cpython/Tools/scripts/abitype.py at pythoncapi · pythoncapi/cpython · GitHub

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#!/usr/bin/env python3

# This script converts a C file to use the PEP 384 type definition API

# Usage: abitype.py < old_code > new_code

import re, sys

###### Replacement of PyTypeObject static instances ##############

# classify each token, giving it a one-letter code:

# S: static

# T: PyTypeObject

# I: ident

# W: whitespace

# =, {, }, ; : themselves

def classify():

res = []

for t,v in tokens:

if t == 'other' and v in "={};":

res.append(v)

elif t == 'ident':

if v == 'PyTypeObject':

res.append('T')

elif v == 'static':

res.append('S')

else:

res.append('I')

elif t == 'ws':

res.append('W')

else:

res.append('.')

return ''.join(res)

# Obtain a list of fields of a PyTypeObject, in declaration order,

# skipping ob_base

# All comments are dropped from the variable (which are typically

# just the slot names, anyway), and information is discarded whether

# the original type was static.

def get_fields(start, real_end):

pos = start

# static?

if tokens[pos][1] == 'static':

pos += 2

# PyTypeObject

pos += 2

# name

name = tokens[pos][1]

pos += 1

while tokens[pos][1] != '{':

pos += 1

# PyVarObject_HEAD_INIT

while tokens[pos][0] in ('ws', 'comment'):

pos += 1

if tokens[pos][1] != 'PyVarObject_HEAD_INIT':

raise Exception('%s has no PyVarObject_HEAD_INIT' % name)

while tokens[pos][1] != ')':

pos += 1

# field definitions: various tokens, comma-separated

fields = []

while True:

while tokens[pos][0] in ('ws', 'comment'):

pos += 1

end = pos

while tokens[end][1] not in ',}':

if tokens[end][1] == '(':

nesting = 1

while nesting:

end += 1

if tokens[end][1] == '(': nesting+=1

if tokens[end][1] == ')': nesting-=1

end += 1

assert end < real_end

# join field, excluding separator and trailing ws

end1 = end-1

while tokens[end1][0] in ('ws', 'comment'):

end1 -= 1

fields.append(''.join(t[1] for t in tokens[pos:end1+1]))

if tokens[end][1] == '}':

break

pos = end+1

return name, fields

# List of type slots as of Python 3.2, omitting ob_base

typeslots = [

'tp_name',

'tp_basicsize',

'tp_itemsize',

'tp_dealloc',

'tp_print',

'tp_getattr',

'tp_setattr',

'tp_reserved',

'tp_repr',

'tp_as_number',

'tp_as_sequence',

'tp_as_mapping',

'tp_hash',

'tp_call',

'tp_str',

'tp_getattro',

'tp_setattro',

'tp_as_buffer',

'tp_flags',

'tp_doc',

'tp_traverse',

'tp_clear',

'tp_richcompare',

'tp_weaklistoffset',

'tp_iter',

'iternextfunc',

'tp_methods',

'tp_members',

'tp_getset',

'tp_base',

'tp_dict',

'tp_descr_get',

'tp_descr_set',

'tp_dictoffset',

'tp_init',

'tp_alloc',

'tp_new',

'tp_free',

'tp_is_gc',

'tp_bases',

'tp_mro',

'tp_cache',

'tp_subclasses',

'tp_weaklist',

'tp_del',

'tp_version_tag',

]

# Generate a PyType_Spec definition

def make_slots(name, fields):

res = []

res.append('static PyType_Slot %s_slots[] = {' % name)

# defaults for spec

spec = { 'tp_itemsize':'0' }

for i, val in enumerate(fields):

if val.endswith('0'):

continue

if typeslots[i] in ('tp_name', 'tp_doc', 'tp_basicsize',

'tp_itemsize', 'tp_flags'):

spec[typeslots[i]] = val

continue

res.append(' {Py_%s, %s},' % (typeslots[i], val))

res.append('};')

res.append('static PyType_Spec %s_spec = {' % name)

res.append(' %s,' % spec['tp_name'])

res.append(' %s,' % spec['tp_basicsize'])

res.append(' %s,' % spec['tp_itemsize'])

res.append(' %s,' % spec['tp_flags'])

res.append(' %s_slots,' % name)

res.append('};\n')

return '\n'.join(res)

if __name__ == '__main__':

############ Simplistic C scanner ##################################

tokenizer = re.compile(

r"(?P<preproc>#.*\n)"

r"|(?P<comment>/\*.*?\*/)"

r"|(?P<ident>[a-zA-Z_][a-zA-Z0-9_]*)"

r"|(?P<ws>[ \t\n]+)"

r"|(?P<other>.)",

re.MULTILINE)

tokens = []

source = sys.stdin.read()

pos = 0

while pos != len(source):

m = tokenizer.match(source, pos)

tokens.append([m.lastgroup, m.group()])

pos += len(tokens[-1][1])

if tokens[-1][0] == 'preproc':

# continuation lines are considered

# only in preprocess statements

while tokens[-1][1].endswith('\\\n'):

nl = source.find('\n', pos)

if nl == -1:

line = source[pos:]

else:

line = source[pos:nl+1]

tokens[-1][1] += line

pos += len(line)

# Main loop: replace all static PyTypeObjects until

# there are none left.

while 1:

c = classify()

m = re.search('(SW)?TWIW?=W?{.*?};', c)

if not m:

break

start = m.start()

end = m.end()

name, fields = get_fields(start, end)

tokens[start:end] = [('',make_slots(name, fields))]

# Output result to stdout

for t, v in tokens:

sys.stdout.write(v)

cpython/Tools/scripts/abitype.py at pythoncapi · pythoncapi/cpython · GitHub

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