--- /dev/null Thu Jan 01 00:00:00 1970 +0000
+++ b/eric7/DebugClients/Python/coverage/pytracer.py Sat May 15 18:45:04 2021 +0200
@@ -0,0 +1,245 @@
+# Licensed under the Apache License: http://www.apache.org/licenses/LICENSE-2.0
+# For details: https://github.com/nedbat/coveragepy/blob/master/NOTICE.txt
+
+"""Raw data collector for coverage.py."""
+
+import atexit
+import dis
+import sys
+
+from coverage import env
+
+# We need the YIELD_VALUE opcode below, in a comparison-friendly form.
+YIELD_VALUE = dis.opmap['YIELD_VALUE']
+if env.PY2:
+ YIELD_VALUE = chr(YIELD_VALUE)
+
+
+class PyTracer(object):
+ """Python implementation of the raw data tracer."""
+
+ # Because of poor implementations of trace-function-manipulating tools,
+ # the Python trace function must be kept very simple. In particular, there
+ # must be only one function ever set as the trace function, both through
+ # sys.settrace, and as the return value from the trace function. Put
+ # another way, the trace function must always return itself. It cannot
+ # swap in other functions, or return None to avoid tracing a particular
+ # frame.
+ #
+ # The trace manipulator that introduced this restriction is DecoratorTools,
+ # which sets a trace function, and then later restores the pre-existing one
+ # by calling sys.settrace with a function it found in the current frame.
+ #
+ # Systems that use DecoratorTools (or similar trace manipulations) must use
+ # PyTracer to get accurate results. The command-line --timid argument is
+ # used to force the use of this tracer.
+
+ def __init__(self):
+ # Attributes set from the collector:
+ self.data = None
+ self.trace_arcs = False
+ self.should_trace = None
+ self.should_trace_cache = None
+ self.should_start_context = None
+ self.warn = None
+ # The threading module to use, if any.
+ self.threading = None
+
+ self.cur_file_dict = None
+ self.last_line = 0 # int, but uninitialized.
+ self.cur_file_name = None
+ self.context = None
+ self.started_context = False
+
+ self.data_stack = []
+ self.last_exc_back = None
+ self.last_exc_firstlineno = 0
+ self.thread = None
+ self.stopped = False
+ self._activity = False
+
+ self.in_atexit = False
+ # On exit, self.in_atexit = True
+ atexit.register(setattr, self, 'in_atexit', True)
+
+ def __repr__(self):
+ return "<PyTracer at {}: {} lines in {} files>".format(
+ id(self),
+ sum(len(v) for v in self.data.values()),
+ len(self.data),
+ )
+
+ def log(self, marker, *args):
+ """For hard-core logging of what this tracer is doing."""
+ with open("/tmp/debug_trace.txt", "a") as f:
+ f.write("{} {:x}.{:x}[{}] {:x} {}\n".format(
+ marker,
+ id(self),
+ self.thread.ident,
+ len(self.data_stack),
+ self.threading.currentThread().ident,
+ " ".join(map(str, args))
+ ))
+
+ def _trace(self, frame, event, arg_unused):
+ """The trace function passed to sys.settrace."""
+
+ #self.log(":", frame.f_code.co_filename, frame.f_lineno, event)
+
+ if (self.stopped and sys.gettrace() == self._trace): # pylint: disable=comparison-with-callable
+ # The PyTrace.stop() method has been called, possibly by another
+ # thread, let's deactivate ourselves now.
+ #self.log("X", frame.f_code.co_filename, frame.f_lineno)
+ sys.settrace(None)
+ return None
+
+ if self.last_exc_back:
+ if frame == self.last_exc_back:
+ # Someone forgot a return event.
+ if self.trace_arcs and self.cur_file_dict:
+ pair = (self.last_line, -self.last_exc_firstlineno)
+ self.cur_file_dict[pair] = None
+ self.cur_file_dict, self.cur_file_name, self.last_line, self.started_context = (
+ self.data_stack.pop()
+ )
+ self.last_exc_back = None
+
+ if event == 'call':
+ # Should we start a new context?
+ if self.should_start_context and self.context is None:
+ context_maybe = self.should_start_context(frame) # pylint: disable=not-callable
+ if context_maybe is not None:
+ self.context = context_maybe
+ self.started_context = True
+ self.switch_context(self.context)
+ else:
+ self.started_context = False
+ else:
+ self.started_context = False
+
+ # Entering a new frame. Decide if we should trace
+ # in this file.
+ self._activity = True
+ self.data_stack.append(
+ (
+ self.cur_file_dict,
+ self.cur_file_name,
+ self.last_line,
+ self.started_context,
+ )
+ )
+ filename = frame.f_code.co_filename
+ self.cur_file_name = filename
+ disp = self.should_trace_cache.get(filename)
+ if disp is None:
+ disp = self.should_trace(filename, frame) # pylint: disable=not-callable
+ self.should_trace_cache[filename] = disp # pylint: disable=unsupported-assignment-operation
+
+ self.cur_file_dict = None
+ if disp.trace:
+ tracename = disp.source_filename
+ if tracename not in self.data: # pylint: disable=unsupported-membership-test
+ self.data[tracename] = {} # pylint: disable=unsupported-assignment-operation
+ self.cur_file_dict = self.data[tracename] # pylint: disable=unsubscriptable-object
+ # The call event is really a "start frame" event, and happens for
+ # function calls and re-entering generators. The f_lasti field is
+ # -1 for calls, and a real offset for generators. Use <0 as the
+ # line number for calls, and the real line number for generators.
+ if getattr(frame, 'f_lasti', -1) < 0:
+ self.last_line = -frame.f_code.co_firstlineno
+ else:
+ self.last_line = frame.f_lineno
+ elif event == 'line':
+ # Record an executed line.
+ if self.cur_file_dict is not None:
+ lineno = frame.f_lineno
+ #if frame.f_code.co_filename != self.cur_file_name:
+ # self.log("*", frame.f_code.co_filename, self.cur_file_name, lineno)
+ if self.trace_arcs:
+ self.cur_file_dict[(self.last_line, lineno)] = None
+ else:
+ self.cur_file_dict[lineno] = None
+ self.last_line = lineno
+ elif event == 'return':
+ if self.trace_arcs and self.cur_file_dict:
+ # Record an arc leaving the function, but beware that a
+ # "return" event might just mean yielding from a generator.
+ # Jython seems to have an empty co_code, so just assume return.
+ code = frame.f_code.co_code
+ if (not code) or code[frame.f_lasti] != YIELD_VALUE:
+ first = frame.f_code.co_firstlineno
+ self.cur_file_dict[(self.last_line, -first)] = None
+ # Leaving this function, pop the filename stack.
+ self.cur_file_dict, self.cur_file_name, self.last_line, self.started_context = (
+ self.data_stack.pop()
+ )
+ # Leaving a context?
+ if self.started_context:
+ self.context = None
+ self.switch_context(None)
+ elif event == 'exception':
+ self.last_exc_back = frame.f_back
+ self.last_exc_firstlineno = frame.f_code.co_firstlineno
+ return self._trace
+
+ def start(self):
+ """Start this Tracer.
+
+ Return a Python function suitable for use with sys.settrace().
+
+ """
+ self.stopped = False
+ if self.threading:
+ if self.thread is None:
+ self.thread = self.threading.currentThread()
+ else:
+ if self.thread.ident != self.threading.currentThread().ident:
+ # Re-starting from a different thread!? Don't set the trace
+ # function, but we are marked as running again, so maybe it
+ # will be ok?
+ #self.log("~", "starting on different threads")
+ return self._trace
+
+ sys.settrace(self._trace)
+ return self._trace
+
+ def stop(self):
+ """Stop this Tracer."""
+ # Get the active tracer callback before setting the stop flag to be
+ # able to detect if the tracer was changed prior to stopping it.
+ tf = sys.gettrace()
+
+ # Set the stop flag. The actual call to sys.settrace(None) will happen
+ # in the self._trace callback itself to make sure to call it from the
+ # right thread.
+ self.stopped = True
+
+ if self.threading and self.thread.ident != self.threading.currentThread().ident:
+ # Called on a different thread than started us: we can't unhook
+ # ourselves, but we've set the flag that we should stop, so we
+ # won't do any more tracing.
+ #self.log("~", "stopping on different threads")
+ return
+
+ if self.warn:
+ # PyPy clears the trace function before running atexit functions,
+ # so don't warn if we are in atexit on PyPy and the trace function
+ # has changed to None.
+ dont_warn = (env.PYPY and env.PYPYVERSION >= (5, 4) and self.in_atexit and tf is None)
+ if (not dont_warn) and tf != self._trace: # pylint: disable=comparison-with-callable
+ self.warn( # pylint: disable=not-callable
+ "Trace function changed, measurement is likely wrong: %r" % (tf,),
+ slug="trace-changed",
+ )
+
+ def activity(self):
+ """Has there been any activity?"""
+ return self._activity
+
+ def reset_activity(self):
+ """Reset the activity() flag."""
+ self._activity = False
+
+ def get_stats(self):
+ """Return a dictionary of statistics, or None."""
+ return None
