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      1 /* Copyright 2016 The TensorFlow Authors. All Rights Reserved.
      2 
      3 Licensed under the Apache License, Version 2.0 (the "License");
      4 you may not use this file except in compliance with the License.
      5 You may obtain a copy of the License at
      6 
      7     http://www.apache.org/licenses/LICENSE-2.0
      8 
      9 Unless required by applicable law or agreed to in writing, software
     10 distributed under the License is distributed on an "AS IS" BASIS,
     11 WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
     12 See the License for the specific language governing permissions and
     13 limitations under the License.
     14 ==============================================================================*/
     15 
     16 #include "tensorflow/java/src/main/native/graph_jni.h"
     17 
     18 #include <limits>
     19 #include "tensorflow/c/c_api.h"
     20 #include "tensorflow/java/src/main/native/exception_jni.h"
     21 
     22 namespace {
     23 TF_Graph* requireHandle(JNIEnv* env, jlong handle) {
     24   static_assert(sizeof(jlong) >= sizeof(TF_Graph*),
     25                 "Cannot package C object pointers as a Java long");
     26   if (handle == 0) {
     27     throwException(env, kIllegalStateException,
     28                    "close() has been called on the Graph");
     29     return nullptr;
     30   }
     31   return reinterpret_cast<TF_Graph*>(handle);
     32 }
     33 }  // namespace
     34 
     35 JNIEXPORT jlong JNICALL Java_org_tensorflow_Graph_allocate(JNIEnv*, jclass) {
     36   return reinterpret_cast<jlong>(TF_NewGraph());
     37 }
     38 
     39 JNIEXPORT void JNICALL Java_org_tensorflow_Graph_delete(JNIEnv*, jclass,
     40                                                         jlong handle) {
     41   if (handle == 0) return;
     42   TF_DeleteGraph(reinterpret_cast<TF_Graph*>(handle));
     43 }
     44 
     45 JNIEXPORT jlong JNICALL Java_org_tensorflow_Graph_operation(JNIEnv* env,
     46                                                             jclass clazz,
     47                                                             jlong handle,
     48                                                             jstring name) {
     49   TF_Graph* g = requireHandle(env, handle);
     50   if (g == nullptr) return 0;
     51   const char* cname = env->GetStringUTFChars(name, nullptr);
     52   TF_Operation* op = TF_GraphOperationByName(g, cname);
     53   env->ReleaseStringUTFChars(name, cname);
     54   return reinterpret_cast<jlong>(op);
     55 }
     56 
     57 JNIEXPORT jlongArray JNICALL Java_org_tensorflow_Graph_nextOperation(JNIEnv* env,
     58                                                                      jclass clazz,
     59                                                                      jlong handle,
     60                                                                      jint position) {
     61   TF_Graph* g = requireHandle(env, handle);
     62   if (g == nullptr) return nullptr;
     63 
     64   size_t pos = static_cast<size_t>(position);
     65   TF_Operation* operation = TF_GraphNextOperation(g, &pos);
     66   if (operation == nullptr) return nullptr;
     67 
     68   jlong handle_and_position[2];
     69   handle_and_position[0] = reinterpret_cast<jlong>(operation);
     70   handle_and_position[1] = static_cast<jlong>(pos);
     71 
     72   jlongArray rhett = env->NewLongArray(2);
     73   env->SetLongArrayRegion(rhett, 0, 2, handle_and_position);
     74   return rhett;
     75 }
     76 
     77 JNIEXPORT void JNICALL Java_org_tensorflow_Graph_importGraphDef(
     78     JNIEnv* env, jclass clazz, jlong handle, jbyteArray graph_def,
     79     jstring prefix) {
     80   TF_Graph* g = requireHandle(env, handle);
     81   if (g == nullptr) return;
     82 
     83   TF_ImportGraphDefOptions* opts = TF_NewImportGraphDefOptions();
     84 
     85   jboolean is_copy;
     86   const char* cprefix = env->GetStringUTFChars(prefix, &is_copy);
     87   TF_ImportGraphDefOptionsSetPrefix(opts, cprefix);
     88   env->ReleaseStringUTFChars(prefix, cprefix);
     89 
     90   static_assert(sizeof(jbyte) == 1, "unexpected size of the jbyte type");
     91   jbyte* bytes = env->GetByteArrayElements(graph_def, &is_copy);
     92   TF_Buffer* buf =
     93       TF_NewBufferFromString(bytes, env->GetArrayLength(graph_def));
     94   TF_Status* status = TF_NewStatus();
     95 
     96   TF_GraphImportGraphDef(g, buf, opts, status);
     97   throwExceptionIfNotOK(env, status);
     98   // Continue cleaning up resources even if an exception was thrown.
     99 
    100   TF_DeleteStatus(status);
    101   TF_DeleteBuffer(buf);
    102   env->ReleaseByteArrayElements(graph_def, bytes, JNI_ABORT);
    103 
    104   TF_DeleteImportGraphDefOptions(opts);
    105 }
    106 
    107 JNIEXPORT jbyteArray JNICALL
    108 Java_org_tensorflow_Graph_toGraphDef(JNIEnv* env, jclass clazz, jlong handle) {
    109   jbyteArray ret = nullptr;
    110   TF_Graph* g = requireHandle(env, handle);
    111   if (g == nullptr) return ret;
    112 
    113   TF_Buffer* buf = TF_NewBuffer();
    114   TF_Status* status = TF_NewStatus();
    115   TF_GraphToGraphDef(g, buf, status);
    116   if (throwExceptionIfNotOK(env, status)) {
    117     // sizeof(jsize) is less than sizeof(size_t) on some platforms.
    118     if (buf->length > std::numeric_limits<jint>::max()) {
    119       throwException(env, kIndexOutOfBoundsException,
    120                      "GraphDef is too large to serialize into a byte[] array");
    121     } else {
    122       static_assert(sizeof(jbyte) == 1, "unexpected size of the jbyte type");
    123       jint ret_len = static_cast<jint>(buf->length);
    124       ret = env->NewByteArray(ret_len);
    125       env->SetByteArrayRegion(ret, 0, ret_len,
    126                               static_cast<const jbyte*>(buf->data));
    127     }
    128   }
    129   TF_DeleteStatus(status);
    130   TF_DeleteBuffer(buf);
    131   return ret;
    132 }
    133