267 lines
9.1 KiB
Go
267 lines
9.1 KiB
Go
// Go support for Protocol Buffers - Google's data interchange format
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//
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// Copyright 2012 The Go Authors. All rights reserved.
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// https://github.com/golang/protobuf
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//
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// Redistribution and use in source and binary forms, with or without
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// modification, are permitted provided that the following conditions are
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// met:
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//
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// * Redistributions of source code must retain the above copyright
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// notice, this list of conditions and the following disclaimer.
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// * Redistributions in binary form must reproduce the above
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// copyright notice, this list of conditions and the following disclaimer
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// in the documentation and/or other materials provided with the
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// distribution.
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// * Neither the name of Google Inc. nor the names of its
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// contributors may be used to endorse or promote products derived from
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// this software without specific prior written permission.
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//
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// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
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// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
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// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
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// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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// +build !appengine
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// This file contains the implementation of the proto field accesses using package unsafe.
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package proto
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import (
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"reflect"
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"unsafe"
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)
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// NOTE: These type_Foo functions would more idiomatically be methods,
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// but Go does not allow methods on pointer types, and we must preserve
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// some pointer type for the garbage collector. We use these
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// funcs with clunky names as our poor approximation to methods.
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//
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// An alternative would be
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// type structPointer struct { p unsafe.Pointer }
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// but that does not registerize as well.
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// A structPointer is a pointer to a struct.
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type structPointer unsafe.Pointer
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// toStructPointer returns a structPointer equivalent to the given reflect value.
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func toStructPointer(v reflect.Value) structPointer {
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return structPointer(unsafe.Pointer(v.Pointer()))
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}
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// IsNil reports whether p is nil.
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func structPointer_IsNil(p structPointer) bool {
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return p == nil
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}
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// Interface returns the struct pointer, assumed to have element type t,
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// as an interface value.
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func structPointer_Interface(p structPointer, t reflect.Type) interface{} {
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return reflect.NewAt(t, unsafe.Pointer(p)).Interface()
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}
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// A field identifies a field in a struct, accessible from a structPointer.
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// In this implementation, a field is identified by its byte offset from the start of the struct.
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type field uintptr
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// toField returns a field equivalent to the given reflect field.
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func toField(f *reflect.StructField) field {
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return field(f.Offset)
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}
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// invalidField is an invalid field identifier.
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const invalidField = ^field(0)
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// IsValid reports whether the field identifier is valid.
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func (f field) IsValid() bool {
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return f != ^field(0)
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}
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// Bytes returns the address of a []byte field in the struct.
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func structPointer_Bytes(p structPointer, f field) *[]byte {
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return (*[]byte)(unsafe.Pointer(uintptr(p) + uintptr(f)))
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}
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// BytesSlice returns the address of a [][]byte field in the struct.
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func structPointer_BytesSlice(p structPointer, f field) *[][]byte {
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return (*[][]byte)(unsafe.Pointer(uintptr(p) + uintptr(f)))
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}
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// Bool returns the address of a *bool field in the struct.
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func structPointer_Bool(p structPointer, f field) **bool {
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return (**bool)(unsafe.Pointer(uintptr(p) + uintptr(f)))
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}
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// BoolVal returns the address of a bool field in the struct.
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func structPointer_BoolVal(p structPointer, f field) *bool {
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return (*bool)(unsafe.Pointer(uintptr(p) + uintptr(f)))
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}
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// BoolSlice returns the address of a []bool field in the struct.
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func structPointer_BoolSlice(p structPointer, f field) *[]bool {
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return (*[]bool)(unsafe.Pointer(uintptr(p) + uintptr(f)))
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}
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// String returns the address of a *string field in the struct.
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func structPointer_String(p structPointer, f field) **string {
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return (**string)(unsafe.Pointer(uintptr(p) + uintptr(f)))
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}
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// StringVal returns the address of a string field in the struct.
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func structPointer_StringVal(p structPointer, f field) *string {
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return (*string)(unsafe.Pointer(uintptr(p) + uintptr(f)))
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}
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// StringSlice returns the address of a []string field in the struct.
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func structPointer_StringSlice(p structPointer, f field) *[]string {
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return (*[]string)(unsafe.Pointer(uintptr(p) + uintptr(f)))
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}
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// ExtMap returns the address of an extension map field in the struct.
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func structPointer_ExtMap(p structPointer, f field) *map[int32]Extension {
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return (*map[int32]Extension)(unsafe.Pointer(uintptr(p) + uintptr(f)))
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}
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// NewAt returns the reflect.Value for a pointer to a field in the struct.
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func structPointer_NewAt(p structPointer, f field, typ reflect.Type) reflect.Value {
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return reflect.NewAt(typ, unsafe.Pointer(uintptr(p)+uintptr(f)))
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}
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// SetStructPointer writes a *struct field in the struct.
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func structPointer_SetStructPointer(p structPointer, f field, q structPointer) {
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*(*structPointer)(unsafe.Pointer(uintptr(p) + uintptr(f))) = q
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}
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// GetStructPointer reads a *struct field in the struct.
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func structPointer_GetStructPointer(p structPointer, f field) structPointer {
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return *(*structPointer)(unsafe.Pointer(uintptr(p) + uintptr(f)))
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}
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// StructPointerSlice the address of a []*struct field in the struct.
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func structPointer_StructPointerSlice(p structPointer, f field) *structPointerSlice {
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return (*structPointerSlice)(unsafe.Pointer(uintptr(p) + uintptr(f)))
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}
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// A structPointerSlice represents a slice of pointers to structs (themselves submessages or groups).
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type structPointerSlice []structPointer
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func (v *structPointerSlice) Len() int { return len(*v) }
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func (v *structPointerSlice) Index(i int) structPointer { return (*v)[i] }
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func (v *structPointerSlice) Append(p structPointer) { *v = append(*v, p) }
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// A word32 is the address of a "pointer to 32-bit value" field.
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type word32 **uint32
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// IsNil reports whether *v is nil.
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func word32_IsNil(p word32) bool {
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return *p == nil
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}
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// Set sets *v to point at a newly allocated word set to x.
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func word32_Set(p word32, o *Buffer, x uint32) {
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if len(o.uint32s) == 0 {
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o.uint32s = make([]uint32, uint32PoolSize)
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}
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o.uint32s[0] = x
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*p = &o.uint32s[0]
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o.uint32s = o.uint32s[1:]
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}
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// Get gets the value pointed at by *v.
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func word32_Get(p word32) uint32 {
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return **p
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}
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// Word32 returns the address of a *int32, *uint32, *float32, or *enum field in the struct.
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func structPointer_Word32(p structPointer, f field) word32 {
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return word32((**uint32)(unsafe.Pointer(uintptr(p) + uintptr(f))))
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}
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// A word32Val is the address of a 32-bit value field.
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type word32Val *uint32
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// Set sets *p to x.
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func word32Val_Set(p word32Val, x uint32) {
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*p = x
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}
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// Get gets the value pointed at by p.
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func word32Val_Get(p word32Val) uint32 {
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return *p
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}
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// Word32Val returns the address of a *int32, *uint32, *float32, or *enum field in the struct.
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func structPointer_Word32Val(p structPointer, f field) word32Val {
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return word32Val((*uint32)(unsafe.Pointer(uintptr(p) + uintptr(f))))
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}
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// A word32Slice is a slice of 32-bit values.
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type word32Slice []uint32
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func (v *word32Slice) Append(x uint32) { *v = append(*v, x) }
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func (v *word32Slice) Len() int { return len(*v) }
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func (v *word32Slice) Index(i int) uint32 { return (*v)[i] }
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// Word32Slice returns the address of a []int32, []uint32, []float32, or []enum field in the struct.
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func structPointer_Word32Slice(p structPointer, f field) *word32Slice {
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return (*word32Slice)(unsafe.Pointer(uintptr(p) + uintptr(f)))
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}
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// word64 is like word32 but for 64-bit values.
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type word64 **uint64
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func word64_Set(p word64, o *Buffer, x uint64) {
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if len(o.uint64s) == 0 {
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o.uint64s = make([]uint64, uint64PoolSize)
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}
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o.uint64s[0] = x
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*p = &o.uint64s[0]
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o.uint64s = o.uint64s[1:]
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}
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func word64_IsNil(p word64) bool {
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return *p == nil
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}
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func word64_Get(p word64) uint64 {
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return **p
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}
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func structPointer_Word64(p structPointer, f field) word64 {
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return word64((**uint64)(unsafe.Pointer(uintptr(p) + uintptr(f))))
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}
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// word64Val is like word32Val but for 64-bit values.
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type word64Val *uint64
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func word64Val_Set(p word64Val, o *Buffer, x uint64) {
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*p = x
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}
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func word64Val_Get(p word64Val) uint64 {
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return *p
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}
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func structPointer_Word64Val(p structPointer, f field) word64Val {
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return word64Val((*uint64)(unsafe.Pointer(uintptr(p) + uintptr(f))))
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}
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// word64Slice is like word32Slice but for 64-bit values.
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type word64Slice []uint64
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func (v *word64Slice) Append(x uint64) { *v = append(*v, x) }
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func (v *word64Slice) Len() int { return len(*v) }
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func (v *word64Slice) Index(i int) uint64 { return (*v)[i] }
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func structPointer_Word64Slice(p structPointer, f field) *word64Slice {
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return (*word64Slice)(unsafe.Pointer(uintptr(p) + uintptr(f)))
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}
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