buildtools/wafsamba/samba_abi.py

   1 # functions for handling ABI checking of libraries
   2
   3 import Options, Utils, os, Logs, samba_utils, sys, Task, fnmatch, re
   4 from TaskGen import feature, before, after
   5
   6 def normalise_signature(sig):
   7     '''normalise a signature from gdb'''
   8     sig = sig.strip()
   9     sig = re.sub('^\$[0-9]+\s=\s\{*', '', sig)
  10     sig = re.sub('\}(\s0x[0-9a-f]+\s<\w+>)?$', '', sig)
  11     sig = re.sub('0x[0-9a-f]+', '0xXXXX', sig)
  12     return sig
  13
  14 def normalise_varargs(sig):
  15     '''cope with older versions of gdb'''
  16     sig = re.sub(',\s\.\.\.', '', sig)
  17     return sig
  18
  19 def parse_sigs(sigs, abi_match):
  20     '''parse ABI signatures file'''
  21     abi_match = samba_utils.TO_LIST(abi_match)
  22     ret = {}
  23     a = sigs.split('\n')
  24     for s in a:
  25         if s.find(':') == -1:
  26             continue
  27         sa = s.split(':')
  28         if abi_match:
  29             matched = False
  30             for p in abi_match:
  31                 if fnmatch.fnmatch(sa[0], p):
  32                     matched = True
  33                     break
  34             if not matched:
  35                 continue
  36         ret[sa[0]] = normalise_signature(sa[1])
  37     return ret
  38
  39 def save_sigs(sig_file, parsed_sigs):
  40     '''save ABI signatures to a file'''
  41     sigs = ''
  42     for s in sorted(parsed_sigs.keys()):
  43         sigs += '%s: %s\n' % (s, parsed_sigs[s])
  44     return samba_utils.save_file(sig_file, sigs, create_dir=True)
  45
  46
  47 def abi_check_task(self):
  48     '''check if the ABI has changed'''
  49     abi_gen = self.ABI_GEN
  50
  51     libpath = self.inputs[0].abspath(self.env)
  52     libname = os.path.basename(libpath)
  53
  54     sigs = Utils.cmd_output([abi_gen, libpath])
  55     parsed_sigs = parse_sigs(sigs, self.ABI_MATCH)
  56
  57     sig_file = self.ABI_FILE
  58
  59     old_sigs = samba_utils.load_file(sig_file)
  60     if old_sigs is None or Options.options.ABI_UPDATE:
  61         if not save_sigs(sig_file, parsed_sigs):
  62             raise Utils.WafError('Failed to save ABI file "%s"' % sig_file)
  63         Logs.warn('Generated ABI signatures %s' % sig_file)
  64         return
  65
  66     parsed_old_sigs = parse_sigs(old_sigs, self.ABI_MATCH)
  67
  68     # check all old sigs
  69     got_error = False
  70     for s in parsed_old_sigs:
  71         if not s in parsed_sigs:
  72             Logs.error('%s: symbol %s has been removed - please update major version\n\tsignature: %s' % (
  73                 libname, s, parsed_old_sigs[s]))
  74             got_error = True
  75         elif normalise_varargs(parsed_old_sigs[s]) != normalise_varargs(parsed_sigs[s]):
  76             Logs.error('%s: symbol %s has changed - please update major version\n\told_signature: %s\n\tnew_signature: %s' % (
  77                 libname, s, parsed_old_sigs[s], parsed_sigs[s]))
  78             got_error = True
  79
  80     for s in parsed_sigs:
  81         if not s in parsed_old_sigs:
  82             Logs.error('%s: symbol %s has been added - please mark it _PRIVATE_ or update minor version\n\tsignature: %s' % (
  83                 libname, s, parsed_sigs[s]))
  84             got_error = True
  85
  86     if got_error:
  87         raise Utils.WafError('ABI for %s has changed - please fix library version then build with --abi-update\nSee http://wiki.samba.org/index.php/Waf#ABI_Checking for more information' % libname)
  88
  89
  90 t = Task.task_type_from_func('abi_check', abi_check_task, color='BLUE', ext_in='.bin')
  91 t.quiet = True
  92
  93 @after('apply_link')
  94 @feature('abi_check')
  95 def abi_check(self):
  96     '''check that ABI matches saved signatures'''
  97     env = self.bld.env
  98     if not env.ABI_CHECK or self.abi_file is None:
  99         return
 100
 101     # if the platform doesn't support -fvisibility=hidden then the ABI
 102     # checks become fairly meaningless
 103     if not env.HAVE_VISIBILITY_ATTR:
 104         return
 105
 106     topsrc = self.bld.srcnode.abspath()
 107     abi_gen = os.path.join(topsrc, 'buildtools/scripts/abi_gen.sh')
 108
 109     tsk = self.create_task('abi_check', self.link_task.outputs[0])
 110     tsk.ABI_FILE = self.abi_file
 111     tsk.ABI_MATCH = self.abi_match
 112     tsk.ABI_GEN = abi_gen