Feature/improved delayed execution

pitest-entry/src/main/java/org/pitest/mutationtest/build/CompoundInterceptorFactory.java

@@ -1,6 +1,7 @@
 package org.pitest.mutationtest.build;
 
 import org.pitest.classinfo.ClassByteArraySource;
+import org.pitest.classpath.CodeSource;
 import org.pitest.coverage.CoverageDatabase;
 import org.pitest.mutationtest.config.ReportOptions;
 import org.pitest.plugin.FeatureSelector;
@@ -24,10 +25,11 @@ public CompoundMutationInterceptor createInterceptor(
       ReportOptions data,
       CoverageDatabase coverage,
       ClassByteArraySource source,
-      TestPrioritiser testPrioritiser
+      TestPrioritiser testPrioritiser,
+      CodeSource code
       ) {
-    final List<MutationInterceptor> interceptors = this.features.getActiveFeatures().stream()
-            .map(toInterceptor(this.features, data, coverage, source, testPrioritiser))
+    List<MutationInterceptor> interceptors = this.features.getActiveFeatures().stream()
+            .map(toInterceptor(this.features, data, coverage, source, testPrioritiser, code))
             .collect(Collectors.toList());
     return new CompoundMutationInterceptor(interceptors);
   }
@@ -38,10 +40,11 @@ private static Function<MutationInterceptorFactory, MutationInterceptor> toInter
           ReportOptions data,
           CoverageDatabase coverage,
           ClassByteArraySource source,
-          TestPrioritiser testPrioritiser
+          TestPrioritiser testPrioritiser,
+          CodeSource code
           ) {
 
-    return a -> a.createInterceptor(new InterceptorParameters(features.getSettingForFeature(a.provides().name()), data, coverage, source, testPrioritiser));
+    return a -> a.createInterceptor(new InterceptorParameters(features.getSettingForFeature(a.provides().name()), data, coverage, source, testPrioritiser, code));
 
   }
  }

pitest-entry/src/main/java/org/pitest/mutationtest/build/InterceptorParameters.java

@@ -1,6 +1,7 @@
 package org.pitest.mutationtest.build;
 
 import org.pitest.classinfo.ClassByteArraySource;
+import org.pitest.classpath.CodeSource;
 import org.pitest.coverage.CoverageDatabase;
 import org.pitest.mutationtest.config.ReportOptions;
 import org.pitest.plugin.FeatureParameter;
@@ -16,17 +17,23 @@ public final class InterceptorParameters {
   private final ReportOptions data;
   private final ClassByteArraySource source;
   private final CoverageDatabase coverage;
+  private final CodeSource code;
 
   private final TestPrioritiser testPrioritiser;
 
 
-  public InterceptorParameters(FeatureSetting conf, ReportOptions data, CoverageDatabase coverage,
-      ClassByteArraySource source, TestPrioritiser testPrioritiser) {
+  public InterceptorParameters(FeatureSetting conf,
+                               ReportOptions data,
+                               CoverageDatabase coverage,
+                               ClassByteArraySource source,
+                               TestPrioritiser testPrioritiser,
+                               CodeSource code) {
     this.conf = conf;
     this.data = data;
     this.coverage = coverage;
     this.source = source;
     this.testPrioritiser = testPrioritiser;
+    this.code = code;
   }
 
   public ReportOptions data() {
@@ -50,6 +57,10 @@ public TestPrioritiser testPrioritiser() {
     return this.testPrioritiser;
   }
 
+  public CodeSource code() {
+    return code;
+  }
+
   public Optional<String> getString(FeatureParameter limit) {
     if (this.conf == null) {
       return Optional.empty();

pitest-entry/src/main/java/org/pitest/mutationtest/build/intercept/staticinitializers/FunctionalInterfaceScanner.java

@@ -0,0 +1,30 @@
+package org.pitest.mutationtest.build.intercept.staticinitializers;
+
+import org.objectweb.asm.tree.AnnotationNode;
+import org.pitest.bytecode.analysis.ClassTree;
+import org.pitest.classpath.CodeSource;
+
+import java.util.List;
+import java.util.Set;
+import java.util.function.Function;
+import java.util.stream.Collectors;
+
+public class FunctionalInterfaceScanner implements Function<CodeSource, Set<String>> {
+    @Override
+    public Set<String> apply(CodeSource codeSource) {
+        return codeSource.codeTrees()
+                .filter(this::isFunctionalInterface)
+                .map(c -> c.rawNode().name)
+                .collect(Collectors.toSet());
+    }
+
+    private boolean isFunctionalInterface(ClassTree classTree) {
+        List<AnnotationNode> annotations = classTree.rawNode().visibleAnnotations;
+        if (annotations == null) {
+            return false;
+        }
+
+        return annotations.stream()
+                .anyMatch(a -> a.desc.equals("Ljava/lang/FunctionalInterface;"));
+    }
+}

pitest-entry/src/main/java/org/pitest/mutationtest/build/intercept/staticinitializers/StaticInitializerInterceptor.java

@@ -2,10 +2,13 @@
 
 import org.objectweb.asm.Handle;
 import org.objectweb.asm.Opcodes;
+import org.objectweb.asm.Type;
 import org.objectweb.asm.tree.AbstractInsnNode;
 import org.objectweb.asm.tree.FieldInsnNode;
+import org.objectweb.asm.tree.FieldNode;
 import org.objectweb.asm.tree.InvokeDynamicInsnNode;
 import org.objectweb.asm.tree.MethodInsnNode;
+import org.pitest.bytecode.SignatureParser;
 import org.pitest.bytecode.analysis.ClassTree;
 import org.pitest.bytecode.analysis.MethodTree;
 import org.pitest.classinfo.ClassName;
@@ -21,6 +24,7 @@
 import org.pitest.sequence.SequenceMatcher;
 import org.pitest.sequence.SequenceQuery;
 import org.pitest.sequence.Slot;
+import org.pitest.sequence.SlotRead;
 import org.pitest.sequence.SlotWrite;
 
 import java.util.Arrays;
@@ -53,47 +57,63 @@
  * 1. In a static initializer (i.e <clinit>)
  * 2. In a private method or constructor called from <clinit> or another private method in the call tree
  *
- *
  */
 class StaticInitializerInterceptor implements MutationInterceptor {
 
-  static final Slot<AbstractInsnNode> START = Slot.create(AbstractInsnNode.class);
+  private final Set<String> delayedExecutionTypes;
+
+  private static final Slot<AbstractInsnNode> START = Slot.create(AbstractInsnNode.class);
+  private static final Slot<Set<String>> DELAYED_EXECUTION_FIELDS = Slot.createSet(String.class);
 
-  static final SequenceMatcher<AbstractInsnNode> DELAYED_EXECUTION = QueryStart
+  private final SequenceMatcher<AbstractInsnNode> delayedExecution = QueryStart
           .any(AbstractInsnNode.class)
           // look for calls returning delayed execution types. Unfortunately this is not guarantee that we
           // store the result to an appropriate type
           .then(returnsDeferredExecutionCode().or(dynamicallyReturnsDeferredExecutionCode()).and(store(START.write())))
           // allow for other method calls etc
           .zeroOrMore(QueryStart.match(anyInstruction()))
-          .then(enumConstructorCallAndStore().or(QueryStart.match(delayedExecutionField())))
+          .then(enumConstructorCallAndStore().or(QueryStart.match(delayedExecutionField(DELAYED_EXECUTION_FIELDS.read()))))
           .zeroOrMore(QueryStart.match(anyInstruction()))
           .compile(QueryParams.params(AbstractInsnNode.class)
                   .withIgnores(notAnInstruction())
           );
 
-  private static Match<AbstractInsnNode> delayedExecutionField() {
-    return PUTSTATIC.and(isAUtilFunctionField());
+  StaticInitializerInterceptor(Set<String> delayedExecutionTypes) {
+    this.delayedExecutionTypes = delayedExecutionTypes;
+  }
+
+  private static Match<AbstractInsnNode> delayedExecutionField(SlotRead<Set<String>> delayedFields) {
+    return PUTSTATIC.and(isADelayedExecutionField(delayedFields));
   }
 
-  private static Match<AbstractInsnNode> isAUtilFunctionField() {
+  private static Match<AbstractInsnNode> isADelayedExecutionField(SlotRead<Set<String>> delayedFields) {
     return (c,n) -> {
       FieldInsnNode fieldNode = ((FieldInsnNode) n);
-      return result( fieldNode.desc.startsWith("Ljava/util/function/"), c);
+      return result( c.retrieve(delayedFields).get().contains(fieldNode.name), c);
     };
   }
 
-  private static Match<AbstractInsnNode> dynamicallyReturnsDeferredExecutionCode() {
-    return (c,n) -> result(n.getOpcode() == Opcodes.INVOKEDYNAMIC && returnDelayedExecutionType(((InvokeDynamicInsnNode) n).desc), c);
+  private Match<AbstractInsnNode> dynamicallyReturnsDeferredExecutionCode() {
+    return (c,n) -> result(n.getOpcode() == Opcodes.INVOKEDYNAMIC && returnsDelayedExecutionType(((InvokeDynamicInsnNode) n).desc), c);
   }
 
-  private static Match<AbstractInsnNode> returnsDeferredExecutionCode() {
-    return (c,n) -> result(n.getOpcode() == Opcodes.INVOKESTATIC && returnDelayedExecutionType(((MethodInsnNode) n).desc), c);
+  private Match<AbstractInsnNode> returnsDeferredExecutionCode() {
+    return (c,n) -> result(n.getOpcode() == Opcodes.INVOKESTATIC && returnsDelayedExecutionType(((MethodInsnNode) n).desc), c);
+  }
+
+  private boolean returnsDelayedExecutionType(String desc) {
+    Type returnType = Type.getReturnType(desc);
+    // fixme Arrays?
+    if (returnType.getSort() != Type.OBJECT) {
+      return false;
+    }
+
+    return isADelayedExecutionType(returnType.getInternalName());
   }
 
-  private static boolean returnDelayedExecutionType(String desc) {
-    int endOfParams = desc.indexOf(')');
-    return endOfParams <= 0 || desc.substring(endOfParams + 1).startsWith("Ljava/util/function/");
+
+  private boolean isADelayedExecutionType(String type) {
+    return delayedExecutionTypes.contains(type);
   }
 
   private static SequenceQuery<AbstractInsnNode> enumConstructorCallAndStore() {
@@ -126,14 +146,23 @@ private void analyseClass(ClassTree tree) {
     final Optional<MethodTree> clinit = tree.methods().stream().filter(nameEquals("<clinit>")).findFirst();
 
     if (clinit.isPresent()) {
+
+      // Find delayed execution fields (Function, Supplier, List<Supplier> etc). Full generic signature is available in the
+      // declaration, but not on call.
+      Set<String> delayedExecutionFields = tree.rawNode().fields.stream()
+              .filter(this::isDelayedExecutionField)
+              .map(n -> n.name)
+              .collect(Collectors.toSet());
+
+
       // We can't see if a method *call* is private from the call site
       // so collect a set of private methods within the class first
       Set<Location> privateMethods = tree.methods().stream()
               .filter(MethodTree::isPrivate)
               .map(MethodTree::asLocation)
               .collect(Collectors.toSet());
 
-      Set<Call> storedToSupplier = findCallsStoredToDelayedExecutionCode(tree);
+      Set<Call> storedToSupplier = findCallsStoredToDelayedExecutionCode(tree, delayedExecutionFields);
 
       // Get map of each private method to the private methods it calls
       // Any call to a non private method breaks the chain
@@ -153,21 +182,26 @@ private void analyseClass(ClassTree tree) {
     }
   }
 
-  private Set<Call> findCallsStoredToDelayedExecutionCode(ClassTree tree) {
-     return new HashSet<>(privateAndClinitCallsToDelayedExecutionCode(tree));
+  private boolean isDelayedExecutionField(FieldNode fieldNode) {
+    return SignatureParser.extractTypes(fieldNode.signature).stream()
+                    .anyMatch(this::isADelayedExecutionType);
+  }
+
+  private Set<Call> findCallsStoredToDelayedExecutionCode(ClassTree tree, Set<String> delayedExecutionFields) {
+     return new HashSet<>(privateAndClinitCallsToDelayedExecutionCode(tree, delayedExecutionFields));
   }
 
 
-  private Set<Call> privateAndClinitCallsToDelayedExecutionCode(ClassTree tree) {
+  private Set<Call> privateAndClinitCallsToDelayedExecutionCode(ClassTree tree, Set<String> delayedExecutionFields) {
     return tree.methods().stream()
             .filter(m -> m.isPrivate() || m.rawNode().name.equals("<clinit>"))
-            .flatMap(m -> delayedExecutionCall(m).stream().map(c -> new Call(m.asLocation(), c)))
+            .flatMap(m -> delayedExecutionCall(m, delayedExecutionFields).stream().map(c -> new Call(m.asLocation(), c)))
             .collect(Collectors.toSet());
   }
 
-  private List<Location> delayedExecutionCall(MethodTree method) {
-    Context context = Context.start();
-    return DELAYED_EXECUTION.contextMatches(method.instructions(), context).stream()
+  private List<Location> delayedExecutionCall(MethodTree method, Set<String> delayedExecutionFields) {
+    Context context = Context.start().store(DELAYED_EXECUTION_FIELDS.write(), delayedExecutionFields);
+    return delayedExecution.contextMatches(method.instructions(), context).stream()
             .map(c -> c.retrieve(START.read()).get())
             .flatMap(this::nodeToLocation)
             .collect(Collectors.toList());

pitest-entry/src/main/java/org/pitest/mutationtest/build/intercept/staticinitializers/StaticInitializerInterceptorFactory.java

@@ -5,22 +5,42 @@
 import org.pitest.mutationtest.build.MutationInterceptorFactory;
 import org.pitest.plugin.Feature;
 
+import java.io.BufferedReader;
+import java.io.IOException;
+import java.io.InputStreamReader;
+import java.util.HashSet;
+import java.util.Set;
+
 public class StaticInitializerInterceptorFactory implements MutationInterceptorFactory {
 
-  @Override
-  public String description() {
-    return "Static initializer code detector plugin";
-  }
+    @Override
+    public String description() {
+        return "Static initializer code detector plugin";
+    }
+
+    @Override
+    public MutationInterceptor createInterceptor(InterceptorParameters params) {
+        return new StaticInitializerInterceptor(functionalInterfaces());
+    }
 
-  @Override
-  public MutationInterceptor createInterceptor(InterceptorParameters params) {
-    return new StaticInitializerInterceptor();
-  }
+    @Override
+    public Feature provides() {
+        return Feature.named("FSTATI")
+                .withOnByDefault(true)
+                .withDescription("Filters mutations in static initializers and code called only from them");
+    }
 
-  @Override
-  public Feature provides() {
-    return Feature.named("FSTATI")
-        .withOnByDefault(true)
-        .withDescription("Filters mutations in static initializers and code called only from them");
-  }
+    private Set<String> functionalInterfaces() {
+        Set<String> classes = new HashSet<>();
+        try (BufferedReader r = new BufferedReader(new InputStreamReader(this.getClass().getResourceAsStream("/functional_interfaces.txt")))) {
+            String line = r.readLine();
+            while (line != null) {
+                classes.add(line);
+                line = r.readLine();
+            }
+            return classes;
+        } catch (IOException e) {
+            throw new RuntimeException("Could not read embedded list of functional interfaces!");
+        }
+    }
 }

pitest-entry/src/main/java/org/pitest/mutationtest/tooling/MutationCoverage.java

@@ -65,7 +65,6 @@
 import java.util.Optional;
 import java.util.Set;
 import java.util.function.Predicate;
-import java.util.logging.Level;
 import java.util.logging.Logger;
 import java.util.stream.Collectors;
 
@@ -337,7 +336,7 @@ private List<MutationAnalysisUnit> buildMutationTests(CoverageDatabase coverageD
             coverageData);
 
     final MutationInterceptor interceptor = this.settings.getInterceptor()
-            .createInterceptor(this.data, coverageData, bas, testPrioritiser)
+            .createInterceptor(this.data, coverageData, bas, testPrioritiser, code)
             .filter(interceptorFilter);
 
     interceptor.initialise(this.code);
@@ -377,17 +376,15 @@ private CoverageGenerator coverage() {
     return this.strategies.coverage();
   }
 
-  // For reasons not yet understood classes from rt.jar are not resolved for some
-  // projects during static analysis phase. For now fall back to the classloader when
-  // a class not provided by project classpath
+  // Since java 9 rt.jar is no longer on the classpath so jdk classes will not resolve from
+  // the filesystem and must be pulled out via the classloader
   private ClassByteArraySource fallbackToClassLoader(final ClassByteArraySource bas) {
     final ClassByteArraySource clSource = ClassloaderByteArraySource.fromContext();
     return clazz -> {
       final Optional<byte[]> maybeBytes = bas.getBytes(clazz);
       if (maybeBytes.isPresent()) {
         return maybeBytes;
       }
-      LOG.log(Level.FINE, "Could not find " + clazz + " on classpath for analysis. Falling back to classloader");
       return clSource.getBytes(clazz);
     };
   }

pitest-entry/src/main/java/org/pitest/sequence/Slot.java

@@ -1,6 +1,7 @@
 package org.pitest.sequence;
 
 import java.util.List;
+import java.util.Set;
 
 public final class Slot<T> {
     public static <T> Slot<T> create(Class<T> clazz) {
@@ -11,6 +12,10 @@ public static <T> Slot<List<T>> createList(Class<T> clazz) {
         return new Slot<>();
     }
 
+    public static <T> Slot<Set<T>> createSet(Class<T> clazz) {
+        return new Slot<>();
+    }
+
     public SlotWrite<T> write() {
         return new SlotWrite<>(this);
     }