ValueProfile for PSequence iteration

Author: lukasstadler

graalpython/com.oracle.graal.python/src/com/oracle/graal/python/builtins/objects/iterator/IteratorBuiltins.java

@@ -42,11 +42,13 @@
 import com.oracle.graal.python.nodes.function.PythonBuiltinBaseNode;
 import com.oracle.graal.python.nodes.function.builtins.PythonUnaryBuiltinNode;
 import com.oracle.graal.python.runtime.exception.PException;
+import com.oracle.graal.python.runtime.sequence.PSequence;
 import com.oracle.truffle.api.dsl.Cached;
 import com.oracle.truffle.api.dsl.GenerateNodeFactory;
 import com.oracle.truffle.api.dsl.NodeFactory;
 import com.oracle.truffle.api.dsl.Specialization;
 import com.oracle.truffle.api.profiles.ConditionProfile;
+import com.oracle.truffle.api.profiles.ValueProfile;
 
 @CoreFunctions(extendClasses = PSequenceIterator.class)
 public class IteratorBuiltins extends PythonBuiltins {
@@ -145,9 +147,11 @@ public Object next(PBaseSetIterator self) {
         }
 
         @Specialization(guards = "self.isPSequence()")
-        public Object next(PSequenceIterator self) {
-            if (!self.stopIterationReached && self.index < self.getPSequence().len()) {
-                return self.getPSequence().getItem(self.index++);
+        public Object next(PSequenceIterator self,
+                        @Cached("createClassProfile()") ValueProfile sequenceProfile) {
+            PSequence sequence = sequenceProfile.profile(self.getPSequence());
+            if (!self.stopIterationReached && self.index < sequence.len()) {
+                return sequence.getItem(self.index++);
             }
             self.stopIterationReached = true;
             throw raise(StopIteration);