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cmd/compile, cmd/link, reflect, runtime: remove type.zero field

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No longer used after previous hashmap change.

Change-Id: I558470f872281e84a78406132df4e391d077b833
Reviewed-on: https://go-review.googlesource.com/13785
Run-TryBot: Michael Hudson-Doyle <michael.hudson@canonical.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Ian Lance Taylor <iant@golang.org>
This commit is contained in:
Michael Hudson-Doyle 2015-08-21 15:23:57 +12:00 committed by Ian Lance Taylor
parent dc110f245d
commit af78482d6b
4 changed files with 22 additions and 31 deletions
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25
src/cmd/compile/internal/gc/reflect.go
View File

@ -796,11 +796,6 @@ func dcommontype(s *Sym, ot int, t *Type) int {
gcsym, useGCProg, ptrdata := dgcsym(t)
// We use size 0 here so we get the pointer to the zero value,
// but don't allocate space for the zero value unless we need it.
// TODO: how do we get this symbol into bss? We really want
// a read-only bss, but I don't think such a thing exists.
// ../../pkg/reflect/type.go:/^type.commonType
// actual type structure
// type commonType struct {
@ -816,7 +811,6 @@ func dcommontype(s *Sym, ot int, t *Type) int {
// string *string
// *extraType
// ptrToThis *Type
// zero unsafe.Pointer
// }
ot = duintptr(s, ot, uint64(t.Width))
ot = duintptr(s, ot, uint64(ptrdata))
@ -869,7 +863,6 @@ func dcommontype(s *Sym, ot int, t *Type) int {
ot += Widthptr
ot = dsymptr(s, ot, sptr, 0) // ptrto type
ot = duintptr(s, ot, 0) // ptr to zero value (unused)
return ot
}
@ -1052,7 +1045,7 @@ ok:
switch t.Etype {
default:
ot = dcommontype(s, ot, t)
xt = ot - 3*Widthptr
xt = ot - 2*Widthptr
case TARRAY:
if t.Bound >= 0 {
@ -1064,7 +1057,7 @@ ok:
t2.Bound = -1 // slice
s2 := dtypesym(t2)
ot = dcommontype(s, ot, t)
xt = ot - 3*Widthptr
xt = ot - 2*Widthptr
ot = dsymptr(s, ot, s1, 0)
ot = dsymptr(s, ot, s2, 0)
ot = duintptr(s, ot, uint64(t.Bound))
@ -1073,7 +1066,7 @@ ok:
s1 := dtypesym(t.Type)
ot = dcommontype(s, ot, t)
xt = ot - 3*Widthptr
xt = ot - 2*Widthptr
ot = dsymptr(s, ot, s1, 0)
}
@ -1082,7 +1075,7 @@ ok:
s1 := dtypesym(t.Type)
ot = dcommontype(s, ot, t)
xt = ot - 3*Widthptr
xt = ot - 2*Widthptr
ot = dsymptr(s, ot, s1, 0)
ot = duintptr(s, ot, uint64(t.Chan))
@ -1101,7 +1094,7 @@ ok:
}
ot = dcommontype(s, ot, t)
xt = ot - 3*Widthptr
xt = ot - 2*Widthptr
ot = duint8(s, ot, uint8(obj.Bool2int(isddd)))
// two slice headers: in and out.
@ -1140,7 +1133,7 @@ ok:
// ../../runtime/type.go:/InterfaceType
ot = dcommontype(s, ot, t)
xt = ot - 3*Widthptr
xt = ot - 2*Widthptr
ot = dsymptr(s, ot, s, ot+Widthptr+2*Widthint)
ot = duintxx(s, ot, uint64(n), Widthint)
ot = duintxx(s, ot, uint64(n), Widthint)
@ -1160,7 +1153,7 @@ ok:
s3 := dtypesym(mapbucket(t))
s4 := dtypesym(hmap(t))
ot = dcommontype(s, ot, t)
xt = ot - 3*Widthptr
xt = ot - 2*Widthptr
ot = dsymptr(s, ot, s1, 0)
ot = dsymptr(s, ot, s2, 0)
ot = dsymptr(s, ot, s3, 0)
@ -1196,7 +1189,7 @@ ok:
s1 := dtypesym(t.Type)
ot = dcommontype(s, ot, t)
xt = ot - 3*Widthptr
xt = ot - 2*Widthptr
ot = dsymptr(s, ot, s1, 0)
// ../../runtime/type.go:/StructType
@ -1210,7 +1203,7 @@ ok:
}
ot = dcommontype(s, ot, t)
xt = ot - 3*Widthptr
xt = ot - 2*Widthptr
ot = dsymptr(s, ot, s, ot+Widthptr+2*Widthint)
ot = duintxx(s, ot, uint64(n), Widthint)
ot = duintxx(s, ot, uint64(n), Widthint)

2
src/cmd/link/internal/ld/decodesym.go
View File

@ -47,7 +47,7 @@ func decode_inuxi(p []byte, sz int) uint64 {
// commonsize returns the size of the common prefix for all type
// structures (runtime._type).
func commonsize() int {
return 8*Thearch.Ptrsize + 8
return 7*Thearch.Ptrsize + 8
}
// Type.commonType.kind

21
src/reflect/type.go
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@ -247,17 +247,16 @@ const (
type rtype struct {
size uintptr
ptrdata uintptr
hash uint32 // hash of type; avoids computation in hash tables
_ uint8 // unused/padding
align uint8 // alignment of variable with this type
fieldAlign uint8 // alignment of struct field with this type
kind uint8 // enumeration for C
alg *typeAlg // algorithm table
gcdata *byte // garbage collection data
string *string // string form; unnecessary but undeniably useful
*uncommonType // (relatively) uncommon fields
ptrToThis *rtype // type for pointer to this type, if used in binary or has methods
zero unsafe.Pointer // unused
hash uint32 // hash of type; avoids computation in hash tables
_ uint8 // unused/padding
align uint8 // alignment of variable with this type
fieldAlign uint8 // alignment of struct field with this type
kind uint8 // enumeration for C
alg *typeAlg // algorithm table
gcdata *byte // garbage collection data
string *string // string form; unnecessary but undeniably useful
*uncommonType // (relatively) uncommon fields
ptrToThis *rtype // type for pointer to this type, if used in binary or has methods
}
// a copy of runtime.typeAlg

5
src/runtime/type.go
View File

@ -8,8 +8,8 @@ package runtime
import "unsafe"
// Needs to be in sync with ../cmd/internal/ld/decodesym.go:/^func.commonsize,
// ../cmd/internal/gc/reflect.go:/^func.dcommontype and
// Needs to be in sync with ../cmd/compile/internal/ld/decodesym.go:/^func.commonsize,
// ../cmd/compile/internal/gc/reflect.go:/^func.dcommontype and
// ../reflect/type.go:/^type.rtype.
type _type struct {
size uintptr
@ -27,7 +27,6 @@ type _type struct {
_string *string
x *uncommontype
ptrto *_type
zero *byte // unused
}
type method struct {