extras/japi/java/jvpp/gen/jvppgen/jni_common_gen.py

   1 #!/usr/bin/env python2
   2 #
   3 # Copyright (c) 2018 Cisco and/or its affiliates.
   4 # Licensed under the Apache License, Version 2.0 (the "License");
   5 # you may not use this file except in compliance with the License.
   6 # You may obtain a copy of the License at:
   7 #
   8 #     http://www.apache.org/licenses/LICENSE-2.0
   9 #
  10 # Unless required by applicable law or agreed to in writing, software
  11 # distributed under the License is distributed on an "AS IS" BASIS,
  12 # WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  13 # See the License for the specific language governing permissions and
  14 # limitations under the License.
  15 #
  16 from string import Template
  17
  18 from jvpp_model import is_array, is_retval, Class, Enum, Union
  19
  20
  21 def generate_j2c_identifiers(element, class_ref_name, object_ref_name):
  22     identifiers = []
  23     for field in element.fields:
  24         field_type = field.type
  25         identifiers.append(_REQUEST_FIELD_IDENTIFIER_TEMPLATE.substitute(
  26             java_name=field.java_name,
  27             class_ref_name=class_ref_name,
  28             jni_signature=field_type.jni_signature,
  29             jni_type=field_type.jni_type,
  30             jni_accessor=field_type.jni_accessor,
  31             object_ref_name=object_ref_name
  32         ))
  33     return "".join(identifiers)
  34
  35 _REQUEST_FIELD_IDENTIFIER_TEMPLATE = Template("""
  36     jfieldID ${java_name}FieldId = (*env)->GetFieldID(env, ${class_ref_name}, "${java_name}", "${jni_signature}");
  37     ${jni_type} ${java_name} = (*env)->Get${jni_accessor}Field(env, ${object_ref_name}, ${java_name}FieldId);
  38 """)
  39
  40
  41 # TODO(VPP-1187): do not inline JNI object creation inside message handlers to reduce number of special cases
  42 def generate_j2c_swap(element, struct_ref_name, is_alias):
  43     initialization = []
  44     for field in element.fields:
  45         initialization.append(generate_j2c_field_swap(field, struct_ref_name, is_alias))
  46     return "\n".join(initialization)
  47
  48
  49 def generate_j2c_field_swap(field, struct_ref_name, is_alias):
  50     if is_array(field):
  51         return _generate_j2c_array_swap(field, struct_ref_name, is_alias)
  52     else:
  53         return _generate_j2c_scalar_swap(field, struct_ref_name, is_alias)
  54
  55
  56 def _generate_j2c_array_swap(field, struct_ref_name, is_alias):
  57     # TODO(VPP-1186): move the logic to JNI generators
  58     base_type = field.type.base_type
  59     if isinstance(base_type, (Class, Enum, Union)):
  60         return _generate_j2c_object_array_swap(field, struct_ref_name)
  61     elif base_type.is_swap_needed:
  62         return _generate_j2c_primitive_type_array_swap(field, struct_ref_name)
  63     else:
  64         return _generate_j2c_primitive_type_array_no_swap(field, struct_ref_name, is_alias)
  65
  66
  67 def _generate_j2c_object_array_swap(field, struct_ref_name):
  68     field_type = field.type
  69     field_reference_name = field.java_name
  70     c_name = field.name
  71     host = "%sArrayElement" % field_reference_name
  72     net = "%s->%s[_i]" % (struct_ref_name, c_name)
  73     swap_elements = field_type.get_host_to_net_function(host, net)
  74     return _J2C_OBJECT_ARRAY_SWAP_TEMPLATE.substitute(
  75         field_reference_name=field_reference_name,
  76         field_length_check=_generate_field_length_check(field),
  77         swap_elements=swap_elements)
  78
  79 _J2C_OBJECT_ARRAY_SWAP_TEMPLATE = Template("""
  80     {
  81         if (${field_reference_name}) {
  82             size_t _i;
  83             jsize cnt = (*env)->GetArrayLength (env, ${field_reference_name});
  84             ${field_length_check}
  85             for (_i = 0; _i < cnt; _i++) {
  86                 jobject ${field_reference_name}ArrayElement = (*env)->GetObjectArrayElement(env, ${field_reference_name}, _i);
  87                 ${swap_elements};
  88             }
  89         }
  90     }
  91 """)
  92
  93
  94 def _generate_j2c_primitive_type_array_swap(field, struct_ref_name):
  95     field_reference_name = field.java_name
  96     field_type = field.type
  97     host = "%sArrayElements[_i]" % field_reference_name
  98     net = "%s->%s[_i]" % (struct_ref_name,  field.name)
  99     swap_elements = field_type.get_host_to_net_function(host, net)
 100     return _J2C_PRIMITIVE_TYPE_ARRAY_SWAP_TEMPLATE.substitute(
 101         field_reference_name=field_reference_name,
 102         field_length_check=_generate_field_length_check(field),
 103         base_type=field_type.base_type.jni_accessor,
 104         jni_base_type=field_type.base_type.jni_type,
 105         swap_elements=swap_elements
 106     )
 107
 108 _J2C_PRIMITIVE_TYPE_ARRAY_SWAP_TEMPLATE = Template("""
 109     if (${field_reference_name}) {
 110         ${jni_base_type} * ${field_reference_name}ArrayElements = (*env)->Get${base_type}ArrayElements(env, ${field_reference_name}, NULL);
 111         size_t _i;
 112         jsize cnt = (*env)->GetArrayLength(env, ${field_reference_name});
 113         ${field_length_check}
 114         for (_i = 0; _i < cnt; _i++) {
 115             ${swap_elements};
 116         }
 117         (*env)->Release${base_type}ArrayElements (env, ${field_reference_name}, ${field_reference_name}ArrayElements, 0);
 118     }
 119     """)
 120
 121
 122 def _generate_j2c_primitive_type_array_no_swap(field, struct_ref_name, is_alias):
 123     field_type = field.type
 124     if not is_alias:
 125         template = _J2C_PRIMITIVE_TYPE_ARRAY_NO_SWAP_TEMPLATE
 126     else:
 127         template = _J2C_ALIAS_PRIMITIVE_TYPE_ARRAY_NO_SWAP_TEMPLATE
 128
 129     return template.substitute(
 130         field_reference_name=field.java_name,
 131         field_length_check=_generate_field_length_check(field),
 132         base_type=field_type.base_type.jni_accessor,
 133         jni_base_type=field_type.base_type.jni_type,
 134         struct_reference_name=struct_ref_name,
 135         c_name=field.name
 136     )
 137
 138 _J2C_PRIMITIVE_TYPE_ARRAY_NO_SWAP_TEMPLATE = Template("""
 139     if (${field_reference_name}) {
 140         jsize cnt = (*env)->GetArrayLength (env, ${field_reference_name});
 141         ${field_length_check}
 142         (*env)->Get${base_type}ArrayRegion(env, ${field_reference_name}, 0, cnt, (${jni_base_type} *)${struct_reference_name}->${c_name});
 143     }
 144 """)
 145
 146
 147 _J2C_ALIAS_PRIMITIVE_TYPE_ARRAY_NO_SWAP_TEMPLATE = Template("""
 148     if (${field_reference_name}) {
 149         jsize cnt = (*env)->GetArrayLength (env, ${field_reference_name});
 150         ${field_length_check}
 151         (*env)->Get${base_type}ArrayRegion(env, ${field_reference_name}, 0, cnt, (${jni_base_type} *)${struct_reference_name});
 152     }
 153 """)
 154
 155
 156 def _generate_field_length_check(field):
 157     # Enforce max length if array has fixed length or uses variable length syntax
 158     field_length = str(field.array_len)
 159     if field.array_len_field:
 160         field_length = field.array_len_field.java_name
 161
 162     # TODO: remove when ZLAs without length field are disabled
 163     if field_length != "0":
 164         return _FIELD_LENGTH_CHECK.substitute(field_length=field_length)
 165     else:
 166         return ""
 167
 168 # Make sure we do not write more elements that are expected
 169 _FIELD_LENGTH_CHECK = Template("""
 170         size_t max_size = ${field_length};
 171         if (cnt > max_size) cnt = max_size;""")
 172
 173
 174 def _generate_j2c_scalar_swap(field, struct_ref_name, is_alias):
 175     field_type = field.type
 176     if field_type.is_swap_needed:
 177         host = field.java_name
 178         if not is_alias:
 179             net = "%s->%s" % (struct_ref_name, field.name)
 180             return "    %s;" % field_type.get_host_to_net_function(host, net)
 181         else:
 182             net = "%s" % (struct_ref_name)
 183             return "    *%s;" % field_type.get_host_to_net_function(host, net)
 184     else:
 185         return "    %s->%s = %s;" % (struct_ref_name, field.name, field.java_name)
 186
 187
 188 def generate_c2j_swap(element, object_ref_name, struct_ref_name, is_alias):
 189     msg_java_name = element.java_name_lower
 190     initialization = []
 191     for field in element.fields:
 192         if is_retval(field):
 193             # For retval don't generate setters and generate retval check
 194             continue
 195         elif is_array(field):
 196             initialization.append(_generate_c2j_array_swap(msg_java_name, field, object_ref_name, struct_ref_name, is_alias))
 197         else:
 198             initialization.append(_generate_c2j_scalar_swap(msg_java_name, field, object_ref_name, struct_ref_name, is_alias))
 199     return "".join(initialization)
 200
 201
 202 def _generate_c2j_array_swap(msg_java_name, field, object_ref_name, struct_ref_name, is_alias):
 203     # TODO(VPP-1186): move the logic to JNI generators
 204     base_type = field.type.base_type
 205     if isinstance(base_type, (Class, Union)):
 206         return _generate_c2j_object_array_swap(msg_java_name, field, object_ref_name, struct_ref_name)
 207     elif isinstance(base_type, Enum):
 208         return _generate_c2j_enum_array_swap(msg_java_name, field, object_ref_name, struct_ref_name)
 209     elif base_type.is_swap_needed:
 210         return _generate_c2j_primitive_type_array_swap(msg_java_name, field, object_ref_name, struct_ref_name)
 211     else:
 212         return _generate_c2j_primitive_type_array_no_swap(msg_java_name, field, object_ref_name, struct_ref_name, is_alias)
 213
 214
 215 def _generate_c2j_object_array_swap(msg_java_name, field, object_ref_name, struct_ref_name):
 216     field_type = field.type
 217     return _C2J_OBJECT_ARRAY_SWAP_TEMPLATE.substitute(
 218         field_reference_name=field.java_name,
 219         class_ref_name=msg_java_name,
 220         jni_signature=field_type.jni_signature,
 221         jni_name=field_type.base_type.jni_name,
 222         field_length=_generate_array_length(field, struct_ref_name),
 223         net_to_host_function=field_type.net_to_host_function,
 224         struct_ref_name=struct_ref_name,
 225         object_ref_name=object_ref_name,
 226         c_name=field.name
 227     )
 228
 229 _C2J_OBJECT_ARRAY_SWAP_TEMPLATE = Template("""
 230     jfieldID ${field_reference_name}FieldId = (*env)->GetFieldID(env, ${class_ref_name}Class, "${field_reference_name}", "${jni_signature}");
 231     {
 232         jclass ${field_reference_name}Class = (*env)->FindClass(env, "${jni_name}");
 233         jobjectArray ${field_reference_name} = (*env)->NewObjectArray(env, ${field_length}, ${field_reference_name}Class, 0);
 234         jmethodID ${field_reference_name}Constructor = (*env)->GetMethodID(env, ${field_reference_name}Class, "<init>", "()V");
 235         unsigned int _i;
 236         for (_i = 0; _i < ${field_length}; _i++) {
 237             jobject ${field_reference_name}ArrayElement = (*env)->NewObject(env, ${field_reference_name}Class,  ${field_reference_name}Constructor);
 238             ${net_to_host_function}(env, &(${struct_ref_name}->${c_name}[_i]), ${field_reference_name}ArrayElement);
 239             (*env)->SetObjectArrayElement(env, ${field_reference_name}, _i, ${field_reference_name}ArrayElement);
 240             (*env)->DeleteLocalRef(env, ${field_reference_name}ArrayElement);
 241         }
 242         (*env)->SetObjectField(env, ${object_ref_name}, ${field_reference_name}FieldId, ${field_reference_name});
 243         (*env)->DeleteLocalRef(env, ${field_reference_name});
 244     }
 245 """)
 246
 247
 248 def _generate_c2j_enum_array_swap(msg_java_name, field, object_ref_name, struct_ref_name):
 249     field_type = field.type
 250     base_type = field_type.base_type
 251     return _C2J_ENUM_ARRAY_SWAP_TEMPLATE.substitute(
 252         field_reference_name=field.java_name,
 253         class_ref_name=msg_java_name,
 254         jni_signature=field_type.jni_signature,
 255         jni_name=base_type.jni_name,
 256         field_length=_generate_array_length(field, struct_ref_name),
 257         net_to_host_function=field_type.net_to_host_function,
 258         jni_signature_enum_value=base_type.value.type.jni_signature,
 259         struct_ref_name=struct_ref_name,
 260         object_ref_name=object_ref_name,
 261         c_name=field.name
 262     )
 263
 264 _C2J_ENUM_ARRAY_SWAP_TEMPLATE = Template("""
 265     jfieldID ${field_reference_name}FieldId = (*env)->GetFieldID(env, ${class_ref_name}Class, "${field_reference_name}", "${jni_signature}");
 266     {
 267         jclass ${field_reference_name}Class = (*env)->FindClass(env, "${jni_name}");
 268         jobjectArray ${field_reference_name} = (*env)->NewObjectArray(env, ${field_length}, ${field_reference_name}Class, 0);
 269         jmethodID ${field_reference_name}Constructor = (*env)->GetStaticMethodID(env, ${field_reference_name}Class, "forValue", "(${jni_signature_enum_value})${jni_signature}");
 270         unsigned int _i;
 271         for (_i = 0; _i < ${field_length}; _i++) {
 272             jobject ${field_reference_name}ArrayElement = (*env)->CallStaticObjectMethod(env, ${field_reference_name}Class, ${field_reference_name}Constructor, ${net_to_host_function}(${struct_ref_name}->${c_name}[_i]));
 273             (*env)->SetObjectArrayElement(env, ${field_reference_name}, _i, ${field_reference_name}ArrayElement);
 274             (*env)->DeleteLocalRef(env, ${field_reference_name}ArrayElement);
 275         }
 276         (*env)->SetObjectField(env, ${object_ref_name}, ${field_reference_name}FieldId, ${field_reference_name});
 277         (*env)->DeleteLocalRef(env, ${field_reference_name});
 278     }
 279 """)
 280
 281
 282 def _generate_c2j_primitive_type_array_swap(msg_java_name, field, object_ref_name, struct_ref_name):
 283     field_type = field.type
 284     return _C2J_PRIMITIVE_TYPE_ARRAY_SWAP_TEMPLATE.substitute(
 285         field_reference_name=field.java_name,
 286         class_ref_name=msg_java_name,
 287         jni_signature=field_type.jni_signature,
 288         jni_type=field_type.jni_type,
 289         base_type=field_type.base_type.jni_accessor,
 290         field_length=_generate_array_length(field, struct_ref_name),
 291         jni_base_type=field_type.base_type.jni_type,
 292         object_ref_name=object_ref_name,
 293         struct_ref_name=struct_ref_name,
 294         net_to_host_function=field_type.net_to_host_function,
 295         c_name=field.name
 296     )
 297
 298 _C2J_PRIMITIVE_TYPE_ARRAY_SWAP_TEMPLATE = Template("""
 299     jfieldID ${field_reference_name}FieldId = (*env)->GetFieldID(env, ${class_ref_name}Class, "${field_reference_name}", "${jni_signature}");
 300     {
 301         ${jni_type} ${field_reference_name} = (*env)->New${base_type}Array(env, ${field_length});
 302         ${jni_base_type} * ${field_reference_name}ArrayElements = (*env)->Get${base_type}ArrayElements(env, ${field_reference_name}, NULL);
 303         unsigned int _i;
 304         for (_i = 0; _i < ${field_length}; _i++) {
 305             ${field_reference_name}ArrayElements[_i] = ${net_to_host_function}(${struct_ref_name}->${c_name}[_i]);
 306         }
 307
 308         (*env)->Release${base_type}ArrayElements(env,  ${field_reference_name}, ${field_reference_name}ArrayElements, 0);
 309         (*env)->SetObjectField(env, ${object_ref_name}, ${field_reference_name}FieldId, ${field_reference_name});
 310         (*env)->DeleteLocalRef(env, ${field_reference_name});
 311     }
 312 """)
 313
 314
 315 def _generate_c2j_primitive_type_array_no_swap(msg_java_name, field, object_ref_name, struct_ref_name, is_alias):
 316     field_type = field.type
 317     if not is_alias:
 318         template = _C2J_PRIMITIVE_TYPE_ARRAY_NO_SWAP_TEMPLATE
 319     else:
 320         template = _C2J_ALIAS_PRIMITIVE_TYPE_ARRAY_NO_SWAP_TEMPLATE
 321     return template.substitute(
 322         field_reference_name=field.java_name,
 323         class_ref_name=msg_java_name,
 324         jni_signature=field_type.jni_signature,
 325         jni_type=field_type.jni_type,
 326         base_type=field_type.base_type.jni_accessor,
 327         field_length=_generate_array_length(field, struct_ref_name),
 328         jni_base_type=field_type.base_type.jni_type,
 329         object_ref_name=object_ref_name,
 330         struct_ref_name=struct_ref_name,
 331         c_name=field.name
 332     )
 333
 334 _C2J_PRIMITIVE_TYPE_ARRAY_NO_SWAP_TEMPLATE = Template("""
 335     jfieldID ${field_reference_name}FieldId = (*env)->GetFieldID(env, ${class_ref_name}Class, "${field_reference_name}", "${jni_signature}");
 336     ${jni_type} ${field_reference_name} = (*env)->New${base_type}Array(env, ${field_length});
 337     (*env)->Set${base_type}ArrayRegion(env, ${field_reference_name}, 0, ${field_length}, (const ${jni_base_type}*)${struct_ref_name}->${c_name});
 338     (*env)->SetObjectField(env, ${object_ref_name}, ${field_reference_name}FieldId, ${field_reference_name});
 339     (*env)->DeleteLocalRef(env, ${field_reference_name});
 340 """)
 341
 342
 343 _C2J_ALIAS_PRIMITIVE_TYPE_ARRAY_NO_SWAP_TEMPLATE = Template("""
 344     jfieldID ${field_reference_name}FieldId = (*env)->GetFieldID(env, ${class_ref_name}Class, "${field_reference_name}", "${jni_signature}");
 345     ${jni_type} ${field_reference_name} = (*env)->New${base_type}Array(env, ${field_length});
 346     (*env)->Set${base_type}ArrayRegion(env, ${field_reference_name}, 0, ${field_length}, (const ${jni_base_type}*)${struct_ref_name});
 347     (*env)->SetObjectField(env, ${object_ref_name}, ${field_reference_name}FieldId, ${field_reference_name});
 348     (*env)->DeleteLocalRef(env, ${field_reference_name});
 349 """)
 350
 351
 352 def _generate_array_length(field, struct_ref_name):
 353     if field.array_len_field:
 354         len_field = field.array_len_field
 355         if len_field.type.is_swap_needed:
 356             return "%s(%s->%s)" % (len_field.type.host_to_net_function, struct_ref_name, len_field.name)
 357         else:
 358             return "%s->%s" % (struct_ref_name, len_field.name)
 359     return field.array_len
 360
 361
 362 def _generate_c2j_scalar_swap(msg_java_name, field, object_ref_name, struct_ref_name, is_alias):
 363     field_type = field.type
 364     if field_type.is_swap_needed:
 365         # TODO(VPP-1186): move the logic to JNI generators
 366         if isinstance(field_type, (Class, Union)):
 367             return _generate_c2j_object_swap(msg_java_name, field, object_ref_name, struct_ref_name)
 368         elif isinstance(field_type, Enum):
 369             return _generate_c2j_enum_swap(msg_java_name, field, object_ref_name, struct_ref_name)
 370         else:
 371             return _generate_c2j_primitive_type_swap(msg_java_name, field, object_ref_name, struct_ref_name, is_alias)
 372     else:
 373         return _generate_c2j_primitive_type_no_swap(msg_java_name, field, object_ref_name, struct_ref_name)
 374
 375
 376 def _generate_c2j_object_swap(msg_java_name, field, object_ref_name, struct_ref_name):
 377     field_type = field.type
 378     return _C2J_OBJECT_SWAP_TEMPLATE.substitute(
 379         java_name=field.java_name,
 380         class_ref_name=msg_java_name,
 381         jni_signature=field_type.jni_signature,
 382         jni_name=field_type.jni_name,
 383         jni_accessor=field_type.jni_accessor,
 384         object_ref_name=object_ref_name,
 385         struct_ref_name=struct_ref_name,
 386         net_to_host_function=field_type.net_to_host_function,
 387         c_name=field.name)
 388
 389 _C2J_OBJECT_SWAP_TEMPLATE = Template("""
 390     jfieldID ${java_name}FieldId = (*env)->GetFieldID(env, ${class_ref_name}Class, "${java_name}", "${jni_signature}");
 391     jclass ${java_name}Class = (*env)->FindClass(env, "${jni_name}");
 392     jmethodID ${java_name}Constructor = (*env)->GetMethodID(env, ${java_name}Class, "<init>", "()V");
 393     jobject ${java_name} = (*env)->NewObject(env, ${java_name}Class,  ${java_name}Constructor);
 394     ${net_to_host_function}(env, &(${struct_ref_name}->${c_name}), ${java_name});
 395     (*env)->Set${jni_accessor}Field(env, ${object_ref_name}, ${java_name}FieldId, ${java_name});
 396     (*env)->DeleteLocalRef(env, ${java_name});
 397 """)
 398
 399
 400 def _generate_c2j_enum_swap(msg_java_name, field, object_ref_name, struct_ref_name):
 401     field_type = field.type
 402     return _C2J_ENUM_SWAP_TEMPLATE.substitute(
 403         java_name=field.java_name,
 404         class_ref_name=msg_java_name,
 405         jni_signature=field_type.jni_signature,
 406         jni_signature_enum_value=field_type.value.type.jni_signature,
 407         jni_name=field_type.jni_name,
 408         jni_accessor=field_type.jni_accessor,
 409         object_ref_name=object_ref_name,
 410         struct_ref_name=struct_ref_name,
 411         net_to_host_function=field_type.net_to_host_function,
 412         c_name=field.name)
 413
 414 _C2J_ENUM_SWAP_TEMPLATE = Template("""
 415     jfieldID ${java_name}FieldId = (*env)->GetFieldID(env, ${class_ref_name}Class, "${java_name}", "${jni_signature}");
 416     jclass ${java_name}Class = (*env)->FindClass(env, "${jni_name}");
 417     jmethodID ${java_name}Constructor = (*env)->GetStaticMethodID(env, ${java_name}Class, "forValue", "(${jni_signature_enum_value})${jni_signature}");
 418     jobject ${java_name} = (*env)->CallStaticObjectMethod(env, ${java_name}Class, ${java_name}Constructor, ${net_to_host_function}(${struct_ref_name}->${c_name}));
 419     (*env)->SetObjectField(env, ${object_ref_name}, ${java_name}FieldId, ${java_name});
 420     (*env)->DeleteLocalRef(env, ${java_name});
 421 """)
 422
 423
 424 def _generate_c2j_primitive_type_swap(msg_java_name, field, object_ref_name, struct_ref_name, is_alias):
 425     field_type = field.type
 426     if not is_alias:
 427         template = _C2J_PRIMITIVE_TYPE_SWAP_TEMPLATE
 428     else:
 429         template = _C2J_ALIAS_PRIMITIVE_TYPE_SWAP_TEMPLATE
 430     return template.substitute(
 431         java_name=field.java_name,
 432         class_ref_name=msg_java_name,
 433         jni_signature=field_type.jni_signature,
 434         jni_accessor=field_type.jni_accessor,
 435         object_ref_name=object_ref_name,
 436         net_to_host_function=field_type.net_to_host_function,
 437         struct_ref_name=struct_ref_name,
 438         c_name=field.name
 439     )
 440
 441 _C2J_PRIMITIVE_TYPE_SWAP_TEMPLATE = Template("""
 442     jfieldID ${java_name}FieldId = (*env)->GetFieldID(env, ${class_ref_name}Class, "${java_name}", "${jni_signature}");
 443     (*env)->Set${jni_accessor}Field(env, ${object_ref_name}, ${java_name}FieldId, ${net_to_host_function}(${struct_ref_name}->${c_name}));
 444 """)
 445
 446
 447 _C2J_ALIAS_PRIMITIVE_TYPE_SWAP_TEMPLATE = Template("""
 448     jfieldID ${java_name}FieldId = (*env)->GetFieldID(env, ${class_ref_name}Class, "${java_name}", "${jni_signature}");
 449     (*env)->Set${jni_accessor}Field(env, ${object_ref_name}, ${java_name}FieldId, ${net_to_host_function}(*${struct_ref_name}));
 450 """)
 451
 452
 453 def _generate_c2j_primitive_type_no_swap(msg_java_name, field, object_ref_name, struct_ref_name):
 454     field_type = field.type
 455     return _C2J_PRIMITIVE_TYPE_NO_SWAP_TEMPLATE.substitute(
 456         java_name=field.java_name,
 457         class_ref_name=msg_java_name,
 458         jni_signature=field_type.jni_signature,
 459         jni_accessor=field_type.jni_accessor,
 460         object_ref_name=object_ref_name,
 461         struct_ref_name=struct_ref_name,
 462         c_name=field.name
 463     )
 464
 465 _C2J_PRIMITIVE_TYPE_NO_SWAP_TEMPLATE = Template("""
 466     jfieldID ${java_name}FieldId = (*env)->GetFieldID(env, ${class_ref_name}Class, "${java_name}", "${jni_signature}");
 467     (*env)->Set${jni_accessor}Field(env, ${object_ref_name}, ${java_name}FieldId, ${struct_ref_name}->${c_name});
 468 """)