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