SCons.Debug

1 """SCons.Debug 2 3 Code for debugging SCons internal things. Shouldn't be 4 needed by most users. Quick shortcuts: 5 6 from SCons.Debug import caller_trace 7 caller_trace() 8 9 """ 10 11 # 12 # Copyright (c) 2001 - 2019 The SCons Foundation 13 # 14 # Permission is hereby granted, free of charge, to any person obtaining 15 # a copy of this software and associated documentation files (the 16 # "Software"), to deal in the Software without restriction, including 17 # without limitation the rights to use, copy, modify, merge, publish, 18 # distribute, sublicense, and/or sell copies of the Software, and to 19 # permit persons to whom the Software is furnished to do so, subject to 20 # the following conditions: 21 # 22 # The above copyright notice and this permission notice shall be included 23 # in all copies or substantial portions of the Software. 24 # 25 # THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY 26 # KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE 27 # WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND 28 # NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE 29 # LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION 30 # OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION 31 # WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. 32 # 33 34 __revision__ = "src/engine/SCons/Debug.py 3a41ed6b288cee8d085373ad7fa02894e1903864 2019-01-23 17:30:35 bdeegan" 35 36 import os 37 import sys 38 import time 39 import weakref 40 import inspect 41 42 # Global variable that gets set to 'True' by the Main script, 43 # when the creation of class instances should get tracked. 44 track_instances = False 45 # List of currently tracked classes 46 tracked_classes = {} 47

48 -def logInstanceCreation(instance, name=None):

49 if name is None: 50 name = instance.__class__.__name__ 51 if name not in tracked_classes: 52 tracked_classes[name] = [] 53 if hasattr(instance, '__dict__'): 54 tracked_classes[name].append(weakref.ref(instance)) 55 else: 56 # weakref doesn't seem to work when the instance 57 # contains only slots... 58 tracked_classes[name].append(instance)

59

60 -def string_to_classes(s):

61 if s == '*': 62 return sorted(tracked_classes.keys()) 63 else: 64 return s.split()

65

66 -def fetchLoggedInstances(classes="*"):

67 classnames = string_to_classes(classes) 68 return [(cn, len(tracked_classes[cn])) for cn in classnames]

69

70 -def countLoggedInstances(classes, file=sys.stdout):

71 for classname in string_to_classes(classes): 72 file.write("%s: %d\n" % (classname, len(tracked_classes[classname])))

73

74 -def listLoggedInstances(classes, file=sys.stdout):

75 for classname in string_to_classes(classes): 76 file.write('\n%s:\n' % classname) 77 for ref in tracked_classes[classname]: 78 if inspect.isclass(ref): 79 obj = ref() 80 else: 81 obj = ref 82 if obj is not None: 83 file.write(' %s\n' % repr(obj))

84

85 -def dumpLoggedInstances(classes, file=sys.stdout):

86 for classname in string_to_classes(classes): 87 file.write('\n%s:\n' % classname) 88 for ref in tracked_classes[classname]: 89 obj = ref() 90 if obj is not None: 91 file.write(' %s:\n' % obj) 92 for key, value in obj.__dict__.items(): 93 file.write(' %20s : %s\n' % (key, value))

94 95 96 97 if sys.platform[:5] == "linux": 98 # Linux doesn't actually support memory usage stats from getrusage().

99 - def memory():

100 with open('/proc/self/stat') as f: 101 mstr = f.read() 102 mstr = mstr.split()[22] 103 return int(mstr)

104 elif sys.platform[:6] == 'darwin': 105 #TODO really get memory stats for OS X

106 - def memory():

107 return 0

108 else: 109 try: 110 import resource 111 except ImportError: 112 try: 113 import win32process 114 import win32api 115 except ImportError:

116 - def memory():

117 return 0

118 else:

119 - def memory():

120 process_handle = win32api.GetCurrentProcess() 121 memory_info = win32process.GetProcessMemoryInfo( process_handle ) 122 return memory_info['PeakWorkingSetSize']

123 else:

124 - def memory():

125 res = resource.getrusage(resource.RUSAGE_SELF) 126 return res[4]

127 128 # returns caller's stack

129 -def caller_stack():

130 import traceback 131 tb = traceback.extract_stack() 132 # strip itself and the caller from the output 133 tb = tb[:-2] 134 result = [] 135 for back in tb: 136 # (filename, line number, function name, text) 137 key = back[:3] 138 result.append('%s:%d(%s)' % func_shorten(key)) 139 return result

140 141 caller_bases = {} 142 caller_dicts = {} 143

144 -def caller_trace(back=0):

145 """ 146 Trace caller stack and save info into global dicts, which 147 are printed automatically at the end of SCons execution. 148 """ 149 global caller_bases, caller_dicts 150 import traceback 151 tb = traceback.extract_stack(limit=3+back) 152 tb.reverse() 153 callee = tb[1][:3] 154 caller_bases[callee] = caller_bases.get(callee, 0) + 1 155 for caller in tb[2:]: 156 caller = callee + caller[:3] 157 try: 158 entry = caller_dicts[callee] 159 except KeyError: 160 caller_dicts[callee] = entry = {} 161 entry[caller] = entry.get(caller, 0) + 1 162 callee = caller

163 164 # print a single caller and its callers, if any

165 -def _dump_one_caller(key, file, level=0):

166 leader = ' '*level 167 for v,c in sorted([(-v,c) for c,v in caller_dicts[key].items()]): 168 file.write("%s %6d %s:%d(%s)\n" % ((leader,-v) + func_shorten(c[-3:]))) 169 if c in caller_dicts: 170 _dump_one_caller(c, file, level+1)

171 172 # print each call tree

173 -def dump_caller_counts(file=sys.stdout):

174 for k in sorted(caller_bases.keys()): 175 file.write("Callers of %s:%d(%s), %d calls:\n" 176 % (func_shorten(k) + (caller_bases[k],))) 177 _dump_one_caller(k, file)

178 179 shorten_list = [ 180 ( '/scons/SCons/', 1), 181 ( '/src/engine/SCons/', 1), 182 ( '/usr/lib/python', 0), 183 ] 184 185 if os.sep != '/': 186 shorten_list = [(t[0].replace('/', os.sep), t[1]) for t in shorten_list] 187

188 -def func_shorten(func_tuple):

189 f = func_tuple[0] 190 for t in shorten_list: 191 i = f.find(t[0]) 192 if i >= 0: 193 if t[1]: 194 i = i + len(t[0]) 195 return (f[i:],)+func_tuple[1:] 196 return func_tuple

197 198 199 TraceFP = {} 200 if sys.platform == 'win32': 201 TraceDefault = 'con' 202 else: 203 TraceDefault = '/dev/tty' 204 205 TimeStampDefault = None 206 StartTime = time.time() 207 PreviousTime = StartTime 208

209 -def Trace(msg, file=None, mode='w', tstamp=None):

210 """Write a trace message to a file. Whenever a file is specified, 211 it becomes the default for the next call to Trace().""" 212 global TraceDefault 213 global TimeStampDefault 214 global PreviousTime 215 if file is None: 216 file = TraceDefault 217 else: 218 TraceDefault = file 219 if tstamp is None: 220 tstamp = TimeStampDefault 221 else: 222 TimeStampDefault = tstamp 223 try: 224 fp = TraceFP[file] 225 except KeyError: 226 try: 227 fp = TraceFP[file] = open(file, mode) 228 except TypeError: 229 # Assume we were passed an open file pointer. 230 fp = file 231 if tstamp: 232 now = time.time() 233 fp.write('%8.4f %8.4f: ' % (now - StartTime, now - PreviousTime)) 234 PreviousTime = now 235 fp.write(msg) 236 fp.flush() 237 fp.close()

238 239 # Local Variables: 240 # tab-width:4 241 # indent-tabs-mode:nil 242 # End: 243 # vim: set expandtab tabstop=4 shiftwidth=4: 244

Source Code for Module SCons.Debug