107 lines
3.8 KiB
Go
107 lines
3.8 KiB
Go
// Protocol Buffers for Go with Gadgets
|
|
//
|
|
// Copyright (c) 2013, The GoGo Authors. All rights reserved.
|
|
// http://github.com/gogo/protobuf
|
|
//
|
|
// Redistribution and use in source and binary forms, with or without
|
|
// modification, are permitted provided that the following conditions are
|
|
// met:
|
|
//
|
|
// * Redistributions of source code must retain the above copyright
|
|
// notice, this list of conditions and the following disclaimer.
|
|
// * Redistributions in binary form must reproduce the above
|
|
// copyright notice, this list of conditions and the following disclaimer
|
|
// in the documentation and/or other materials provided with the
|
|
// distribution.
|
|
//
|
|
// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
|
|
// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
|
|
// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
|
|
// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
|
|
// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
|
|
// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
|
|
// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
|
|
// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
|
|
// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
|
|
// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
|
|
// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
|
|
|
|
// +build !appengine
|
|
|
|
// This file contains the implementation of the proto field accesses using package unsafe.
|
|
|
|
package proto
|
|
|
|
import (
|
|
"reflect"
|
|
"unsafe"
|
|
)
|
|
|
|
func structPointer_InterfaceAt(p structPointer, f field, t reflect.Type) interface{} {
|
|
point := unsafe.Pointer(uintptr(p) + uintptr(f))
|
|
r := reflect.NewAt(t, point)
|
|
return r.Interface()
|
|
}
|
|
|
|
func structPointer_InterfaceRef(p structPointer, f field, t reflect.Type) interface{} {
|
|
point := unsafe.Pointer(uintptr(p) + uintptr(f))
|
|
r := reflect.NewAt(t, point)
|
|
if r.Elem().IsNil() {
|
|
return nil
|
|
}
|
|
return r.Elem().Interface()
|
|
}
|
|
|
|
func copyUintPtr(oldptr, newptr uintptr, size int) {
|
|
oldbytes := make([]byte, 0)
|
|
oldslice := (*reflect.SliceHeader)(unsafe.Pointer(&oldbytes))
|
|
oldslice.Data = oldptr
|
|
oldslice.Len = size
|
|
oldslice.Cap = size
|
|
newbytes := make([]byte, 0)
|
|
newslice := (*reflect.SliceHeader)(unsafe.Pointer(&newbytes))
|
|
newslice.Data = newptr
|
|
newslice.Len = size
|
|
newslice.Cap = size
|
|
copy(newbytes, oldbytes)
|
|
}
|
|
|
|
func structPointer_Copy(oldptr structPointer, newptr structPointer, size int) {
|
|
copyUintPtr(uintptr(oldptr), uintptr(newptr), size)
|
|
}
|
|
|
|
func appendStructPointer(base structPointer, f field, typ reflect.Type) structPointer {
|
|
size := typ.Elem().Size()
|
|
|
|
oldHeader := structPointer_GetSliceHeader(base, f)
|
|
oldSlice := reflect.NewAt(typ, unsafe.Pointer(oldHeader)).Elem()
|
|
newLen := oldHeader.Len + 1
|
|
newSlice := reflect.MakeSlice(typ, newLen, newLen)
|
|
reflect.Copy(newSlice, oldSlice)
|
|
bas := toStructPointer(newSlice)
|
|
oldHeader.Data = uintptr(bas)
|
|
oldHeader.Len = newLen
|
|
oldHeader.Cap = newLen
|
|
|
|
return structPointer(unsafe.Pointer(uintptr(unsafe.Pointer(bas)) + uintptr(uintptr(newLen-1)*size)))
|
|
}
|
|
|
|
func structPointer_FieldPointer(p structPointer, f field) structPointer {
|
|
return structPointer(unsafe.Pointer(uintptr(p) + uintptr(f)))
|
|
}
|
|
|
|
func structPointer_GetRefStructPointer(p structPointer, f field) structPointer {
|
|
return structPointer((*structPointer)(unsafe.Pointer(uintptr(p) + uintptr(f))))
|
|
}
|
|
|
|
func structPointer_GetSliceHeader(p structPointer, f field) *reflect.SliceHeader {
|
|
return (*reflect.SliceHeader)(unsafe.Pointer(uintptr(p) + uintptr(f)))
|
|
}
|
|
|
|
func structPointer_Add(p structPointer, size field) structPointer {
|
|
return structPointer(unsafe.Pointer(uintptr(p) + uintptr(size)))
|
|
}
|
|
|
|
func structPointer_Len(p structPointer, f field) int {
|
|
return len(*(*[]interface{})(unsafe.Pointer(structPointer_GetRefStructPointer(p, f))))
|
|
}
|