480 lines
13 KiB
Go
480 lines
13 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 an implementation of proto field accesses using package reflect.
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// It is slower than the code in pointer_unsafe.go but it avoids package unsafe and can
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// be used on App Engine.
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package proto
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import (
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"math"
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"reflect"
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)
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// A structPointer is a pointer to a struct.
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type structPointer struct {
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v reflect.Value
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}
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// toStructPointer returns a structPointer equivalent to the given reflect value.
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// The reflect value must itself be a pointer to a struct.
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func toStructPointer(v reflect.Value) structPointer {
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return structPointer{v}
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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.v.IsNil()
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}
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// Interface returns the struct pointer as an interface value.
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func structPointer_Interface(p structPointer, _ reflect.Type) interface{} {
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return p.v.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 the sequence of field indices
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// passed to reflect's FieldByIndex.
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type field []int
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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 f.Index
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}
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// invalidField is an invalid field identifier.
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var invalidField = field(nil)
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// IsValid reports whether the field identifier is valid.
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func (f field) IsValid() bool { return f != nil }
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// field returns the given field in the struct as a reflect value.
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func structPointer_field(p structPointer, f field) reflect.Value {
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// Special case: an extension map entry with a value of type T
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// passes a *T to the struct-handling code with a zero field,
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// expecting that it will be treated as equivalent to *struct{ X T },
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// which has the same memory layout. We have to handle that case
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// specially, because reflect will panic if we call FieldByIndex on a
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// non-struct.
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if f == nil {
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return p.v.Elem()
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}
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return p.v.Elem().FieldByIndex(f)
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}
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// ifield returns the given field in the struct as an interface value.
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func structPointer_ifield(p structPointer, f field) interface{} {
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return structPointer_field(p, f).Addr().Interface()
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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 structPointer_ifield(p, f).(*[]byte)
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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 structPointer_ifield(p, f).(*[][]byte)
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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 structPointer_ifield(p, f).(**bool)
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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 structPointer_ifield(p, f).(*bool)
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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 structPointer_ifield(p, f).(*[]bool)
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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 structPointer_ifield(p, f).(**string)
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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 structPointer_ifield(p, f).(*string)
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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 structPointer_ifield(p, f).(*[]string)
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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 structPointer_ifield(p, f).(*map[int32]Extension)
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}
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// Map returns the reflect.Value for the address of a map field in the struct.
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func structPointer_Map(p structPointer, f field, typ reflect.Type) reflect.Value {
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return structPointer_field(p, f).Addr()
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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_field(p, f).Set(q.v)
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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{structPointer_field(p, 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{structPointer_field(p, f)}
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}
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// A structPointerSlice represents the address of a slice of pointers to structs
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// (themselves messages or groups). That is, v.Type() is *[]*struct{...}.
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type structPointerSlice struct {
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v reflect.Value
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}
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func (p structPointerSlice) Len() int { return p.v.Len() }
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func (p structPointerSlice) Index(i int) structPointer { return structPointer{p.v.Index(i)} }
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func (p structPointerSlice) Append(q structPointer) {
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p.v.Set(reflect.Append(p.v, q.v))
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}
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var (
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int32Type = reflect.TypeOf(int32(0))
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uint32Type = reflect.TypeOf(uint32(0))
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float32Type = reflect.TypeOf(float32(0))
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int64Type = reflect.TypeOf(int64(0))
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uint64Type = reflect.TypeOf(uint64(0))
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float64Type = reflect.TypeOf(float64(0))
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)
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// A word32 represents a field of type *int32, *uint32, *float32, or *enum.
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// That is, v.Type() is *int32, *uint32, *float32, or *enum and v is assignable.
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type word32 struct {
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v reflect.Value
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}
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// IsNil reports whether p is nil.
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func word32_IsNil(p word32) bool {
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return p.v.IsNil()
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}
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// Set sets p to point at a newly allocated word with bits set to x.
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func word32_Set(p word32, o *Buffer, x uint32) {
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t := p.v.Type().Elem()
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switch t {
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case int32Type:
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if len(o.int32s) == 0 {
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o.int32s = make([]int32, uint32PoolSize)
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}
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o.int32s[0] = int32(x)
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p.v.Set(reflect.ValueOf(&o.int32s[0]))
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o.int32s = o.int32s[1:]
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return
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case uint32Type:
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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.v.Set(reflect.ValueOf(&o.uint32s[0]))
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o.uint32s = o.uint32s[1:]
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return
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case float32Type:
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if len(o.float32s) == 0 {
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o.float32s = make([]float32, uint32PoolSize)
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}
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o.float32s[0] = math.Float32frombits(x)
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p.v.Set(reflect.ValueOf(&o.float32s[0]))
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o.float32s = o.float32s[1:]
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return
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}
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// must be enum
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p.v.Set(reflect.New(t))
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p.v.Elem().SetInt(int64(int32(x)))
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}
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// Get gets the bits pointed at by p, as a uint32.
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func word32_Get(p word32) uint32 {
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elem := p.v.Elem()
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switch elem.Kind() {
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case reflect.Int32:
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return uint32(elem.Int())
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case reflect.Uint32:
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return uint32(elem.Uint())
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case reflect.Float32:
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return math.Float32bits(float32(elem.Float()))
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}
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panic("unreachable")
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}
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// Word32 returns a reference to 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{structPointer_field(p, f)}
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}
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// A word32Val represents a field of type int32, uint32, float32, or enum.
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// That is, v.Type() is int32, uint32, float32, or enum and v is assignable.
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type word32Val struct {
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v reflect.Value
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}
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// Set sets *p to x.
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func word32Val_Set(p word32Val, x uint32) {
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switch p.v.Type() {
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case int32Type:
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p.v.SetInt(int64(x))
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return
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case uint32Type:
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p.v.SetUint(uint64(x))
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return
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case float32Type:
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p.v.SetFloat(float64(math.Float32frombits(x)))
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return
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}
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// must be enum
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p.v.SetInt(int64(int32(x)))
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}
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// Get gets the bits pointed at by p, as a uint32.
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func word32Val_Get(p word32Val) uint32 {
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elem := p.v
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switch elem.Kind() {
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case reflect.Int32:
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return uint32(elem.Int())
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case reflect.Uint32:
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return uint32(elem.Uint())
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case reflect.Float32:
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return math.Float32bits(float32(elem.Float()))
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}
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panic("unreachable")
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}
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// Word32Val returns a reference to 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{structPointer_field(p, f)}
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}
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// A word32Slice is a slice of 32-bit values.
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// That is, v.Type() is []int32, []uint32, []float32, or []enum.
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type word32Slice struct {
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v reflect.Value
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}
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func (p word32Slice) Append(x uint32) {
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n, m := p.v.Len(), p.v.Cap()
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if n < m {
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p.v.SetLen(n + 1)
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} else {
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t := p.v.Type().Elem()
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p.v.Set(reflect.Append(p.v, reflect.Zero(t)))
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}
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elem := p.v.Index(n)
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switch elem.Kind() {
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case reflect.Int32:
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elem.SetInt(int64(int32(x)))
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case reflect.Uint32:
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elem.SetUint(uint64(x))
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case reflect.Float32:
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elem.SetFloat(float64(math.Float32frombits(x)))
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}
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}
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func (p word32Slice) Len() int {
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return p.v.Len()
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}
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func (p word32Slice) Index(i int) uint32 {
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elem := p.v.Index(i)
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switch elem.Kind() {
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case reflect.Int32:
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return uint32(elem.Int())
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case reflect.Uint32:
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return uint32(elem.Uint())
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case reflect.Float32:
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return math.Float32bits(float32(elem.Float()))
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}
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panic("unreachable")
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}
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// Word32Slice returns a reference to 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{structPointer_field(p, f)}
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}
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// word64 is like word32 but for 64-bit values.
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type word64 struct {
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v reflect.Value
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}
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func word64_Set(p word64, o *Buffer, x uint64) {
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t := p.v.Type().Elem()
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switch t {
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case int64Type:
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if len(o.int64s) == 0 {
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o.int64s = make([]int64, uint64PoolSize)
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}
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o.int64s[0] = int64(x)
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p.v.Set(reflect.ValueOf(&o.int64s[0]))
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o.int64s = o.int64s[1:]
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return
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case uint64Type:
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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.v.Set(reflect.ValueOf(&o.uint64s[0]))
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o.uint64s = o.uint64s[1:]
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return
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case float64Type:
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if len(o.float64s) == 0 {
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o.float64s = make([]float64, uint64PoolSize)
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}
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o.float64s[0] = math.Float64frombits(x)
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p.v.Set(reflect.ValueOf(&o.float64s[0]))
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o.float64s = o.float64s[1:]
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return
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}
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panic("unreachable")
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}
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func word64_IsNil(p word64) bool {
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return p.v.IsNil()
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}
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func word64_Get(p word64) uint64 {
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elem := p.v.Elem()
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switch elem.Kind() {
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case reflect.Int64:
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return uint64(elem.Int())
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case reflect.Uint64:
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return elem.Uint()
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case reflect.Float64:
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return math.Float64bits(elem.Float())
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}
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panic("unreachable")
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}
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func structPointer_Word64(p structPointer, f field) word64 {
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return word64{structPointer_field(p, f)}
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}
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// word64Val is like word32Val but for 64-bit values.
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type word64Val struct {
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v reflect.Value
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}
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func word64Val_Set(p word64Val, o *Buffer, x uint64) {
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switch p.v.Type() {
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case int64Type:
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p.v.SetInt(int64(x))
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return
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case uint64Type:
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p.v.SetUint(x)
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return
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case float64Type:
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p.v.SetFloat(math.Float64frombits(x))
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return
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}
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panic("unreachable")
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}
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func word64Val_Get(p word64Val) uint64 {
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elem := p.v
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switch elem.Kind() {
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case reflect.Int64:
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return uint64(elem.Int())
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case reflect.Uint64:
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return elem.Uint()
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case reflect.Float64:
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return math.Float64bits(elem.Float())
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}
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panic("unreachable")
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}
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func structPointer_Word64Val(p structPointer, f field) word64Val {
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return word64Val{structPointer_field(p, f)}
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}
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type word64Slice struct {
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v reflect.Value
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}
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func (p word64Slice) Append(x uint64) {
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n, m := p.v.Len(), p.v.Cap()
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if n < m {
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p.v.SetLen(n + 1)
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} else {
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t := p.v.Type().Elem()
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p.v.Set(reflect.Append(p.v, reflect.Zero(t)))
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}
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elem := p.v.Index(n)
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switch elem.Kind() {
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case reflect.Int64:
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elem.SetInt(int64(int64(x)))
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case reflect.Uint64:
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elem.SetUint(uint64(x))
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case reflect.Float64:
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elem.SetFloat(float64(math.Float64frombits(x)))
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}
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}
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func (p word64Slice) Len() int {
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return p.v.Len()
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}
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func (p word64Slice) Index(i int) uint64 {
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elem := p.v.Index(i)
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switch elem.Kind() {
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case reflect.Int64:
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return uint64(elem.Int())
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case reflect.Uint64:
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return uint64(elem.Uint())
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case reflect.Float64:
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return math.Float64bits(float64(elem.Float()))
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}
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panic("unreachable")
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}
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func structPointer_Word64Slice(p structPointer, f field) word64Slice {
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return word64Slice{structPointer_field(p, f)}
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}
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