mirror of
https://gitea.com/Lydanne/buildx.git
synced 2025-11-01 00:23:56 +08:00
655 lines
17 KiB
Go
655 lines
17 KiB
Go
// Go support for Protocol Buffers - Google's data interchange format
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//
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// Copyright 2016 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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package proto
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import (
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"fmt"
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"reflect"
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"strings"
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"sync"
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"sync/atomic"
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)
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// Merge merges the src message into dst.
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// This assumes that dst and src of the same type and are non-nil.
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func (a *InternalMessageInfo) Merge(dst, src Message) {
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mi := atomicLoadMergeInfo(&a.merge)
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if mi == nil {
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mi = getMergeInfo(reflect.TypeOf(dst).Elem())
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atomicStoreMergeInfo(&a.merge, mi)
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}
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mi.merge(toPointer(&dst), toPointer(&src))
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}
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type mergeInfo struct {
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typ reflect.Type
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initialized int32 // 0: only typ is valid, 1: everything is valid
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lock sync.Mutex
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fields []mergeFieldInfo
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unrecognized field // Offset of XXX_unrecognized
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}
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type mergeFieldInfo struct {
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field field // Offset of field, guaranteed to be valid
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// isPointer reports whether the value in the field is a pointer.
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// This is true for the following situations:
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// * Pointer to struct
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// * Pointer to basic type (proto2 only)
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// * Slice (first value in slice header is a pointer)
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// * String (first value in string header is a pointer)
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isPointer bool
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// basicWidth reports the width of the field assuming that it is directly
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// embedded in the struct (as is the case for basic types in proto3).
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// The possible values are:
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// 0: invalid
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// 1: bool
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// 4: int32, uint32, float32
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// 8: int64, uint64, float64
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basicWidth int
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// Where dst and src are pointers to the types being merged.
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merge func(dst, src pointer)
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}
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var (
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mergeInfoMap = map[reflect.Type]*mergeInfo{}
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mergeInfoLock sync.Mutex
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)
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func getMergeInfo(t reflect.Type) *mergeInfo {
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mergeInfoLock.Lock()
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defer mergeInfoLock.Unlock()
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mi := mergeInfoMap[t]
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if mi == nil {
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mi = &mergeInfo{typ: t}
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mergeInfoMap[t] = mi
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}
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return mi
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}
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// merge merges src into dst assuming they are both of type *mi.typ.
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func (mi *mergeInfo) merge(dst, src pointer) {
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if dst.isNil() {
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panic("proto: nil destination")
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}
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if src.isNil() {
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return // Nothing to do.
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}
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if atomic.LoadInt32(&mi.initialized) == 0 {
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mi.computeMergeInfo()
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}
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for _, fi := range mi.fields {
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sfp := src.offset(fi.field)
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// As an optimization, we can avoid the merge function call cost
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// if we know for sure that the source will have no effect
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// by checking if it is the zero value.
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if unsafeAllowed {
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if fi.isPointer && sfp.getPointer().isNil() { // Could be slice or string
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continue
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}
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if fi.basicWidth > 0 {
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switch {
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case fi.basicWidth == 1 && !*sfp.toBool():
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continue
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case fi.basicWidth == 4 && *sfp.toUint32() == 0:
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continue
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case fi.basicWidth == 8 && *sfp.toUint64() == 0:
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continue
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}
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}
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}
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dfp := dst.offset(fi.field)
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fi.merge(dfp, sfp)
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}
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// TODO: Make this faster?
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out := dst.asPointerTo(mi.typ).Elem()
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in := src.asPointerTo(mi.typ).Elem()
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if emIn, err := extendable(in.Addr().Interface()); err == nil {
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emOut, _ := extendable(out.Addr().Interface())
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mIn, muIn := emIn.extensionsRead()
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if mIn != nil {
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mOut := emOut.extensionsWrite()
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muIn.Lock()
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mergeExtension(mOut, mIn)
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muIn.Unlock()
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}
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}
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if mi.unrecognized.IsValid() {
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if b := *src.offset(mi.unrecognized).toBytes(); len(b) > 0 {
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*dst.offset(mi.unrecognized).toBytes() = append([]byte(nil), b...)
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}
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}
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}
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func (mi *mergeInfo) computeMergeInfo() {
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mi.lock.Lock()
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defer mi.lock.Unlock()
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if mi.initialized != 0 {
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return
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}
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t := mi.typ
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n := t.NumField()
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props := GetProperties(t)
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for i := 0; i < n; i++ {
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f := t.Field(i)
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if strings.HasPrefix(f.Name, "XXX_") {
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continue
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}
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mfi := mergeFieldInfo{field: toField(&f)}
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tf := f.Type
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// As an optimization, we can avoid the merge function call cost
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// if we know for sure that the source will have no effect
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// by checking if it is the zero value.
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if unsafeAllowed {
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switch tf.Kind() {
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case reflect.Ptr, reflect.Slice, reflect.String:
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// As a special case, we assume slices and strings are pointers
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// since we know that the first field in the SliceSlice or
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// StringHeader is a data pointer.
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mfi.isPointer = true
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case reflect.Bool:
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mfi.basicWidth = 1
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case reflect.Int32, reflect.Uint32, reflect.Float32:
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mfi.basicWidth = 4
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case reflect.Int64, reflect.Uint64, reflect.Float64:
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mfi.basicWidth = 8
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}
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}
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// Unwrap tf to get at its most basic type.
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var isPointer, isSlice bool
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if tf.Kind() == reflect.Slice && tf.Elem().Kind() != reflect.Uint8 {
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isSlice = true
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tf = tf.Elem()
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}
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if tf.Kind() == reflect.Ptr {
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isPointer = true
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tf = tf.Elem()
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}
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if isPointer && isSlice && tf.Kind() != reflect.Struct {
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panic("both pointer and slice for basic type in " + tf.Name())
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}
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switch tf.Kind() {
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case reflect.Int32:
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switch {
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case isSlice: // E.g., []int32
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mfi.merge = func(dst, src pointer) {
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// NOTE: toInt32Slice is not defined (see pointer_reflect.go).
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/*
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sfsp := src.toInt32Slice()
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if *sfsp != nil {
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dfsp := dst.toInt32Slice()
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*dfsp = append(*dfsp, *sfsp...)
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if *dfsp == nil {
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*dfsp = []int64{}
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}
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}
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*/
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sfs := src.getInt32Slice()
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if sfs != nil {
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dfs := dst.getInt32Slice()
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dfs = append(dfs, sfs...)
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if dfs == nil {
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dfs = []int32{}
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}
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dst.setInt32Slice(dfs)
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}
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}
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case isPointer: // E.g., *int32
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mfi.merge = func(dst, src pointer) {
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// NOTE: toInt32Ptr is not defined (see pointer_reflect.go).
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/*
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sfpp := src.toInt32Ptr()
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if *sfpp != nil {
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dfpp := dst.toInt32Ptr()
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if *dfpp == nil {
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*dfpp = Int32(**sfpp)
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} else {
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**dfpp = **sfpp
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}
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}
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*/
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sfp := src.getInt32Ptr()
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if sfp != nil {
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dfp := dst.getInt32Ptr()
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if dfp == nil {
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dst.setInt32Ptr(*sfp)
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} else {
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*dfp = *sfp
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}
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}
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}
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default: // E.g., int32
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mfi.merge = func(dst, src pointer) {
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if v := *src.toInt32(); v != 0 {
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*dst.toInt32() = v
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}
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}
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}
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case reflect.Int64:
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switch {
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case isSlice: // E.g., []int64
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mfi.merge = func(dst, src pointer) {
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sfsp := src.toInt64Slice()
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if *sfsp != nil {
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dfsp := dst.toInt64Slice()
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*dfsp = append(*dfsp, *sfsp...)
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if *dfsp == nil {
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*dfsp = []int64{}
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}
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}
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}
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case isPointer: // E.g., *int64
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mfi.merge = func(dst, src pointer) {
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sfpp := src.toInt64Ptr()
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if *sfpp != nil {
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dfpp := dst.toInt64Ptr()
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if *dfpp == nil {
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*dfpp = Int64(**sfpp)
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} else {
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**dfpp = **sfpp
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}
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}
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}
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default: // E.g., int64
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mfi.merge = func(dst, src pointer) {
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if v := *src.toInt64(); v != 0 {
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*dst.toInt64() = v
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}
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}
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}
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case reflect.Uint32:
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switch {
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case isSlice: // E.g., []uint32
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mfi.merge = func(dst, src pointer) {
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sfsp := src.toUint32Slice()
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if *sfsp != nil {
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dfsp := dst.toUint32Slice()
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*dfsp = append(*dfsp, *sfsp...)
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if *dfsp == nil {
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*dfsp = []uint32{}
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}
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}
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}
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case isPointer: // E.g., *uint32
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mfi.merge = func(dst, src pointer) {
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sfpp := src.toUint32Ptr()
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if *sfpp != nil {
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dfpp := dst.toUint32Ptr()
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if *dfpp == nil {
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*dfpp = Uint32(**sfpp)
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} else {
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**dfpp = **sfpp
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}
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}
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}
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default: // E.g., uint32
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mfi.merge = func(dst, src pointer) {
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if v := *src.toUint32(); v != 0 {
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*dst.toUint32() = v
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}
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}
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}
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case reflect.Uint64:
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switch {
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case isSlice: // E.g., []uint64
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mfi.merge = func(dst, src pointer) {
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sfsp := src.toUint64Slice()
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if *sfsp != nil {
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dfsp := dst.toUint64Slice()
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*dfsp = append(*dfsp, *sfsp...)
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if *dfsp == nil {
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*dfsp = []uint64{}
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}
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}
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}
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case isPointer: // E.g., *uint64
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mfi.merge = func(dst, src pointer) {
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sfpp := src.toUint64Ptr()
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if *sfpp != nil {
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dfpp := dst.toUint64Ptr()
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if *dfpp == nil {
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*dfpp = Uint64(**sfpp)
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} else {
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**dfpp = **sfpp
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}
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}
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}
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default: // E.g., uint64
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mfi.merge = func(dst, src pointer) {
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if v := *src.toUint64(); v != 0 {
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*dst.toUint64() = v
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}
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}
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}
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case reflect.Float32:
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switch {
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case isSlice: // E.g., []float32
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mfi.merge = func(dst, src pointer) {
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sfsp := src.toFloat32Slice()
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if *sfsp != nil {
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dfsp := dst.toFloat32Slice()
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*dfsp = append(*dfsp, *sfsp...)
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if *dfsp == nil {
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*dfsp = []float32{}
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}
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}
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}
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case isPointer: // E.g., *float32
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mfi.merge = func(dst, src pointer) {
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sfpp := src.toFloat32Ptr()
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if *sfpp != nil {
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dfpp := dst.toFloat32Ptr()
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if *dfpp == nil {
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*dfpp = Float32(**sfpp)
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} else {
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**dfpp = **sfpp
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}
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}
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}
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default: // E.g., float32
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mfi.merge = func(dst, src pointer) {
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if v := *src.toFloat32(); v != 0 {
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*dst.toFloat32() = v
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}
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}
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}
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case reflect.Float64:
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switch {
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case isSlice: // E.g., []float64
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mfi.merge = func(dst, src pointer) {
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sfsp := src.toFloat64Slice()
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if *sfsp != nil {
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dfsp := dst.toFloat64Slice()
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*dfsp = append(*dfsp, *sfsp...)
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if *dfsp == nil {
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*dfsp = []float64{}
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}
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}
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}
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case isPointer: // E.g., *float64
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mfi.merge = func(dst, src pointer) {
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sfpp := src.toFloat64Ptr()
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if *sfpp != nil {
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dfpp := dst.toFloat64Ptr()
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if *dfpp == nil {
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*dfpp = Float64(**sfpp)
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} else {
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**dfpp = **sfpp
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}
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}
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}
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default: // E.g., float64
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mfi.merge = func(dst, src pointer) {
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if v := *src.toFloat64(); v != 0 {
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*dst.toFloat64() = v
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}
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}
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}
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case reflect.Bool:
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switch {
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case isSlice: // E.g., []bool
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mfi.merge = func(dst, src pointer) {
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sfsp := src.toBoolSlice()
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if *sfsp != nil {
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dfsp := dst.toBoolSlice()
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*dfsp = append(*dfsp, *sfsp...)
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if *dfsp == nil {
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*dfsp = []bool{}
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}
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}
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}
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case isPointer: // E.g., *bool
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mfi.merge = func(dst, src pointer) {
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sfpp := src.toBoolPtr()
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if *sfpp != nil {
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dfpp := dst.toBoolPtr()
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if *dfpp == nil {
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*dfpp = Bool(**sfpp)
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} else {
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**dfpp = **sfpp
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}
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}
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}
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default: // E.g., bool
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mfi.merge = func(dst, src pointer) {
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if v := *src.toBool(); v {
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*dst.toBool() = v
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}
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}
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}
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case reflect.String:
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switch {
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case isSlice: // E.g., []string
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mfi.merge = func(dst, src pointer) {
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sfsp := src.toStringSlice()
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if *sfsp != nil {
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dfsp := dst.toStringSlice()
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*dfsp = append(*dfsp, *sfsp...)
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if *dfsp == nil {
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*dfsp = []string{}
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}
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}
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}
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case isPointer: // E.g., *string
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mfi.merge = func(dst, src pointer) {
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sfpp := src.toStringPtr()
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if *sfpp != nil {
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dfpp := dst.toStringPtr()
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if *dfpp == nil {
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*dfpp = String(**sfpp)
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} else {
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**dfpp = **sfpp
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}
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}
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}
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default: // E.g., string
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mfi.merge = func(dst, src pointer) {
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if v := *src.toString(); v != "" {
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*dst.toString() = v
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}
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}
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}
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case reflect.Slice:
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isProto3 := props.Prop[i].proto3
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switch {
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case isPointer:
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panic("bad pointer in byte slice case in " + tf.Name())
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case tf.Elem().Kind() != reflect.Uint8:
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panic("bad element kind in byte slice case in " + tf.Name())
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case isSlice: // E.g., [][]byte
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mfi.merge = func(dst, src pointer) {
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sbsp := src.toBytesSlice()
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if *sbsp != nil {
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dbsp := dst.toBytesSlice()
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for _, sb := range *sbsp {
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if sb == nil {
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*dbsp = append(*dbsp, nil)
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} else {
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*dbsp = append(*dbsp, append([]byte{}, sb...))
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}
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}
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if *dbsp == nil {
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*dbsp = [][]byte{}
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}
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}
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}
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default: // E.g., []byte
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mfi.merge = func(dst, src pointer) {
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sbp := src.toBytes()
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if *sbp != nil {
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dbp := dst.toBytes()
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if !isProto3 || len(*sbp) > 0 {
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*dbp = append([]byte{}, *sbp...)
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}
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}
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}
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}
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case reflect.Struct:
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switch {
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case !isPointer:
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panic(fmt.Sprintf("message field %s without pointer", tf))
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case isSlice: // E.g., []*pb.T
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mi := getMergeInfo(tf)
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mfi.merge = func(dst, src pointer) {
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sps := src.getPointerSlice()
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if sps != nil {
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dps := dst.getPointerSlice()
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for _, sp := range sps {
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var dp pointer
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|
if !sp.isNil() {
|
|
dp = valToPointer(reflect.New(tf))
|
|
mi.merge(dp, sp)
|
|
}
|
|
dps = append(dps, dp)
|
|
}
|
|
if dps == nil {
|
|
dps = []pointer{}
|
|
}
|
|
dst.setPointerSlice(dps)
|
|
}
|
|
}
|
|
default: // E.g., *pb.T
|
|
mi := getMergeInfo(tf)
|
|
mfi.merge = func(dst, src pointer) {
|
|
sp := src.getPointer()
|
|
if !sp.isNil() {
|
|
dp := dst.getPointer()
|
|
if dp.isNil() {
|
|
dp = valToPointer(reflect.New(tf))
|
|
dst.setPointer(dp)
|
|
}
|
|
mi.merge(dp, sp)
|
|
}
|
|
}
|
|
}
|
|
case reflect.Map:
|
|
switch {
|
|
case isPointer || isSlice:
|
|
panic("bad pointer or slice in map case in " + tf.Name())
|
|
default: // E.g., map[K]V
|
|
mfi.merge = func(dst, src pointer) {
|
|
sm := src.asPointerTo(tf).Elem()
|
|
if sm.Len() == 0 {
|
|
return
|
|
}
|
|
dm := dst.asPointerTo(tf).Elem()
|
|
if dm.IsNil() {
|
|
dm.Set(reflect.MakeMap(tf))
|
|
}
|
|
|
|
switch tf.Elem().Kind() {
|
|
case reflect.Ptr: // Proto struct (e.g., *T)
|
|
for _, key := range sm.MapKeys() {
|
|
val := sm.MapIndex(key)
|
|
val = reflect.ValueOf(Clone(val.Interface().(Message)))
|
|
dm.SetMapIndex(key, val)
|
|
}
|
|
case reflect.Slice: // E.g. Bytes type (e.g., []byte)
|
|
for _, key := range sm.MapKeys() {
|
|
val := sm.MapIndex(key)
|
|
val = reflect.ValueOf(append([]byte{}, val.Bytes()...))
|
|
dm.SetMapIndex(key, val)
|
|
}
|
|
default: // Basic type (e.g., string)
|
|
for _, key := range sm.MapKeys() {
|
|
val := sm.MapIndex(key)
|
|
dm.SetMapIndex(key, val)
|
|
}
|
|
}
|
|
}
|
|
}
|
|
case reflect.Interface:
|
|
// Must be oneof field.
|
|
switch {
|
|
case isPointer || isSlice:
|
|
panic("bad pointer or slice in interface case in " + tf.Name())
|
|
default: // E.g., interface{}
|
|
// TODO: Make this faster?
|
|
mfi.merge = func(dst, src pointer) {
|
|
su := src.asPointerTo(tf).Elem()
|
|
if !su.IsNil() {
|
|
du := dst.asPointerTo(tf).Elem()
|
|
typ := su.Elem().Type()
|
|
if du.IsNil() || du.Elem().Type() != typ {
|
|
du.Set(reflect.New(typ.Elem())) // Initialize interface if empty
|
|
}
|
|
sv := su.Elem().Elem().Field(0)
|
|
if sv.Kind() == reflect.Ptr && sv.IsNil() {
|
|
return
|
|
}
|
|
dv := du.Elem().Elem().Field(0)
|
|
if dv.Kind() == reflect.Ptr && dv.IsNil() {
|
|
dv.Set(reflect.New(sv.Type().Elem())) // Initialize proto message if empty
|
|
}
|
|
switch sv.Type().Kind() {
|
|
case reflect.Ptr: // Proto struct (e.g., *T)
|
|
Merge(dv.Interface().(Message), sv.Interface().(Message))
|
|
case reflect.Slice: // E.g. Bytes type (e.g., []byte)
|
|
dv.Set(reflect.ValueOf(append([]byte{}, sv.Bytes()...)))
|
|
default: // Basic type (e.g., string)
|
|
dv.Set(sv)
|
|
}
|
|
}
|
|
}
|
|
}
|
|
default:
|
|
panic(fmt.Sprintf("merger not found for type:%s", tf))
|
|
}
|
|
mi.fields = append(mi.fields, mfi)
|
|
}
|
|
|
|
mi.unrecognized = invalidField
|
|
if f, ok := t.FieldByName("XXX_unrecognized"); ok {
|
|
if f.Type != reflect.TypeOf([]byte{}) {
|
|
panic("expected XXX_unrecognized to be of type []byte")
|
|
}
|
|
mi.unrecognized = toField(&f)
|
|
}
|
|
|
|
atomic.StoreInt32(&mi.initialized, 1)
|
|
}
|