| 1 | ########################################################################
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| 2 | # Copyright (c) 2000, BeOpen.com.
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| 3 | # Copyright (c) 1995-2000, Corporation for National Research Initiatives.
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| 4 | # Copyright (c) 1990-1995, Stichting Mathematisch Centrum.
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| 5 | # All rights reserved.
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| 6 | #
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| 7 | # See the file "Misc/COPYRIGHT" for information on usage and
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| 8 | # redistribution of this file, and for a DISCLAIMER OF ALL WARRANTIES.
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| 9 | ########################################################################
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| 10 |
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| 11 | # Python script to parse cstubs file for gl and generate C stubs.
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| 12 | # usage: python cgen.py <cstubs >glmodule.c
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| 13 | #
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| 14 | # NOTE: You must first make a python binary without the "GL" option
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| 15 | # before you can run this, when building Python for the first time.
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| 16 | # See comments in the Makefile.
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| 17 | #
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| 18 | # XXX BUG return arrays generate wrong code
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| 19 | # XXX need to change error returns into gotos to free mallocked arrays
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| 20 |
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| 21 |
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| 22 | import string
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| 23 | import sys
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| 24 |
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| 25 |
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| 26 | # Function to print to stderr
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| 27 | #
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| 28 | def err(*args):
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| 29 | savestdout = sys.stdout
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| 30 | try:
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| 31 | sys.stdout = sys.stderr
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| 32 | for i in args:
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| 33 | print i,
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| 34 | print
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| 35 | finally:
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| 36 | sys.stdout = savestdout
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| 37 |
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| 38 |
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| 39 | # The set of digits that form a number
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| 40 | #
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| 41 | digits = '0123456789'
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| 42 |
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| 43 |
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| 44 | # Function to extract a string of digits from the front of the string.
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| 45 | # Returns the leading string of digits and the remaining string.
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| 46 | # If no number is found, returns '' and the original string.
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| 47 | #
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| 48 | def getnum(s):
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| 49 | n = ''
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| 50 | while s and s[0] in digits:
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| 51 | n = n + s[0]
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| 52 | s = s[1:]
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| 53 | return n, s
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| 54 |
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| 55 |
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| 56 | # Function to check if a string is a number
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| 57 | #
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| 58 | def isnum(s):
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| 59 | if not s: return False
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| 60 | for c in s:
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| 61 | if not c in digits: return False
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| 62 | return True
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| 63 |
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| 64 |
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| 65 | # Allowed function return types
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| 66 | #
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| 67 | return_types = ['void', 'short', 'long']
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| 68 |
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| 69 |
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| 70 | # Allowed function argument types
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| 71 | #
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| 72 | arg_types = ['char', 'string', 'short', 'u_short', 'float', 'long', 'double']
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| 73 |
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| 74 |
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| 75 | # Need to classify arguments as follows
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| 76 | # simple input variable
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| 77 | # simple output variable
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| 78 | # input array
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| 79 | # output array
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| 80 | # input giving size of some array
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| 81 | #
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| 82 | # Array dimensions can be specified as follows
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| 83 | # constant
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| 84 | # argN
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| 85 | # constant * argN
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| 86 | # retval
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| 87 | # constant * retval
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| 88 | #
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| 89 | # The dimensions given as constants * something are really
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| 90 | # arrays of points where points are 2- 3- or 4-tuples
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| 91 | #
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| 92 | # We have to consider three lists:
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| 93 | # python input arguments
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| 94 | # C stub arguments (in & out)
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| 95 | # python output arguments (really return values)
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| 96 | #
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| 97 | # There is a mapping from python input arguments to the input arguments
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| 98 | # of the C stub, and a further mapping from C stub arguments to the
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| 99 | # python return values
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| 100 |
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| 101 |
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| 102 | # Exception raised by checkarg() and generate()
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| 103 | #
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| 104 | arg_error = 'bad arg'
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| 105 |
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| 106 |
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| 107 | # Function to check one argument.
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| 108 | # Arguments: the type and the arg "name" (really mode plus subscript).
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| 109 | # Raises arg_error if something's wrong.
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| 110 | # Return type, mode, factor, rest of subscript; factor and rest may be empty.
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| 111 | #
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| 112 | def checkarg(type, arg):
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| 113 | #
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| 114 | # Turn "char *x" into "string x".
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| 115 | #
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| 116 | if type == 'char' and arg[0] == '*':
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| 117 | type = 'string'
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| 118 | arg = arg[1:]
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| 119 | #
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| 120 | # Check that the type is supported.
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| 121 | #
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| 122 | if type not in arg_types:
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| 123 | raise arg_error, ('bad type', type)
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| 124 | if type[:2] == 'u_':
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| 125 | type = 'unsigned ' + type[2:]
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| 126 | #
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| 127 | # Split it in the mode (first character) and the rest.
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| 128 | #
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| 129 | mode, rest = arg[:1], arg[1:]
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| 130 | #
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| 131 | # The mode must be 's' for send (= input) or 'r' for return argument.
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| 132 | #
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| 133 | if mode not in ('r', 's'):
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| 134 | raise arg_error, ('bad arg mode', mode)
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| 135 | #
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| 136 | # Is it a simple argument: if so, we are done.
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| 137 | #
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| 138 | if not rest:
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| 139 | return type, mode, '', ''
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| 140 | #
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| 141 | # Not a simple argument; must be an array.
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| 142 | # The 'rest' must be a subscript enclosed in [ and ].
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| 143 | # The subscript must be one of the following forms,
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| 144 | # otherwise we don't handle it (where N is a number):
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| 145 | # N
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| 146 | # argN
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| 147 | # retval
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| 148 | # N*argN
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| 149 | # N*retval
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| 150 | #
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| 151 | if rest[:1] <> '[' or rest[-1:] <> ']':
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| 152 | raise arg_error, ('subscript expected', rest)
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| 153 | sub = rest[1:-1]
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| 154 | #
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| 155 | # Is there a leading number?
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| 156 | #
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| 157 | num, sub = getnum(sub)
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| 158 | if num:
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| 159 | # There is a leading number
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| 160 | if not sub:
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| 161 | # The subscript is just a number
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| 162 | return type, mode, num, ''
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| 163 | if sub[:1] == '*':
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| 164 | # There is a factor prefix
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| 165 | sub = sub[1:]
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| 166 | else:
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| 167 | raise arg_error, ('\'*\' expected', sub)
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| 168 | if sub == 'retval':
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| 169 | # size is retval -- must be a reply argument
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| 170 | if mode <> 'r':
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| 171 | raise arg_error, ('non-r mode with [retval]', mode)
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| 172 | elif not isnum(sub) and (sub[:3] <> 'arg' or not isnum(sub[3:])):
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| 173 | raise arg_error, ('bad subscript', sub)
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| 174 | #
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| 175 | return type, mode, num, sub
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| 176 |
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| 177 |
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| 178 | # List of functions for which we have generated stubs
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| 179 | #
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| 180 | functions = []
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| 181 |
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| 182 |
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| 183 | # Generate the stub for the given function, using the database of argument
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| 184 | # information build by successive calls to checkarg()
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| 185 | #
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| 186 | def generate(type, func, database):
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| 187 | #
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| 188 | # Check that we can handle this case:
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| 189 | # no variable size reply arrays yet
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| 190 | #
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| 191 | n_in_args = 0
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| 192 | n_out_args = 0
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| 193 | #
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| 194 | for a_type, a_mode, a_factor, a_sub in database:
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| 195 | if a_mode == 's':
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| 196 | n_in_args = n_in_args + 1
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| 197 | elif a_mode == 'r':
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| 198 | n_out_args = n_out_args + 1
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| 199 | else:
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| 200 | # Can't happen
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| 201 | raise arg_error, ('bad a_mode', a_mode)
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| 202 | if (a_mode == 'r' and a_sub) or a_sub == 'retval':
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| 203 | err('Function', func, 'too complicated:',
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| 204 | a_type, a_mode, a_factor, a_sub)
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| 205 | print '/* XXX Too complicated to generate code for */'
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| 206 | return
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| 207 | #
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| 208 | functions.append(func)
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| 209 | #
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| 210 | # Stub header
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| 211 | #
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| 212 | print
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| 213 | print 'static PyObject *'
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| 214 | print 'gl_' + func + '(self, args)'
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| 215 | print '\tPyObject *self;'
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| 216 | print '\tPyObject *args;'
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| 217 | print '{'
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| 218 | #
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| 219 | # Declare return value if any
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| 220 | #
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| 221 | if type <> 'void':
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| 222 | print '\t' + type, 'retval;'
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| 223 | #
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| 224 | # Declare arguments
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| 225 | #
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| 226 | for i in range(len(database)):
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| 227 | a_type, a_mode, a_factor, a_sub = database[i]
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| 228 | print '\t' + a_type,
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| 229 | brac = ket = ''
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| 230 | if a_sub and not isnum(a_sub):
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| 231 | if a_factor:
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| 232 | brac = '('
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| 233 | ket = ')'
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| 234 | print brac + '*',
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| 235 | print 'arg' + repr(i+1) + ket,
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| 236 | if a_sub and isnum(a_sub):
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| 237 | print '[', a_sub, ']',
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| 238 | if a_factor:
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| 239 | print '[', a_factor, ']',
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| 240 | print ';'
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| 241 | #
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| 242 | # Find input arguments derived from array sizes
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| 243 | #
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| 244 | for i in range(len(database)):
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| 245 | a_type, a_mode, a_factor, a_sub = database[i]
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| 246 | if a_mode == 's' and a_sub[:3] == 'arg' and isnum(a_sub[3:]):
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| 247 | # Sending a variable-length array
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| 248 | n = eval(a_sub[3:])
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| 249 | if 1 <= n <= len(database):
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| 250 | b_type, b_mode, b_factor, b_sub = database[n-1]
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| 251 | if b_mode == 's':
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| 252 | database[n-1] = b_type, 'i', a_factor, repr(i)
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| 253 | n_in_args = n_in_args - 1
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| 254 | #
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| 255 | # Assign argument positions in the Python argument list
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| 256 | #
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| 257 | in_pos = []
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| 258 | i_in = 0
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| 259 | for i in range(len(database)):
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| 260 | a_type, a_mode, a_factor, a_sub = database[i]
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| 261 | if a_mode == 's':
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| 262 | in_pos.append(i_in)
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| 263 | i_in = i_in + 1
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| 264 | else:
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| 265 | in_pos.append(-1)
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| 266 | #
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| 267 | # Get input arguments
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| 268 | #
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| 269 | for i in range(len(database)):
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| 270 | a_type, a_mode, a_factor, a_sub = database[i]
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| 271 | if a_type[:9] == 'unsigned ':
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| 272 | xtype = a_type[9:]
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| 273 | else:
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| 274 | xtype = a_type
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| 275 | if a_mode == 'i':
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| 276 | #
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| 277 | # Implicit argument;
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| 278 | # a_factor is divisor if present,
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| 279 | # a_sub indicates which arg (`database index`)
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| 280 | #
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| 281 | j = eval(a_sub)
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| 282 | print '\tif',
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| 283 | print '(!geti' + xtype + 'arraysize(args,',
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| 284 | print repr(n_in_args) + ',',
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| 285 | print repr(in_pos[j]) + ',',
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| 286 | if xtype <> a_type:
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| 287 | print '('+xtype+' *)',
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| 288 | print '&arg' + repr(i+1) + '))'
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| 289 | print '\t\treturn NULL;'
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| 290 | if a_factor:
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| 291 | print '\targ' + repr(i+1),
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| 292 | print '= arg' + repr(i+1),
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| 293 | print '/', a_factor + ';'
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| 294 | elif a_mode == 's':
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| 295 | if a_sub and not isnum(a_sub):
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| 296 | # Allocate memory for varsize array
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| 297 | print '\tif ((arg' + repr(i+1), '=',
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| 298 | if a_factor:
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| 299 | print '('+a_type+'(*)['+a_factor+'])',
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| 300 | print 'PyMem_NEW(' + a_type, ',',
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| 301 | if a_factor:
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| 302 | print a_factor, '*',
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| 303 | print a_sub, ')) == NULL)'
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| 304 | print '\t\treturn PyErr_NoMemory();'
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| 305 | print '\tif',
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| 306 | if a_factor or a_sub: # Get a fixed-size array array
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| 307 | print '(!geti' + xtype + 'array(args,',
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| 308 | print repr(n_in_args) + ',',
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| 309 | print repr(in_pos[i]) + ',',
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| 310 | if a_factor: print a_factor,
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| 311 | if a_factor and a_sub: print '*',
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| 312 | if a_sub: print a_sub,
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| 313 | print ',',
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| 314 | if (a_sub and a_factor) or xtype <> a_type:
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| 315 | print '('+xtype+' *)',
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| 316 | print 'arg' + repr(i+1) + '))'
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| 317 | else: # Get a simple variable
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| 318 | print '(!geti' + xtype + 'arg(args,',
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| 319 | print repr(n_in_args) + ',',
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| 320 | print repr(in_pos[i]) + ',',
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| 321 | if xtype <> a_type:
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| 322 | print '('+xtype+' *)',
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| 323 | print '&arg' + repr(i+1) + '))'
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| 324 | print '\t\treturn NULL;'
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| 325 | #
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| 326 | # Begin of function call
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| 327 | #
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| 328 | if type <> 'void':
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| 329 | print '\tretval =', func + '(',
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| 330 | else:
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| 331 | print '\t' + func + '(',
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| 332 | #
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| 333 | # Argument list
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| 334 | #
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| 335 | for i in range(len(database)):
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| 336 | if i > 0: print ',',
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| 337 | a_type, a_mode, a_factor, a_sub = database[i]
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| 338 | if a_mode == 'r' and not a_factor:
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| 339 | print '&',
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| 340 | print 'arg' + repr(i+1),
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| 341 | #
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| 342 | # End of function call
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| 343 | #
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| 344 | print ');'
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| 345 | #
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| 346 | # Free varsize arrays
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| 347 | #
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| 348 | for i in range(len(database)):
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| 349 | a_type, a_mode, a_factor, a_sub = database[i]
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| 350 | if a_mode == 's' and a_sub and not isnum(a_sub):
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| 351 | print '\tPyMem_DEL(arg' + repr(i+1) + ');'
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| 352 | #
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| 353 | # Return
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| 354 | #
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| 355 | if n_out_args:
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| 356 | #
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| 357 | # Multiple return values -- construct a tuple
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| 358 | #
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| 359 | if type <> 'void':
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| 360 | n_out_args = n_out_args + 1
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| 361 | if n_out_args == 1:
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| 362 | for i in range(len(database)):
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| 363 | a_type, a_mode, a_factor, a_sub = database[i]
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| 364 | if a_mode == 'r':
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| 365 | break
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| 366 | else:
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| 367 | raise arg_error, 'expected r arg not found'
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| 368 | print '\treturn',
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| 369 | print mkobject(a_type, 'arg' + repr(i+1)) + ';'
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| 370 | else:
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| 371 | print '\t{ PyObject *v = PyTuple_New(',
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| 372 | print n_out_args, ');'
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| 373 | print '\t if (v == NULL) return NULL;'
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| 374 | i_out = 0
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| 375 | if type <> 'void':
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| 376 | print '\t PyTuple_SetItem(v,',
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| 377 | print repr(i_out) + ',',
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| 378 | print mkobject(type, 'retval') + ');'
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| 379 | i_out = i_out + 1
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| 380 | for i in range(len(database)):
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| 381 | a_type, a_mode, a_factor, a_sub = database[i]
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| 382 | if a_mode == 'r':
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| 383 | print '\t PyTuple_SetItem(v,',
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| 384 | print repr(i_out) + ',',
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| 385 | s = mkobject(a_type, 'arg' + repr(i+1))
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| 386 | print s + ');'
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| 387 | i_out = i_out + 1
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| 388 | print '\t return v;'
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| 389 | print '\t}'
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| 390 | else:
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| 391 | #
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| 392 | # Simple function return
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| 393 | # Return None or return value
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| 394 | #
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| 395 | if type == 'void':
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| 396 | print '\tPy_INCREF(Py_None);'
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| 397 | print '\treturn Py_None;'
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| 398 | else:
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| 399 | print '\treturn', mkobject(type, 'retval') + ';'
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| 400 | #
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| 401 | # Stub body closing brace
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| 402 | #
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| 403 | print '}'
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| 404 |
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| 405 |
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| 406 | # Subroutine to return a function call to mknew<type>object(<arg>)
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| 407 | #
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| 408 | def mkobject(type, arg):
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| 409 | if type[:9] == 'unsigned ':
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| 410 | type = type[9:]
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| 411 | return 'mknew' + type + 'object((' + type + ') ' + arg + ')'
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| 412 | return 'mknew' + type + 'object(' + arg + ')'
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| 413 |
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| 414 |
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| 415 | defined_archs = []
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| 416 |
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| 417 | # usage: cgen [ -Dmach ... ] [ file ]
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| 418 | for arg in sys.argv[1:]:
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| 419 | if arg[:2] == '-D':
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| 420 | defined_archs.append(arg[2:])
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| 421 | else:
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| 422 | # Open optional file argument
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| 423 | sys.stdin = open(arg, 'r')
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| 424 |
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| 425 |
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| 426 | # Input line number
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| 427 | lno = 0
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| 428 |
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| 429 |
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| 430 | # Input is divided in two parts, separated by a line containing '%%'.
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| 431 | # <part1> -- literally copied to stdout
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| 432 | # <part2> -- stub definitions
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| 433 |
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| 434 | # Variable indicating the current input part.
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| 435 | #
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| 436 | part = 1
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| 437 |
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| 438 | # Main loop over the input
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| 439 | #
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| 440 | while 1:
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| 441 | try:
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| 442 | line = raw_input()
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| 443 | except EOFError:
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| 444 | break
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| 445 | #
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| 446 | lno = lno+1
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| 447 | words = string.split(line)
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| 448 | #
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| 449 | if part == 1:
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| 450 | #
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| 451 | # In part 1, copy everything literally
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| 452 | # except look for a line of just '%%'
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| 453 | #
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| 454 | if words == ['%%']:
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| 455 | part = part + 1
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| 456 | else:
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| 457 | #
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| 458 | # Look for names of manually written
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| 459 | # stubs: a single percent followed by the name
|
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| 460 | # of the function in Python.
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| 461 | # The stub name is derived by prefixing 'gl_'.
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| 462 | #
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| 463 | if words and words[0][0] == '%':
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| 464 | func = words[0][1:]
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| 465 | if (not func) and words[1:]:
|
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| 466 | func = words[1]
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| 467 | if func:
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| 468 | functions.append(func)
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| 469 | else:
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| 470 | print line
|
|---|
| 471 | continue
|
|---|
| 472 | if not words:
|
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| 473 | continue # skip empty line
|
|---|
| 474 | elif words[0] == 'if':
|
|---|
| 475 | # if XXX rest
|
|---|
| 476 | # if !XXX rest
|
|---|
| 477 | if words[1][0] == '!':
|
|---|
| 478 | if words[1][1:] in defined_archs:
|
|---|
| 479 | continue
|
|---|
| 480 | elif words[1] not in defined_archs:
|
|---|
| 481 | continue
|
|---|
| 482 | words = words[2:]
|
|---|
| 483 | if words[0] == '#include':
|
|---|
| 484 | print line
|
|---|
| 485 | elif words[0][:1] == '#':
|
|---|
| 486 | pass # ignore comment
|
|---|
| 487 | elif words[0] not in return_types:
|
|---|
| 488 | err('Line', lno, ': bad return type :', words[0])
|
|---|
| 489 | elif len(words) < 2:
|
|---|
| 490 | err('Line', lno, ': no funcname :', line)
|
|---|
| 491 | else:
|
|---|
| 492 | if len(words) % 2 <> 0:
|
|---|
| 493 | err('Line', lno, ': odd argument list :', words[2:])
|
|---|
| 494 | else:
|
|---|
| 495 | database = []
|
|---|
| 496 | try:
|
|---|
| 497 | for i in range(2, len(words), 2):
|
|---|
| 498 | x = checkarg(words[i], words[i+1])
|
|---|
| 499 | database.append(x)
|
|---|
| 500 | print
|
|---|
| 501 | print '/*',
|
|---|
| 502 | for w in words: print w,
|
|---|
| 503 | print '*/'
|
|---|
| 504 | generate(words[0], words[1], database)
|
|---|
| 505 | except arg_error, msg:
|
|---|
| 506 | err('Line', lno, ':', msg)
|
|---|
| 507 |
|
|---|
| 508 |
|
|---|
| 509 | print
|
|---|
| 510 | print 'static struct PyMethodDef gl_methods[] = {'
|
|---|
| 511 | for func in functions:
|
|---|
| 512 | print '\t{"' + func + '", gl_' + func + '},'
|
|---|
| 513 | print '\t{NULL, NULL} /* Sentinel */'
|
|---|
| 514 | print '};'
|
|---|
| 515 | print
|
|---|
| 516 | print 'void'
|
|---|
| 517 | print 'initgl()'
|
|---|
| 518 | print '{'
|
|---|
| 519 | print '\t(void) Py_InitModule("gl", gl_methods);'
|
|---|
| 520 | print '}'
|
|---|
