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