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# This Source Code Form is subject to the terms of the Mozilla Public
# License, v. 2.0. If a copy of the MPL was not distributed with this
# file, You can obtain one at http://mozilla.org/MPL/2.0/.
import argparse
import re
STUB_TEMPLATE = '''
typedef %(returnType)s (*%(functionName)s_t)(%(paramTypes)s);
static %(functionName)s_t f_%(functionName)s;
extern "C" NS_EXPORT %(returnType)s JNICALL
%(functionName)s(%(parameterList)s) {
if (!f_%(functionName)s) {
arg0->ThrowNew(arg0->FindClass("java/lang/UnsupportedOperationException"),
"JNI Function called before it was loaded");
return %(returnValue)s;
}
%(returnKeyword)s f_%(functionName)s(%(arguments)s);
}
'''
BINDING_TEMPLATE = ' xul_dlsym("%(functionName)s", &f_%(functionName)s);\n'
class Generator:
"""
Class to convert a javah-produced JNI stub file into stubs/bindings files
for inclusion into mozglue.
"""
def __init__(self, outputfile):
self.outputfile = outputfile
def write(self, guard, stuff):
self.outputfile.write('#ifdef %s\n' % guard)
self.outputfile.write(stuff)
self.outputfile.write('#endif\n\n')
def process(self, inputfile):
self.outputfile.write('/* WARNING - This file is autogenerated by '
+ 'mobile/android/base/jni-generator.py. '
+ 'Do not edit manually! */\n')
# this matches lines such as:
# JNIEXPORT void JNICALL Java_org_mozilla_gecko_GeckoAppShell_onResume
# and extracts the return type and the function name
nameRegex = re.compile('''JNIEXPORT \s+
(?P<returnType>\S+) \s+
JNICALL \s+
(?P<functionName>\S+)''', re.VERBOSE)
# this matches lines such as:
# (JNIEnv *, jclass);
# and extracts everything within the parens; this will be split
# on commas to get the argument types.
paramsRegex = re.compile('\((.*)\);')
for line in inputfile:
line = line.strip()
match = re.match(nameRegex, line)
if match:
returnType = match.group('returnType')
functionName = match.group('functionName')
match = re.match(paramsRegex, line)
if match:
paramTypes = re.split('\s*,\s*', match.group(1))
paramNames = ['arg%d' % i for i in range(0, len(paramTypes))]
if returnType == 'void':
returnValue = ''
elif returnType in ('jobject', 'jstring'):
returnValue = 'NULL'
elif returnType in ('jint', 'jfloat', 'jdouble', 'jlong'):
returnValue = '0'
elif returnType == 'jboolean':
returnValue = 'false'
else:
raise Exception(('Unsupported JNI return type %s found; '
+ 'please update mobile/android/base/'
+ 'jni-generator.py to handle this case!')
% returnType)
self.write('JNI_STUBS', STUB_TEMPLATE % {
'returnType': returnType,
'functionName': functionName,
'paramTypes': ', '.join(paramTypes),
'parameterList': ', '.join('%s %s' % param
for param in zip(paramTypes, paramNames)),
'arguments': ', '.join(paramNames),
'returnValue': returnValue,
'returnKeyword': 'return' if returnType != 'void' else ''})
self.write('JNI_BINDINGS', BINDING_TEMPLATE % {
'functionName': functionName})
def main():
parser = argparse.ArgumentParser(
description='Generate mozglue bindings for JNI functions.')
parser.add_argument('inputfile', type=argparse.FileType('r'))
parser.add_argument('outputfile', type=argparse.FileType('w'))
args = parser.parse_args()
gen = Generator(args.outputfile)
try:
gen.process(args.inputfile)
finally:
args.outputfile.close()
args.inputfile.close()
if __name__ == '__main__':
main()
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