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 # these type maps cope with platform specific names for common types
   7 # please add new type mappings into the list below
   8 abi_type_maps = {
   9     '_Bool' : 'bool',
  10     'struct __va_list_tag *' : 'va_list'
  11     }
  12
  13 def normalise_signature(sig):
  14     '''normalise a signature from gdb'''
  15     sig = sig.strip()
  16     sig = re.sub('^\$[0-9]+\s=\s\{*', '', sig)
  17     sig = re.sub('\}(\s0x[0-9a-f]+\s<\w+>)?$', '', sig)
  18     sig = re.sub('0x[0-9a-f]+', '0xXXXX', sig)
  19
  20     for t in abi_type_maps:
  21         # we need to cope with non-word characters in mapped types
  22         m = t
  23         m = m.replace('*', '\*')
  24         if m[-1].isalnum() or m[-1] == '_':
  25             m += '\\b'
  26         if m[0].isalnum() or m[0] == '_':
  27             m = '\\b' + m
  28         sig = re.sub(m, abi_type_maps[t], sig)
  29     return sig
  30
  31 def normalise_varargs(sig):
  32     '''cope with older versions of gdb'''
  33     sig = re.sub(',\s\.\.\.', '', sig)
  34     return sig
  35
  36 def parse_sigs(sigs, abi_match):
  37     '''parse ABI signatures file'''
  38     abi_match = samba_utils.TO_LIST(abi_match)
  39     ret = {}
  40     a = sigs.split('\n')
  41     for s in a:
  42         if s.find(':') == -1:
  43             continue
  44         sa = s.split(':')
  45         if abi_match:
  46             matched = False
  47             for p in abi_match:
  48                 if p[0] == '!' and fnmatch.fnmatch(sa[0], p[1:]):
  49                     break
  50                 elif fnmatch.fnmatch(sa[0], p):
  51                     matched = True
  52                     break
  53             if not matched:
  54                 continue
  55         ret[sa[0]] = normalise_signature(sa[1])
  56     return ret
  57
  58 def save_sigs(sig_file, parsed_sigs):
  59     '''save ABI signatures to a file'''
  60     sigs = ''
  61     for s in sorted(parsed_sigs.keys()):
  62         sigs += '%s: %s\n' % (s, parsed_sigs[s])
  63     return samba_utils.save_file(sig_file, sigs, create_dir=True)
  64
  65
  66 def abi_check_task(self):
  67     '''check if the ABI has changed'''
  68     abi_gen = self.ABI_GEN
  69
  70     libpath = self.inputs[0].abspath(self.env)
  71     libname = os.path.basename(libpath)
  72
  73     sigs = Utils.cmd_output([abi_gen, libpath])
  74     parsed_sigs = parse_sigs(sigs, self.ABI_MATCH)
  75
  76     sig_file = self.ABI_FILE
  77
  78     old_sigs = samba_utils.load_file(sig_file)
  79     if old_sigs is None or Options.options.ABI_UPDATE:
  80         if not save_sigs(sig_file, parsed_sigs):
  81             raise Utils.WafError('Failed to save ABI file "%s"' % sig_file)
  82         Logs.warn('Generated ABI signatures %s' % sig_file)
  83         return
  84
  85     parsed_old_sigs = parse_sigs(old_sigs, self.ABI_MATCH)
  86
  87     # check all old sigs
  88     got_error = False
  89     for s in parsed_old_sigs:
  90         if not s in parsed_sigs:
  91             Logs.error('%s: symbol %s has been removed - please update major version\n\tsignature: %s' % (
  92                 libname, s, parsed_old_sigs[s]))
  93             got_error = True
  94         elif normalise_varargs(parsed_old_sigs[s]) != normalise_varargs(parsed_sigs[s]):
  95             Logs.error('%s: symbol %s has changed - please update major version\n\told_signature: %s\n\tnew_signature: %s' % (
  96                 libname, s, parsed_old_sigs[s], parsed_sigs[s]))
  97             got_error = True
  98
  99     for s in parsed_sigs:
 100         if not s in parsed_old_sigs:
 101             Logs.error('%s: symbol %s has been added - please mark it _PRIVATE_ or update minor version\n\tsignature: %s' % (
 102                 libname, s, parsed_sigs[s]))
 103             got_error = True
 104
 105     if got_error:
 106         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)
 107
 108
 109 t = Task.task_type_from_func('abi_check', abi_check_task, color='BLUE', ext_in='.bin')
 110 t.quiet = True
 111 # allow "waf --abi-check" to force re-checking the ABI
 112 if '--abi-check' in sys.argv:
 113     Task.always_run(t)
 114
 115 @after('apply_link')
 116 @feature('abi_check')
 117 def abi_check(self):
 118     '''check that ABI matches saved signatures'''
 119     env = self.bld.env
 120     if not env.ABI_CHECK or self.abi_file is None:
 121         return
 122
 123     # if the platform doesn't support -fvisibility=hidden then the ABI
 124     # checks become fairly meaningless
 125     if not env.HAVE_VISIBILITY_ATTR:
 126         return
 127
 128     topsrc = self.bld.srcnode.abspath()
 129     abi_gen = os.path.join(topsrc, 'buildtools/scripts/abi_gen.sh')
 130
 131     tsk = self.create_task('abi_check', self.link_task.outputs[0])
 132     tsk.ABI_FILE = self.abi_file
 133     tsk.ABI_MATCH = self.abi_match
 134     tsk.ABI_GEN = abi_gen