| // 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,!js |
| |
| // 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)))) |
| } |
| |
| func structPointer_StructRefSlice(p structPointer, f field, size uintptr) *structRefSlice { |
| return &structRefSlice{p: p, f: f, size: size} |
| } |
| |
| // A structRefSlice represents a slice of structs (themselves submessages or groups). |
| type structRefSlice struct { |
| p structPointer |
| f field |
| size uintptr |
| } |
| |
| func (v *structRefSlice) Len() int { |
| return structPointer_Len(v.p, v.f) |
| } |
| |
| func (v *structRefSlice) Index(i int) structPointer { |
| ss := structPointer_GetStructPointer(v.p, v.f) |
| ss1 := structPointer_GetRefStructPointer(ss, 0) |
| return structPointer_Add(ss1, field(uintptr(i)*v.size)) |
| } |