mirror of https://github.com/python/cpython
521 lines
15 KiB
Python
521 lines
15 KiB
Python
########################################################################
|
|
# Copyright (c) 2000, BeOpen.com.
|
|
# Copyright (c) 1995-2000, Corporation for National Research Initiatives.
|
|
# Copyright (c) 1990-1995, Stichting Mathematisch Centrum.
|
|
# All rights reserved.
|
|
#
|
|
# See the file "Misc/COPYRIGHT" for information on usage and
|
|
# redistribution of this file, and for a DISCLAIMER OF ALL WARRANTIES.
|
|
########################################################################
|
|
|
|
# Python script to parse cstubs file for gl and generate C stubs.
|
|
# usage: python cgen.py <cstubs >glmodule.c
|
|
#
|
|
# NOTE: You must first make a python binary without the "GL" option
|
|
# before you can run this, when building Python for the first time.
|
|
# See comments in the Makefile.
|
|
#
|
|
# XXX BUG return arrays generate wrong code
|
|
# XXX need to change error returns into gotos to free mallocked arrays
|
|
|
|
|
|
import string
|
|
import sys
|
|
|
|
|
|
# Function to print to stderr
|
|
#
|
|
def err(*args):
|
|
savestdout = sys.stdout
|
|
try:
|
|
sys.stdout = sys.stderr
|
|
for i in args:
|
|
print i,
|
|
print
|
|
finally:
|
|
sys.stdout = savestdout
|
|
|
|
|
|
# The set of digits that form a number
|
|
#
|
|
digits = '0123456789'
|
|
|
|
|
|
# Function to extract a string of digits from the front of the string.
|
|
# Returns the leading string of digits and the remaining string.
|
|
# If no number is found, returns '' and the original string.
|
|
#
|
|
def getnum(s):
|
|
n = ''
|
|
while s and s[0] in digits:
|
|
n = n + s[0]
|
|
s = s[1:]
|
|
return n, s
|
|
|
|
|
|
# Function to check if a string is a number
|
|
#
|
|
def isnum(s):
|
|
if not s: return False
|
|
for c in s:
|
|
if not c in digits: return False
|
|
return True
|
|
|
|
|
|
# Allowed function return types
|
|
#
|
|
return_types = ['void', 'short', 'long']
|
|
|
|
|
|
# Allowed function argument types
|
|
#
|
|
arg_types = ['char', 'string', 'short', 'u_short', 'float', 'long', 'double']
|
|
|
|
|
|
# Need to classify arguments as follows
|
|
# simple input variable
|
|
# simple output variable
|
|
# input array
|
|
# output array
|
|
# input giving size of some array
|
|
#
|
|
# Array dimensions can be specified as follows
|
|
# constant
|
|
# argN
|
|
# constant * argN
|
|
# retval
|
|
# constant * retval
|
|
#
|
|
# The dimensions given as constants * something are really
|
|
# arrays of points where points are 2- 3- or 4-tuples
|
|
#
|
|
# We have to consider three lists:
|
|
# python input arguments
|
|
# C stub arguments (in & out)
|
|
# python output arguments (really return values)
|
|
#
|
|
# There is a mapping from python input arguments to the input arguments
|
|
# of the C stub, and a further mapping from C stub arguments to the
|
|
# python return values
|
|
|
|
|
|
# Exception raised by checkarg() and generate()
|
|
#
|
|
arg_error = 'bad arg'
|
|
|
|
|
|
# Function to check one argument.
|
|
# Arguments: the type and the arg "name" (really mode plus subscript).
|
|
# Raises arg_error if something's wrong.
|
|
# Return type, mode, factor, rest of subscript; factor and rest may be empty.
|
|
#
|
|
def checkarg(type, arg):
|
|
#
|
|
# Turn "char *x" into "string x".
|
|
#
|
|
if type == 'char' and arg[0] == '*':
|
|
type = 'string'
|
|
arg = arg[1:]
|
|
#
|
|
# Check that the type is supported.
|
|
#
|
|
if type not in arg_types:
|
|
raise arg_error, ('bad type', type)
|
|
if type[:2] == 'u_':
|
|
type = 'unsigned ' + type[2:]
|
|
#
|
|
# Split it in the mode (first character) and the rest.
|
|
#
|
|
mode, rest = arg[:1], arg[1:]
|
|
#
|
|
# The mode must be 's' for send (= input) or 'r' for return argument.
|
|
#
|
|
if mode not in ('r', 's'):
|
|
raise arg_error, ('bad arg mode', mode)
|
|
#
|
|
# Is it a simple argument: if so, we are done.
|
|
#
|
|
if not rest:
|
|
return type, mode, '', ''
|
|
#
|
|
# Not a simple argument; must be an array.
|
|
# The 'rest' must be a subscript enclosed in [ and ].
|
|
# The subscript must be one of the following forms,
|
|
# otherwise we don't handle it (where N is a number):
|
|
# N
|
|
# argN
|
|
# retval
|
|
# N*argN
|
|
# N*retval
|
|
#
|
|
if rest[:1] <> '[' or rest[-1:] <> ']':
|
|
raise arg_error, ('subscript expected', rest)
|
|
sub = rest[1:-1]
|
|
#
|
|
# Is there a leading number?
|
|
#
|
|
num, sub = getnum(sub)
|
|
if num:
|
|
# There is a leading number
|
|
if not sub:
|
|
# The subscript is just a number
|
|
return type, mode, num, ''
|
|
if sub[:1] == '*':
|
|
# There is a factor prefix
|
|
sub = sub[1:]
|
|
else:
|
|
raise arg_error, ('\'*\' expected', sub)
|
|
if sub == 'retval':
|
|
# size is retval -- must be a reply argument
|
|
if mode <> 'r':
|
|
raise arg_error, ('non-r mode with [retval]', mode)
|
|
elif not isnum(sub) and (sub[:3] <> 'arg' or not isnum(sub[3:])):
|
|
raise arg_error, ('bad subscript', sub)
|
|
#
|
|
return type, mode, num, sub
|
|
|
|
|
|
# List of functions for which we have generated stubs
|
|
#
|
|
functions = []
|
|
|
|
|
|
# Generate the stub for the given function, using the database of argument
|
|
# information build by successive calls to checkarg()
|
|
#
|
|
def generate(type, func, database):
|
|
#
|
|
# Check that we can handle this case:
|
|
# no variable size reply arrays yet
|
|
#
|
|
n_in_args = 0
|
|
n_out_args = 0
|
|
#
|
|
for a_type, a_mode, a_factor, a_sub in database:
|
|
if a_mode == 's':
|
|
n_in_args = n_in_args + 1
|
|
elif a_mode == 'r':
|
|
n_out_args = n_out_args + 1
|
|
else:
|
|
# Can't happen
|
|
raise arg_error, ('bad a_mode', a_mode)
|
|
if (a_mode == 'r' and a_sub) or a_sub == 'retval':
|
|
err('Function', func, 'too complicated:',
|
|
a_type, a_mode, a_factor, a_sub)
|
|
print '/* XXX Too complicated to generate code for */'
|
|
return
|
|
#
|
|
functions.append(func)
|
|
#
|
|
# Stub header
|
|
#
|
|
print
|
|
print 'static PyObject *'
|
|
print 'gl_' + func + '(self, args)'
|
|
print '\tPyObject *self;'
|
|
print '\tPyObject *args;'
|
|
print '{'
|
|
#
|
|
# Declare return value if any
|
|
#
|
|
if type <> 'void':
|
|
print '\t' + type, 'retval;'
|
|
#
|
|
# Declare arguments
|
|
#
|
|
for i in range(len(database)):
|
|
a_type, a_mode, a_factor, a_sub = database[i]
|
|
print '\t' + a_type,
|
|
brac = ket = ''
|
|
if a_sub and not isnum(a_sub):
|
|
if a_factor:
|
|
brac = '('
|
|
ket = ')'
|
|
print brac + '*',
|
|
print 'arg' + repr(i+1) + ket,
|
|
if a_sub and isnum(a_sub):
|
|
print '[', a_sub, ']',
|
|
if a_factor:
|
|
print '[', a_factor, ']',
|
|
print ';'
|
|
#
|
|
# Find input arguments derived from array sizes
|
|
#
|
|
for i in range(len(database)):
|
|
a_type, a_mode, a_factor, a_sub = database[i]
|
|
if a_mode == 's' and a_sub[:3] == 'arg' and isnum(a_sub[3:]):
|
|
# Sending a variable-length array
|
|
n = eval(a_sub[3:])
|
|
if 1 <= n <= len(database):
|
|
b_type, b_mode, b_factor, b_sub = database[n-1]
|
|
if b_mode == 's':
|
|
database[n-1] = b_type, 'i', a_factor, repr(i)
|
|
n_in_args = n_in_args - 1
|
|
#
|
|
# Assign argument positions in the Python argument list
|
|
#
|
|
in_pos = []
|
|
i_in = 0
|
|
for i in range(len(database)):
|
|
a_type, a_mode, a_factor, a_sub = database[i]
|
|
if a_mode == 's':
|
|
in_pos.append(i_in)
|
|
i_in = i_in + 1
|
|
else:
|
|
in_pos.append(-1)
|
|
#
|
|
# Get input arguments
|
|
#
|
|
for i in range(len(database)):
|
|
a_type, a_mode, a_factor, a_sub = database[i]
|
|
if a_type[:9] == 'unsigned ':
|
|
xtype = a_type[9:]
|
|
else:
|
|
xtype = a_type
|
|
if a_mode == 'i':
|
|
#
|
|
# Implicit argument;
|
|
# a_factor is divisor if present,
|
|
# a_sub indicates which arg (`database index`)
|
|
#
|
|
j = eval(a_sub)
|
|
print '\tif',
|
|
print '(!geti' + xtype + 'arraysize(args,',
|
|
print repr(n_in_args) + ',',
|
|
print repr(in_pos[j]) + ',',
|
|
if xtype <> a_type:
|
|
print '('+xtype+' *)',
|
|
print '&arg' + repr(i+1) + '))'
|
|
print '\t\treturn NULL;'
|
|
if a_factor:
|
|
print '\targ' + repr(i+1),
|
|
print '= arg' + repr(i+1),
|
|
print '/', a_factor + ';'
|
|
elif a_mode == 's':
|
|
if a_sub and not isnum(a_sub):
|
|
# Allocate memory for varsize array
|
|
print '\tif ((arg' + repr(i+1), '=',
|
|
if a_factor:
|
|
print '('+a_type+'(*)['+a_factor+'])',
|
|
print 'PyMem_NEW(' + a_type, ',',
|
|
if a_factor:
|
|
print a_factor, '*',
|
|
print a_sub, ')) == NULL)'
|
|
print '\t\treturn PyErr_NoMemory();'
|
|
print '\tif',
|
|
if a_factor or a_sub: # Get a fixed-size array array
|
|
print '(!geti' + xtype + 'array(args,',
|
|
print repr(n_in_args) + ',',
|
|
print repr(in_pos[i]) + ',',
|
|
if a_factor: print a_factor,
|
|
if a_factor and a_sub: print '*',
|
|
if a_sub: print a_sub,
|
|
print ',',
|
|
if (a_sub and a_factor) or xtype <> a_type:
|
|
print '('+xtype+' *)',
|
|
print 'arg' + repr(i+1) + '))'
|
|
else: # Get a simple variable
|
|
print '(!geti' + xtype + 'arg(args,',
|
|
print repr(n_in_args) + ',',
|
|
print repr(in_pos[i]) + ',',
|
|
if xtype <> a_type:
|
|
print '('+xtype+' *)',
|
|
print '&arg' + repr(i+1) + '))'
|
|
print '\t\treturn NULL;'
|
|
#
|
|
# Begin of function call
|
|
#
|
|
if type <> 'void':
|
|
print '\tretval =', func + '(',
|
|
else:
|
|
print '\t' + func + '(',
|
|
#
|
|
# Argument list
|
|
#
|
|
for i in range(len(database)):
|
|
if i > 0: print ',',
|
|
a_type, a_mode, a_factor, a_sub = database[i]
|
|
if a_mode == 'r' and not a_factor:
|
|
print '&',
|
|
print 'arg' + repr(i+1),
|
|
#
|
|
# End of function call
|
|
#
|
|
print ');'
|
|
#
|
|
# Free varsize arrays
|
|
#
|
|
for i in range(len(database)):
|
|
a_type, a_mode, a_factor, a_sub = database[i]
|
|
if a_mode == 's' and a_sub and not isnum(a_sub):
|
|
print '\tPyMem_DEL(arg' + repr(i+1) + ');'
|
|
#
|
|
# Return
|
|
#
|
|
if n_out_args:
|
|
#
|
|
# Multiple return values -- construct a tuple
|
|
#
|
|
if type <> 'void':
|
|
n_out_args = n_out_args + 1
|
|
if n_out_args == 1:
|
|
for i in range(len(database)):
|
|
a_type, a_mode, a_factor, a_sub = database[i]
|
|
if a_mode == 'r':
|
|
break
|
|
else:
|
|
raise arg_error, 'expected r arg not found'
|
|
print '\treturn',
|
|
print mkobject(a_type, 'arg' + repr(i+1)) + ';'
|
|
else:
|
|
print '\t{ PyObject *v = PyTuple_New(',
|
|
print n_out_args, ');'
|
|
print '\t if (v == NULL) return NULL;'
|
|
i_out = 0
|
|
if type <> 'void':
|
|
print '\t PyTuple_SetItem(v,',
|
|
print repr(i_out) + ',',
|
|
print mkobject(type, 'retval') + ');'
|
|
i_out = i_out + 1
|
|
for i in range(len(database)):
|
|
a_type, a_mode, a_factor, a_sub = database[i]
|
|
if a_mode == 'r':
|
|
print '\t PyTuple_SetItem(v,',
|
|
print repr(i_out) + ',',
|
|
s = mkobject(a_type, 'arg' + repr(i+1))
|
|
print s + ');'
|
|
i_out = i_out + 1
|
|
print '\t return v;'
|
|
print '\t}'
|
|
else:
|
|
#
|
|
# Simple function return
|
|
# Return None or return value
|
|
#
|
|
if type == 'void':
|
|
print '\tPy_INCREF(Py_None);'
|
|
print '\treturn Py_None;'
|
|
else:
|
|
print '\treturn', mkobject(type, 'retval') + ';'
|
|
#
|
|
# Stub body closing brace
|
|
#
|
|
print '}'
|
|
|
|
|
|
# Subroutine to return a function call to mknew<type>object(<arg>)
|
|
#
|
|
def mkobject(type, arg):
|
|
if type[:9] == 'unsigned ':
|
|
type = type[9:]
|
|
return 'mknew' + type + 'object((' + type + ') ' + arg + ')'
|
|
return 'mknew' + type + 'object(' + arg + ')'
|
|
|
|
|
|
defined_archs = []
|
|
|
|
# usage: cgen [ -Dmach ... ] [ file ]
|
|
for arg in sys.argv[1:]:
|
|
if arg[:2] == '-D':
|
|
defined_archs.append(arg[2:])
|
|
else:
|
|
# Open optional file argument
|
|
sys.stdin = open(arg, 'r')
|
|
|
|
|
|
# Input line number
|
|
lno = 0
|
|
|
|
|
|
# Input is divided in two parts, separated by a line containing '%%'.
|
|
# <part1> -- literally copied to stdout
|
|
# <part2> -- stub definitions
|
|
|
|
# Variable indicating the current input part.
|
|
#
|
|
part = 1
|
|
|
|
# Main loop over the input
|
|
#
|
|
while 1:
|
|
try:
|
|
line = raw_input()
|
|
except EOFError:
|
|
break
|
|
#
|
|
lno = lno+1
|
|
words = string.split(line)
|
|
#
|
|
if part == 1:
|
|
#
|
|
# In part 1, copy everything literally
|
|
# except look for a line of just '%%'
|
|
#
|
|
if words == ['%%']:
|
|
part = part + 1
|
|
else:
|
|
#
|
|
# Look for names of manually written
|
|
# stubs: a single percent followed by the name
|
|
# of the function in Python.
|
|
# The stub name is derived by prefixing 'gl_'.
|
|
#
|
|
if words and words[0][0] == '%':
|
|
func = words[0][1:]
|
|
if (not func) and words[1:]:
|
|
func = words[1]
|
|
if func:
|
|
functions.append(func)
|
|
else:
|
|
print line
|
|
continue
|
|
if not words:
|
|
continue # skip empty line
|
|
elif words[0] == 'if':
|
|
# if XXX rest
|
|
# if !XXX rest
|
|
if words[1][0] == '!':
|
|
if words[1][1:] in defined_archs:
|
|
continue
|
|
elif words[1] not in defined_archs:
|
|
continue
|
|
words = words[2:]
|
|
if words[0] == '#include':
|
|
print line
|
|
elif words[0][:1] == '#':
|
|
pass # ignore comment
|
|
elif words[0] not in return_types:
|
|
err('Line', lno, ': bad return type :', words[0])
|
|
elif len(words) < 2:
|
|
err('Line', lno, ': no funcname :', line)
|
|
else:
|
|
if len(words) % 2 <> 0:
|
|
err('Line', lno, ': odd argument list :', words[2:])
|
|
else:
|
|
database = []
|
|
try:
|
|
for i in range(2, len(words), 2):
|
|
x = checkarg(words[i], words[i+1])
|
|
database.append(x)
|
|
print
|
|
print '/*',
|
|
for w in words: print w,
|
|
print '*/'
|
|
generate(words[0], words[1], database)
|
|
except arg_error, msg:
|
|
err('Line', lno, ':', msg)
|
|
|
|
|
|
print
|
|
print 'static struct PyMethodDef gl_methods[] = {'
|
|
for func in functions:
|
|
print '\t{"' + func + '", gl_' + func + '},'
|
|
print '\t{NULL, NULL} /* Sentinel */'
|
|
print '};'
|
|
print
|
|
print 'void'
|
|
print 'initgl()'
|
|
print '{'
|
|
print '\t(void) Py_InitModule("gl", gl_methods);'
|
|
print '}'
|