Update from https://crrev.com/317530

base/android/jni_generator/jni_generator.py

 #!/usr/bin/env python
 # Copyright (c) 2012 The Chromium Authors. All rights reserved.
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
 
 """Extracts native methods from a Java file and generates the JNI bindings.
 If you change this, please run and update the tests."""
 
 import collections
 import errno
@@ skipping 871 matching lines @@
       kmethods = self.GetKMethodsString(clazz)
       if kmethods:
         values = {'JAVA_CLASS': clazz,
                   'KMETHODS': kmethods}
         ret += [template.substitute(values)]
     if not ret: return ''
     return '\n' + '\n'.join(ret)
 
   def GetJNINativeMethodsString(self):
     """Returns the implementation of the array of native methods."""
-    if self.options.native_exports:
+    if self.options.native_exports and not self.options.native_exports_optional:
       return ''
     template = Template("""\
 static const JNINativeMethod kMethods${JAVA_CLASS}[] = {
 ${KMETHODS}
 };
 """)
     return self.SubstituteNativeMethods(template)
 
   def GetRegisterCalledByNativesImplString(self):
     """Returns the code for registering the called by native methods."""
@@ skipping 12 matching lines @@
           'METHOD_ID_VAR_NAME': called_by_native.method_id_var_name,
           'GET_METHOD_ID_IMPL': self.GetMethodIDImpl(called_by_native),
       }
       ret += [template.substitute(values)]
     return '\n'.join(ret)
 
   def GetRegisterNativesString(self):
     """Returns the code for RegisterNatives."""
     template = Template("""\
 ${REGISTER_NATIVES_SIGNATURE} {
-${CLASSES}
+${EARLY_EXIT}${CLASSES}
 ${NATIVES}
 ${CALLED_BY_NATIVES}
   return true;
 }
 """)
     signature = 'static bool RegisterNativesImpl(JNIEnv* env'
     if self.init_native:
       signature += ', jclass clazz)'
     else:
       signature += ')'
 
+    early_exit = ''
+    if self.options.native_exports_optional:
+      early_exit = """\
+  if (base::android::IsManualJniRegistrationDisabled()) return true;
+"""
+
     natives = self.GetRegisterNativesImplString()
     called_by_natives = self.GetRegisterCalledByNativesImplString()
     values = {'REGISTER_NATIVES_SIGNATURE': signature,
+              'EARLY_EXIT': early_exit,
               'CLASSES': self.GetFindClasses(),
               'NATIVES': natives,
               'CALLED_BY_NATIVES': called_by_natives,
              }
     return template.substitute(values)
 
   def GetRegisterNativesImplString(self):
     """Returns the shared implementation for RegisterNatives."""
-    if self.options.native_exports:
+    if self.options.native_exports and not self.options.native_exports_optional:
       return ''
 
     template = Template("""\
   const int kMethods${JAVA_CLASS}Size = arraysize(kMethods${JAVA_CLASS});
 
   if (env->RegisterNatives(${JAVA_CLASS}_clazz(env),
                            kMethods${JAVA_CLASS},
                            kMethods${JAVA_CLASS}Size) < 0) {
     jni_generator::HandleRegistrationError(
         env, ${JAVA_CLASS}_clazz(env), __FILE__);
@@ skipping 69 matching lines @@
                           [JavaDataTypeToC(param.datatype) + ' ' +
                            param.name
                            for param in native.params])
 
   def GetCalledByNativeParamsInDeclaration(self, called_by_native):
     return ',\n    '.join([
         JavaDataTypeToCForCalledByNativeParam(param.datatype) + ' ' +
         param.name
         for param in called_by_native.params])
 
+  def GetStubName(self, native):
+    """Return the name of the stub function for this native method.
+
+    Args:
+      native: the native dictionary describing the method.
+
+    Returns:
+      A string with the stub function name. For native exports mode this is the
+      Java_* symbol name required by the JVM; otherwise it is just the name of
+      the native method itself.
+    """
+    if self.options.native_exports:
+      template = Template("Java_${JAVA_NAME}_native${NAME}")
+
+      java_name = JniParams.RemapClassName(self.fully_qualified_class)
+      java_name = java_name.replace('_', '_1').replace('/', '_')
+      if native.java_class_name:
+        java_name += '_00024' + native.java_class_name
+
+      values = {'NAME': native.name,
+                'JAVA_NAME': java_name}
+      return template.substitute(values)
+    else:
+      return native.name
+
   def GetForwardDeclaration(self, native):
     template_str = """
 static ${RETURN} ${NAME}(JNIEnv* env, ${PARAMS});
 """
     if self.options.native_exports:
       template_str += """
 __attribute__((visibility("default"), alias("${NAME}")))
-${RETURN} Java_${JAVA_NAME}_native${NAME}(JNIEnv* env, ${PARAMS});
+${RETURN} ${STUB_NAME}(JNIEnv* env, ${PARAMS});
 """
     template = Template(template_str)
     params_in_call = []
     if not self.options.pure_native_methods:
       params_in_call = ['env', 'jcaller']
     params_in_call = ', '.join(params_in_call + [p.name for p in native.params])
 
-    java_name = JniParams.RemapClassName(self.fully_qualified_class)
-    java_name = java_name.replace('_', '_1').replace('/', '_')
-    if native.java_class_name:
-      java_name += '_00024' + native.java_class_name
-
     values = {'RETURN': JavaDataTypeToC(native.return_type),
               'NAME': native.name,
-              'JAVA_NAME': java_name,
               'PARAMS': self.GetParamsInDeclaration(native),
-              'PARAMS_IN_CALL': params_in_call}
+              'PARAMS_IN_CALL': params_in_call,
+              'STUB_NAME': self.GetStubName(native)}
     return template.substitute(values)
 
   def GetNativeMethodStubString(self, native):
     """Returns stubs for native methods."""
     if self.options.native_exports:
       template_str = """\
 __attribute__((visibility("default")))
-${RETURN} Java_${JAVA_NAME}_native${NAME}(JNIEnv* env,
+${RETURN} ${STUB_NAME}(JNIEnv* env,
     ${PARAMS_IN_DECLARATION}) {"""
     else:
       template_str = """\
-static ${RETURN} ${NAME}(JNIEnv* env, ${PARAMS_IN_DECLARATION}) {"""
+static ${RETURN} ${STUB_NAME}(JNIEnv* env, ${PARAMS_IN_DECLARATION}) {"""
     template_str += """
   ${P0_TYPE}* native = reinterpret_cast<${P0_TYPE}*>(${PARAM0_NAME});
   CHECK_NATIVE_PTR(env, jcaller, native, "${NAME}"${OPTIONAL_ERROR_RETURN});
   return native->${NAME}(${PARAMS_IN_CALL})${POST_CALL};
 }
 """
 
     template = Template(template_str)
     params = []
     if not self.options.pure_native_methods:
       params = ['env', 'jcaller']
     params_in_call = ', '.join(params + [p.name for p in native.params[1:]])
 
     return_type = JavaDataTypeToC(native.return_type)
     optional_error_return = JavaReturnValueToC(native.return_type)
     if optional_error_return:
       optional_error_return = ', ' + optional_error_return
     post_call = ''
     if re.match(RE_SCOPED_JNI_RETURN_TYPES, return_type):
       post_call = '.Release()'
 
-    if self.options.native_exports:
-      java_name = JniParams.RemapClassName(self.fully_qualified_class)
-      java_name = java_name.replace('_', '_1').replace('/', '_')
-      if native.java_class_name:
-        java_name += '_00024' + native.java_class_name
-    else:
-      java_name = ''
-
     values = {
         'RETURN': return_type,
         'OPTIONAL_ERROR_RETURN': optional_error_return,
-        'JAVA_NAME': java_name,
         'NAME': native.name,
         'PARAMS_IN_DECLARATION': self.GetParamsInDeclaration(native),
         'PARAM0_NAME': native.params[0].name,
         'P0_TYPE': native.p0_type,
         'PARAMS_IN_CALL': params_in_call,
-        'POST_CALL': post_call
+        'POST_CALL': post_call,
+        'STUB_NAME': self.GetStubName(native),
     }
     return template.substitute(values)
 
   def GetArgument(self, param):
     return ('as_jint(' + param.name + ')'
             if param.datatype == 'int' else param.name)
 
   def GetArgumentsInCall(self, params):
     """Return a string of arguments to call from native into Java"""
     return [self.GetArgument(p) for p in params]
@@ skipping 94 matching lines @@
     values['FUNCTION_SIGNATURE'] = (
         function_signature_template.substitute(values))
     if called_by_native.system_class:
       values['FUNCTION_HEADER'] = (
           function_header_with_unused_template.substitute(values))
     else:
       values['FUNCTION_HEADER'] = function_header_template.substitute(values)
     return template.substitute(values)
 
   def GetKMethodArrayEntry(self, native):
-    template = Template("""\
-    { "native${NAME}", ${JNI_SIGNATURE}, reinterpret_cast<void*>(${NAME}) },""")
+    template = Template('    { "native${NAME}", ${JNI_SIGNATURE}, ' +
+                        'reinterpret_cast<void*>(${STUB_NAME}) },')
     values = {'NAME': native.name,
               'JNI_SIGNATURE': JniParams.Signature(native.params,
                                                    native.return_type,
-                                                   True)}
+                                                   True),
+              'STUB_NAME': self.GetStubName(native)}
     return template.substitute(values)
 
   def GetUniqueClasses(self, origin):
     ret = {self.class_name: self.fully_qualified_class}
     for entry in origin:
       class_name = self.class_name
       jni_class_path = self.fully_qualified_class
       if entry.java_class_name:
         class_name = entry.java_class_name
         jni_class_path = self.fully_qualified_class + '$' + class_name
@@ skipping 249 matching lines @@
                            action='store_true', dest='eager_called_by_natives',
                            help='When true, the called-by-native methods will '
                            'be initialized in a non-atomic way.')
   option_parser.add_option('--cpp', default='cpp',
                            help='The path to cpp command.')
   option_parser.add_option('--javap', default='javap',
                            help='The path to javap command.')
   option_parser.add_option('--native_exports', action='store_true',
                            help='Native method registration through .so '
                            'exports.')
+  option_parser.add_option('--native_exports_optional', action='store_true',
+                           help='Support both explicit and native method'
+                           'registration.')
   options, args = option_parser.parse_args(argv)
+  if options.native_exports_optional:
+    options.native_exports = True
   if options.jar_file:
     input_file = ExtractJarInputFile(options.jar_file, options.input_file,
                                      options.output_dir)
   elif options.input_file:
     input_file = options.input_file
   else:
     option_parser.print_help()
     print '\nError: Must specify --jar_file or --input_file.'
     return 1
   output_file = None
   if options.output_dir:
     root_name = os.path.splitext(os.path.basename(input_file))[0]
     output_file = os.path.join(options.output_dir, root_name) + '_jni.h'
   if options.jarjar:
     with open(options.jarjar) as f:
       JniParams.SetJarJarMappings(f.read())
   GenerateJNIHeader(input_file, output_file, options)
 
   if options.depfile:
     build_utils.WriteDepfile(
         options.depfile,
         build_utils.GetPythonDependencies())
 
 
 if __name__ == '__main__':
   sys.exit(main(sys.argv))