129 lines
3.5 KiB
Go
129 lines
3.5 KiB
Go
/*
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Copyright 2017 The TensorFlow Authors. All Rights Reserved.
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Licensed under the Apache License, Version 2.0 (the "License");
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you may not use this file except in compliance with the License.
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You may obtain a copy of the License at
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http://www.apache.org/licenses/LICENSE-2.0
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Unless required by applicable law or agreed to in writing, software
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distributed under the License is distributed on an "AS IS" BASIS,
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WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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See the License for the specific language governing permissions and
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limitations under the License.
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*/
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package internal
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/*
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#include <stdlib.h>
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#include <string.h>
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#include "tensorflow/c/c_api.h"
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*/
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import "C"
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import (
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"errors"
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"fmt"
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"runtime"
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"unsafe"
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"github.com/golang/protobuf/proto"
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adpb "github.com/tensorflow/tensorflow/tensorflow/go/core/framework/api_def_go_proto"
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odpb "github.com/tensorflow/tensorflow/tensorflow/go/core/framework/op_def_go_proto"
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)
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// Encapsulates a collection of API definitions.
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//
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// apiDefMap represents a map from operation name to corresponding
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// ApiDef proto (see
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// https://www.tensorflow.org/code/tensorflow/core/framework/api_def.proto
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// for ApiDef proto definition).
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type apiDefMap struct {
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c *C.TF_ApiDefMap
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}
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// Creates and returns a new apiDefMap instance.
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//
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// oplist is and OpList proto instance (see
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// https://www.tensorflow.org/code/tensorflow/core/framework/op_def.proto
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// for OpList proto definition).
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func newAPIDefMap(oplist *odpb.OpList) (*apiDefMap, error) {
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// Create a buffer containing the serialized OpList.
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opdefSerialized, err := proto.Marshal(oplist)
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if err != nil {
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return nil, fmt.Errorf("could not serialize OpDef for %s", oplist.String())
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}
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data := C.CBytes(opdefSerialized)
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defer C.free(data)
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opbuf := C.TF_NewBuffer()
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defer C.TF_DeleteBuffer(opbuf)
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opbuf.data = data
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opbuf.length = C.size_t(len(opdefSerialized))
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// Create ApiDefMap.
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status := C.TF_NewStatus()
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defer C.TF_DeleteStatus(status)
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capimap := C.TF_NewApiDefMap(opbuf, status)
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if C.TF_GetCode(status) != C.TF_OK {
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return nil, errors.New(C.GoString(C.TF_Message(status)))
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}
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apimap := &apiDefMap{capimap}
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runtime.SetFinalizer(
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apimap,
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func(a *apiDefMap) {
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C.TF_DeleteApiDefMap(a.c)
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})
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return apimap, nil
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}
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// Updates apiDefMap with the overrides specified in `data`.
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//
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// data - ApiDef text proto.
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func (m *apiDefMap) Put(data string) error {
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cdata := C.CString(data)
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defer C.free(unsafe.Pointer(cdata))
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status := C.TF_NewStatus()
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defer C.TF_DeleteStatus(status)
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C.TF_ApiDefMapPut(m.c, cdata, C.size_t(len(data)), status)
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if C.TF_GetCode(status) != C.TF_OK {
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return errors.New(C.GoString(C.TF_Message(status)))
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}
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return nil
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}
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// Returns ApiDef proto instance for the TensorFlow operation
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// named `opname`.
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func (m *apiDefMap) Get(opname string) (*adpb.ApiDef, error) {
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cname := C.CString(opname)
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defer C.free(unsafe.Pointer(cname))
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status := C.TF_NewStatus()
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defer C.TF_DeleteStatus(status)
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apidefBuf := C.TF_ApiDefMapGet(
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m.c, cname, C.size_t(len(opname)), status)
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defer C.TF_DeleteBuffer(apidefBuf)
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if C.TF_GetCode(status) != C.TF_OK {
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return nil, errors.New(C.GoString(C.TF_Message(status)))
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}
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if apidefBuf == nil {
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return nil, fmt.Errorf("could not find ApiDef for %s", opname)
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}
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var (
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apidef = new(adpb.ApiDef)
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size = int(apidefBuf.length)
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// A []byte backed by C memory.
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// See: https://github.com/golang/go/wiki/cgo#turning-c-arrays-into-go-slices
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data = (*[1 << 30]byte)(unsafe.Pointer(apidefBuf.data))[:size:size]
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err = proto.Unmarshal(data, apidef)
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)
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if err != nil {
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return nil, err
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}
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return apidef, nil
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}
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