implement JNI reflection methods

These include FromReflectedMethod, ToReflectedMethod, FromReflectedField, and ToReflectedField.
2025-03-17 17:45:17 +00:00 · 2012-12-19 12:39:33 -07:00 · 2012-12-19 12:39:33 -07:00 · d200019d10
commit d200019d10
parent 7b07b5b9a3
6 changed files with 476 additions and 145 deletions
--- a/src/classpath-avian.cpp
+++ b/src/classpath-avian.cpp
@ -54,6 +54,37 @@ class MyClasspath : public Classpath {
       root(t, Machine::BootLoader), 0, 0, group, 0);
  }

+  virtual object
+  makeJMethod(Thread* t, object vmMethod)
+  {
+    PROTECT(t, vmMethod);
+
+    object jmethod = makeJmethod(t, vmMethod, false);
+
+    return byteArrayBody(t, methodName(t, vmMethod), 0) == '<'
+      ? makeJconstructor(t, jmethod) : jmethod;
+  }
+
+  virtual object
+  getVMMethod(Thread* t, object jmethod)
+  {
+    return objectClass(t, jmethod) == type(t, Machine::JmethodType)
+      ? jmethodVmMethod(t, jmethod)
+      : jmethodVmMethod(t, jconstructorMethod(t, jmethod));
+  }
+
+  virtual object
+  makeJField(Thread* t, object vmField)
+  {
+    return makeJfield(t, vmField, false);
+  }
+
+  virtual object
+  getVMField(Thread* t, object jfield)
+  {
+    return jfieldVmField(t, jfield);
+  }
+
  virtual void
  clearInterrupted(Thread*)
  {
--- a/src/classpath-openjdk.cpp
+++ b/src/classpath-openjdk.cpp
@ -341,6 +341,15 @@ makeClassNameString(Thread* t, object name)
  return makeString(t, "%s", s);
 }

+object
+makeJmethod(Thread* t, object vmMethod, int index = -1);
+
+object
+makeJconstructor(Thread* t, object vmMethod, int index = -1);
+
+object
+makeJfield(Thread* t, object vmField, int index = -1);
+
 void
 interceptFileOperations(Thread*);

@ -537,6 +546,44 @@ class MyClasspath : public Classpath {
    return thread;
  }

+  virtual object
+  makeJMethod(Thread* t, object vmMethod)
+  {
+    PROTECT(t, vmMethod);
+
+    return byteArrayBody(t, methodName(t, vmMethod), 0) == '<'
+      ? makeJconstructor(t, vmMethod)
+      : makeJmethod(t, vmMethod);
+  }
+
+  virtual object
+  getVMMethod(Thread* t, object jmethod)
+  {
+    return objectClass(t, jmethod) == type(t, Machine::JmethodType)
+      ? arrayBody
+      (t, classMethodTable
+       (t, jclassVmClass(t, jmethodClazz(t, jmethod))),
+       jmethodSlot(t, jmethod))
+      : arrayBody
+      (t, classMethodTable
+       (t, jclassVmClass(t, jconstructorClazz(t, jmethod))),
+       jconstructorSlot(t, jmethod));
+  }
+
+  virtual object
+  makeJField(Thread* t, object vmField)
+  {
+    return makeJfield(t, vmField);
+  }
+
+  virtual object
+  getVMField(Thread* t, object jfield)
+  {
+    return arrayBody
+      (t, classFieldTable
+       (t, jclassVmClass(t, jfieldClazz(t, jfield))), jfieldSlot(t, jfield));
+  }
+
  virtual void
  clearInterrupted(Thread* t)
  {
@ -2260,6 +2307,213 @@ resolveExceptionJTypes(Thread* t, object loader, object addendum)
  return array;
 }

+object
+makeJmethod(Thread* t, object vmMethod, int index)
+{
+  PROTECT(t, vmMethod);
+
+  object name = intern
+    (t, t->m->classpath->makeString
+     (t, methodName(t, vmMethod), 0, byteArrayLength
+      (t, methodName(t, vmMethod)) - 1));
+  PROTECT(t, name);
+
+  unsigned parameterCount;
+  unsigned returnTypeSpec;
+  object parameterTypes = local::resolveParameterJTypes
+    (t, classLoader(t, methodClass(t, vmMethod)), methodSpec(t, vmMethod),
+     &parameterCount, &returnTypeSpec);
+  PROTECT(t, parameterTypes);
+
+  object returnType = local::resolveJType
+    (t, classLoader(t, methodClass(t, vmMethod)), reinterpret_cast<char*>
+     (&byteArrayBody(t, methodSpec(t, vmMethod), returnTypeSpec)),
+     byteArrayLength(t, methodSpec(t, vmMethod)) - 1 - returnTypeSpec);
+  PROTECT(t, returnType);
+
+  object exceptionTypes = local::resolveExceptionJTypes
+    (t, classLoader(t, methodClass(t, vmMethod)),
+     methodAddendum(t, vmMethod));
+  PROTECT(t, exceptionTypes);
+
+  object signature;
+  object annotationTable;
+  object annotationDefault;
+  object addendum = methodAddendum(t, vmMethod);
+  if (addendum) {
+    signature = addendumSignature(t, addendum);
+    if (signature) {
+      signature = t->m->classpath->makeString
+        (t, signature, 0, byteArrayLength(t, signature) - 1);
+    }
+
+    annotationTable = addendumAnnotationTable(t, addendum);
+
+    annotationDefault = methodAddendumAnnotationDefault(t, addendum);
+  } else {
+    signature = 0;
+    annotationTable = 0;
+    annotationDefault = 0;
+  }
+
+  PROTECT(t, signature);
+  PROTECT(t, annotationTable);
+  PROTECT(t, annotationDefault);
+
+  if (annotationTable or annotationDefault) {
+    object runtimeData = getClassRuntimeData(t, methodClass(t, vmMethod));
+
+    set(t, runtimeData, ClassRuntimeDataPool,
+        addendumPool(t, methodAddendum(t, vmMethod)));
+  }
+
+  if (index == -1) {
+    object table = classMethodTable(t, methodClass(t, vmMethod));
+    for (unsigned i = 0; i < arrayLength(t, table); ++i) {
+      if (vmMethod == arrayBody(t, table, i)) {
+        index = i;
+        break;
+      }
+    }
+  }
+
+  expect(t, index != -1);
+
+  object jclass = getJClass(t, methodClass(t, vmMethod));
+
+  return makeJmethod
+    (t, true, 0, jclass, index, name, returnType, parameterTypes,
+     exceptionTypes, methodFlags(t, vmMethod), signature, 0, annotationTable,
+     0, annotationDefault, 0, 0, 0);
+}
+
+object
+makeJconstructor(Thread* t, object vmMethod, int index)
+{
+  PROTECT(t, vmMethod);
+
+  unsigned parameterCount;
+  unsigned returnTypeSpec;
+  object parameterTypes = local::resolveParameterJTypes
+    (t, classLoader(t, methodClass(t, vmMethod)), methodSpec(t, vmMethod),
+     &parameterCount, &returnTypeSpec);
+  PROTECT(t, parameterTypes);
+
+  object exceptionTypes = local::resolveExceptionJTypes
+    (t, classLoader(t, methodClass(t, vmMethod)),
+     methodAddendum(t, vmMethod));
+  PROTECT(t, exceptionTypes);
+
+  object signature;
+  object annotationTable;
+  object addendum = methodAddendum(t, vmMethod);
+  if (addendum) {
+    signature = addendumSignature(t, addendum);
+    if (signature) {
+      signature = t->m->classpath->makeString
+        (t, signature, 0, byteArrayLength(t, signature) - 1);
+    }
+
+    annotationTable = addendumAnnotationTable(t, addendum);
+  } else {
+    signature = 0;
+    annotationTable = 0;
+  }
+
+  PROTECT(t, signature);
+  PROTECT(t, annotationTable);
+
+  if (annotationTable) {
+    object runtimeData = getClassRuntimeData(t, methodClass(t, vmMethod));
+
+    set(t, runtimeData, ClassRuntimeDataPool,
+        addendumPool(t, methodAddendum(t, vmMethod)));
+  }
+
+  if (index == -1) {
+    object table = classMethodTable(t, methodClass(t, vmMethod));
+    for (unsigned i = 0; i < arrayLength(t, table); ++i) {
+      if (vmMethod == arrayBody(t, table, i)) {
+        index = i;
+        break;
+      }
+    }
+  }
+
+  expect(t, index != -1);
+
+  object jclass = getJClass(t, methodClass(t, vmMethod));
+
+  return makeJconstructor
+    (t, true, 0, jclass, index, parameterTypes, exceptionTypes, methodFlags
+     (t, vmMethod), signature, 0, annotationTable, 0, 0, 0, 0);
+}
+
+object
+makeJfield(Thread* t, object vmField, int index)
+{
+  PROTECT(t, vmField);
+
+  object name = intern
+    (t, t->m->classpath->makeString
+     (t, fieldName(t, vmField), 0, byteArrayLength
+      (t, fieldName(t, vmField)) - 1));
+  PROTECT(t, name);
+
+  object type = local::resolveClassBySpec
+    (t, classLoader(t, fieldClass(t, vmField)),
+     reinterpret_cast<char*>
+     (&byteArrayBody(t, fieldSpec(t, vmField), 0)),
+     byteArrayLength(t, fieldSpec(t, vmField)) - 1);
+  PROTECT(t, type);
+
+  type = getJClass(t, type);
+
+  object signature;
+  object annotationTable;
+  object addendum = fieldAddendum(t, vmField);
+  if (addendum) {
+    signature = addendumSignature(t, addendum);
+    if (signature) {
+      signature = t->m->classpath->makeString
+        (t, signature, 0, byteArrayLength(t, signature) - 1);
+    }
+
+    annotationTable = addendumAnnotationTable(t, addendum);
+  } else {
+    signature = 0;
+    annotationTable = 0;
+  }
+
+  PROTECT(t, signature);
+  PROTECT(t, annotationTable);
+
+  if (annotationTable) {
+    object runtimeData = getClassRuntimeData(t, fieldClass(t, vmField));
+
+    set(t, runtimeData, ClassRuntimeDataPool,
+        addendumPool(t, fieldAddendum(t, vmField)));
+  }
+
+  if (index == -1) {
+    object table = classFieldTable(t, fieldClass(t, vmField));
+    for (unsigned i = 0; i < arrayLength(t, table); ++i) {
+      if (vmField == arrayBody(t, table, i)) {
+        index = i;
+        break;
+      }
+    }
+  }
+
+  expect(t, index != -1);
+
+  object jclass = getJClass(t, fieldClass(t, vmField));
+
+  return makeJfield
+    (t, true, 0, jclass, index, name, type, fieldFlags
+     (t, vmField), signature, 0, annotationTable, 0, 0, 0, 0);
+}
+
 void
 setProperty(Thread* t, object method, object properties,
            const char* name, const void* value, const char* format = "%s")
@ -4380,65 +4634,7 @@ jvmGetClassDeclaredMethods(Thread* t, uintptr_t* arguments)
      if (((not publicOnly) or (methodFlags(t, vmMethod) & ACC_PUBLIC))
          and byteArrayBody(t, methodName(t, vmMethod), 0) != '<')
      {
-        object name = intern
-          (t, t->m->classpath->makeString
-           (t, methodName(t, vmMethod), 0, byteArrayLength
-            (t, methodName(t, vmMethod)) - 1));
-        PROTECT(t, name);
-
-        unsigned parameterCount;
-        unsigned returnTypeSpec;
-        object parameterTypes = local::resolveParameterJTypes
-          (t, classLoader(t, jclassVmClass(t, *c)), methodSpec(t, vmMethod),
-           &parameterCount, &returnTypeSpec);
-        PROTECT(t, parameterTypes);
-
-        object returnType = local::resolveJType
-          (t, classLoader(t, jclassVmClass(t, *c)), reinterpret_cast<char*>
-           (&byteArrayBody(t, methodSpec(t, vmMethod), returnTypeSpec)),
-           byteArrayLength(t, methodSpec(t, vmMethod)) - 1 - returnTypeSpec);
-        PROTECT(t, returnType);
-
-        object exceptionTypes = local::resolveExceptionJTypes
-          (t, classLoader(t, jclassVmClass(t, *c)),
-           methodAddendum(t, vmMethod));
-        PROTECT(t, exceptionTypes);
-
-        object signature;
-        object annotationTable;
-        object annotationDefault;
-        object addendum = methodAddendum(t, vmMethod);
-        if (addendum) {
-          signature = addendumSignature(t, addendum);
-          if (signature) {
-            signature = t->m->classpath->makeString
-              (t, signature, 0, byteArrayLength(t, signature) - 1);
-          }
-
-          annotationTable = addendumAnnotationTable(t, addendum);
-
-          annotationDefault = methodAddendumAnnotationDefault(t, addendum);
-        } else {
-          signature = 0;
-          annotationTable = 0;
-          annotationDefault = 0;
-        }
-
-        if (annotationTable or annotationDefault) {
-          PROTECT(t, signature);
-          PROTECT(t, annotationTable);
-          PROTECT(t, annotationDefault);
-
-          object runtimeData = getClassRuntimeData(t, jclassVmClass(t, *c));
-
-          set(t, runtimeData, ClassRuntimeDataPool,
-              addendumPool(t, methodAddendum(t, vmMethod)));
-        }
-
-        object method = makeJmethod
-          (t, true, 0, *c, i, name, returnType, parameterTypes, exceptionTypes,
-           methodFlags(t, vmMethod), signature, 0, annotationTable, 0,
-           annotationDefault, 0, 0, 0);
+        object method = makeJmethod(t, vmMethod, i);

        assert(t, ai < objectArrayLength(t, array));

@ -4483,50 +4679,7 @@ jvmGetClassDeclaredFields(Thread* t, uintptr_t* arguments)
      PROTECT(t, vmField);

      if ((not publicOnly) or (fieldFlags(t, vmField) & ACC_PUBLIC)) {
-        object name = intern
-          (t, t->m->classpath->makeString
-           (t, fieldName(t, vmField), 0, byteArrayLength
-            (t, fieldName(t, vmField)) - 1));
-        PROTECT(t, name);
-
-        object type = local::resolveClassBySpec
-          (t, classLoader(t, jclassVmClass(t, *c)),
-           reinterpret_cast<char*>
-           (&byteArrayBody(t, fieldSpec(t, vmField), 0)),
-           byteArrayLength(t, fieldSpec(t, vmField)) - 1);
-        PROTECT(t, type);
-
-        type = getJClass(t, type);
-
-        object signature;
-        object annotationTable;
-        object addendum = fieldAddendum(t, vmField);
-        if (addendum) {
-          signature = addendumSignature(t, addendum);
-          if (signature) {
-            signature = t->m->classpath->makeString
-              (t, signature, 0, byteArrayLength(t, signature) - 1);
-          }
-
-          annotationTable = addendumAnnotationTable(t, addendum);
-        } else {
-          signature = 0;
-          annotationTable = 0;
-        }
-
-        if (annotationTable) {
-          PROTECT(t, signature);
-          PROTECT(t, annotationTable);
-
-          object runtimeData = getClassRuntimeData(t, jclassVmClass(t, *c));
-
-          set(t, runtimeData, ClassRuntimeDataPool,
-              addendumPool(t, fieldAddendum(t, vmField)));
-        }
-
-        object field = makeJfield
-          (t, true, 0, *c, i, name, type, fieldFlags
-           (t, vmField), signature, 0, annotationTable, 0, 0, 0, 0);
+        object field = makeJfield(t, vmField, i);

        assert(t, ai < objectArrayLength(t, array));

@ -4577,47 +4730,7 @@ jvmGetClassDeclaredConstructors(Thread* t, uintptr_t* arguments)
                     (&byteArrayBody(t, methodName(t, vmMethod), 0)),
                     "<init>") == 0)
      {
-        unsigned parameterCount;
-        unsigned returnTypeSpec;
-        object parameterTypes = local::resolveParameterJTypes
-          (t, classLoader(t, jclassVmClass(t, *c)), methodSpec(t, vmMethod),
-           &parameterCount, &returnTypeSpec);
-        PROTECT(t, parameterTypes);
-
-        object exceptionTypes = local::resolveExceptionJTypes
-          (t, classLoader(t, jclassVmClass(t, *c)),
-           methodAddendum(t, vmMethod));
-        PROTECT(t, exceptionTypes);
-
-        object signature;
-        object annotationTable;
-        object addendum = methodAddendum(t, vmMethod);
-        if (addendum) {
-          signature = addendumSignature(t, addendum);
-          if (signature) {
-            signature = t->m->classpath->makeString
-              (t, signature, 0, byteArrayLength(t, signature) - 1);
-          }
-
-          annotationTable = addendumAnnotationTable(t, addendum);
-        } else {
-          signature = 0;
-          annotationTable = 0;
-        }
-
-        if (annotationTable) {
-          PROTECT(t, signature);
-          PROTECT(t, annotationTable);
-
-          object runtimeData = getClassRuntimeData(t, jclassVmClass(t, *c));
-
-          set(t, runtimeData, ClassRuntimeDataPool,
-              addendumPool(t, methodAddendum(t, vmMethod)));
-        }
-
-        object method = makeJconstructor
-          (t, true, 0, *c, i, parameterTypes, exceptionTypes, methodFlags
-           (t, vmMethod), signature, 0, annotationTable, 0, 0, 0, 0);
+        object method = makeJconstructor(t, vmMethod, i);

        assert(t, ai < objectArrayLength(t, array));

--- a/src/jnienv.cpp
+++ b/src/jnienv.cpp
@ -3154,6 +3154,82 @@ ReleasePrimitiveArrayCritical(Thread* t, jarray, void*, jint)
  }
 }

+uint64_t
+fromReflectedMethod(Thread* t, uintptr_t* arguments)
+{
+  jobject m = reinterpret_cast<jobject>(arguments[0]);
+
+  return methodID(t, t->m->classpath->getVMMethod(t, *m));
+}
+
+jmethodID JNICALL
+FromReflectedMethod(Thread* t, jobject method)
+{
+  uintptr_t arguments[] = { reinterpret_cast<uintptr_t>(method) };
+
+  return reinterpret_cast<jmethodID>(run(t, fromReflectedMethod, arguments));
+}
+
+uint64_t
+toReflectedMethod(Thread* t, uintptr_t* arguments)
+{
+  jmethodID m = arguments[1];
+  jboolean isStatic = arguments[2];
+
+  return reinterpret_cast<uintptr_t>
+    (makeLocalReference
+     (t, t->m->classpath->makeJMethod
+      (t, isStatic ? getStaticMethod(t, m) : getMethod(t, m))));
+}
+
+jobject JNICALL
+ToReflectedMethod(Thread* t, jclass c, jmethodID method, jboolean isStatic)
+{
+  uintptr_t arguments[] = { reinterpret_cast<uintptr_t>(c),
+                            reinterpret_cast<uintptr_t>(method),
+                            static_cast<uintptr_t>(isStatic) };
+
+  return reinterpret_cast<jobject>(run(t, toReflectedMethod, arguments));
+}
+
+uint64_t
+fromReflectedField(Thread* t, uintptr_t* arguments)
+{
+  jobject f = reinterpret_cast<jobject>(arguments[0]);
+
+  return fieldID(t, t->m->classpath->getVMField(t, *f));
+}
+
+jfieldID JNICALL
+FromReflectedField(Thread* t, jobject field)
+{
+  uintptr_t arguments[] = { reinterpret_cast<uintptr_t>(field) };
+
+  return reinterpret_cast<jfieldID>(run(t, fromReflectedField, arguments));
+}
+
+uint64_t
+toReflectedField(Thread* t, uintptr_t* arguments)
+{
+  jfieldID f = arguments[1];
+  jboolean isStatic = arguments[2];
+
+  return reinterpret_cast<uintptr_t>
+    (makeLocalReference
+     (t, t->m->classpath->makeJField
+      (t, isStatic ? getStaticField(t, f) : getField(t, f))));
+}
+
+jobject JNICALL
+ToReflectedField(Thread* t, jclass c, jfieldID field, jboolean isStatic)
+{
+  uintptr_t arguments[] = { reinterpret_cast<uintptr_t>(c),
+                            reinterpret_cast<uintptr_t>(field),
+                            static_cast<uintptr_t>(isStatic) };
+
+  return reinterpret_cast<jobject>(run(t, toReflectedField, arguments));
+}
+
 uint64_t
 registerNatives(Thread* t, uintptr_t* arguments)
 {
@ -3607,6 +3683,10 @@ populateJNITables(JavaVMVTable* vmTable, JNIEnvVTable* envTable)
  envTable->IsSameObject = local::IsSameObject;
  envTable->PushLocalFrame = local::PushLocalFrame;
  envTable->PopLocalFrame = local::PopLocalFrame;
+  envTable->FromReflectedMethod = local::FromReflectedMethod;
+  envTable->ToReflectedMethod = local::ToReflectedMethod;
+  envTable->FromReflectedField = local::FromReflectedField;
+  envTable->ToReflectedField = local::ToReflectedField;
 }

 } // namespace vm
--- a/src/machine.h
+++ b/src/machine.h
@ -1536,6 +1536,18 @@ class Classpath {
  virtual object
  makeThread(Thread* t, Thread* parent) = 0;

+  virtual object
+  makeJMethod(Thread* t, object vmMethod) = 0;
+
+  virtual object
+  getVMMethod(Thread* t, object jmethod) = 0;
+
+  virtual object
+  makeJField(Thread* t, object vmField) = 0;
+
+  virtual object
+  getVMField(Thread* t, object jfield) = 0;
+
  virtual void
  clearInterrupted(Thread* t) = 0;

--- a/test/JNI.java
+++ b/test/JNI.java
@ -1,3 +1,7 @@
+import java.lang.reflect.Method;
+import java.lang.reflect.Constructor;
+import java.lang.reflect.Field;
+
 public class JNI {
  static {
    System.loadLibrary("test");
@ -37,7 +41,27 @@ public class JNI {
     float a13, float a14, float a15, double a16, float a17, float a18,
     float a19, float a20);

-  public static void main(String[] args) {
+  private static native long fromReflectedMethod(Object m);
+
+  private static native Object toReflectedMethod(Class c, long id,
+                                                 boolean isStatic);
+
+  private static native int callStaticIntMethod(Class c, long id);
+
+  private static native Object newObject(Class c, long id);
+
+  private static native long fromReflectedField(Field f);
+
+  private static native Field toReflectedField(Class c, long id,
+                                               boolean isStatic);
+
+  private static native int getStaticIntField(Class c, long id);
+
+  public static int method242() { return 242; }
+  
+  public static final int field950 = 950;
+
+  public static void main(String[] args) throws Exception {
    expect(addDoubles
           (1.0d, 2.0d, 3.0d, 4.0d, 5.0d, 6.0d, 7.0d, 8.0d, 9.0d, 10.0d, 11.0d,
            12.0d, 13.0d, 14.0d, 15.0d, 16.0d, 17.0d, 18.0d, 19.0d, 20.0d)
@ -55,5 +79,32 @@ public class JNI {

    expect(doEcho(42.0f) == 42.0f);
    expect(doEcho(42.0d) == 42.0d);
+
+    expect(callStaticIntMethod
+           (JNI.class, fromReflectedMethod
+            (JNI.class.getMethod("method242"))) == 242);
+
+    expect(((Method) toReflectedMethod
+            (JNI.class, fromReflectedMethod
+             (JNI.class.getMethod("method242")), true))
+           .getName().equals("method242"));
+
+    expect(newObject
+           (JNI.class, fromReflectedMethod
+            (JNI.class.getConstructor())) instanceof JNI);
+
+    expect(((Constructor) toReflectedMethod
+            (JNI.class, fromReflectedMethod
+             (JNI.class.getConstructor()), false))
+           .getDeclaringClass().equals(JNI.class));
+
+    expect(getStaticIntField
+           (JNI.class, fromReflectedField
+            (JNI.class.getField("field950"))) == 950);
+
+    expect(toReflectedField
+           (JNI.class, fromReflectedField
+            (JNI.class.getField("field950")), true)
+           .getName().equals("field950"));
  }
 }
--- a/test/jni.cpp
+++ b/test/jni.cpp
@ -57,6 +57,50 @@ Java_JNI_doEcho__D(JNIEnv* e, jclass c, jdouble f)
    (c, e->GetStaticMethodID(c, "echo", "(D)D"), array);
 }

+extern "C" JNIEXPORT jlong JNICALL
+Java_JNI_fromReflectedMethod(JNIEnv* e, jclass, jobject method)
+{
+  return reinterpret_cast<uintptr_t>(e->FromReflectedMethod(method));
+}
+
+extern "C" JNIEXPORT jobject JNICALL
+Java_JNI_toReflectedMethod(JNIEnv* e, jclass, jclass c, jlong id,
+                           jboolean isStatic)
+{
+  return e->ToReflectedMethod(c, reinterpret_cast<jmethodID>(id), isStatic);
+}
+
+extern "C" JNIEXPORT jint JNICALL
+Java_JNI_callStaticIntMethod(JNIEnv* e, jclass, jclass c, jlong id)
+{
+  return e->CallStaticIntMethod(c, reinterpret_cast<jmethodID>(id));
+}
+
+extern "C" JNIEXPORT jobject JNICALL
+Java_JNI_newObject(JNIEnv* e, jclass, jclass c, jlong id)
+{
+  return e->NewObject(c, reinterpret_cast<jmethodID>(id));
+}
+
+extern "C" JNIEXPORT jlong JNICALL
+Java_JNI_fromReflectedField(JNIEnv* e, jclass, jobject field)
+{
+  return reinterpret_cast<uintptr_t>(e->FromReflectedField(field));
+}
+
+extern "C" JNIEXPORT jobject JNICALL
+Java_JNI_toReflectedField(JNIEnv* e, jclass, jclass c, jlong id,
+                          jboolean isStatic)
+{
+  return e->ToReflectedField(c, reinterpret_cast<jfieldID>(id), isStatic);
+}
+
+extern "C" JNIEXPORT jint JNICALL
+Java_JNI_getStaticIntField(JNIEnv* e, jclass, jclass c, jlong id)
+{
+  return e->GetStaticIntField(c, reinterpret_cast<jfieldID>(id));
+}
+
 extern "C" JNIEXPORT jobject JNICALL
 Java_Buffers_allocateNative(JNIEnv* e, jclass, jint capacity)
 {