1 files changed, 482 insertions, 0 deletions
diff --git a/java/jvpp/gen/jvppgen/jni_common_gen.py b/java/jvpp/gen/jvppgen/jni_common_gen.py
new file mode 100755
index 0000000..b52e5ff
--- /dev/null
+++ b/java/jvpp/gen/jvppgen/jni_common_gen.py
@@ -0,0 +1,482 @@
+#!/usr/bin/env python2
+#
+# Copyright (c) 2018 Cisco and/or its affiliates.
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at:
+#
+#     http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+#
+from string import Template
+
+from jvpp_model import is_array, is_retval, Class, Enum, Union
+
+
+def generate_j2c_identifiers(element, class_ref_name, object_ref_name):
+    identifiers = []
+    for field in element.fields:
+        field_type = field.type
+        identifiers.append(_REQUEST_FIELD_IDENTIFIER_TEMPLATE.substitute(
+            java_name=field.java_name,
+            class_ref_name=class_ref_name,
+            jni_signature=field_type.jni_signature,
+            jni_type=field_type.jni_type,
+            jni_accessor=field_type.jni_accessor,
+            object_ref_name=object_ref_name
+        ))
+    return "".join(identifiers)
+
+_REQUEST_FIELD_IDENTIFIER_TEMPLATE = Template("""
+    jfieldID ${java_name}FieldId = (*env)->GetFieldID(env, ${class_ref_name}, "${java_name}", "${jni_signature}");
+    ${jni_type} ${java_name} = (*env)->Get${jni_accessor}Field(env, ${object_ref_name}, ${java_name}FieldId);
+""")
+
+
+# TODO(VPP-1187): do not inline JNI object creation inside message handlers to reduce number of special cases
+def generate_j2c_swap(element, struct_ref_name, is_alias):
+    initialization = []
+    for field in element.fields:
+        initialization.append(generate_j2c_field_swap(field, struct_ref_name, is_alias))
+    return "\n".join(initialization)
+
+
+def generate_j2c_field_swap(field, struct_ref_name, is_alias):
+    if is_array(field):
+        return _generate_j2c_array_swap(field, struct_ref_name, is_alias)
+    else:
+        return _generate_j2c_scalar_swap(field, struct_ref_name, is_alias)
+
+
+def _generate_j2c_array_swap(field, struct_ref_name, is_alias):
+    # TODO(VPP-1186): move the logic to JNI generators
+    base_type = field.type.base_type
+    if isinstance(base_type, (Class, Enum, Union)):
+        return _generate_j2c_object_array_swap(field, struct_ref_name)
+    elif base_type.is_swap_needed:
+        return _generate_j2c_primitive_type_array_swap(field, struct_ref_name)
+    else:
+        return _generate_j2c_primitive_type_array_no_swap(field, struct_ref_name, is_alias)
+
+
+def _generate_j2c_object_array_swap(field, struct_ref_name):
+    field_type = field.type
+    field_reference_name = field.java_name
+    c_name = field.name
+    host = "%sArrayElement" % field_reference_name
+    net = "%s->%s[_i]" % (struct_ref_name, c_name)
+    swap_elements = field_type.get_host_to_net_function(host, net)
+    return _J2C_OBJECT_ARRAY_SWAP_TEMPLATE.substitute(
+        field_reference_name=field_reference_name,
+        field_length_check=_generate_field_length_check(field),
+        swap_elements=swap_elements)
+
+_J2C_OBJECT_ARRAY_SWAP_TEMPLATE = Template("""
+    {
+        if (${field_reference_name}) {
+            size_t _i;
+            jsize cnt = (*env)->GetArrayLength (env, ${field_reference_name});
+            ${field_length_check}
+            for (_i = 0; _i < cnt; _i++) {
+                jobject ${field_reference_name}ArrayElement = (*env)->GetObjectArrayElement(env, ${field_reference_name}, _i);
+                ${swap_elements};
+            }
+        }
+    }
+""")
+
+
+def _generate_j2c_primitive_type_array_swap(field, struct_ref_name):
+    field_reference_name = field.java_name
+    field_type = field.type
+    host = "%sArrayElements[_i]" % field_reference_name
+    net = "%s->%s[_i]" % (struct_ref_name,  field.name)
+    swap_elements = field_type.get_host_to_net_function(host, net)
+    return _J2C_PRIMITIVE_TYPE_ARRAY_SWAP_TEMPLATE.substitute(
+        field_reference_name=field_reference_name,
+        field_length_check=_generate_field_length_check(field),
+        base_type=field_type.base_type.jni_accessor,
+        jni_base_type=field_type.base_type.jni_type,
+        swap_elements=swap_elements
+    )
+
+_J2C_PRIMITIVE_TYPE_ARRAY_SWAP_TEMPLATE = Template("""
+    if (${field_reference_name}) {
+        ${jni_base_type} * ${field_reference_name}ArrayElements = (*env)->Get${base_type}ArrayElements(env, ${field_reference_name}, NULL);
+        size_t _i;
+        jsize cnt = (*env)->GetArrayLength(env, ${field_reference_name});
+        ${field_length_check}
+        for (_i = 0; _i < cnt; _i++) {
+            ${swap_elements};
+        }
+        (*env)->Release${base_type}ArrayElements (env, ${field_reference_name}, ${field_reference_name}ArrayElements, 0);
+    }
+    """)
+
+
+def _generate_j2c_primitive_type_array_no_swap(field, struct_ref_name, is_alias):
+    field_type = field.type
+    if not is_alias:
+        template = _J2C_PRIMITIVE_TYPE_ARRAY_NO_SWAP_TEMPLATE
+    else:
+        template = _J2C_ALIAS_PRIMITIVE_TYPE_ARRAY_NO_SWAP_TEMPLATE
+
+    return template.substitute(
+        field_reference_name=field.java_name,
+        field_length_check=_generate_field_length_check(field),
+        base_type=field_type.base_type.jni_accessor,
+        jni_base_type=field_type.base_type.jni_type,
+        struct_reference_name=struct_ref_name,
+        c_name=field.name
+    )
+
+_J2C_PRIMITIVE_TYPE_ARRAY_NO_SWAP_TEMPLATE = Template("""
+    if (${field_reference_name}) {
+        jsize cnt = (*env)->GetArrayLength (env, ${field_reference_name});
+        ${field_length_check}
+        (*env)->Get${base_type}ArrayRegion(env, ${field_reference_name}, 0, cnt, (${jni_base_type} *)${struct_reference_name}->${c_name});
+    }
+""")
+
+
+_J2C_ALIAS_PRIMITIVE_TYPE_ARRAY_NO_SWAP_TEMPLATE = Template("""
+    if (${field_reference_name}) {
+        jsize cnt = (*env)->GetArrayLength (env, ${field_reference_name});
+        ${field_length_check}
+        (*env)->Get${base_type}ArrayRegion(env, ${field_reference_name}, 0, cnt, (${jni_base_type} *)${struct_reference_name});
+    }
+""")
+
+
+def _generate_field_length_check(field):
+    # Enforce max length if array has fixed length or uses variable length syntax
+    field_length = str(field.array_len)
+    if field.array_len_field:
+        field_length = field.array_len_field.java_name
+
+    # TODO: remove when ZLAs without length field are disabled
+    if field_length != "0":
+        return _FIELD_LENGTH_CHECK.substitute(field_length=field_length)
+    else:
+        return ""
+
+
+# Make sure we do not write more elements that are expected
+_FIELD_LENGTH_CHECK = Template("""
+        size_t max_size = ${field_length};
+        if (cnt > max_size) cnt = max_size;""")
+
+
+def _generate_j2c_scalar_swap(field, struct_ref_name, is_alias):
+    field_type = field.type
+    if field_type.is_swap_needed:
+        host = field.java_name
+        if not is_alias:
+            net = "%s->%s" % (struct_ref_name, field.name)
+            if field_type.name == "string":
+                net = "%s->%s" % (struct_ref_name, field.name)
+                return "    _host_to_net_%s(env, %s, (vl_api_string_t *) &%s);" % (field_type.name, host, net)
+            else:
+                return "    %s;" % field_type.get_host_to_net_function(host, net)
+        else:
+            net = "%s" % struct_ref_name
+            return "    *%s;" % field_type.get_host_to_net_function(host, net)
+    else:
+        return "    %s->%s = %s;" % (struct_ref_name, field.name, field.java_name)
+
+
+def generate_c2j_swap(element, object_ref_name, struct_ref_name, is_alias):
+    msg_java_name = element.java_name_lower
+    initialization = []
+    for field in element.fields:
+        if is_retval(field):
+            # For retval don't generate setters and generate retval check
+            continue
+        elif is_array(field):
+            initialization.append(_generate_c2j_array_swap(msg_java_name, field, object_ref_name, struct_ref_name, is_alias))
+        else:
+            initialization.append(_generate_c2j_scalar_swap(msg_java_name, field, object_ref_name, struct_ref_name, is_alias))
+    return "".join(initialization)
+
+
+def _generate_c2j_array_swap(msg_java_name, field, object_ref_name, struct_ref_name, is_alias):
+    # TODO(VPP-1186): move the logic to JNI generators
+    base_type = field.type.base_type
+    if isinstance(base_type, (Class, Union)):
+        return _generate_c2j_object_array_swap(msg_java_name, field, object_ref_name, struct_ref_name)
+    elif isinstance(base_type, Enum):
+        return _generate_c2j_enum_array_swap(msg_java_name, field, object_ref_name, struct_ref_name)
+    elif base_type.is_swap_needed:
+        return _generate_c2j_primitive_type_array_swap(msg_java_name, field, object_ref_name, struct_ref_name)
+    else:
+        return _generate_c2j_primitive_type_array_no_swap(msg_java_name, field, object_ref_name, struct_ref_name, is_alias)
+
+
+def _generate_c2j_object_array_swap(msg_java_name, field, object_ref_name, struct_ref_name):
+    field_type = field.type
+    return _C2J_OBJECT_ARRAY_SWAP_TEMPLATE.substitute(
+        field_reference_name=field.java_name,
+        class_ref_name=msg_java_name,
+        jni_signature=field_type.jni_signature,
+        jni_name=field_type.base_type.jni_name,
+        field_length=_generate_array_length(field, struct_ref_name),
+        net_to_host_function=field_type.net_to_host_function,
+        struct_ref_name=struct_ref_name,
+        object_ref_name=object_ref_name,
+        c_name=field.name
+    )
+
+_C2J_OBJECT_ARRAY_SWAP_TEMPLATE = Template("""
+    jfieldID ${field_reference_name}FieldId = (*env)->GetFieldID(env, ${class_ref_name}Class, "${field_reference_name}", "${jni_signature}");
+    {
+        jclass ${field_reference_name}Class = (*env)->FindClass(env, "${jni_name}");
+        jobjectArray ${field_reference_name} = (*env)->NewObjectArray(env, ${field_length}, ${field_reference_name}Class, 0);
+        jmethodID ${field_reference_name}Constructor = (*env)->GetMethodID(env, ${field_reference_name}Class, "<init>", "()V");
+        unsigned int _i;
+        for (_i = 0; _i < ${field_length}; _i++) {
+            jobject ${field_reference_name}ArrayElement = (*env)->NewObject(env, ${field_reference_name}Class,  ${field_reference_name}Constructor);
+            ${net_to_host_function}(env, &(${struct_ref_name}->${c_name}[_i]), ${field_reference_name}ArrayElement);
+            (*env)->SetObjectArrayElement(env, ${field_reference_name}, _i, ${field_reference_name}ArrayElement);
+            (*env)->DeleteLocalRef(env, ${field_reference_name}ArrayElement);
+        }
+        (*env)->SetObjectField(env, ${object_ref_name}, ${field_reference_name}FieldId, ${field_reference_name});
+        (*env)->DeleteLocalRef(env, ${field_reference_name});
+    }
+""")
+
+
+def _generate_c2j_enum_array_swap(msg_java_name, field, object_ref_name, struct_ref_name):
+    field_type = field.type
+    base_type = field_type.base_type
+    return _C2J_ENUM_ARRAY_SWAP_TEMPLATE.substitute(
+        field_reference_name=field.java_name,
+        class_ref_name=msg_java_name,
+        jni_signature=field_type.jni_signature,
+        jni_name=base_type.jni_name,
+        field_length=_generate_array_length(field, struct_ref_name),
+        net_to_host_function=field_type.net_to_host_function,
+        jni_signature_enum_value=base_type.value.type.jni_signature,
+        struct_ref_name=struct_ref_name,
+        object_ref_name=object_ref_name,
+        c_name=field.name
+    )
+
+_C2J_ENUM_ARRAY_SWAP_TEMPLATE = Template("""
+    jfieldID ${field_reference_name}FieldId = (*env)->GetFieldID(env, ${class_ref_name}Class, "${field_reference_name}", "${jni_signature}");
+    {
+        jclass ${field_reference_name}Class = (*env)->FindClass(env, "${jni_name}");
+        jobjectArray ${field_reference_name} = (*env)->NewObjectArray(env, ${field_length}, ${field_reference_name}Class, 0);
+        jmethodID ${field_reference_name}Constructor = (*env)->GetStaticMethodID(env, ${field_reference_name}Class, "forValue", "(${jni_signature_enum_value})${jni_signature}");
+        unsigned int _i;
+        for (_i = 0; _i < ${field_length}; _i++) {
+            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]));
+            (*env)->SetObjectArrayElement(env, ${field_reference_name}, _i, ${field_reference_name}ArrayElement);
+            (*env)->DeleteLocalRef(env, ${field_reference_name}ArrayElement);
+        }
+        (*env)->SetObjectField(env, ${object_ref_name}, ${field_reference_name}FieldId, ${field_reference_name});
+        (*env)->DeleteLocalRef(env, ${field_reference_name});
+    }
+""")
+
+
+def _generate_c2j_primitive_type_array_swap(msg_java_name, field, object_ref_name, struct_ref_name):
+    field_type = field.type
+    return _C2J_PRIMITIVE_TYPE_ARRAY_SWAP_TEMPLATE.substitute(
+        field_reference_name=field.java_name,
+        class_ref_name=msg_java_name,
+        jni_signature=field_type.jni_signature,
+        jni_type=field_type.jni_type,
+        base_type=field_type.base_type.jni_accessor,
+        field_length=_generate_array_length(field, struct_ref_name),
+        jni_base_type=field_type.base_type.jni_type,
+        object_ref_name=object_ref_name,
+        struct_ref_name=struct_ref_name,
+        net_to_host_function=field_type.net_to_host_function,
+        c_name=field.name
+    )
+
+_C2J_PRIMITIVE_TYPE_ARRAY_SWAP_TEMPLATE = Template("""
+    jfieldID ${field_reference_name}FieldId = (*env)->GetFieldID(env, ${class_ref_name}Class, "${field_reference_name}", "${jni_signature}");
+    {
+        ${jni_type} ${field_reference_name} = (*env)->New${base_type}Array(env, ${field_length});
+        ${jni_base_type} * ${field_reference_name}ArrayElements = (*env)->Get${base_type}ArrayElements(env, ${field_reference_name}, NULL);
+        unsigned int _i;
+        for (_i = 0; _i < ${field_length}; _i++) {
+            ${field_reference_name}ArrayElements[_i] = ${net_to_host_function}(${struct_ref_name}->${c_name}[_i]);
+        }
+
+        (*env)->Release${base_type}ArrayElements(env,  ${field_reference_name}, ${field_reference_name}ArrayElements, 0);
+        (*env)->SetObjectField(env, ${object_ref_name}, ${field_reference_name}FieldId, ${field_reference_name});
+        (*env)->DeleteLocalRef(env, ${field_reference_name});
+    }
+""")
+
+
+def _generate_c2j_primitive_type_array_no_swap(msg_java_name, field, object_ref_name, struct_ref_name, is_alias):
+    field_type = field.type
+    if not is_alias:
+        template = _C2J_PRIMITIVE_TYPE_ARRAY_NO_SWAP_TEMPLATE
+    else:
+        template = _C2J_ALIAS_PRIMITIVE_TYPE_ARRAY_NO_SWAP_TEMPLATE
+    return template.substitute(
+        field_reference_name=field.java_name,
+        class_ref_name=msg_java_name,
+        jni_signature=field_type.jni_signature,
+        jni_type=field_type.jni_type,
+        base_type=field_type.base_type.jni_accessor,
+        field_length=_generate_array_length(field, struct_ref_name),
+        jni_base_type=field_type.base_type.jni_type,
+        object_ref_name=object_ref_name,
+        struct_ref_name=struct_ref_name,
+        c_name=field.name
+    )
+
+_C2J_PRIMITIVE_TYPE_ARRAY_NO_SWAP_TEMPLATE = Template("""
+    jfieldID ${field_reference_name}FieldId = (*env)->GetFieldID(env, ${class_ref_name}Class, "${field_reference_name}", "${jni_signature}");
+    ${jni_type} ${field_reference_name} = (*env)->New${base_type}Array(env, ${field_length});
+    (*env)->Set${base_type}ArrayRegion(env, ${field_reference_name}, 0, ${field_length}, (const ${jni_base_type}*)${struct_ref_name}->${c_name});
+    (*env)->SetObjectField(env, ${object_ref_name}, ${field_reference_name}FieldId, ${field_reference_name});
+    (*env)->DeleteLocalRef(env, ${field_reference_name});
+""")
+
+
+_C2J_ALIAS_PRIMITIVE_TYPE_ARRAY_NO_SWAP_TEMPLATE = Template("""
+    jfieldID ${field_reference_name}FieldId = (*env)->GetFieldID(env, ${class_ref_name}Class, "${field_reference_name}", "${jni_signature}");
+    ${jni_type} ${field_reference_name} = (*env)->New${base_type}Array(env, ${field_length});
+    (*env)->Set${base_type}ArrayRegion(env, ${field_reference_name}, 0, ${field_length}, (const ${jni_base_type}*)${struct_ref_name});
+    (*env)->SetObjectField(env, ${object_ref_name}, ${field_reference_name}FieldId, ${field_reference_name});
+    (*env)->DeleteLocalRef(env, ${field_reference_name});
+""")
+
+
+def _generate_array_length(field, struct_ref_name):
+    if field.array_len_field:
+        len_field = field.array_len_field
+        if len_field.type.is_swap_needed:
+            return "%s(%s->%s)" % (len_field.type.host_to_net_function, struct_ref_name, len_field.name)
+        else:
+            return "%s->%s" % (struct_ref_name, len_field.name)
+    return field.array_len
+
+
+def _generate_c2j_scalar_swap(msg_java_name, field, object_ref_name, struct_ref_name, is_alias):
+    field_type = field.type
+    if field_type.is_swap_needed:
+        # TODO(VPP-1186): move the logic to JNI generators
+        if isinstance(field_type, (Class, Union)):
+            return _generate_c2j_object_swap(msg_java_name, field, object_ref_name, struct_ref_name)
+        elif isinstance(field_type, Enum):
+            return _generate_c2j_enum_swap(msg_java_name, field, object_ref_name, struct_ref_name)
+        else:
+            return _generate_c2j_primitive_type_swap(msg_java_name, field, object_ref_name, struct_ref_name, is_alias)
+    else:
+        return _generate_c2j_primitive_type_no_swap(msg_java_name, field, object_ref_name, struct_ref_name)
+
+
+def _generate_c2j_object_swap(msg_java_name, field, object_ref_name, struct_ref_name):
+    field_type = field.type
+    return _C2J_OBJECT_SWAP_TEMPLATE.substitute(
+        java_name=field.java_name,
+        class_ref_name=msg_java_name,
+        jni_signature=field_type.jni_signature,
+        jni_name=field_type.jni_name,
+        jni_accessor=field_type.jni_accessor,
+        object_ref_name=object_ref_name,
+        struct_ref_name=struct_ref_name,
+        net_to_host_function=field_type.net_to_host_function,
+        c_name=field.name)
+
+_C2J_OBJECT_SWAP_TEMPLATE = Template("""
+    jfieldID ${java_name}FieldId = (*env)->GetFieldID(env, ${class_ref_name}Class, "${java_name}", "${jni_signature}");
+    jclass ${java_name}Class = (*env)->FindClass(env, "${jni_name}");
+    jmethodID ${java_name}Constructor = (*env)->GetMethodID(env, ${java_name}Class, "<init>", "()V");
+    jobject ${java_name} = (*env)->NewObject(env, ${java_name}Class,  ${java_name}Constructor);
+    ${net_to_host_function}(env, &(${struct_ref_name}->${c_name}), ${java_name});
+    (*env)->Set${jni_accessor}Field(env, ${object_ref_name}, ${java_name}FieldId, ${java_name});
+    (*env)->DeleteLocalRef(env, ${java_name});
+""")
+
+
+def _generate_c2j_enum_swap(msg_java_name, field, object_ref_name, struct_ref_name):
+    field_type = field.type
+    return _C2J_ENUM_SWAP_TEMPLATE.substitute(
+        java_name=field.java_name,
+        class_ref_name=msg_java_name,
+        jni_signature=field_type.jni_signature,
+        jni_signature_enum_value=field_type.value.type.jni_signature,
+        jni_name=field_type.jni_name,
+        jni_accessor=field_type.jni_accessor,
+        object_ref_name=object_ref_name,
+        struct_ref_name=struct_ref_name,
+        net_to_host_function=field_type.net_to_host_function,
+        c_name=field.name)
+
+_C2J_ENUM_SWAP_TEMPLATE = Template("""
+    jfieldID ${java_name}FieldId = (*env)->GetFieldID(env, ${class_ref_name}Class, "${java_name}", "${jni_signature}");
+    jclass ${java_name}Class = (*env)->FindClass(env, "${jni_name}");
+    jmethodID ${java_name}Constructor = (*env)->GetStaticMethodID(env, ${java_name}Class, "forValue", "(${jni_signature_enum_value})${jni_signature}");
+    jobject ${java_name} = (*env)->CallStaticObjectMethod(env, ${java_name}Class, ${java_name}Constructor, ${net_to_host_function}(${struct_ref_name}->${c_name}));
+    (*env)->SetObjectField(env, ${object_ref_name}, ${java_name}FieldId, ${java_name});
+    (*env)->DeleteLocalRef(env, ${java_name});
+""")
+
+
+def _generate_c2j_primitive_type_swap(msg_java_name, field, object_ref_name, struct_ref_name, is_alias):
+    field_type = field.type
+    if not is_alias:
+        if field_type.name == "string":
+            template = _C2J_STRING_TYPE_SWAP_TEMPLATE
+        else:
+            template = _C2J_PRIMITIVE_TYPE_SWAP_TEMPLATE
+    else:
+        template = _C2J_ALIAS_PRIMITIVE_TYPE_SWAP_TEMPLATE
+    return template.substitute(
+        java_name=field.java_name,
+        class_ref_name=msg_java_name,
+        jni_signature=field_type.jni_signature,
+        jni_accessor=field_type.jni_accessor,
+        object_ref_name=object_ref_name,
+        net_to_host_function=field_type.net_to_host_function,
+        struct_ref_name=struct_ref_name,
+        c_name=field.name
+    )
+
+_C2J_PRIMITIVE_TYPE_SWAP_TEMPLATE = Template("""
+    jfieldID ${java_name}FieldId = (*env)->GetFieldID(env, ${class_ref_name}Class, "${java_name}", "${jni_signature}");
+    (*env)->Set${jni_accessor}Field(env, ${object_ref_name}, ${java_name}FieldId, ${net_to_host_function}(${struct_ref_name}->${c_name}));
+""")
+
+
+_C2J_STRING_TYPE_SWAP_TEMPLATE = Template("""
+    jfieldID ${java_name}FieldId = (*env)->GetFieldID(env, ${class_ref_name}Class, "${java_name}", "${jni_signature}");
+    (*env)->Set${jni_accessor}Field(env, ${object_ref_name}, ${java_name}FieldId, ${net_to_host_function}(env, (const vl_api_string_t *) &${struct_ref_name}->${c_name}));
+""")
+
+
+_C2J_ALIAS_PRIMITIVE_TYPE_SWAP_TEMPLATE = Template("""
+    jfieldID ${java_name}FieldId = (*env)->GetFieldID(env, ${class_ref_name}Class, "${java_name}", "${jni_signature}");
+    (*env)->Set${jni_accessor}Field(env, ${object_ref_name}, ${java_name}FieldId, ${net_to_host_function}(*${struct_ref_name}));
+""")
+
+
+def _generate_c2j_primitive_type_no_swap(msg_java_name, field, object_ref_name, struct_ref_name):
+    field_type = field.type
+    return _C2J_PRIMITIVE_TYPE_NO_SWAP_TEMPLATE.substitute(
+        java_name=field.java_name,
+        class_ref_name=msg_java_name,
+        jni_signature=field_type.jni_signature,
+        jni_accessor=field_type.jni_accessor,
+        object_ref_name=object_ref_name,
+        struct_ref_name=struct_ref_name,
+        c_name=field.name
+    )
+
+_C2J_PRIMITIVE_TYPE_NO_SWAP_TEMPLATE = Template("""
+    jfieldID ${java_name}FieldId = (*env)->GetFieldID(env, ${class_ref_name}Class, "${java_name}", "${jni_signature}");
+    (*env)->Set${jni_accessor}Field(env, ${object_ref_name}, ${java_name}FieldId, ${struct_ref_name}->${c_name});
+""")