[jnigen] Support nullability annotations on non-types (#1894)

Author: HosseinYousefi

pkgs/jnigen/CHANGELOG.md

@@ -1,6 +1,8 @@
 ## 0.13.1-wip
 
 - Fixed a bug where Kotlin wildcards would crash the code generation.
+- Support nullability annotations that are on Java elements like methods and
+  fields instead of directly on the return type or field type.
 
 ## 0.13.0
 

pkgs/jnigen/example/in_app_java/lib/android_utils.dart

@@ -102,7 +102,8 @@ class Example extends jni$_.JObject {
             reference.pointer,
             _id_thinkBeforeAnswering as jni$_.JMethodIDPtr,
             _$continuation.pointer)
-        .object<jni$_.JObject>(const jni$_.JObjectType());
+        .object<jni$_.JObject>(const jni$_.JObjectType())
+        .release();
     _$continuation.release();
     final $o =
         jni$_.JGlobalReference(jni$_.JObjectPtr.fromAddress(await $p.first));

pkgs/jnigen/example/kotlin_plugin/lib/kotlin_bindings.dart

@@ -22,12 +22,14 @@ protected AsmAnnotationVisitor(JavaAnnotation annotation) {
   @Override
   public void visit(String name, Object value) {
     annotation.properties.put(name, value);
+    super.visit(name, value);
   }
 
   @Override
   public void visitEnum(String name, String descriptor, String value) {
     annotation.properties.put(
         name, new JavaAnnotation.EnumVal(Type.getType(descriptor).getClassName(), value));
+    super.visitEnum(name, descriptor, value);
   }
 
   @Override
@@ -57,12 +59,14 @@ protected AnnotationArrayVisitor(List<Object> list) {
     @Override
     public void visit(String unused, Object value) {
       list.add(value);
+      super.visit(unused, value);
     }
 
     @Override
     public void visitEnum(String unused, String descriptor, String value) {
       var type = Type.getType(descriptor);
       list.add(new JavaAnnotation.EnumVal(type.getClassName(), value));
+      super.visitEnum(unused, descriptor, value);
     }
 
     @Override

pkgs/jnigen/java/src/main/java/com/github/dart_lang/jnigen/apisummarizer/disasm/AsmAnnotationVisitor.java

@@ -23,6 +23,7 @@ public void visitFormalTypeParameter(String name) {
     var typeParam = new TypeParam();
     typeParam.name = name;
     decl.typeParams.add(typeParam);
+    super.visitFormalTypeParameter(name);
   }
 
   @Override

pkgs/jnigen/java/src/main/java/com/github/dart_lang/jnigen/apisummarizer/disasm/AsmClassSignatureVisitor.java

@@ -74,6 +74,7 @@ public void visitInnerClass(String name, String outerName, String innerName, int
       visited.get(binaryName).modifiers = TypeUtils.access(access);
       visited.get(binaryName).outerClassBinaryName = outerClass.get(binaryName);
     }
+    super.visitInnerClass(name, outerName, innerName, access);
   }
 
   @Override
@@ -185,6 +186,7 @@ public AnnotationVisitor visitTypeAnnotation(
   public void visitEnd() {
     var classToAdd = popVisiting();
     visited.put(classToAdd.binaryName, classToAdd);
+    super.visitEnd();
   }
 
   private ClassDecl peekVisiting() {

pkgs/jnigen/java/src/main/java/com/github/dart_lang/jnigen/apisummarizer/disasm/AsmClassVisitor.java

@@ -25,6 +25,7 @@ public void visitFormalTypeParameter(String name) {
     var typeParam = new TypeParam();
     typeParam.name = name;
     method.typeParams.add(typeParam);
+    super.visitFormalTypeParameter(name);
   }
 
   @Override

pkgs/jnigen/java/src/main/java/com/github/dart_lang/jnigen/apisummarizer/disasm/AsmMethodSignatureVisitor.java

@@ -25,6 +25,7 @@ protected AsmMethodVisitor(Method method) {
   @Override
   public void visitParameter(String name, int access) {
     paramNames.add(name);
+    super.visitParameter(name, access);
   }
 
   @Override
@@ -97,5 +98,6 @@ public void visitEnd() {
         method.params.get(i).name = paramNames.get(i);
       }
     }
+    super.visitEnd();
   }
 }

pkgs/jnigen/java/src/main/java/com/github/dart_lang/jnigen/apisummarizer/disasm/AsmMethodVisitor.java

@@ -54,6 +54,7 @@ public void visitBaseType(char descriptor) {
     }
     typeUsage.shorthand = name;
     typeUsage.type = new TypeUsage.PrimitiveType(name);
+    super.visitBaseType(descriptor);
   }
 
   @Override
@@ -70,6 +71,7 @@ public void visitTypeVariable(String name) {
     typeUsage.kind = TypeUsage.Kind.TYPE_VARIABLE;
     typeUsage.shorthand = name;
     typeUsage.type = new TypeUsage.TypeVar(name);
+    super.visitTypeVariable(name);
   }
 
   @Override
@@ -79,13 +81,15 @@ public void visitClassType(String name) {
     var components = name.split("[/$]");
     var simpleName = components[components.length - 1];
     typeUsage.type = new TypeUsage.DeclaredType(typeUsage.shorthand, simpleName, new ArrayList<>());
+    super.visitClassType(name);
   }
 
   @Override
   public void visitTypeArgument() {
     assert (typeUsage.type instanceof TypeUsage.DeclaredType);
     var typeArg = new TypeUsage("?", TypeUsage.Kind.WILDCARD, new TypeUsage.Wildcard(null, null));
     ((TypeUsage.DeclaredType) typeUsage.type).params.add(typeArg);
+    super.visitTypeArgument();
   }
 
   @Override
@@ -125,5 +129,6 @@ public void visitInnerClassType(String name) {
     declaredType.binaryName += "$" + name;
     declaredType.simpleName = name;
     declaredType.typeParamIndices.add(declaredType.params.size());
+    super.visitInnerClassType(name);
   }
 }

pkgs/jnigen/java/src/main/java/com/github/dart_lang/jnigen/apisummarizer/disasm/AsmTypeUsageSignatureVisitor.java

@@ -51,6 +51,7 @@ public void visit(String name, Object value) {
       case "xi":
         extraInt = (int) value;
     }
+    super.visit(name, value);
   }
 
   @Override