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runtime: remove unused global variable emptystring

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Last runtime use was removed in https://golang.org/cl/133700043,
September 2014.

Replace plan9 syscall uses with plan9-specific variable.

Change-Id: Ifb910c021c1419a7c782959f90b054ed600d9e19
Reviewed-on: https://go-review.googlesource.com/55450
Reviewed-by: Martin Möhrmann <moehrmann@google.com>
Run-TryBot: Martin Möhrmann <moehrmann@google.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
This commit is contained in:
Ian Lance Taylor 2017-08-14 09:56:51 -07:00
parent 1ee701e857
commit 67b39859ec
5 changed files with 17 additions and 16 deletions
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17
src/runtime/runtime2.go
View File

@ -716,15 +716,14 @@ const (
const _TracebackMaxFrames = 100
var (
emptystring string
allglen uintptr
allm *m
allp [_MaxGomaxprocs + 1]*p
gomaxprocs int32
ncpu int32
forcegc forcegcstate
sched schedt
newprocs int32
allglen uintptr
allm *m
allp [_MaxGomaxprocs + 1]*p
gomaxprocs int32
ncpu int32
forcegc forcegcstate
sched schedt
newprocs int32
// Information about what cpu features are available.
// Set on startup in asm_{386,amd64,amd64p32}.s.

6
src/syscall/asm_plan9_386.s
View File

@ -38,7 +38,7 @@ TEXT ·Syscall(SB),NOSPLIT,$0-32
JMP copyresult3
ok3:
LEAL runtime·emptystring(SB), SI
LEAL ·emptystring(SB), SI
copyresult3:
LEAL err+24(FP), DI
@ -76,7 +76,7 @@ TEXT ·Syscall6(SB),NOSPLIT,$0-44
JMP copyresult4
ok4:
LEAL runtime·emptystring(SB), SI
LEAL ·emptystring(SB), SI
copyresult4:
LEAL err+36(FP), DI
@ -143,7 +143,7 @@ TEXT ·seek(SB),NOSPLIT,$0-36
JMP copyresult6
ok6:
LEAL runtime·emptystring(SB), SI
LEAL ·emptystring(SB), SI
copyresult6:
LEAL err+28(FP), DI

6
src/syscall/asm_plan9_amd64.s
View File

@ -37,7 +37,7 @@ TEXT ·Syscall(SB),NOSPLIT,$0-64
JMP copyresult3
ok3:
LEAQ runtime·emptystring(SB), SI
LEAQ ·emptystring(SB), SI
copyresult3:
LEAQ err+48(FP), DI
@ -75,7 +75,7 @@ TEXT ·Syscall6(SB),NOSPLIT,$0-88
JMP copyresult4
ok4:
LEAQ runtime·emptystring(SB), SI
LEAQ ·emptystring(SB), SI
copyresult4:
LEAQ err+72(FP), DI
@ -141,7 +141,7 @@ TEXT ·seek(SB),NOSPLIT,$0-56
JMP copyresult6
ok6:
LEAQ runtime·emptystring(SB), SI
LEAQ ·emptystring(SB), SI
copyresult6:
LEAQ err+40(FP), DI

2
src/syscall/asm_plan9_arm.s
View File

@ -10,7 +10,7 @@
// System call support for plan9 on arm
TEXT sysresult<>(SB),NOSPLIT,$12
MOVW $runtime·emptystring+0(SB), R2
MOVW $·emptystring+0(SB), R2
CMP $-1, R0
B.NE ok
MOVW R1, save-4(SP)

2
src/syscall/syscall_plan9.go
View File

@ -31,6 +31,8 @@ func (e ErrorString) Timeout() bool {
return e == EBUSY || e == ETIMEDOUT
}
var emptystring string
// A Note is a string describing a process note.
// It implements the os.Signal interface.
type Note string