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, Build
   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 version_key = lambda x: map(int, x.split("."))
  14
  15 def normalise_signature(sig):
  16     '''normalise a signature from gdb'''
  17     sig = sig.strip()
  18     sig = re.sub('^\$[0-9]+\s=\s\{*', '', sig)
  19     sig = re.sub('\}(\s0x[0-9a-f]+\s<\w+>)?$', '', sig)
  20     sig = re.sub('0x[0-9a-f]+', '0xXXXX', sig)
  21
  22     for t in abi_type_maps:
  23         # we need to cope with non-word characters in mapped types
  24         m = t
  25         m = m.replace('*', '\*')
  26         if m[-1].isalnum() or m[-1] == '_':
  27             m += '\\b'
  28         if m[0].isalnum() or m[0] == '_':
  29             m = '\\b' + m
  30         sig = re.sub(m, abi_type_maps[t], sig)
  31     return sig
  32
  33 def normalise_varargs(sig):
  34     '''cope with older versions of gdb'''
  35     sig = re.sub(',\s\.\.\.', '', sig)
  36     return sig
  37
  38 def parse_sigs(sigs, abi_match):
  39     '''parse ABI signatures file'''
  40     abi_match = samba_utils.TO_LIST(abi_match)
  41     ret = {}
  42     a = sigs.split('\n')
  43     for s in a:
  44         if s.find(':') == -1:
  45             continue
  46         sa = s.split(':')
  47         if abi_match:
  48             matched = False
  49             for p in abi_match:
  50                 if p[0] == '!' and fnmatch.fnmatch(sa[0], p[1:]):
  51                     break
  52                 elif fnmatch.fnmatch(sa[0], p):
  53                     matched = True
  54                     break
  55             if not matched:
  56                 continue
  57         ret[sa[0]] = normalise_signature(sa[1])
  58     return ret
  59
  60 def save_sigs(sig_file, parsed_sigs):
  61     '''save ABI signatures to a file'''
  62     sigs = ''
  63     for s in sorted(parsed_sigs.keys()):
  64         sigs += '%s: %s\n' % (s, parsed_sigs[s])
  65     return samba_utils.save_file(sig_file, sigs, create_dir=True)
  66
  67
  68 def abi_check_task(self):
  69     '''check if the ABI has changed'''
  70     abi_gen = self.ABI_GEN
  71
  72     libpath = self.inputs[0].abspath(self.env)
  73     libname = os.path.basename(libpath)
  74
  75     sigs = Utils.cmd_output([abi_gen, libpath])
  76     parsed_sigs = parse_sigs(sigs, self.ABI_MATCH)
  77
  78     sig_file = self.ABI_FILE
  79
  80     old_sigs = samba_utils.load_file(sig_file)
  81     if old_sigs is None or Options.options.ABI_UPDATE:
  82         if not save_sigs(sig_file, parsed_sigs):
  83             raise Utils.WafError('Failed to save ABI file "%s"' % sig_file)
  84         Logs.warn('Generated ABI signatures %s' % sig_file)
  85         return
  86
  87     parsed_old_sigs = parse_sigs(old_sigs, self.ABI_MATCH)
  88
  89     # check all old sigs
  90     got_error = False
  91     for s in parsed_old_sigs:
  92         if not s in parsed_sigs:
  93             Logs.error('%s: symbol %s has been removed - please update major version\n\tsignature: %s' % (
  94                 libname, s, parsed_old_sigs[s]))
  95             got_error = True
  96         elif normalise_varargs(parsed_old_sigs[s]) != normalise_varargs(parsed_sigs[s]):
  97             Logs.error('%s: symbol %s has changed - please update major version\n\told_signature: %s\n\tnew_signature: %s' % (
  98                 libname, s, parsed_old_sigs[s], parsed_sigs[s]))
  99             got_error = True
 100
 101     for s in parsed_sigs:
 102         if not s in parsed_old_sigs:
 103             Logs.error('%s: symbol %s has been added - please mark it _PRIVATE_ or update minor version\n\tsignature: %s' % (
 104                 libname, s, parsed_sigs[s]))
 105             got_error = True
 106
 107     if got_error:
 108         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)
 109
 110
 111 t = Task.task_type_from_func('abi_check', abi_check_task, color='BLUE', ext_in='.bin')
 112 t.quiet = True
 113 # allow "waf --abi-check" to force re-checking the ABI
 114 if '--abi-check' in sys.argv:
 115     Task.always_run(t)
 116
 117 @after('apply_link')
 118 @feature('abi_check')
 119 def abi_check(self):
 120     '''check that ABI matches saved signatures'''
 121     env = self.bld.env
 122     if not env.ABI_CHECK or self.abi_directory is None:
 123         return
 124
 125     # if the platform doesn't support -fvisibility=hidden then the ABI
 126     # checks become fairly meaningless
 127     if not env.HAVE_VISIBILITY_ATTR:
 128         return
 129
 130     topsrc = self.bld.srcnode.abspath()
 131     abi_gen = os.path.join(topsrc, 'buildtools/scripts/abi_gen.sh')
 132
 133     abi_file = "%s/%s-%s.sigs" % (self.abi_directory, self.name, self.vnum)
 134
 135     tsk = self.create_task('abi_check', self.link_task.outputs[0])
 136     tsk.ABI_FILE = abi_file
 137     tsk.ABI_MATCH = self.abi_match
 138     tsk.ABI_GEN = abi_gen
 139
 140
 141 def abi_process_file(fname, version, symmap):
 142     '''process one ABI file, adding new symbols to the symmap'''
 143     f = open(fname, mode='r')
 144     for line in f:
 145         symname = line.split(":")[0]
 146         if not symname in symmap:
 147             symmap[symname] = version
 148     f.close()
 149
 150 def abi_write_vscript(vscript, libname, current_version, versions, symmap, abi_match):
 151     '''write a vscript file for a library in --version-script format
 152
 153     :param vscript: Path to the vscript file
 154     :param libname: Name of the library, uppercased
 155     :param current_version: Current version
 156     :param versions: Versions to consider
 157     :param symmap: Dictionary mapping symbols -> version
 158     :param abi_match: List of symbols considered to be public in the current version
 159     '''
 160
 161     invmap = {}
 162     for s in symmap:
 163         invmap.setdefault(symmap[s], []).append(s)
 164
 165     f = open(vscript, mode='w')
 166     last_key = ""
 167     versions = sorted(versions, key=version_key)
 168     for k in versions:
 169         symver = "%s_%s" % (libname, k)
 170         if symver == current_version:
 171             break
 172         f.write("%s {\n" % symver)
 173         if k in invmap:
 174             f.write("\tglobal: \n")
 175             for s in invmap.get(k, []):
 176                 f.write("\t\t%s;\n" % s);
 177         f.write("}%s;\n\n" % last_key)
 178         last_key = " %s" % symver
 179     f.write("%s {\n" % current_version)
 180     f.write("\tglobal:\n")
 181     for x in abi_match:
 182         f.write("\t\t%s;\n" % x)
 183     if abi_match != ["*"]:
 184         f.write("\tlocal: *;\n")
 185     f.write("};\n")
 186     f.close()
 187
 188
 189 def abi_build_vscript(task):
 190     '''generate a vscript file for our public libraries'''
 191
 192     tgt = task.outputs[0].bldpath(task.env)
 193
 194     symmap = {}
 195     versions = []
 196     for f in task.inputs:
 197         fname = f.abspath(task.env)
 198         basename = os.path.basename(fname)
 199         version = basename[len(task.env.LIBNAME)+1:-len(".sigs")]
 200         versions.append(version)
 201         abi_process_file(fname, version, symmap)
 202     abi_write_vscript(tgt, task.env.LIBNAME, task.env.VERSION, versions, symmap,
 203                       task.env.ABI_MATCH)
 204
 205
 206 def ABI_VSCRIPT(bld, libname, abi_directory, version, vscript, abi_match=None):
 207     '''generate a vscript file for our public libraries'''
 208     if abi_directory:
 209         source = bld.path.ant_glob('%s/%s-[0-9]*.sigs' % (abi_directory, libname))
 210         def abi_file_key(path):
 211             return version_key(path[:-len(".sigs")].rsplit("-")[-1])
 212         source = sorted(source.split(), key=abi_file_key)
 213     else:
 214         source = ''
 215
 216     libname = os.path.basename(libname)
 217     version = os.path.basename(version)
 218     libname = libname.replace("-", "_").replace("+","_").upper()
 219     version = version.replace("-", "_").replace("+","_").upper()
 220
 221     t = bld.SAMBA_GENERATOR(vscript,
 222                             rule=abi_build_vscript,
 223                             source=source,
 224                             group='vscripts',
 225                             target=vscript)
 226     if abi_match is None:
 227         abi_match = ["*"]
 228     else:
 229         abi_match = samba_utils.TO_LIST(abi_match)
 230     t.env.ABI_MATCH = abi_match
 231     t.env.VERSION = version
 232     t.env.LIBNAME = libname
 233     t.vars = ['LIBNAME', 'VERSION', 'ABI_MATCH']
 234 Build.BuildContext.ABI_VSCRIPT = ABI_VSCRIPT