Optimization: Also decide writing traces for parameter variables faster

nuitka/Variables.py

@@ -175,12 +175,22 @@ class Variable(getMetaClassBase("Variable", require_slots=True)):
         return self.traces
 
     def hasEmptyTracesFor(self, owner):
+        """Do these traces contain any usage."""
         for trace in self.traces:
             if trace.owner is owner and trace.isUsingTrace():
                 return False
 
         return True
 
+    def hasNoWritingTraces(self):
+        """Do these traces contain any writes."""
+
+        for trace in self.traces:
+            if trace.isWritingTrace():
+                return False
+
+        return True
+
     def updateUsageState(self):
         writers = set()
         users = set()
@@ -191,7 +201,7 @@ class Variable(getMetaClassBase("Variable", require_slots=True)):
 
             if trace.isAssignTrace():
                 writers.add(owner)
-            elif trace.isDeletedTrace() and owner is not self.owner:
+            elif owner is not self.owner and trace.isDeletedTrace():
                 writers.add(owner)
 
         self.writers = writers

nuitka/nodes/FunctionNodes.py

@@ -416,7 +416,7 @@ class ExpressionFunctionBodyBase(
 
     def optimizeVariableReleases(self):
         for parameter_variable in self.getParameterVariablesWithManualRelease():
-            read_only = self.trace_collection.hasReadOnlyTraces(parameter_variable)
+            read_only = parameter_variable.hasNoWritingTraces()
 
             if read_only:
                 self.trace_collection.signalChange(

nuitka/optimizations/TraceCollections.py

@@ -88,17 +88,6 @@ class CollectionUpdateMixin(object):
     def getVariableTrace(self, variable, version):
         return self.variable_traces[(variable, version)]
 
-    def getVariableTraces(self, variable):
-        result = []
-
-        for key, variable_trace in iterItems(self.variable_traces):
-            candidate = key[0]
-
-            if variable is candidate:
-                result.append(variable_trace)
-
-        return result
-
     def getVariableTracesAll(self):
         return self.variable_traces
 
@@ -208,11 +197,7 @@ class CollectionStartPointMixin(CollectionUpdateMixin):
     def getExceptionRaiseCollections(self):
         return self.exception_collections
 
-    def hasReadOnlyTraces(self, variable):
+    # TODO: Eliminate this function, call it directly where this is used.
-        # TODO: Combine these steps into one for performance gains.
-        traces = self.getVariableTraces(variable)
-        return areReadOnlyTraces(traces)
-
     def updateVariablesFromCollection(self, old_collection, source_ref):
         Variables.updateVariablesFromCollection(old_collection, self, source_ref)
 
@@ -384,7 +369,7 @@ class TraceCollectionBase(object):
                 self.addVariableTrace(
                     variable,
                     version,
-                    ValueTraceEscaped(owner=self.owner, previous=current),
+                    ValueTraceEscaped(self.owner, current),
                 )
 
             self.markCurrentVariableTrace(variable, version)
@@ -401,21 +386,24 @@ class TraceCollectionBase(object):
                 self.addVariableTrace(
                     variable,
                     version,
-                    ValueTraceUnknown(owner=self.owner, previous=current),
+                    ValueTraceUnknown(self.owner, current),
                 )
 
             self.markCurrentVariableTrace(variable, version)
 
     def markActiveVariableAsUnknown(self, variable):
-        current = self.getVariableCurrentTrace(variable)
+        version = self.variable_actives[variable]
+        current = self.getVariableTrace(variable, version)
 
         if not current.isUnknownOrVeryTrustedTrace():
-            version = variable.allocateTargetNumber()
+            # Unknown traces are div 3 rem 2.
+            version = version // 3 * 3 + 2
 
+            if not self.hasVariableTrace(variable, version):
                 self.addVariableTrace(
                     variable,
                     version,
-                ValueTraceUnknown(owner=self.owner, previous=current),
+                    ValueTraceUnknown(self.owner, current),
                 )
 
             self.markCurrentVariableTrace(variable, version)
@@ -487,9 +475,9 @@ class TraceCollectionBase(object):
 
     def onVariableSet(self, variable, version, assign_node):
         variable_trace = ValueTraceAssign(
-            owner=self.owner,
+            self.owner,
-            assign_node=assign_node,
+            assign_node,
-            previous=self.getVariableCurrentTrace(variable),
+            self.getVariableCurrentTrace(variable),
         )
 
         self.addVariableTrace(variable, version, variable_trace)
@@ -521,9 +509,9 @@ class TraceCollectionBase(object):
 
     def onVariableSetToUnescapableValue(self, variable, version, assign_node):
         variable_trace = ValueTraceAssignUnescapable(
-            owner=self.owner,
+            self.owner,
-            assign_node=assign_node,
+            assign_node,
-            previous=self.getVariableCurrentTrace(variable),
+            self.getVariableCurrentTrace(variable),
         )
 
         self.addVariableTrace(variable, version, variable_trace)
@@ -535,9 +523,9 @@ class TraceCollectionBase(object):
 
     def onVariableSetToVeryTrustedValue(self, variable, version, assign_node):
         variable_trace = ValueTraceAssignVeryTrusted(
-            owner=self.owner,
+            self.owner,
-            assign_node=assign_node,
+            assign_node,
-            previous=self.getVariableCurrentTrace(variable),
+            self.getVariableCurrentTrace(variable),
         )
 
         self.addVariableTrace(variable, version, variable_trace)
@@ -551,10 +539,10 @@ class TraceCollectionBase(object):
         self, variable, version, assign_node, replacement
     ):
         variable_trace = ValueTraceAssignUnescapablePropagated(
-            owner=self.owner,
+            self.owner,
-            assign_node=assign_node,
+            assign_node,
-            previous=self.getVariableCurrentTrace(variable),
+            self.getVariableCurrentTrace(variable),
-            replacement=replacement,
+            replacement,
         )
 
         self.addVariableTrace(variable, version, variable_trace)
@@ -572,7 +560,9 @@ class TraceCollectionBase(object):
         # TODO: Annotate value content as escaped.
 
         variable_trace = ValueTraceDeleted(
-            owner=self.owner, del_node=del_node, previous=old_trace
+            self.owner,
+            old_trace,
+            del_node,
         )
 
         # Assign to not initialized again.
@@ -833,6 +823,8 @@ class TraceCollectionBase(object):
         with TimerReport(
             message="Running merge for %s took %%.2f seconds" % collections,
             decider=False,
+            include_sleep_time=False,
+            use_perf_counters=False,
         ):
             new_actives = {}
 
@@ -967,14 +959,14 @@ class TraceCollectionBase(object):
         )
 
     def initVariableUnknown(self, variable):
-        trace = ValueTraceUnknown(owner=self.owner, previous=None)
+        trace = ValueTraceUnknown(self.owner, None)
 
         self.addVariableTrace(variable, 0, trace)
 
         return trace
 
     def initVariableModule(self, variable):
-        trace = ValueTraceUnknown(owner=self.owner, previous=None)
+        trace = ValueTraceUnknown(self.owner, None)
 
         self.addVariableTrace(variable, 0, trace)
 
@@ -1002,7 +994,7 @@ class TraceCollectionBase(object):
         return trace
 
     def initVariableUninitialized(self, variable):
-        trace = ValueTraceUninitialized(owner=self.owner, previous=None)
+        trace = ValueTraceUninitialized(self.owner, None)
 
         self.addVariableTrace(variable, 0, trace)
 
@@ -1152,7 +1144,9 @@ class TraceCollectionFunction(CollectionStartPointMixin, TraceCollectionBase):
             return TraceCollectionBase.initVariableModule(self, variable)
 
         assign_trace = ValueTraceAssignVeryTrusted(
-            self.owner, assign_node=trusted_node.getParent(), previous=None
+            self.owner,
+            trusted_node.getParent(),
+            None,
         )
 
         self.addVariableTrace(variable, 0, assign_trace)
@@ -1254,36 +1248,6 @@ class TraceCollectionModule(CollectionStartPointMixin, TraceCollectionBase):
         self.distribution_names[distribution_name] = success
 
 
-def areReadOnlyTraces(variable_traces):
-    """Do these traces contain any writes."""
-
-    # Many cases immediately return, that is how we do it here,
-    for variable_trace in variable_traces:
-        if variable_trace.isAssignTrace():
-            return False
-        elif variable_trace.isInitTrace():
-            pass
-        elif variable_trace.isDeletedTrace():
-            # A "del" statement can do this, and needs to prevent variable
-            # from being not released.
-
-            return False
-        elif variable_trace.isUninitializedTrace():
-            pass
-        elif variable_trace.isUnknownTrace():
-            return False
-        elif variable_trace.isEscapeTrace():
-            pass
-        elif variable_trace.isMergeTrace():
-            pass
-        elif variable_trace.isLoopTrace():
-            pass
-        else:
-            assert False, variable_trace
-
-    return True
-
-
 def _checkActivesDiff(a1, a2):
     result = True
     for variable in a1:

nuitka/optimizations/ValueTraces.py

@@ -134,6 +134,10 @@ class ValueTraceBase(object):
     def isUsingTrace(self):
         """Is the trace indicating a usage of the variable."""
 
+    @abstractmethod
+    def isWritingTrace(self):
+        """Is the trace indicating a usage of the variable."""
+
     @staticmethod
     def isAssignTrace():
         return False
@@ -310,6 +314,10 @@ class ValueTraceUninitialized(ValueTraceUnassignedBase):
     def isUsingTrace(self):
         return self.usage_count
 
+    @staticmethod
+    def isWritingTrace():
+        return False
+
     @staticmethod
     def isTraceThatNeedsEscape():
         return False
@@ -336,6 +344,10 @@ class ValueTraceDeleted(ValueTraceUnassignedBase):
     def isUsingTrace():
         return True
 
+    @staticmethod
+    def isWritingTrace():
+        return True
+
     def getDelNode(self):
         return self.del_node
 
@@ -366,6 +378,10 @@ class ValueTraceInit(ValueTraceBase):
     def isUsingTrace():
         return True
 
+    @staticmethod
+    def isWritingTrace():
+        return False
+
     @staticmethod
     def mustHaveValue():
         return True
@@ -438,6 +454,10 @@ class ValueTraceUnknown(ValueTraceBase):
     def isUsingTrace(self):
         return self.usage_count
 
+    @staticmethod
+    def isWritingTrace():
+        return True
+
     @staticmethod
     def isUnknownOrVeryTrustedTrace():
         return True
@@ -518,6 +538,10 @@ class ValueTraceEscaped(ValueTraceUnknown):
     def isEscapeTrace():
         return True
 
+    @staticmethod
+    def isWritingTrace():
+        return False
+
     def isUsingTrace(self):
         return self.usage_count
 
@@ -568,6 +592,10 @@ class ValueTraceAssign(ValueTraceBase):
     def isUsingTrace():
         return True
 
+    @staticmethod
+    def isWritingTrace():
+        return True
+
     def compareValueTrace(self, other):
         return other.isAssignTrace() and self.assign_node is other.assign_node
 
@@ -673,6 +701,8 @@ class ValueTraceAssignUnescapablePropagated(ValueTraceAssignUnescapable):
 class ValueTraceMergeBase(ValueTraceBase):
     """Merge of two or more traces or start of loops."""
 
+    # Base classes can be abstract, pylint: disable=I0021,abstract-method
+
     __slots__ = ()
 
     def addNameUsage(self):
@@ -722,9 +752,9 @@ class ValueTraceMerge(ValueTraceMergeBase):
                 if trace not in shorted:
                     shorted.append(trace)
 
-        traces = tuple(shorted)
+        assert len(shorted) > 1, traces
 
-        assert len(traces) > 1
+        traces = tuple(shorted)
 
         # assert len(set(traces)) == len(traces), [(v) for v in traces]
 
@@ -775,6 +805,10 @@ class ValueTraceMerge(ValueTraceMergeBase):
         # Checking definite is enough, the merges, we shall see them as well.
         return self.usage_count
 
+    @staticmethod
+    def isWritingTrace():
+        return False
+
     def compareValueTrace(self, other):
         if not other.isMergeTrace():
             return False
@@ -866,6 +900,10 @@ class ValueTraceLoopBase(ValueTraceMergeBase):
     def isUsingTrace():
         return True
 
+    @staticmethod
+    def isWritingTrace():
+        return False
+
     def getTypeShape(self):
         if self.type_shape is None:
             if len(self.type_shapes) > 1: