"""SCons.Debug
Code for debugging SCons internal things. Shouldn't be
needed by most users. Quick shortcuts:
from SCons.Debug import caller_trace
caller_trace()
"""
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__revision__ = "__FILE__ __REVISION__ __DATE__ __DEVELOPER__"
import atexit
import os
import sys
import time
import weakref
import inspect
# Global variable that gets set to 'True' by the Main script,
# when the creation of class instances should get tracked.
track_instances = False
# List of currently tracked classes
tracked_classes = {}
[docs]def logInstanceCreation(instance, name=None):
if name is None:
name = instance.__class__.__name__
if name not in tracked_classes:
tracked_classes[name] = []
if hasattr(instance, '__dict__'):
tracked_classes[name].append(weakref.ref(instance))
else:
# weakref doesn't seem to work when the instance
# contains only slots...
tracked_classes[name].append(instance)
[docs]def string_to_classes(s):
if s == '*':
return sorted(tracked_classes.keys())
else:
return s.split()
[docs]def fetchLoggedInstances(classes="*"):
classnames = string_to_classes(classes)
return [(cn, len(tracked_classes[cn])) for cn in classnames]
[docs]def countLoggedInstances(classes, file=sys.stdout):
for classname in string_to_classes(classes):
file.write("%s: %d\n" % (classname, len(tracked_classes[classname])))
[docs]def listLoggedInstances(classes, file=sys.stdout):
for classname in string_to_classes(classes):
file.write('\n%s:\n' % classname)
for ref in tracked_classes[classname]:
if inspect.isclass(ref):
obj = ref()
else:
obj = ref
if obj is not None:
file.write(' %s\n' % repr(obj))
[docs]def dumpLoggedInstances(classes, file=sys.stdout):
for classname in string_to_classes(classes):
file.write('\n%s:\n' % classname)
for ref in tracked_classes[classname]:
obj = ref()
if obj is not None:
file.write(' %s:\n' % obj)
for key, value in obj.__dict__.items():
file.write(' %20s : %s\n' % (key, value))
if sys.platform[:5] == "linux":
# Linux doesn't actually support memory usage stats from getrusage().
def memory():
with open('/proc/self/stat') as f:
mstr = f.read()
mstr = mstr.split()[22]
return int(mstr)
elif sys.platform[:6] == 'darwin':
#TODO really get memory stats for OS X
def memory():
return 0
else:
try:
import resource
except ImportError:
try:
import win32process
import win32api
except ImportError:
def memory():
return 0
else:
def memory():
process_handle = win32api.GetCurrentProcess()
memory_info = win32process.GetProcessMemoryInfo( process_handle )
return memory_info['PeakWorkingSetSize']
else:
[docs] def memory():
res = resource.getrusage(resource.RUSAGE_SELF)
return res[4]
# returns caller's stack
[docs]def caller_stack():
import traceback
tb = traceback.extract_stack()
# strip itself and the caller from the output
tb = tb[:-2]
result = []
for back in tb:
# (filename, line number, function name, text)
key = back[:3]
result.append('%s:%d(%s)' % func_shorten(key))
return result
caller_bases = {}
caller_dicts = {}
[docs]def caller_trace(back=0):
"""
Trace caller stack and save info into global dicts, which
are printed automatically at the end of SCons execution.
"""
global caller_bases, caller_dicts
import traceback
tb = traceback.extract_stack(limit=3+back)
tb.reverse()
callee = tb[1][:3]
caller_bases[callee] = caller_bases.get(callee, 0) + 1
for caller in tb[2:]:
caller = callee + caller[:3]
try:
entry = caller_dicts[callee]
except KeyError:
caller_dicts[callee] = entry = {}
entry[caller] = entry.get(caller, 0) + 1
callee = caller
# print a single caller and its callers, if any
[docs]def _dump_one_caller(key, file, level=0):
leader = ' '*level
for v,c in sorted([(-v,c) for c,v in caller_dicts[key].items()]):
file.write("%s %6d %s:%d(%s)\n" % ((leader,-v) + func_shorten(c[-3:])))
if c in caller_dicts:
_dump_one_caller(c, file, level+1)
# print each call tree
[docs]def dump_caller_counts(file=sys.stdout):
for k in sorted(caller_bases.keys()):
file.write("Callers of %s:%d(%s), %d calls:\n"
% (func_shorten(k) + (caller_bases[k],)))
_dump_one_caller(k, file)
shorten_list = [
( '/scons/SCons/', 1),
( '/src/engine/SCons/', 1),
( '/usr/lib/python', 0),
]
if os.sep != '/':
shorten_list = [(t[0].replace('/', os.sep), t[1]) for t in shorten_list]
[docs]def func_shorten(func_tuple):
f = func_tuple[0]
for t in shorten_list:
i = f.find(t[0])
if i >= 0:
if t[1]:
i = i + len(t[0])
return (f[i:],)+func_tuple[1:]
return func_tuple
TraceFP = {}
if sys.platform == 'win32':
TraceDefault = 'con'
else:
TraceDefault = '/dev/tty'
TimeStampDefault = False
StartTime = time.time()
PreviousTime = StartTime
[docs]def Trace(msg, filename=None, mode='w', tstamp=False):
"""Write a trace message.
Write messages when debugging which do not interfere with stdout.
Useful in tests, which monitor stdout and would break with
unexpected output. Trace messages can go to the console (which is
opened as a file), or to a disk file; the file argument persists
across calls unless overridden.
Args:
filename: file to write trace message to. If omitted,
write to the previous trace file (default: console).
mode: file open mode (default: 'w')
tstamp: write relative timestamps with trace. Outputs time since
scons was started, and time since last trace (default: False)
"""
global TraceDefault
global TimeStampDefault
global PreviousTime
def trace_cleanup(traceFP):
traceFP.close()
if file is None:
file = TraceDefault
else:
TraceDefault = file
if not tstamp:
tstamp = TimeStampDefault
else:
TimeStampDefault = tstamp
try:
fp = TraceFP[file]
except KeyError:
try:
fp = TraceFP[file] = open(file, mode)
atexit.register(trace_cleanup, fp)
except TypeError:
# Assume we were passed an open file pointer.
fp = file
if tstamp:
now = time.time()
fp.write('%8.4f %8.4f: ' % (now - StartTime, now - PreviousTime))
PreviousTime = now
fp.write(msg)
fp.flush()
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