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cmd/compile: mark temps with new AutoTemp flag, and use it.

Browse Source 
This is an extension of
https://go-review.googlesource.com/c/31662/
to mark all the temporaries, not just the ssa-generated ones.

Before-and-after ls -l `go tool -n compile` shows a 3%
reduction in size (or rather, a prior 3% inflation for
failing to filter temps out properly.)

Replaced name-dependent "is it a temp?" tests with calls to
*Node.IsAutoTmp(), which depends on AutoTemp.  Also replace
calls to istemp(n) with n.IsAutoTmp(), to reduce duplication
and clean up function name space.  Generated temporaries
now come with a "." prefix to avoid (apparently harmless)
clashes with legal Go variable names.

Fixes #17644.
Fixes #17240.

Change-Id: If1417f29c79a7275d7303ddf859b51472890fd43
Reviewed-on: https://go-review.googlesource.com/32255
Run-TryBot: David Chase <drchase@google.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Matthew Dempsky <mdempsky@google.com>
This commit is contained in:
David Chase 2016-10-28 13:33:57 -04:00
parent eec1e5d9c6
commit 9c066bab64
14 changed files with 125 additions and 118 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

11
src/cmd/compile/internal/gc/gen.go
View File

@ -115,6 +115,11 @@ func moveToHeap(n *Node) {
heapaddr.Sym = lookup("&" + n.Sym.Name)
heapaddr.Orig.Sym = heapaddr.Sym
// Unset AutoTemp to persist the &foo variable name through SSA to
// liveness analysis.
// TODO(mdempsky/drchase): Cleaner solution?
heapaddr.Name.AutoTemp = false
// Parameters have a local stack copy used at function start/end
// in addition to the copy in the heap that may live longer than
// the function.
@ -192,8 +197,9 @@ func tempname(nn *Node, t *Type) {
}
// give each tmp a different name so that there
// a chance to registerizer them
s := lookupN("autotmp_", statuniqgen)
// a chance to registerizer them.
// Add a preceding . to avoid clash with legal names.
s := lookupN(".autotmp_", statuniqgen)
statuniqgen++
n := nod(ONAME, nil, nil)
n.Sym = s
@ -204,6 +210,7 @@ func tempname(nn *Node, t *Type) {
n.Ullman = 1
n.Esc = EscNever
n.Name.Curfn = Curfn
n.Name.AutoTemp = true
Curfn.Func.Dcl = append(Curfn.Func.Dcl, n)
dowidth(t)

19
src/cmd/compile/internal/gc/order.go
View File

@ -6,7 +6,6 @@ package gc
import (
"fmt"
"strings"
)
// Rewrite tree to use separate statements to enforce
@ -170,14 +169,6 @@ func ordersafeexpr(n *Node, order *Order) *Node {
}
}
// Istemp reports whether n is a temporary variable.
func istemp(n *Node) bool {
if n.Op != ONAME {
return false
}
return strings.HasPrefix(n.Sym.Name, "autotmp_")
}
// Isaddrokay reports whether it is okay to pass n's address to runtime routines.
// Taking the address of a variable makes the liveness and optimization analyses
// lose track of where the variable's lifetime ends. To avoid hurting the analyses
@ -185,7 +176,7 @@ func istemp(n *Node) bool {
// because we emit explicit VARKILL instructions marking the end of those
// temporaries' lifetimes.
func isaddrokay(n *Node) bool {
return islvalue(n) && (n.Op != ONAME || n.Class == PEXTERN || istemp(n))
return islvalue(n) && (n.Op != ONAME || n.Class == PEXTERN || n.IsAutoTmp())
}
// Orderaddrtemp ensures that n is okay to pass by address to runtime routines.
@ -438,10 +429,10 @@ func ordermapassign(n *Node, order *Order) {
for i1, n1 := range n.List.Slice() {
if n1.Op == OINDEXMAP {
m = n1
if !istemp(m.Left) {
if !m.Left.IsAutoTmp() {
m.Left = ordercopyexpr(m.Left, m.Left.Type, order, 0)
}
if !istemp(m.Right) {
if !m.Right.IsAutoTmp() {
m.Right = ordercopyexpr(m.Right, m.Right.Type, order, 0)
}
n.List.SetIndex(i1, ordertemp(m.Type, order, false))
@ -902,11 +893,11 @@ func orderstmt(n *Node, order *Order) {
// r->left is c, r->right is x, both are always evaluated.
r.Left = orderexpr(r.Left, order, nil)
if !istemp(r.Left) {
if !r.Left.IsAutoTmp() {
r.Left = ordercopyexpr(r.Left, r.Left.Type, order, 0)
}
r.Right = orderexpr(r.Right, order, nil)
if !istemp(r.Right) {
if !r.Right.IsAutoTmp() {
r.Right = ordercopyexpr(r.Right, r.Right.Type, order, 0)
}
}

3
src/cmd/compile/internal/gc/pgen.go
View File

@ -422,6 +422,9 @@ func compile(fn *Node) {
}
fallthrough
case PPARAM, PPARAMOUT:
if n.IsAutoTmp() { // skip debugging info for temporaries
continue
}
p := Gins(obj.ATYPE, n, nil)
p.From.Sym = obj.Linklookup(Ctxt, n.Sym.Name, 0)
p.To.Type = obj.TYPE_MEM

2
src/cmd/compile/internal/gc/racewalk.go
View File

@ -437,7 +437,7 @@ func isartificial(n *Node) bool {
}
// autotmp's are always local
if strings.HasPrefix(n.Sym.Name, "autotmp_") {
if n.IsAutoTmp() {
return true
}

6
src/cmd/compile/internal/gc/ssa.go
View File

@ -9,7 +9,6 @@ import (
"fmt"
"html"
"os"
"strings"
"cmd/compile/internal/ssa"
"cmd/internal/obj"
@ -3987,8 +3986,8 @@ func (s *state) addNamedValue(n *Node, v *ssa.Value) {
// Don't track our dummy nodes (&memVar etc.).
return
}
if strings.HasPrefix(n.Sym.Name, "autotmp_") {
// Don't track autotmp_ variables.
if n.IsAutoTmp() {
// Don't track temporary variables.
return
}
if n.Class == PPARAMOUT {
@ -4569,6 +4568,7 @@ func (e *ssaExport) SplitStruct(name ssa.LocalSlot, i int) ssa.LocalSlot {
}
// namedAuto returns a new AUTO variable with the given name and type.
// These are exposed to the debugger.
func (e *ssaExport) namedAuto(name string, typ ssa.Type) ssa.GCNode {
t := typ.(*Type)
s := &Sym{Name: name, Pkg: localpkg}

10
src/cmd/compile/internal/gc/syntax.go
View File

@ -72,6 +72,15 @@ type Node struct {
flags uint8 // TODO: store more bool fields in this flag field
}
// IsAutoTmp indicates if n was created by the compiler as a temporary,
// based on the setting of the .AutoTemp flag in n's Name.
func (n *Node) IsAutoTmp() bool {
if n == nil || n.Op != ONAME {
return false
}
return n.Name.AutoTemp
}
const (
hasBreak = 1 << iota
isClosureVar
@ -188,6 +197,7 @@ type Name struct {
Byval bool // is the variable captured by value or by reference
Needzero bool // if it contains pointers, needs to be zeroed on function entry
Keepalive bool // mark value live across unknown assembly call
AutoTemp bool // is the variable a temporary (implies no dwarf info. reset if escapes to heap)
}
type Param struct {

2
src/cmd/compile/internal/gc/typecheck.go
View File

@ -1966,7 +1966,7 @@ OpSwitch:
typecheckas(n)
// Code that creates temps does not bother to set defn, so do it here.
if n.Left.Op == ONAME && strings.HasPrefix(n.Left.Sym.Name, "autotmp_") {
if n.Left.Op == ONAME && n.Left.IsAutoTmp() {
n.Left.Name.Defn = n
}
break OpSwitch

2
src/cmd/compile/internal/gc/walk.go
View File

@ -2208,7 +2208,7 @@ func isstack(n *Node) bool {
// If n is *autotmp and autotmp = &foo, replace n with foo.
// We introduce such temps when initializing struct literals.
if n.Op == OIND && n.Left.Op == ONAME && strings.HasPrefix(n.Left.Sym.Name, "autotmp_") {
if n.Op == OIND && n.Left.Op == ONAME && n.Left.IsAutoTmp() {
defn := n.Left.Name.Defn
if defn != nil && defn.Op == OAS && defn.Right.Op == OADDR {
n = defn.Right.Left

4
src/cmd/internal/dwarf/dwarf.go
View File

@ -9,7 +9,6 @@ package dwarf
import (
"fmt"
"strings"
)
// InfoPrefix is the prefix for all the symbols containing DWARF info entries.
@ -577,9 +576,6 @@ func PutFunc(ctxt Context, s Sym, name string, external bool, startPC Sym, size
putattr(ctxt, s, DW_ABRV_FUNCTION, DW_FORM_flag, DW_CLS_FLAG, ev, 0)
names := make(map[string]bool)
for v := vars; v != nil; v = v.Link {
if strings.Contains(v.Name, ".autotmp_") {
continue
}
var n string
if names[v.Name] {
n = fmt.Sprintf("%s#%d", v.Name, len(names))

6
test/fixedbugs/issue15747.go
View File

@ -17,14 +17,14 @@ type T struct{ M string }
var b bool
func f1(q *Q, xx []byte) interface{} { // ERROR "live at entry to f1: xx" "live at call to newobject: xx" "live at call to writebarrierptr: &xx"
func f1(q *Q, xx []byte) interface{} { // ERROR "live at call to newobject: xx$" "live at call to writebarrierptr: &xx$" "live at entry to f1: xx$"
// xx was copied from the stack to the heap on the previous line:
// xx was live for the first two prints but then it switched to &xx
// being live. We should not see plain xx again.
if b {
global = &xx // ERROR "live at call to writebarrierptr: &xx$"
}
xx, _, err := f2(xx, 5) // ERROR "live at call to writebarrierptr: err.data err.type$" "live at call to f2: &xx$"
xx, _, err := f2(xx, 5) // ERROR "live at call to f2: &xx$" "live at call to writebarrierptr: err.data err.type$"
if err != nil {
return err
}
@ -32,7 +32,7 @@ func f1(q *Q, xx []byte) interface{} { // ERROR "live at entry to f1: xx" "live
}
//go:noinline
func f2(d []byte, n int) (odata, res []byte, e interface{}) { // ERROR "live at entry to f2: d"
func f2(d []byte, n int) (odata, res []byte, e interface{}) { // ERROR "live at entry to f2: d$"
if n > len(d) {
return d, nil, &T{M: "hello"} // ERROR "live at call to newobject: d" "live at call to writebarrierptr: d"
}

160
test/live.go
View File

@ -162,10 +162,10 @@ 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_[0-9]+$" "live at call to selectgo: autotmp_[0-9]+$"
case <-c: // ERROR "live at call to selectrecv: autotmp_[0-9]+$"
select { // ERROR "live at call to newselect: .autotmp_[0-9]+$" "live at call to selectgo: .autotmp_[0-9]+$"
case <-c: // ERROR "live at call to selectrecv: .autotmp_[0-9]+$"
return nil
case <-c: // ERROR "live at call to selectrecv: autotmp_[0-9]+$"
case <-c: // ERROR "live at call to selectrecv: .autotmp_[0-9]+$"
return nil
}
}
@ -177,10 +177,10 @@ func f11b() *int {
// 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 "live at call to newselect: autotmp_[0-9]+$" "live at call to selectgo: autotmp_[0-9]+$"
case <-c: // ERROR "live at call to selectrecv: autotmp_[0-9]+$"
select { // ERROR "live at call to newselect: .autotmp_[0-9]+$" "live at call to selectgo: .autotmp_[0-9]+$"
case <-c: // ERROR "live at call to selectrecv: .autotmp_[0-9]+$"
return nil
case <-c: // ERROR "live at call to selectrecv: autotmp_[0-9]+$"
case <-c: // ERROR "live at call to selectrecv: .autotmp_[0-9]+$"
return nil
}
}
@ -197,9 +197,9 @@ func f11c() *int {
// 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$"
select { // ERROR "live at call to newselect: autotmp_[0-9]+ p$" "live at call to selectgo: autotmp_[0-9]+ p$"
case <-c: // ERROR "live at call to selectrecv: autotmp_[0-9]+ p$"
case <-c: // ERROR "live at call to selectrecv: autotmp_[0-9]+ p$"
select { // ERROR "live at call to newselect: .autotmp_[0-9]+ p$" "live at call to selectgo: .autotmp_[0-9]+ p$"
case <-c: // ERROR "live at call to selectrecv: .autotmp_[0-9]+ p$"
case <-c: // ERROR "live at call to selectrecv: .autotmp_[0-9]+ p$"
}
}
println(*p)
@ -257,10 +257,10 @@ var m map[string]int
func f16() {
if b {
delete(m, "hi") // ERROR "live at call to mapdelete: autotmp_[0-9]+$"
delete(m, "hi") // ERROR "live at call to mapdelete: .autotmp_[0-9]+$"
}
delete(m, "hi") // ERROR "live at call to mapdelete: autotmp_[0-9]+$"
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]+$"
}
var m2s map[string]*byte
@ -279,19 +279,19 @@ func f17a(p *byte) { // ERROR "live at entry to f17a: p$"
func f17b(p *byte) { // ERROR "live at entry to f17b: p$"
// key temporary
if b {
m2s["x"] = p // ERROR "live at call to mapassign: p autotmp_[0-9]+$"
m2s["x"] = p // ERROR "live at call to mapassign: p .autotmp_[0-9]+$"
}
m2s["x"] = p // ERROR "live at call to mapassign: p autotmp_[0-9]+$"
m2s["x"] = p // ERROR "live at call to mapassign: p autotmp_[0-9]+$"
m2s["x"] = p // ERROR "live at call to mapassign: p .autotmp_[0-9]+$"
m2s["x"] = p // ERROR "live at call to mapassign: p .autotmp_[0-9]+$"
}
func f17c() {
// key and value temporaries
if b {
m2s["x"] = f17d() // ERROR "live at call to f17d: autotmp_[0-9]+$" "live at call to mapassign: autotmp_[0-9]+ autotmp_[0-9]+$"
m2s["x"] = f17d() // ERROR "live at call to f17d: .autotmp_[0-9]+$" "live at call to mapassign: .autotmp_[0-9]+ .autotmp_[0-9]+$"
}
m2s["x"] = f17d() // ERROR "live at call to f17d: autotmp_[0-9]+$" "live at call to mapassign: autotmp_[0-9]+ autotmp_[0-9]+$"
m2s["x"] = f17d() // ERROR "live at call to f17d: autotmp_[0-9]+$" "live at call to mapassign: autotmp_[0-9]+ autotmp_[0-9]+$"
m2s["x"] = f17d() // ERROR "live at call to f17d: .autotmp_[0-9]+$" "live at call to mapassign: .autotmp_[0-9]+ .autotmp_[0-9]+$"
m2s["x"] = f17d() // ERROR "live at call to f17d: .autotmp_[0-9]+$" "live at call to mapassign: .autotmp_[0-9]+ .autotmp_[0-9]+$"
}
func f17d() *byte
@ -303,10 +303,10 @@ func f18() {
// temporary introduced by orderexpr.
var z *byte
if b {
z = m2[g18()] // ERROR "live at call to mapaccess1: autotmp_[0-9]+$"
z = m2[g18()] // ERROR "live at call to mapaccess1: .autotmp_[0-9]+$"
}
z = m2[g18()] // ERROR "live at call to mapaccess1: autotmp_[0-9]+$"
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]+$"
printbytepointer(z)
}
@ -317,30 +317,30 @@ func f19() {
var z *byte
if b {
z = <-ch // ERROR "live at call to chanrecv1: autotmp_[0-9]+$"
z = <-ch // ERROR "live at call to chanrecv1: .autotmp_[0-9]+$"
}
z = <-ch // ERROR "live at call to chanrecv1: autotmp_[0-9]+$"
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]+$"
printbytepointer(z)
}
func f20() {
// src temporary for channel send
if b {
ch <- nil // ERROR "live at call to chansend1: autotmp_[0-9]+$"
ch <- nil // ERROR "live at call to chansend1: .autotmp_[0-9]+$"
}
ch <- nil // ERROR "live at call to chansend1: autotmp_[0-9]+$"
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]+$"
}
z = m2[[2]string{"x", "y"}] // ERROR "live at call to mapaccess1: autotmp_[0-9]+$"
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]+$"
printbytepointer(z)
}
@ -349,10 +349,10 @@ func f23() {
var z *byte
var ok bool
if b {
z, ok = m2[[2]string{"x", "y"}] // ERROR "live at call to mapaccess2: autotmp_[0-9]+$"
z, ok = m2[[2]string{"x", "y"}] // ERROR "live at call to mapaccess2: .autotmp_[0-9]+$"
}
z, ok = m2[[2]string{"x", "y"}] // ERROR "live at call to mapaccess2: autotmp_[0-9]+$"
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]+$"
printbytepointer(z)
print(ok)
}
@ -361,10 +361,10 @@ func f24() {
// key temporary for map access using array literal key.
// value temporary too.
if b {
m2[[2]string{"x", "y"}] = nil // ERROR "live at call to mapassign: autotmp_[0-9]+$"
m2[[2]string{"x", "y"}] = nil // ERROR "live at call to mapassign: .autotmp_[0-9]+$"
}
m2[[2]string{"x", "y"}] = nil // ERROR "live at call to mapassign: autotmp_[0-9]+$"
m2[[2]string{"x", "y"}] = nil // ERROR "live at call to mapassign: autotmp_[0-9]+$"
m2[[2]string{"x", "y"}] = nil // ERROR "live at call to mapassign: .autotmp_[0-9]+$"
m2[[2]string{"x", "y"}] = nil // ERROR "live at call to mapassign: .autotmp_[0-9]+$"
}
// defer should not cause spurious ambiguously live variables
@ -388,10 +388,10 @@ func g25()
func f26(b bool) {
if b {
print26((*int)(nil), (*int)(nil), (*int)(nil)) // ERROR "live at call to print26: autotmp_[0-9]+$"
print26((*int)(nil), (*int)(nil), (*int)(nil)) // ERROR "live at call to print26: .autotmp_[0-9]+$"
}
print26((*int)(nil), (*int)(nil), (*int)(nil)) // ERROR "live at call to print26: autotmp_[0-9]+$"
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]+$"
printnl()
}
@ -403,10 +403,10 @@ func print26(...interface{})
func f27(b bool) {
x := 0
if b {
call27(func() { x++ }) // ERROR "live at call to call27: autotmp_[0-9]+$"
call27(func() { x++ }) // ERROR "live at call to call27: .autotmp_[0-9]+$"
}
call27(func() { x++ }) // ERROR "live at call to call27: autotmp_[0-9]+$"
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]+$"
printnl()
}
@ -415,11 +415,11 @@ func f27(b bool) {
func f27defer(b bool) {
x := 0
if b {
defer call27(func() { x++ }) // ERROR "live at call to deferproc: autotmp_[0-9]+$" "live at call to deferreturn: autotmp_[0-9]+$"
defer call27(func() { x++ }) // ERROR "live at call to deferproc: .autotmp_[0-9]+$" "live at call to deferreturn: .autotmp_[0-9]+$"
}
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]+$"
printnl() // ERROR "live at call to printnl: autotmp_[0-9]+ autotmp_[0-9]+$"
} // ERROR "live at call to deferreturn: autotmp_[0-9]+ autotmp_[0-9]+$"
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]+$"
printnl() // ERROR "live at call to printnl: .autotmp_[0-9]+ .autotmp_[0-9]+$"
} // ERROR "live at call to deferreturn: .autotmp_[0-9]+ .autotmp_[0-9]+$"
// and newproc (go) escapes to the heap
@ -441,25 +441,25 @@ var s1, s2, s3, s4, s5, s6, s7, s8, s9, s10 string
func f28(b bool) {
if b {
printstring(s1 + s2 + s3 + s4 + s5 + s6 + s7 + s8 + s9 + s10) // ERROR "live at call to concatstrings: autotmp_[0-9]+$" "live at call to printstring: autotmp_[0-9]+$"
printstring(s1 + s2 + s3 + s4 + s5 + s6 + s7 + s8 + s9 + s10) // ERROR "live at call to concatstrings: .autotmp_[0-9]+$" "live at call to printstring: .autotmp_[0-9]+$"
}
printstring(s1 + s2 + s3 + s4 + s5 + s6 + s7 + s8 + s9 + s10) // ERROR "live at call to concatstrings: autotmp_[0-9]+$" "live at call to printstring: autotmp_[0-9]+$"
printstring(s1 + s2 + s3 + s4 + s5 + s6 + s7 + s8 + s9 + s10) // ERROR "live at call to concatstrings: autotmp_[0-9]+$" "live at call to printstring: autotmp_[0-9]+$"
printstring(s1 + s2 + s3 + s4 + s5 + s6 + s7 + s8 + s9 + s10) // ERROR "live at call to concatstrings: .autotmp_[0-9]+$" "live at call to printstring: .autotmp_[0-9]+$"
printstring(s1 + s2 + s3 + s4 + s5 + s6 + s7 + s8 + s9 + s10) // ERROR "live at call to concatstrings: .autotmp_[0-9]+$" "live at call to printstring: .autotmp_[0-9]+$"
}
// map iterator should die on end of range loop
func f29(b bool) {
if b {
for k := range m { // ERROR "live at call to mapiterinit: autotmp_[0-9]+$" "live at call to mapiternext: autotmp_[0-9]+$"
printstring(k) // ERROR "live at call to printstring: autotmp_[0-9]+$"
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]+$"
printstring(k) // ERROR "live at call to printstring: autotmp_[0-9]+$"
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]+$"
printstring(k) // ERROR "live at call to printstring: autotmp_[0-9]+$"
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]+$"
}
}
@ -472,14 +472,14 @@ func f30(b bool) {
// the copy of ptrarr and the internal iterator pointer.
if b {
for _, p := range ptrarr {
printintpointer(p) // ERROR "live at call to printintpointer: autotmp_[0-9]+ autotmp_[0-9]+$"
printintpointer(p) // ERROR "live at call to printintpointer: .autotmp_[0-9]+ .autotmp_[0-9]+$"
}
}
for _, p := range ptrarr {
printintpointer(p) // ERROR "live at call to printintpointer: autotmp_[0-9]+ autotmp_[0-9]+$"
printintpointer(p) // ERROR "live at call to printintpointer: .autotmp_[0-9]+ .autotmp_[0-9]+$"
}
for _, p := range ptrarr {
printintpointer(p) // ERROR "live at call to printintpointer: autotmp_[0-9]+ autotmp_[0-9]+$"
printintpointer(p) // ERROR "live at call to printintpointer: .autotmp_[0-9]+ .autotmp_[0-9]+$"
}
}
@ -487,13 +487,13 @@ func f30(b bool) {
func f31(b1, b2, b3 bool) {
if b1 {
g31("a") // ERROR "live at call to convT2E: autotmp_[0-9]+$" "live at call to g31: autotmp_[0-9]+$"
g31("a") // ERROR "live at call to convT2E: .autotmp_[0-9]+$" "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]+$" "live at call to newobject: autotmp_[0-9]+$"
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]+$"
panic("asdf") // ERROR "live at call to convT2E: .autotmp_[0-9]+$" "live at call to gopanic: .autotmp_[0-9]+$"
}
print(b3)
}
@ -513,10 +513,10 @@ var t32 T32
func f32(b bool) {
if b {
call32(t32.Inc) // ERROR "live at call to call32: autotmp_[0-9]+$"
call32(t32.Inc) // ERROR "live at call to call32: .autotmp_[0-9]+$"
}
call32(t32.Inc) // ERROR "live at call to call32: autotmp_[0-9]+$"
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]+$"
}
//go:noescape
@ -528,7 +528,7 @@ func call32(func())
var m33 map[interface{}]int
func f33() {
if m33[nil] == 0 { // ERROR "live at call to mapaccess1: autotmp_[0-9]+$"
if m33[nil] == 0 { // ERROR "live at call to mapaccess1: .autotmp_[0-9]+$"
printnl()
return
} else {
@ -538,7 +538,7 @@ func f33() {
}
func f34() {
if m33[nil] == 0 { // ERROR "live at call to mapaccess1: autotmp_[0-9]+$"
if m33[nil] == 0 { // ERROR "live at call to mapaccess1: .autotmp_[0-9]+$"
printnl()
return
}
@ -546,7 +546,7 @@ func f34() {
}
func f35() {
if m33[nil] == 0 && m33[nil] == 0 { // ERROR "live at call to mapaccess1: autotmp_[0-9]+$"
if m33[nil] == 0 && m33[nil] == 0 { // ERROR "live at call to mapaccess1: .autotmp_[0-9]+$"
printnl()
return
}
@ -554,7 +554,7 @@ func f35() {
}
func f36() {
if m33[nil] == 0 || m33[nil] == 0 { // ERROR "live at call to mapaccess1: autotmp_[0-9]+$"
if m33[nil] == 0 || m33[nil] == 0 { // ERROR "live at call to mapaccess1: .autotmp_[0-9]+$"
printnl()
return
}
@ -562,7 +562,7 @@ func f36() {
}
func f37() {
if (m33[nil] == 0 || m33[nil] == 0) && m33[nil] == 0 { // ERROR "live at call to mapaccess1: autotmp_[0-9]+$"
if (m33[nil] == 0 || m33[nil] == 0) && m33[nil] == 0 { // ERROR "live at call to mapaccess1: .autotmp_[0-9]+$"
printnl()
return
}
@ -582,14 +582,14 @@ func f38(b bool) {
// we care that the println lines have no live variables
// and therefore no output.
if b {
select { // ERROR "live at call to newselect: autotmp_[0-9]+ autotmp_[0-9]+ autotmp_[0-9]+ autotmp_[0-9]+ autotmp_[0-9]+ autotmp_[0-9]+ autotmp_[0-9]+ autotmp_[0-9]+$" "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]+$"
case <-fc38(): // ERROR "live at call to selectrecv: autotmp_[0-9]+ autotmp_[0-9]+ autotmp_[0-9]+ autotmp_[0-9]+ autotmp_[0-9]+ autotmp_[0-9]+ autotmp_[0-9]+$"
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]+$" "live at call to selectsend: autotmp_[0-9]+ autotmp_[0-9]+ autotmp_[0-9]+ autotmp_[0-9]+ autotmp_[0-9]+ autotmp_[0-9]+ autotmp_[0-9]+$"
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]+$" "live at call to selectrecv: autotmp_[0-9]+ autotmp_[0-9]+ autotmp_[0-9]+ autotmp_[0-9]+ autotmp_[0-9]+ autotmp_[0-9]+ autotmp_[0-9]+$"
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]+$"
case *fi38(3), *fb38() = <-fc38(): // ERROR "live at call to fb38: .autotmp_[0-9]+ .autotmp_[0-9]+ .autotmp_[0-9]+$" "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]+$"
printnl()
}
printnl()
@ -601,13 +601,13 @@ func f38(b bool) {
func f39() (x []int) {
x = []int{1}
printnl() // ERROR "live at call to printnl: autotmp_[0-9]+$"
printnl() // ERROR "live at call to printnl: .autotmp_[0-9]+$"
return x
}
func f39a() (x []int) {
x = []int{1}
printnl() // ERROR "live at call to printnl: autotmp_[0-9]+$"
printnl() // ERROR "live at call to printnl: .autotmp_[0-9]+$"
return
}
@ -646,16 +646,16 @@ func bad40() {
func good40() {
ret := T40{}
ret.m = make(map[int]int) // ERROR "live at call to makemap: autotmp_[0-9]+ ret$"
ret.m = make(map[int]int) // ERROR "live at call to makemap: .autotmp_[0-9]+ ret$"
t := &ret
printnl() // ERROR "live at call to printnl: autotmp_[0-9]+ ret$"
printnl() // ERROR "live at call to printnl: .autotmp_[0-9]+ ret$"
_ = t
}
func ddd1(x, y *int) { // ERROR "live at entry to ddd1: x y$"
ddd2(x, y) // ERROR "live at call to ddd2: autotmp_[0-9]+$"
ddd2(x, y) // ERROR "live at call to ddd2: .autotmp_[0-9]+$"
printnl()
// Note: no autotmp live at printnl. See issue 16996.
// Note: no .?autotmp live at printnl. See issue 16996.
}
func ddd2(a ...*int) { // ERROR "live at entry to ddd2: a$"
sink = a[0]

10
test/live2.go
View File

@ -20,20 +20,20 @@ type T40 struct {
func newT40() *T40 {
ret := T40{}
ret.m = make(map[int]int) // ERROR "live at call to makemap: &ret"
ret.m = make(map[int]int) // ERROR "live at call to makemap: &ret$"
return &ret
}
func bad40() {
t := newT40() // ERROR "live at call to makemap: autotmp_.* ret"
printnl() // ERROR "live at call to printnl: autotmp_.* ret"
t := newT40() // ERROR "live at call to makemap: .autotmp_[0-9]+ ret$"
printnl() // ERROR "live at call to printnl: .autotmp_[0-9]+ ret$"
_ = t
}
func good40() {
ret := T40{}
ret.m = make(map[int]int) // ERROR "live at call to makemap: autotmp_.* ret"
ret.m = make(map[int]int) // ERROR "live at call to makemap: .autotmp_[0-9]+ ret$"
t := &ret
printnl() // ERROR "live at call to printnl: autotmp_.* ret"
printnl() // ERROR "live at call to printnl: .autotmp_[0-9]+ ret$"
_ = t
}

4
test/live_syscall.go
View File

@ -19,10 +19,10 @@ func f(uintptr) // ERROR "f assuming arg#1 is unsafe uintptr"
func g() {
var t int
f(uintptr(unsafe.Pointer(&t))) // ERROR "live at call to f: autotmp" "g &t does not escape"
f(uintptr(unsafe.Pointer(&t))) // ERROR "live at call to f: .?autotmp" "g &t does not escape"
}
func h() {
var v int
syscall.Syscall(0, 1, uintptr(unsafe.Pointer(&v)), 2) // ERROR "live at call to Syscall: autotmp" "h &v does not escape"
syscall.Syscall(0, 1, uintptr(unsafe.Pointer(&v)), 2) // ERROR "live at call to Syscall: .?autotmp" "h &v does not escape"
}

4
test/uintptrescapes2.go
View File

@ -22,10 +22,10 @@ func F2(a ...uintptr) {} // ERROR "escaping ...uintptr" "a does not escape"
func G() {
var t int // ERROR "moved to heap"
F1(uintptr(unsafe.Pointer(&t))) // ERROR "live at call to F1: autotmp" "&t escapes to heap"
F1(uintptr(unsafe.Pointer(&t))) // ERROR "live at call to F1: .?autotmp" "&t escapes to heap"
}
func H() {
var v int // ERROR "moved to heap"
F2(0, 1, uintptr(unsafe.Pointer(&v)), 2) // ERROR "live at call to newobject: autotmp" "live at call to F2: autotmp" "escapes to heap"
F2(0, 1, uintptr(unsafe.Pointer(&v)), 2) // ERROR "live at call to newobject: .?autotmp" "live at call to F2: .?autotmp" "escapes to heap"
}