mirror of https://github.com/prometheus/prometheus
129 lines
4.4 KiB
Go
129 lines
4.4 KiB
Go
// Protocol Buffers for Go with Gadgets
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//
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// Copyright (c) 2013, The GoGo Authors. All rights reserved.
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// http://github.com/gogo/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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//
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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,!js
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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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func structPointer_InterfaceAt(p structPointer, f field, t reflect.Type) interface{} {
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point := unsafe.Pointer(uintptr(p) + uintptr(f))
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r := reflect.NewAt(t, point)
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return r.Interface()
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}
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func structPointer_InterfaceRef(p structPointer, f field, t reflect.Type) interface{} {
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point := unsafe.Pointer(uintptr(p) + uintptr(f))
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r := reflect.NewAt(t, point)
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if r.Elem().IsNil() {
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return nil
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}
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return r.Elem().Interface()
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}
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func copyUintPtr(oldptr, newptr uintptr, size int) {
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oldbytes := make([]byte, 0)
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oldslice := (*reflect.SliceHeader)(unsafe.Pointer(&oldbytes))
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oldslice.Data = oldptr
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oldslice.Len = size
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oldslice.Cap = size
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newbytes := make([]byte, 0)
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newslice := (*reflect.SliceHeader)(unsafe.Pointer(&newbytes))
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newslice.Data = newptr
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newslice.Len = size
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newslice.Cap = size
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copy(newbytes, oldbytes)
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}
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func structPointer_Copy(oldptr structPointer, newptr structPointer, size int) {
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copyUintPtr(uintptr(oldptr), uintptr(newptr), size)
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}
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func appendStructPointer(base structPointer, f field, typ reflect.Type) structPointer {
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size := typ.Elem().Size()
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oldHeader := structPointer_GetSliceHeader(base, f)
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oldSlice := reflect.NewAt(typ, unsafe.Pointer(oldHeader)).Elem()
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newLen := oldHeader.Len + 1
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newSlice := reflect.MakeSlice(typ, newLen, newLen)
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reflect.Copy(newSlice, oldSlice)
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bas := toStructPointer(newSlice)
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oldHeader.Data = uintptr(bas)
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oldHeader.Len = newLen
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oldHeader.Cap = newLen
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return structPointer(unsafe.Pointer(uintptr(unsafe.Pointer(bas)) + uintptr(uintptr(newLen-1)*size)))
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}
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func structPointer_FieldPointer(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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func structPointer_GetRefStructPointer(p structPointer, f field) structPointer {
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return structPointer((*structPointer)(unsafe.Pointer(uintptr(p) + uintptr(f))))
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}
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func structPointer_GetSliceHeader(p structPointer, f field) *reflect.SliceHeader {
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return (*reflect.SliceHeader)(unsafe.Pointer(uintptr(p) + uintptr(f)))
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}
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func structPointer_Add(p structPointer, size field) structPointer {
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return structPointer(unsafe.Pointer(uintptr(p) + uintptr(size)))
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}
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func structPointer_Len(p structPointer, f field) int {
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return len(*(*[]interface{})(unsafe.Pointer(structPointer_GetRefStructPointer(p, f))))
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}
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func structPointer_StructRefSlice(p structPointer, f field, size uintptr) *structRefSlice {
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return &structRefSlice{p: p, f: f, size: size}
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}
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// A structRefSlice represents a slice of structs (themselves submessages or groups).
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type structRefSlice struct {
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p structPointer
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f field
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size uintptr
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}
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func (v *structRefSlice) Len() int {
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return structPointer_Len(v.p, v.f)
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}
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func (v *structRefSlice) Index(i int) structPointer {
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ss := structPointer_GetStructPointer(v.p, v.f)
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ss1 := structPointer_GetRefStructPointer(ss, 0)
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return structPointer_Add(ss1, field(uintptr(i)*v.size))
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}
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