| 1 | # a waf tool to extract symbols from object files or libraries
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| 2 | # using nm, producing a set of exposed defined/undefined symbols
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| 3 |
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| 4 | import Utils, Build, subprocess, Logs
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| 5 | from samba_wildcard import fake_build_environment
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| 6 | from samba_utils import *
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| 7 |
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| 8 | # these are the data structures used in symbols.py:
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| 9 | #
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| 10 | # bld.env.symbol_map : dictionary mapping public symbol names to list of
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| 11 | # subsystem names where that symbol exists
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| 12 | #
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| 13 | # t.in_library : list of libraries that t is in
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| 14 | #
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| 15 | # bld.env.public_symbols: set of public symbols for each subsystem
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| 16 | # bld.env.used_symbols : set of used symbols for each subsystem
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| 17 | #
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| 18 | # bld.env.syslib_symbols: dictionary mapping system library name to set of symbols
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| 19 | # for that library
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| 20 | #
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| 21 | # LOCAL_CACHE(bld, 'TARGET_TYPE') : dictionary mapping subsystem name to target type
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| 22 |
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| 23 | def symbols_extract(objfiles, dynamic=False):
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| 24 | '''extract symbols from objfile, returning a dictionary containing
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| 25 | the set of undefined and public symbols for each file'''
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| 26 |
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| 27 | ret = {}
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| 28 |
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| 29 | cmd = ["nm"]
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| 30 | if dynamic:
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| 31 | # needed for some .so files
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| 32 | cmd.append("-D")
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| 33 | cmd.extend(objfiles)
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| 34 |
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| 35 | nmpipe = subprocess.Popen(cmd, stdout=subprocess.PIPE).stdout
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| 36 | if len(objfiles) == 1:
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| 37 | filename = objfiles[0]
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| 38 | ret[filename] = { "PUBLIC": set(), "UNDEFINED" : set()}
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| 39 |
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| 40 | for line in nmpipe:
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| 41 | line = line.strip()
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| 42 | if line.endswith(':'):
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| 43 | filename = line[:-1]
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| 44 | ret[filename] = { "PUBLIC": set(), "UNDEFINED" : set() }
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| 45 | continue
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| 46 | cols = line.split(" ")
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| 47 | if cols == ['']:
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| 48 | continue
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| 49 | # see if the line starts with an address
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| 50 | if len(cols) == 3:
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| 51 | symbol_type = cols[1]
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| 52 | symbol = cols[2]
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| 53 | else:
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| 54 | symbol_type = cols[0]
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| 55 | symbol = cols[1]
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| 56 | if symbol_type in "BDGTRVWSi":
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| 57 | # its a public symbol
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| 58 | ret[filename]["PUBLIC"].add(symbol)
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| 59 | elif symbol_type in "U":
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| 60 | ret[filename]["UNDEFINED"].add(symbol)
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| 61 |
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| 62 | return ret
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| 63 |
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| 64 |
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| 65 | def real_name(name):
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| 66 | if name.find(".objlist") != -1:
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| 67 | name = name[:-8]
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| 68 | return name
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| 69 |
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| 70 |
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| 71 | def find_syslib_path(bld, libname, deps):
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| 72 | '''find the path to the syslib we will link against'''
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| 73 | # the strategy is to use the targets that depend on the library, and run ldd
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| 74 | # on it to find the real location of the library that is used
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| 75 |
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| 76 | linkpath = deps[0].link_task.outputs[0].abspath(bld.env)
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| 77 |
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| 78 | if libname == "python":
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| 79 | libname += bld.env.PYTHON_VERSION
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| 80 |
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| 81 | ret = None
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| 82 |
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| 83 | lddpipe = subprocess.Popen(['ldd', linkpath], stdout=subprocess.PIPE).stdout
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| 84 | for line in lddpipe:
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| 85 | line = line.strip()
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| 86 | cols = line.split(" ")
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| 87 | if len(cols) < 3 or cols[1] != "=>":
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| 88 | continue
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| 89 | if cols[0].startswith("lib%s." % libname.lower()):
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| 90 | ret = cols[2]
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| 91 | if cols[0].startswith("libc."):
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| 92 | # save this one too
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| 93 | bld.env.libc_path = cols[2]
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| 94 | return ret
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| 95 |
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| 96 |
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| 97 | def build_symbol_sets(bld, tgt_list):
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| 98 | '''build the public_symbols and undefined_symbols attributes for each target'''
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| 99 |
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| 100 | if bld.env.public_symbols:
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| 101 | return
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| 102 |
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| 103 | objlist = [] # list of object file
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| 104 | objmap = {} # map from object filename to target (subsystem) name
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| 105 |
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| 106 | for t in tgt_list:
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| 107 | t.public_symbols = set()
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| 108 | t.undefined_symbols = set()
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| 109 | t.used_symbols = set()
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| 110 | for tsk in getattr(t, 'compiled_tasks', []):
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| 111 | for output in tsk.outputs:
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| 112 | objpath = output.abspath(bld.env)
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| 113 | objlist.append(objpath)
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| 114 | objmap[objpath] = t
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| 115 |
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| 116 | symbols = symbols_extract(objlist)
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| 117 | for obj in objlist:
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| 118 | t = objmap[obj]
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| 119 | t.public_symbols = t.public_symbols.union(symbols[obj]["PUBLIC"])
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| 120 | t.undefined_symbols = t.undefined_symbols.union(symbols[obj]["UNDEFINED"])
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| 121 | t.used_symbols = t.used_symbols.union(symbols[obj]["UNDEFINED"])
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| 122 |
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| 123 | t.undefined_symbols = t.undefined_symbols.difference(t.public_symbols)
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| 124 |
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| 125 | # and the reverse map of public symbols to subsystem name
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| 126 | bld.env.symbol_map = {}
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| 127 |
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| 128 | for t in tgt_list:
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| 129 | for s in t.public_symbols:
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| 130 | if not s in bld.env.symbol_map:
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| 131 | bld.env.symbol_map[s] = []
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| 132 | bld.env.symbol_map[s].append(real_name(t.sname))
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| 133 |
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| 134 | targets = LOCAL_CACHE(bld, 'TARGET_TYPE')
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| 135 |
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| 136 | bld.env.public_symbols = {}
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| 137 | for t in tgt_list:
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| 138 | name = real_name(t.sname)
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| 139 | if name in bld.env.public_symbols:
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| 140 | bld.env.public_symbols[name] = bld.env.public_symbols[name].union(t.public_symbols)
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| 141 | else:
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| 142 | bld.env.public_symbols[name] = t.public_symbols
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| 143 | if t.samba_type == 'LIBRARY':
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| 144 | for dep in t.add_objects:
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| 145 | t2 = bld.name_to_obj(dep, bld.env)
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| 146 | bld.ASSERT(t2 is not None, "Library '%s' has unknown dependency '%s'" % (name, dep))
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| 147 | bld.env.public_symbols[name] = bld.env.public_symbols[name].union(t2.public_symbols)
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| 148 |
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| 149 | bld.env.used_symbols = {}
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| 150 | for t in tgt_list:
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| 151 | name = real_name(t.sname)
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| 152 | if name in bld.env.used_symbols:
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| 153 | bld.env.used_symbols[name] = bld.env.used_symbols[name].union(t.used_symbols)
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| 154 | else:
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| 155 | bld.env.used_symbols[name] = t.used_symbols
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| 156 | if t.samba_type == 'LIBRARY':
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| 157 | for dep in t.add_objects:
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| 158 | t2 = bld.name_to_obj(dep, bld.env)
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| 159 | bld.ASSERT(t2 is not None, "Library '%s' has unknown dependency '%s'" % (name, dep))
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| 160 | bld.env.used_symbols[name] = bld.env.used_symbols[name].union(t2.used_symbols)
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| 161 |
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| 162 |
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| 163 | def build_syslib_sets(bld, tgt_list):
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| 164 | '''build the public_symbols for all syslibs'''
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| 165 |
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| 166 | if bld.env.syslib_symbols:
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| 167 | return
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| 168 |
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| 169 | # work out what syslibs we depend on, and what targets those are used in
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| 170 | syslibs = {}
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| 171 | objmap = {}
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| 172 | for t in tgt_list:
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| 173 | if getattr(t, 'uselib', []) and t.samba_type in [ 'LIBRARY', 'BINARY', 'PYTHON' ]:
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| 174 | for lib in t.uselib:
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| 175 | if lib in ['PYEMBED', 'PYEXT']:
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| 176 | lib = "python"
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| 177 | if not lib in syslibs:
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| 178 | syslibs[lib] = []
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| 179 | syslibs[lib].append(t)
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| 180 |
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| 181 | # work out the paths to each syslib
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| 182 | syslib_paths = []
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| 183 | for lib in syslibs:
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| 184 | path = find_syslib_path(bld, lib, syslibs[lib])
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| 185 | if path is None:
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| 186 | Logs.warn("Unable to find syslib path for %s" % lib)
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| 187 | if path is not None:
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| 188 | syslib_paths.append(path)
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| 189 | objmap[path] = lib.lower()
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| 190 |
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| 191 | # add in libc
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| 192 | syslib_paths.append(bld.env.libc_path)
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| 193 | objmap[bld.env.libc_path] = 'c'
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| 194 |
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| 195 | symbols = symbols_extract(syslib_paths, dynamic=True)
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| 196 |
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| 197 | # keep a map of syslib names to public symbols
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| 198 | bld.env.syslib_symbols = {}
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| 199 | for lib in symbols:
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| 200 | bld.env.syslib_symbols[lib] = symbols[lib]["PUBLIC"]
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| 201 |
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| 202 | # add to the map of symbols to dependencies
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| 203 | for lib in symbols:
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| 204 | for sym in symbols[lib]["PUBLIC"]:
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| 205 | if not sym in bld.env.symbol_map:
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| 206 | bld.env.symbol_map[sym] = []
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| 207 | bld.env.symbol_map[sym].append(objmap[lib])
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| 208 |
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| 209 | # keep the libc symbols as well, as these are useful for some of the
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| 210 | # sanity checks
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| 211 | bld.env.libc_symbols = symbols[bld.env.libc_path]["PUBLIC"]
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| 212 |
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| 213 | # add to the combined map of dependency name to public_symbols
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| 214 | for lib in bld.env.syslib_symbols:
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| 215 | bld.env.public_symbols[objmap[lib]] = bld.env.syslib_symbols[lib]
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| 216 |
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| 217 |
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| 218 | def build_autodeps(bld, t):
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| 219 | '''build the set of dependencies for a target'''
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| 220 | deps = set()
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| 221 | name = real_name(t.sname)
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| 222 |
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| 223 | targets = LOCAL_CACHE(bld, 'TARGET_TYPE')
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| 224 |
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| 225 | for sym in t.undefined_symbols:
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| 226 | if sym in t.public_symbols:
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| 227 | continue
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| 228 | if sym in bld.env.symbol_map:
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| 229 | depname = bld.env.symbol_map[sym]
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| 230 | if depname == [ name ]:
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| 231 | # self dependencies aren't interesting
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| 232 | continue
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| 233 | if t.in_library == depname:
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| 234 | # no need to depend on the library we are part of
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| 235 | continue
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| 236 | if depname[0] in ['c', 'python']:
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| 237 | # these don't go into autodeps
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| 238 | continue
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| 239 | if targets[depname[0]] in [ 'SYSLIB' ]:
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| 240 | deps.add(depname[0])
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| 241 | continue
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| 242 | t2 = bld.name_to_obj(depname[0], bld.env)
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| 243 | if len(t2.in_library) != 1:
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| 244 | deps.add(depname[0])
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| 245 | continue
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| 246 | if t2.in_library == t.in_library:
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| 247 | # if we're part of the same library, we don't need to autodep
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| 248 | continue
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| 249 | deps.add(t2.in_library[0])
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| 250 | t.autodeps = deps
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| 251 |
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| 252 |
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| 253 | def build_library_names(bld, tgt_list):
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| 254 | '''add a in_library attribute to all targets that are part of a library'''
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| 255 |
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| 256 | if bld.env.done_build_library_names:
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| 257 | return
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| 258 |
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| 259 | for t in tgt_list:
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| 260 | t.in_library = []
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| 261 |
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| 262 | for t in tgt_list:
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| 263 | if t.samba_type in [ 'LIBRARY' ]:
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| 264 | for obj in t.samba_deps_extended:
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| 265 | t2 = bld.name_to_obj(obj, bld.env)
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| 266 | if t2 and t2.samba_type in [ 'SUBSYSTEM', 'ASN1' ]:
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| 267 | if not t.sname in t2.in_library:
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| 268 | t2.in_library.append(t.sname)
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| 269 | bld.env.done_build_library_names = True
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| 270 |
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| 271 |
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| 272 | def check_library_deps(bld, t):
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| 273 | '''check that all the autodeps that have mutual dependency of this
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| 274 | target are in the same library as the target'''
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| 275 |
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| 276 | name = real_name(t.sname)
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| 277 |
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| 278 | if len(t.in_library) > 1:
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| 279 | Logs.warn("WARNING: Target '%s' in multiple libraries: %s" % (t.sname, t.in_library))
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| 280 |
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| 281 | for dep in t.autodeps:
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| 282 | t2 = bld.name_to_obj(dep, bld.env)
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| 283 | if t2 is None:
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| 284 | continue
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| 285 | for dep2 in t2.autodeps:
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| 286 | if dep2 == name and t.in_library != t2.in_library:
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| 287 | Logs.warn("WARNING: mutual dependency %s <=> %s" % (name, real_name(t2.sname)))
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| 288 | Logs.warn("Libraries should match. %s != %s" % (t.in_library, t2.in_library))
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| 289 | # raise Utils.WafError("illegal mutual dependency")
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| 290 |
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| 291 |
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| 292 | def check_syslib_collisions(bld, tgt_list):
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| 293 | '''check if a target has any symbol collisions with a syslib
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| 294 |
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| 295 | We do not want any code in Samba to use a symbol name from a
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| 296 | system library. The chance of that causing problems is just too
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| 297 | high. Note that libreplace uses a rep_XX approach of renaming
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| 298 | symbols via macros
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| 299 | '''
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| 300 |
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| 301 | has_error = False
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| 302 | for t in tgt_list:
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| 303 | for lib in bld.env.syslib_symbols:
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| 304 | common = t.public_symbols.intersection(bld.env.syslib_symbols[lib])
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| 305 | if common:
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| 306 | Logs.error("ERROR: Target '%s' has symbols '%s' which is also in syslib '%s'" % (t.sname, common, lib))
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| 307 | has_error = True
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| 308 | if has_error:
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| 309 | raise Utils.WafError("symbols in common with system libraries")
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| 310 |
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| 311 |
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| 312 | def check_dependencies(bld, t):
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| 313 | '''check for depenencies that should be changed'''
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| 314 |
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| 315 | if bld.name_to_obj(t.sname + ".objlist", bld.env):
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| 316 | return
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| 317 |
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| 318 | targets = LOCAL_CACHE(bld, 'TARGET_TYPE')
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| 319 |
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| 320 | remaining = t.undefined_symbols.copy()
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| 321 | remaining = remaining.difference(t.public_symbols)
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| 322 |
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| 323 | sname = real_name(t.sname)
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| 324 |
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| 325 | deps = set(t.samba_deps)
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| 326 | for d in t.samba_deps:
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| 327 | if targets[d] in [ 'EMPTY', 'DISABLED', 'SYSLIB' ]:
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| 328 | continue
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| 329 | bld.ASSERT(d in bld.env.public_symbols, "Failed to find symbol list for dependency '%s'" % d)
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| 330 | diff = remaining.intersection(bld.env.public_symbols[d])
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| 331 | if not diff and targets[sname] != 'LIBRARY':
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| 332 | Logs.info("Target '%s' has no dependency on %s" % (sname, d))
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| 333 | else:
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| 334 | remaining = remaining.difference(diff)
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| 335 |
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| 336 | t.unsatisfied_symbols = set()
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| 337 | needed = {}
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| 338 | for sym in remaining:
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| 339 | if sym in bld.env.symbol_map:
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| 340 | dep = bld.env.symbol_map[sym]
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| 341 | if not dep[0] in needed:
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| 342 | needed[dep[0]] = set()
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| 343 | needed[dep[0]].add(sym)
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| 344 | else:
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| 345 | t.unsatisfied_symbols.add(sym)
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| 346 |
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| 347 | for dep in needed:
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| 348 | Logs.info("Target '%s' should add dep '%s' for symbols %s" % (sname, dep, " ".join(needed[dep])))
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| 349 |
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| 350 |
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| 351 |
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| 352 | def check_syslib_dependencies(bld, t):
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| 353 | '''check for syslib depenencies'''
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| 354 |
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| 355 | if bld.name_to_obj(t.sname + ".objlist", bld.env):
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| 356 | return
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| 357 |
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| 358 | sname = real_name(t.sname)
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| 359 |
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| 360 | remaining = set()
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| 361 |
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| 362 | features = TO_LIST(t.features)
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| 363 | if 'pyembed' in features or 'pyext' in features:
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| 364 | t.unsatisfied_symbols = t.unsatisfied_symbols.difference(bld.env.public_symbols['python'])
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| 365 |
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| 366 | needed = {}
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| 367 | for sym in t.unsatisfied_symbols:
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| 368 | if sym in bld.env.symbol_map:
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| 369 | dep = bld.env.symbol_map[sym][0]
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| 370 | if dep == 'c':
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| 371 | continue
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| 372 | if not dep in needed:
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| 373 | needed[dep] = set()
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| 374 | needed[dep].add(sym)
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| 375 | else:
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| 376 | remaining.add(sym)
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| 377 |
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| 378 | for dep in needed:
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| 379 | Logs.info("Target '%s' should add syslib dep '%s' for symbols %s" % (sname, dep, " ".join(needed[dep])))
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| 380 |
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| 381 | if remaining:
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| 382 | debug("deps: Target '%s' has unsatisfied symbols: %s" % (sname, " ".join(remaining)))
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| 383 |
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| 384 |
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| 385 |
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| 386 | def symbols_symbolcheck(task):
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| 387 | '''check the internal dependency lists'''
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| 388 | bld = task.env.bld
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| 389 | tgt_list = get_tgt_list(bld)
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| 390 |
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| 391 | build_symbol_sets(bld, tgt_list)
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| 392 | build_library_names(bld, tgt_list)
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| 393 |
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| 394 | for t in tgt_list:
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| 395 | t.autodeps = set()
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| 396 | if getattr(t, 'source', ''):
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| 397 | build_autodeps(bld, t)
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| 398 |
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| 399 | for t in tgt_list:
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| 400 | check_dependencies(bld, t)
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| 401 |
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| 402 | for t in tgt_list:
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| 403 | check_library_deps(bld, t)
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| 404 |
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| 405 | def symbols_syslibcheck(task):
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| 406 | '''check the syslib dependencies'''
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| 407 | bld = task.env.bld
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| 408 | tgt_list = get_tgt_list(bld)
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| 409 |
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| 410 | build_syslib_sets(bld, tgt_list)
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| 411 | check_syslib_collisions(bld, tgt_list)
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| 412 |
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| 413 | for t in tgt_list:
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| 414 | check_syslib_dependencies(bld, t)
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| 415 |
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| 416 |
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| 417 | def symbols_whyneeded(task):
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| 418 | """check why 'target' needs to link to 'subsystem'"""
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| 419 | bld = task.env.bld
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| 420 | tgt_list = get_tgt_list(bld)
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| 421 |
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| 422 | why = Options.options.WHYNEEDED.split(":")
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| 423 | if len(why) != 2:
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| 424 | raise Utils.WafError("usage: WHYNEEDED=TARGET:DEPENDENCY")
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| 425 | target = why[0]
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| 426 | subsystem = why[1]
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| 427 |
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| 428 | build_symbol_sets(bld, tgt_list)
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| 429 | build_library_names(bld, tgt_list)
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| 430 | build_syslib_sets(bld, tgt_list)
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| 431 |
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| 432 | Logs.info("Checking why %s needs to link to %s" % (target, subsystem))
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| 433 | if not target in bld.env.used_symbols:
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| 434 | Logs.warn("unable to find target '%s' in used_symbols dict" % target)
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| 435 | return
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| 436 | if not subsystem in bld.env.public_symbols:
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| 437 | Logs.warn("unable to find subsystem '%s' in public_symbols dict" % subsystem)
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| 438 | return
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| 439 | overlap = bld.env.used_symbols[target].intersection(bld.env.public_symbols[subsystem])
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| 440 | if not overlap:
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| 441 | Logs.info("target '%s' doesn't use any public symbols from '%s'" % (target, subsystem))
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| 442 | else:
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| 443 | Logs.info("target '%s' uses symbols %s from '%s'" % (target, overlap, subsystem))
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| 444 |
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|---|
| 445 |
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| 446 |
|
|---|
| 447 | def symbols_dupcheck(task):
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| 448 | '''check for symbols defined in two different subsystems'''
|
|---|
| 449 | bld = task.env.bld
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| 450 | tgt_list = get_tgt_list(bld)
|
|---|
| 451 |
|
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| 452 | targets = LOCAL_CACHE(bld, 'TARGET_TYPE')
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| 453 |
|
|---|
| 454 | Logs.info("Checking for duplicate symbols")
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| 455 | for sym in bld.env.symbol_map:
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| 456 | subsystems = set(bld.env.symbol_map[sym])
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|---|
| 457 | if len(subsystems) == 1:
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| 458 | continue
|
|---|
| 459 |
|
|---|
| 460 | if sym in ['main', '_init', '_fini', 'init_samba_module', 'samba_init_module', 'ldb_init_module' ]:
|
|---|
| 461 | # these are expected to be in many subsystems
|
|---|
| 462 | continue
|
|---|
| 463 |
|
|---|
| 464 | # if all of them are in system libraries, we can ignore them. This copes
|
|---|
| 465 | # with the duplication between libc, libpthread and libattr
|
|---|
| 466 | all_syslib = True
|
|---|
| 467 | for s in subsystems:
|
|---|
| 468 | if s != 'c' and (not s in targets or targets[s] != 'SYSLIB'):
|
|---|
| 469 | all_syslib = False
|
|---|
| 470 | if all_syslib:
|
|---|
| 471 | continue
|
|---|
| 472 | Logs.info("symbol %s appears in %s" % (sym, subsystems))
|
|---|
| 473 |
|
|---|
| 474 |
|
|---|
| 475 | def SYMBOL_CHECK(bld):
|
|---|
| 476 | '''check our dependency lists'''
|
|---|
| 477 | if Options.options.SYMBOLCHECK:
|
|---|
| 478 | bld.SET_BUILD_GROUP('symbolcheck')
|
|---|
| 479 | task = bld(rule=symbols_symbolcheck, always=True, name='symbol checking')
|
|---|
| 480 | task.env.bld = bld
|
|---|
| 481 |
|
|---|
| 482 | bld.SET_BUILD_GROUP('syslibcheck')
|
|---|
| 483 | task = bld(rule=symbols_syslibcheck, always=True, name='syslib checking')
|
|---|
| 484 | task.env.bld = bld
|
|---|
| 485 |
|
|---|
| 486 | bld.SET_BUILD_GROUP('syslibcheck')
|
|---|
| 487 | task = bld(rule=symbols_dupcheck, always=True, name='symbol duplicate checking')
|
|---|
| 488 | task.env.bld = bld
|
|---|
| 489 |
|
|---|
| 490 | if Options.options.WHYNEEDED:
|
|---|
| 491 | bld.SET_BUILD_GROUP('syslibcheck')
|
|---|
| 492 | task = bld(rule=symbols_whyneeded, always=True, name='check why a dependency is needed')
|
|---|
| 493 | task.env.bld = bld
|
|---|
| 494 |
|
|---|
| 495 |
|
|---|
| 496 | Build.BuildContext.SYMBOL_CHECK = SYMBOL_CHECK
|
|---|
