[java-decompiler] synthetic inner class constructor parameter filtering (IDEA-147606)

src/org/jetbrains/java/decompiler/main/rels/NestedClassProcessor.java

@@ -65,9 +65,9 @@ public class NestedClassProcessor {
 
     int nameless = 0, synthetics = 0;
     for (ClassNode child : node.nested) {
+      StructClass cl = child.classStruct;
       // ensure not-empty class name
       if ((child.type == ClassNode.CLASS_LOCAL || child.type == ClassNode.CLASS_MEMBER) && child.simpleName == null) {
-        StructClass cl = child.classStruct;
         if ((child.access & CodeConstants.ACC_SYNTHETIC) != 0 || cl.isSynthetic()) {
           child.simpleName = "SyntheticClass_" + (++synthetics);
         }
@@ -78,6 +78,9 @@ public class NestedClassProcessor {
         }
         child.namelessConstructorStub = !cl.hasModifier(CodeConstants.ACC_STATIC) && cl.getMethods().size() + cl.getFields().size() == 0;
       }
+      else if (child.type == ClassNode.CLASS_ANONYMOUS && (child.access & CodeConstants.ACC_SYNTHETIC) != 0 || cl.isSynthetic()) {
+        child.namelessConstructorStub = !cl.hasModifier(CodeConstants.ACC_STATIC) && cl.getMethods().size() + cl.getFields().size() == 0;
+      }
     }
 
     for (ClassNode child : node.nested) {
@@ -180,10 +183,14 @@ public class NestedClassProcessor {
     List<ClassNode> copy = new ArrayList<ClassNode>(node.nested);
 
     for (ClassNode child : copy) {
+      if (child.classStruct.hasModifier(CodeConstants.ACC_SYNTHETIC)) {
+        continue;
+      }
+
       if ((child.type == ClassNode.CLASS_LOCAL || child.type == ClassNode.CLASS_ANONYMOUS) && child.enclosingMethod == null) {
         Set<String> setEnclosing = child.enclosingClasses;
 
-        if (setEnclosing.size() == 1) {
+        if (!setEnclosing.isEmpty()) {
           StructEnclosingMethodAttribute attr =
             (StructEnclosingMethodAttribute)child.classStruct.getAttributes().getWithKey("EnclosingMethod");
           if (attr != null &&
@@ -199,17 +206,12 @@ public class NestedClassProcessor {
         child.parent = null;
         setEnclosing.remove(node.classStruct.qualifiedName);
 
-        boolean hasEnclosing = !setEnclosing.isEmpty();
-        if (hasEnclosing) {
-          hasEnclosing = insertNestedClass(root, child);
-        }
+        boolean hasEnclosing = !setEnclosing.isEmpty() && insertNestedClass(root, child);
 
         if (!hasEnclosing) {
           if (child.type == ClassNode.CLASS_ANONYMOUS) {
-            if (!child.classStruct.hasModifier(CodeConstants.ACC_SYNTHETIC)) {
-              String message = "Unreferenced anonymous class " + child.classStruct.qualifiedName + "!";
-              DecompilerContext.getLogger().writeMessage(message, IFernflowerLogger.Severity.WARN);
-            }
+            String message = "Unreferenced anonymous class " + child.classStruct.qualifiedName + "!";
+            DecompilerContext.getLogger().writeMessage(message, IFernflowerLogger.Severity.WARN);
           }
           else if (child.type == ClassNode.CLASS_LOCAL) {
             String message = "Unreferenced local class " + child.classStruct.qualifiedName + "!";
@@ -251,6 +253,10 @@ public class NestedClassProcessor {
     int clTypes = 0;
 
     for (ClassNode nd : node.nested) {
+      if (nd.classStruct.hasModifier(CodeConstants.ACC_SYNTHETIC)) {
+        continue;
+      }
+
       if (nd.type != ClassNode.CLASS_LAMBDA &&
           (nd.access & CodeConstants.ACC_STATIC) == 0 &&
           (nd.access & CodeConstants.ACC_INTERFACE) == 0) {
@@ -258,10 +264,8 @@ public class NestedClassProcessor {
 
         Map<String, List<VarFieldPair>> mask = getMaskLocalVars(nd.getWrapper());
         if (mask.isEmpty()) {
-          if (!nd.classStruct.hasModifier(CodeConstants.ACC_SYNTHETIC)) {
-            String message = "Nested class " + nd.classStruct.qualifiedName + " has no constructor!";
-            DecompilerContext.getLogger().writeMessage(message, IFernflowerLogger.Severity.WARN);
-          }
+          String message = "Nested class " + nd.classStruct.qualifiedName + " has no constructor!";
+          DecompilerContext.getLogger().writeMessage(message, IFernflowerLogger.Severity.WARN);
         }
         else {
           mapVarMasks.put(nd.classStruct.qualifiedName, mask);

testData/results/TestInnerClassConstructor.dec

@@ -1,40 +1,65 @@
 package pkg;
 
 class TestInnerClassConstructor {
-   void m() {
+   void l() {
       new TestInnerClassConstructor.Inner("text");// 5
    }// 6
 
-   void n(String var1) {
-      System.out.println("n(): " + var1);// 9
+   void m() {
+      new TestInnerClassConstructor.Another(3, 4);// 9
    }// 10
 
+   void n(String var1) {
+      System.out.println("n(): " + var1);// 13
+   }// 14
+
+   private class Another {
+      private Another(int var2, int var3) {
+         TestInnerClassConstructor.this.n(var2 + "+" + var3);// 24
+      }// 25
+   }
+
    final class Inner {
       private Inner(String var2) {
-         TestInnerClassConstructor.this.n(var2);// 14
-      }// 15
+         TestInnerClassConstructor.this.n(var2);// 18
+      }// 19
    }
 }
 
 class 'pkg/TestInnerClassConstructor' {
-   method 'm ()V' {
+   method 'l ()V' {
       5      4
       c      5
    }
 
+   method 'm ()V' {
+      5      8
+      6      8
+      c      9
+   }
+
    method 'n (Ljava/lang/String;)V' {
-      0      8
-      a      8
-      13      8
-      16      8
-      19      9
+      0      12
+      a      12
+      13      12
+      16      12
+      19      13
+   }
+}
+
+class 'pkg/TestInnerClassConstructor$Another' {
+   method '<init> (Lpkg/TestInnerClassConstructor;II)V' {
+      15      17
+      1e      17
+      21      17
+      24      18
    }
 }
 
 class 'pkg/TestInnerClassConstructor$Inner' {
    method '<init> (Lpkg/TestInnerClassConstructor;Ljava/lang/String;)V' {
-      b      13
-      e      14
+      b      23
+      e      24
    }
 }
 
@@ -43,7 +68,12 @@ Lines mapping:
 6 <-> 6
 9 <-> 9
 10 <-> 10
+13 <-> 13
 14 <-> 14
-15 <-> 15
+18 <-> 24
+19 <-> 25
+24 <-> 18
+25 <-> 19
 Not mapped:
-13
+17
+23

testData/src/pkg/TestInnerClassConstructor.java

@@ -1,10 +1,14 @@
 package pkg;
 
 class TestInnerClassConstructor {
-  void m() {
+  void l() {
     new Inner("text");
   }
 
+  void m() {
+    new Another(3, 4);
+  }
+
   void n(String s) {
     System.out.println("n(): " + s);
   }
@@ -14,4 +18,10 @@ class TestInnerClassConstructor {
       n(s);
     }
   }
+
+  private class Another {
+    private Another(int a, int b) {
+      n(a + "+" + b);
+    }
+  }
 }