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#!/usr/bin/env python3
"""apis_generator.py - Generate a C++ interface that automates loading OpenCL.
Usage: apis_generator.py <headerPaths...>
The generated code looks roughly like this:
------------------------------------------------------------------------
// apis.h
CL_MACRO ( returnType, funcname, (fargs...), (callArgs...) )
"""
import os.path
import re
import sys
GENERATED_FILE_WARNING = """
/*
* This file is generated by {}
* Do not edit this file directly.
*/""".format(os.path.basename(__file__))
MACRO_GUARD = """
#ifndef CL_MACRO
#error You need to define CL_MACRO before including apis
#endif"""
def include_for_header(header):
return '#include <CL/{}>'.format(header)
def extract_license_lines(lines):
license_lines = []
for line in lines:
license_lines.append(line)
if line.find('*/') != -1:
return license_lines
sys.exit("License text didn't terminate")
assert (extract_license_lines(['/* LICENSE */',
'something']) == ['/* LICENSE */'])
assert (extract_license_lines(['/* LICENSE', ' * TEXT */',
'something']) == ['/* LICENSE', ' * TEXT */'])
assert (extract_license_lines(['/* LICENSE', ' * TEXT', ' */', 'something'
]) == ['/* LICENSE', ' * TEXT', ' */'])
def parse_arg_strs(str):
paren_depth = 0
current_arg = ''
ret = []
for c in str:
if c == '(':
paren_depth += 1
elif c == ')':
paren_depth -= 1
if c == ',' and paren_depth == 0:
ret.append(current_arg)
current_arg = ''
else:
current_arg += c
if current_arg != '':
ret.append(current_arg)
return ret
def process_type(raw):
# strip redundant [] (where one is before the name)
raw = re.sub(r'(\[[0-9]*\])\s*(\w+)\s*\[[0-9]*\]', r'\2\1', raw)
# strip cases where the name comment hinted at the number of elements in an array
raw = re.sub(r'\*\s*(\w+)\s*\[[0-9]+\]', r'*\1', raw)
raw = ' '.join(raw.split())
return raw
def parse_api(api_signature):
m = None
api_signature = re.sub(r'\bextern\b', '', api_signature)
api_signature = re.sub('CL_\w+', '', api_signature)
m = re.match(r'\s*(.*)\s+(\w+)\((.*)\)\s*;', api_signature)
if m == None:
print(api_signature)
assert (m is not None)
assert (len(m.groups()) == 3)
arg_strs = None
if re.match('\s*void\s*', m.group(3)):
arg_strs = []
else:
arg_strs = parse_arg_strs(m.group(3))
args = []
for arg_str in arg_strs:
nm = re.search(r'(\w+)\s*(\)|\[|$)', arg_str)
assert (nm is not None)
args.append({'type': process_type(arg_str), 'name': nm.group(1)})
return {'return': m.group(1).strip(), 'name': m.group(2), 'args': args}
def extract_apis(lines):
state = 'scanning'
apis = []
api_signature = ''
for line in lines:
if state == 'scanning':
if line.find('CL_API_ENTRY') != -1 and line.find('typedef') == -1:
api_signature = line
if line.find(';') != -1:
apis.append(
parse_api(
api_signature.replace('/*', '').replace('*/', '').replace(
'CL_CALLBACK ', '')))
api_signature = ''
else:
state = 'expectAPILine'
elif state == 'expectAPILine':
api_signature += ' ' + line
if line.find(';') != -1:
apis.append(
parse_api(
api_signature.replace('/*', '').replace('*/', '').replace(
'CL_CALLBACK ', '')))
api_signature = ''
state = 'scanning'
return apis
def generate_apis(apis):
print(GENERATED_FILE_WARNING)
print()
print(MACRO_GUARD)
print()
for api in apis:
fargs = (arg['type'] for arg in api['args'])
cargs = (arg['name'] for arg in api['args'])
print('CL_MACRO( {}, {}, ({}), ({}) )\n'.format(api['return'], api['name'],
', '.join(fargs),
', '.join(cargs)))
def main():
headers = sys.argv[1:]
apis = []
with open(headers[0]) as header:
lines = [line.strip() for line in header.readlines()]
license_lines = extract_license_lines(lines)
for header_name in headers:
with open(header_name) as header:
lines = [line.strip() for line in header.readlines()]
apis = apis + extract_apis(lines)
generate_apis(apis)
if __name__ == '__main__':
main()
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