Tools/freeze/checkextensions.py

   1 # Check for a module in a set of extension directories.
   2 # An extension directory should contain a Setup file
   3 # and one or more .o files or a lib.a file.
   4
   5 import os
   6 import parsesetup
   7
   8 def checkextensions(unknown, extensions):
   9         files = []
  10         modules = []
  11         edict = {}
  12         for e in extensions:
  13                 setup = os.path.join(e, 'Setup')
  14                 liba = os.path.join(e, 'lib.a')
  15                 if not os.path.isfile(liba):
  16                         liba = None
  17                 edict[e] = parsesetup.getsetupinfo(setup), liba
  18         for mod in unknown:
  19                 for e in extensions:
  20                         (mods, vars), liba = edict[e]
  21                         if not mods.has_key(mod):
  22                                 continue
  23                         modules.append(mod)
  24                         if liba:
  25                                 # If we find a lib.a, use it, ignore the
  26                                 # .o files, and use *all* libraries for
  27                                 # *all* modules in the Setup file
  28                                 if liba in files:
  29                                         break
  30                                 files.append(liba)
  31                                 for m in mods.keys():
  32                                         files = files + select(e, mods, vars,
  33                                                                m, 1)
  34                                 break
  35                         files = files + select(e, mods, vars, mod, 0)
  36                         break
  37         return files, modules
  38
  39 def select(e, mods, vars, mod, skipofiles):
  40         files = []
  41         for w in mods[mod]:
  42                 w = treatword(w)
  43                 if not w:
  44                         continue
  45                 w = expandvars(w, vars)
  46                 for w in w.split():
  47                         if skipofiles and w[-2:] == '.o':
  48                                 continue
  49                         # Assume $var expands to absolute pathname
  50                         if w[0] not in ('-', '$') and w[-2:] in ('.o', '.a'):
  51                                 w = os.path.join(e, w)
  52                         if w[:2] in ('-L', '-R') and w[2:3] != '$':
  53                                 w = w[:2] + os.path.join(e, w[2:])
  54                         files.append(w)
  55         return files
  56
  57 cc_flags = ['-I', '-D', '-U']
  58 cc_exts = ['.c', '.C', '.cc', '.c++']
  59
  60 def treatword(w):
  61         if w[:2] in cc_flags:
  62                 return None
  63         if w[:1] == '-':
  64                 return w # Assume loader flag
  65         head, tail = os.path.split(w)
  66         base, ext = os.path.splitext(tail)
  67         if ext in cc_exts:
  68                 tail = base + '.o'
  69                 w = os.path.join(head, tail)
  70         return w
  71
  72 def expandvars(str, vars):
  73         i = 0
  74         while i < len(str):
  75                 i = k = str.find('$', i)
  76                 if i < 0:
  77                         break
  78                 i = i+1
  79                 var = str[i:i+1]
  80                 i = i+1
  81                 if var == '(':
  82                         j = str.find(')', i)
  83                         if j < 0:
  84                                 break
  85                         var = str[i:j]
  86                         i = j+1
  87                 if vars.has_key(var):
  88                         str = str[:k] + vars[var] + str[i:]
  89                         i = k
  90         return str