mirror of
https://github.com/golang/go
synced 2024-11-24 08:40:14 -07:00
309144b7f1
No point in doing anything for x=x assignments.
In addition, skipping these assignments prevents generating:
VARDEF x
COPY x -> x
which is bad because x is incorrectly considered
dead before the vardef.
Fixes #14904
Change-Id: I6817055ec20bcc34a9648617e0439505ee355f82
Reviewed-on: https://go-review.googlesource.com/21470
Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>
Reviewed-by: Dave Cheney <dave@cheney.net>
649 lines
18 KiB
Go
649 lines
18 KiB
Go
// +build amd64
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// errorcheck -0 -l -live -wb=0
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// Copyright 2014 The Go Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style
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// license that can be found in the LICENSE file.
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// liveness tests with inlining disabled.
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// see also live2.go.
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package main
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func printnl()
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//go:noescape
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func printpointer(**int)
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//go:noescape
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func printintpointer(*int)
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//go:noescape
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func printstringpointer(*string)
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//go:noescape
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func printstring(string)
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//go:noescape
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func printbytepointer(*byte)
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func printint(int)
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func f1() {
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var x *int
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printpointer(&x) // ERROR "live at call to printpointer: x$"
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printpointer(&x) // ERROR "live at call to printpointer: x$"
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}
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func f2(b bool) {
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if b {
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printint(0) // nothing live here
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return
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}
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var x *int
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printpointer(&x) // ERROR "live at call to printpointer: x$"
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printpointer(&x) // ERROR "live at call to printpointer: x$"
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}
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func f3(b1, b2 bool) {
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// Because x and y are ambiguously live, they appear
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// live throughout the function, to avoid being poisoned
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// in GODEBUG=gcdead=1 mode.
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printint(0) // ERROR "live at call to printint: x y$"
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if b1 == false {
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printint(0) // ERROR "live at call to printint: x y$"
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return
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}
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if b2 {
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var x *int
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printpointer(&x) // ERROR "live at call to printpointer: x y$"
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printpointer(&x) // ERROR "live at call to printpointer: x y$"
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} else {
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var y *int
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printpointer(&y) // ERROR "live at call to printpointer: x y$"
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printpointer(&y) // ERROR "live at call to printpointer: x y$"
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}
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printint(0) // ERROR "f3: x \(type \*int\) is ambiguously live$" "f3: y \(type \*int\) is ambiguously live$" "live at call to printint: x y$"
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}
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// The old algorithm treated x as live on all code that
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// could flow to a return statement, so it included the
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// function entry and code above the declaration of x
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// but would not include an indirect use of x in an infinite loop.
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// Check that these cases are handled correctly.
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func f4(b1, b2 bool) { // x not live here
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if b2 {
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printint(0) // x not live here
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return
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}
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var z **int
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x := new(int)
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*x = 42
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z = &x
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printint(**z) // ERROR "live at call to printint: x$"
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if b2 {
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printint(1) // x not live here
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return
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}
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for {
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printint(**z) // ERROR "live at call to printint: x$"
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}
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}
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func f5(b1 bool) {
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var z **int
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if b1 {
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x := new(int)
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*x = 42
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z = &x
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} else {
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y := new(int)
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*y = 54
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z = &y
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}
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printint(**z) // ERROR "f5: x \(type \*int\) is ambiguously live$" "f5: y \(type \*int\) is ambiguously live$" "live at call to printint: x y$"
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}
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// confusion about the _ result used to cause spurious "live at entry to f6: _".
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func f6() (_, y string) {
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y = "hello"
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return
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}
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// confusion about addressed results used to cause "live at entry to f7: x".
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func f7() (x string) {
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_ = &x
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x = "hello"
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return
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}
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// ignoring block returns used to cause "live at entry to f8: x, y".
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func f8() (x, y string) {
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return g8()
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}
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func g8() (string, string)
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// ignoring block assignments used to cause "live at entry to f9: x"
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// issue 7205
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var i9 interface{}
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func f9() bool {
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g8()
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x := i9
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return x != interface{}(99.0i) // ERROR "live at call to convT2E: x.data x.type$"
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}
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// liveness formerly confused by UNDEF followed by RET,
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// leading to "live at entry to f10: ~r1" (unnamed result).
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func f10() string {
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panic(1)
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}
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// liveness formerly confused by select, thinking runtime.selectgo
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// can return to next instruction; it always jumps elsewhere.
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// note that you have to use at least two cases in the select
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// to get a true select; smaller selects compile to optimized helper functions.
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var c chan *int
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var b bool
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// this used to have a spurious "live at entry to f11a: ~r0"
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func f11a() *int {
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select { // ERROR "live at call to newselect: autotmp_[0-9]+$" "live at call to selectgo: autotmp_[0-9]+$"
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case <-c: // ERROR "live at call to selectrecv: autotmp_[0-9]+$"
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return nil
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case <-c: // ERROR "live at call to selectrecv: autotmp_[0-9]+$"
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return nil
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}
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}
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func f11b() *int {
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p := new(int)
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if b {
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// At this point p is dead: the code here cannot
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// get to the bottom of the function.
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// This used to have a spurious "live at call to printint: p".
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printint(1) // nothing live here!
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select { // ERROR "live at call to newselect: autotmp_[0-9]+$" "live at call to selectgo: autotmp_[0-9]+$"
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case <-c: // ERROR "live at call to selectrecv: autotmp_[0-9]+$"
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return nil
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case <-c: // ERROR "live at call to selectrecv: autotmp_[0-9]+$"
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return nil
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}
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}
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println(*p)
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return nil
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}
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var sink *int
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func f11c() *int {
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p := new(int)
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sink = p // prevent stack allocation, otherwise p is rematerializeable
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if b {
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// Unlike previous, the cases in this select fall through,
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// so we can get to the println, so p is not dead.
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printint(1) // ERROR "live at call to printint: p$"
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select { // ERROR "live at call to newselect: autotmp_[0-9]+ p$" "live at call to selectgo: autotmp_[0-9]+ p$"
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case <-c: // ERROR "live at call to selectrecv: autotmp_[0-9]+ p$"
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case <-c: // ERROR "live at call to selectrecv: autotmp_[0-9]+ p$"
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}
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}
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println(*p)
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return nil
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}
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// similarly, select{} does not fall through.
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// this used to have a spurious "live at entry to f12: ~r0".
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func f12() *int {
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if b {
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select {}
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} else {
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return nil
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}
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}
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// incorrectly placed VARDEF annotations can cause missing liveness annotations.
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// this used to be missing the fact that s is live during the call to g13 (because it is
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// needed for the call to h13).
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func f13() {
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s := g14()
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s = h13(s, g13(s)) // ERROR "live at call to g13: s.ptr$"
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}
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func g13(string) string
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func h13(string, string) string
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// more incorrectly placed VARDEF.
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func f14() {
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x := g14()
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printstringpointer(&x) // ERROR "live at call to printstringpointer: x$"
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}
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func g14() string
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func f15() {
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var x string
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_ = &x
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x = g15() // ERROR "live at call to g15: x$"
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printstring(x) // ERROR "live at call to printstring: x$"
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}
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func g15() string
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// Checking that various temporaries do not persist or cause
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// ambiguously live values that must be zeroed.
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// The exact temporary names are inconsequential but we are
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// trying to check that there is only one at any given site,
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// and also that none show up in "ambiguously live" messages.
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var m map[string]int
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func f16() {
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if b {
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delete(m, "hi") // ERROR "live at call to mapdelete: autotmp_[0-9]+$"
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}
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delete(m, "hi") // ERROR "live at call to mapdelete: autotmp_[0-9]+$"
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delete(m, "hi") // ERROR "live at call to mapdelete: autotmp_[0-9]+$"
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}
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var m2s map[string]*byte
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var m2 map[[2]string]*byte
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var x2 [2]string
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var bp *byte
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func f17a() {
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// value temporary only
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if b {
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m2[x2] = nil // ERROR "live at call to mapassign1: autotmp_[0-9]+$"
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}
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m2[x2] = nil // ERROR "live at call to mapassign1: autotmp_[0-9]+$"
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m2[x2] = nil // ERROR "live at call to mapassign1: autotmp_[0-9]+$"
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}
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func f17b() {
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// key temporary only
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if b {
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m2s["x"] = bp // ERROR "live at call to mapassign1: autotmp_[0-9]+$"
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}
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m2s["x"] = bp // ERROR "live at call to mapassign1: autotmp_[0-9]+$"
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m2s["x"] = bp // ERROR "live at call to mapassign1: autotmp_[0-9]+$"
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}
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func f17c() {
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// key and value temporaries
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if b {
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m2s["x"] = nil // ERROR "live at call to mapassign1: autotmp_[0-9]+ autotmp_[0-9]+$"
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}
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m2s["x"] = nil // ERROR "live at call to mapassign1: autotmp_[0-9]+ autotmp_[0-9]+$"
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m2s["x"] = nil // ERROR "live at call to mapassign1: autotmp_[0-9]+ autotmp_[0-9]+$"
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}
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func g18() [2]string
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func f18() {
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// key temporary for mapaccess.
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// temporary introduced by orderexpr.
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var z *byte
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if b {
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z = m2[g18()] // ERROR "live at call to mapaccess1: autotmp_[0-9]+$"
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}
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z = m2[g18()] // ERROR "live at call to mapaccess1: autotmp_[0-9]+$"
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z = m2[g18()] // ERROR "live at call to mapaccess1: autotmp_[0-9]+$"
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printbytepointer(z)
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}
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var ch chan *byte
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func f19() {
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// dest temporary for channel receive.
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var z *byte
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if b {
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z = <-ch // ERROR "live at call to chanrecv1: autotmp_[0-9]+$"
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}
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z = <-ch // ERROR "live at call to chanrecv1: autotmp_[0-9]+$"
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z = <-ch // ERROR "live at call to chanrecv1: autotmp_[0-9]+$"
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printbytepointer(z)
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}
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func f20() {
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// src temporary for channel send
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if b {
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ch <- nil // ERROR "live at call to chansend1: autotmp_[0-9]+$"
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}
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ch <- nil // ERROR "live at call to chansend1: autotmp_[0-9]+$"
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ch <- nil // ERROR "live at call to chansend1: autotmp_[0-9]+$"
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}
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func f21() {
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// key temporary for mapaccess using array literal key.
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var z *byte
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if b {
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z = m2[[2]string{"x", "y"}] // ERROR "live at call to mapaccess1: autotmp_[0-9]+$"
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}
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z = m2[[2]string{"x", "y"}] // ERROR "live at call to mapaccess1: autotmp_[0-9]+$"
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z = m2[[2]string{"x", "y"}] // ERROR "live at call to mapaccess1: autotmp_[0-9]+$"
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printbytepointer(z)
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}
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func f23() {
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// key temporary for two-result map access using array literal key.
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var z *byte
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var ok bool
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if b {
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z, ok = m2[[2]string{"x", "y"}] // ERROR "live at call to mapaccess2: autotmp_[0-9]+$"
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}
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z, ok = m2[[2]string{"x", "y"}] // ERROR "live at call to mapaccess2: autotmp_[0-9]+$"
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z, ok = m2[[2]string{"x", "y"}] // ERROR "live at call to mapaccess2: autotmp_[0-9]+$"
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printbytepointer(z)
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print(ok)
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}
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func f24() {
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// key temporary for map access using array literal key.
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// value temporary too.
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if b {
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m2[[2]string{"x", "y"}] = nil // ERROR "live at call to mapassign1: autotmp_[0-9]+ autotmp_[0-9]+$"
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}
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m2[[2]string{"x", "y"}] = nil // ERROR "live at call to mapassign1: autotmp_[0-9]+ autotmp_[0-9]+$"
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m2[[2]string{"x", "y"}] = nil // ERROR "live at call to mapassign1: autotmp_[0-9]+ autotmp_[0-9]+$"
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}
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// defer should not cause spurious ambiguously live variables
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func f25(b bool) {
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defer g25()
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if b {
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return
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}
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var x string
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_ = &x
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x = g15() // ERROR "live at call to g15: x$"
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printstring(x) // ERROR "live at call to printstring: x$"
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} // ERROR "live at call to deferreturn: x$"
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func g25()
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// non-escaping ... slices passed to function call should die on return,
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// so that the temporaries do not stack and do not cause ambiguously
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// live variables.
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func f26(b bool) {
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if b {
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print26((*int)(nil), (*int)(nil), (*int)(nil)) // ERROR "live at call to print26: autotmp_[0-9]+$"
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}
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print26((*int)(nil), (*int)(nil), (*int)(nil)) // ERROR "live at call to print26: autotmp_[0-9]+$"
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print26((*int)(nil), (*int)(nil), (*int)(nil)) // ERROR "live at call to print26: autotmp_[0-9]+$"
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printnl()
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}
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//go:noescape
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func print26(...interface{})
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// non-escaping closures passed to function call should die on return
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func f27(b bool) {
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x := 0
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if b {
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call27(func() { x++ }) // ERROR "live at call to call27: autotmp_[0-9]+$"
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}
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call27(func() { x++ }) // ERROR "live at call to call27: autotmp_[0-9]+$"
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call27(func() { x++ }) // ERROR "live at call to call27: autotmp_[0-9]+$"
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printnl()
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}
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// but defer does escape to later execution in the function
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func f27defer(b bool) {
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x := 0
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if b {
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defer call27(func() { x++ }) // ERROR "live at call to deferproc: autotmp_[0-9]+$" "live at call to deferreturn: autotmp_[0-9]+$"
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}
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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]+$"
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printnl() // ERROR "live at call to printnl: autotmp_[0-9]+ autotmp_[0-9]+$"
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} // ERROR "live at call to deferreturn: autotmp_[0-9]+ autotmp_[0-9]+$"
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// and newproc (go) escapes to the heap
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func f27go(b bool) {
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x := 0
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if b {
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go call27(func() { x++ }) // ERROR "live at call to newobject: &x$" "live at call to newproc: &x$"
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}
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go call27(func() { x++ }) // ERROR "live at call to newobject: &x$"
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printnl()
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}
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//go:noescape
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func call27(func())
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// concatstring slice should die on return
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var s1, s2, s3, s4, s5, s6, s7, s8, s9, s10 string
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func f28(b bool) {
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if b {
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printstring(s1 + s2 + s3 + s4 + s5 + s6 + s7 + s8 + s9 + s10) // ERROR "live at call to concatstrings: autotmp_[0-9]+$" "live at call to printstring: autotmp_[0-9]+$"
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}
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printstring(s1 + s2 + s3 + s4 + s5 + s6 + s7 + s8 + s9 + s10) // ERROR "live at call to concatstrings: autotmp_[0-9]+$" "live at call to printstring: autotmp_[0-9]+$"
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printstring(s1 + s2 + s3 + s4 + s5 + s6 + s7 + s8 + s9 + s10) // ERROR "live at call to concatstrings: autotmp_[0-9]+$" "live at call to printstring: autotmp_[0-9]+$"
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}
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// map iterator should die on end of range loop
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func f29(b bool) {
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if b {
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for k := range m { // ERROR "live at call to mapiterinit: autotmp_[0-9]+$" "live at call to mapiternext: autotmp_[0-9]+$"
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printstring(k) // ERROR "live at call to printstring: autotmp_[0-9]+$"
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}
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}
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for k := range m { // ERROR "live at call to mapiterinit: autotmp_[0-9]+$" "live at call to mapiternext: autotmp_[0-9]+$"
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printstring(k) // ERROR "live at call to printstring: autotmp_[0-9]+$"
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}
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for k := range m { // ERROR "live at call to mapiterinit: autotmp_[0-9]+$" "live at call to mapiternext: autotmp_[0-9]+$"
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printstring(k) // ERROR "live at call to printstring: autotmp_[0-9]+$"
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}
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}
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// copy of array of pointers should die at end of range loop
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var ptrarr [10]*int
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func f30(b bool) {
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// two live temps during print(p):
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// the copy of ptrarr and the internal iterator pointer.
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if b {
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for _, p := range ptrarr {
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printintpointer(p) // ERROR "live at call to printintpointer: autotmp_[0-9]+ autotmp_[0-9]+$"
|
|
}
|
|
}
|
|
for _, p := range ptrarr {
|
|
printintpointer(p) // ERROR "live at call to printintpointer: autotmp_[0-9]+ autotmp_[0-9]+$"
|
|
}
|
|
for _, p := range ptrarr {
|
|
printintpointer(p) // ERROR "live at call to printintpointer: autotmp_[0-9]+ autotmp_[0-9]+$"
|
|
}
|
|
}
|
|
|
|
// 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 convT2E: autotmp_[0-9]+ autotmp_[0-9]+$" "live at call to h31: autotmp_[0-9]+$" "live at call to newobject: 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 to \(\*T32\).Inc: t$"
|
|
*t++
|
|
}
|
|
|
|
var t32 T32
|
|
|
|
func f32(b bool) {
|
|
if b {
|
|
call32(t32.Inc) // ERROR "live at call to call32: autotmp_[0-9]+$"
|
|
}
|
|
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]+$"
|
|
printnl()
|
|
return
|
|
} else {
|
|
printnl()
|
|
}
|
|
printnl()
|
|
}
|
|
|
|
func f34() {
|
|
if m33[nil] == 0 { // ERROR "live at call to mapaccess1: autotmp_[0-9]+$"
|
|
printnl()
|
|
return
|
|
}
|
|
printnl()
|
|
}
|
|
|
|
func f35() {
|
|
if m33[nil] == 0 && m33[nil] == 0 { // ERROR "live at call to mapaccess1: autotmp_[0-9]+$"
|
|
printnl()
|
|
return
|
|
}
|
|
printnl()
|
|
}
|
|
|
|
func f36() {
|
|
if m33[nil] == 0 || m33[nil] == 0 { // ERROR "live at call to mapaccess1: autotmp_[0-9]+$"
|
|
printnl()
|
|
return
|
|
}
|
|
printnl()
|
|
}
|
|
|
|
func f37() {
|
|
if (m33[nil] == 0 || m33[nil] == 0) && m33[nil] == 0 { // ERROR "live at call to mapaccess1: autotmp_[0-9]+$"
|
|
printnl()
|
|
return
|
|
}
|
|
printnl()
|
|
}
|
|
|
|
// select temps should disappear in the case bodies
|
|
|
|
var c38 chan string
|
|
|
|
func fc38() chan string
|
|
func fi38(int) *string
|
|
func fb38() *bool
|
|
|
|
func f38(b bool) {
|
|
// we don't care what temps are printed on the lines with output.
|
|
// we care that the println lines have no live variables
|
|
// and therefore no output.
|
|
if b {
|
|
select { // ERROR "live at call to newselect: autotmp_[0-9]+ autotmp_[0-9]+ autotmp_[0-9]+ autotmp_[0-9]+ autotmp_[0-9]+ autotmp_[0-9]+ autotmp_[0-9]+ autotmp_[0-9]+$" "live at call to selectgo: autotmp_[0-9]+ autotmp_[0-9]+ autotmp_[0-9]+ autotmp_[0-9]+ autotmp_[0-9]+ autotmp_[0-9]+ autotmp_[0-9]+$"
|
|
case <-fc38(): // ERROR "live at call to selectrecv: autotmp_[0-9]+ autotmp_[0-9]+ autotmp_[0-9]+ autotmp_[0-9]+ autotmp_[0-9]+ autotmp_[0-9]+ autotmp_[0-9]+$"
|
|
printnl()
|
|
case fc38() <- *fi38(1): // ERROR "live at call to fc38: autotmp_[0-9]+$" "live at call to fi38: autotmp_[0-9]+ autotmp_[0-9]+$" "live at call to selectsend: autotmp_[0-9]+ autotmp_[0-9]+ autotmp_[0-9]+ autotmp_[0-9]+ autotmp_[0-9]+ autotmp_[0-9]+ autotmp_[0-9]+$"
|
|
printnl()
|
|
case *fi38(2) = <-fc38(): // ERROR "live at call to fc38: autotmp_[0-9]+ autotmp_[0-9]+ autotmp_[0-9]+$" "live at call to fi38: autotmp_[0-9]+ autotmp_[0-9]+ autotmp_[0-9]+$" "live at call to selectrecv: autotmp_[0-9]+ autotmp_[0-9]+ autotmp_[0-9]+ autotmp_[0-9]+ autotmp_[0-9]+ autotmp_[0-9]+ autotmp_[0-9]+$"
|
|
printnl()
|
|
case *fi38(3), *fb38() = <-fc38(): // ERROR "live at call to fb38: autotmp_[0-9]+ autotmp_[0-9]+ autotmp_[0-9]+$" "live at call to fc38: autotmp_[0-9]+ autotmp_[0-9]+ autotmp_[0-9]+ autotmp_[0-9]+ autotmp_[0-9]+$" "live at call to fi38: autotmp_[0-9]+ autotmp_[0-9]+ autotmp_[0-9]+$" "live at call to selectrecv2: autotmp_[0-9]+ autotmp_[0-9]+ autotmp_[0-9]+ autotmp_[0-9]+ autotmp_[0-9]+ autotmp_[0-9]+ autotmp_[0-9]+$"
|
|
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
|
|
}
|
|
|
|
func newT40() *T40 {
|
|
ret := T40{}
|
|
ret.m = make(map[int]int) // ERROR "live at call to makemap: &ret$"
|
|
return &ret
|
|
}
|
|
|
|
func bad40() {
|
|
t := newT40()
|
|
_ = t
|
|
printnl()
|
|
}
|
|
|
|
func good40() {
|
|
ret := T40{}
|
|
ret.m = make(map[int]int) // ERROR "live at call to makemap: autotmp_[0-9]+ ret$"
|
|
t := &ret
|
|
printnl() // ERROR "live at call to printnl: autotmp_[0-9]+ ret$"
|
|
_ = t
|
|
}
|