {
|
|
x = []int{1}
|
|
println() // ERROR "live at call to printnl: x"
|
|
return
|
|
}
|
|
|
|
func f39b() (x [10]*int) {
|
|
x = [10]*int{new(int)} // ERROR "live at call to newobject: x"
|
|
println() // ERROR "live at call to printnl: x"
|
|
return x
|
|
}
|
|
|
|
func f39c() (x [10]*int) {
|
|
x = [10]*int{new(int)} // ERROR "live at call to newobject: x"
|
|
println() // 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
|
|
}
|
|
|
|
func newT40() *T40 {
|
|
ret := T40{ // ERROR "live at call to makemap: &ret"
|
|
make(map[int]int),
|
|
}
|
|
return &ret
|
|
}
|
|
|
|
func bad40() {
|
|
t := newT40()
|
|
println()
|
|
_ = t
|
|
}
|
|
|
|
func good40() {
|
|
ret := T40{ // ERROR "live at call to makemap: ret"
|
|
make(map[int]int),
|
|
}
|
|
t := &ret
|
|
println() // ERROR "live at call to printnl: ret"
|
|
_ = t
|
|
}
|