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better code for allocation through indirection

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R=rsc
DELTA=11  (3 added, 5 deleted, 3 changed)
OCL=35583
CL=35583
This commit is contained in:
Rob Pike 2009-10-11 18:07:47 -07:00
parent 330ab5fddb
commit c0e0f82e49
1 changed files with 6 additions and 8 deletions
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14
src/pkg/gob/decode.go
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@ -355,18 +355,16 @@ type decEngine struct {
} }
func decodeStruct(engine *decEngine, rtyp *reflect.StructType, b *bytes.Buffer, p uintptr, indir int) os.Error { func decodeStruct(engine *decEngine, rtyp *reflect.StructType, b *bytes.Buffer, p uintptr, indir int) os.Error {
for ; indir > 0; indir-- { if indir > 0 {
up := unsafe.Pointer(p); up := unsafe.Pointer(p);
if indir > 1 {
up = decIndirect(up, indir)
}
if *(*unsafe.Pointer)(up) == nil { if *(*unsafe.Pointer)(up) == nil {
// Allocate object by making a slice of bytes and recording the // Allocate object by making a slice of bytes and recording the
// address of the beginning of the array. TODO(rsc). // address of the beginning of the array. TODO(rsc).
if indir > 1 { // allocate a pointer b := make([]byte, rtyp.Size());
b := make([]byte, unsafe.Sizeof((*int)(nil))); *(*unsafe.Pointer)(up) = unsafe.Pointer(&b[0]);
*(*unsafe.Pointer)(up) = unsafe.Pointer(&b[0]);
} else { // allocate a struct
b := make([]byte, rtyp.Size());
*(*unsafe.Pointer)(up) = unsafe.Pointer(&b[0]);
}
} }
p = *(*uintptr)(up); p = *(*uintptr)(up);
} }