1 files changed, 140 insertions, 0 deletions
diff --git a/widget/android/jni/Types.h b/widget/android/jni/Types.h
new file mode 100644
index 000000000..a083d3e50
--- /dev/null
+++ b/widget/android/jni/Types.h
@@ -0,0 +1,140 @@
+#ifndef mozilla_jni_Types_h__
+#define mozilla_jni_Types_h__
+
+#include <jni.h>
+
+#include "mozilla/jni/Refs.h"
+
+namespace mozilla {
+namespace jni {
+namespace detail {
+
+// TypeAdapter specializations are the interfaces between native/C++ types such
+// as int32_t and JNI types such as jint. The template parameter T is the native
+// type, and each TypeAdapter specialization can have the following members:
+//
+//  * Call: JNIEnv member pointer for making a method call that returns T.
+//  * StaticCall: JNIEnv member pointer for making a static call that returns T.
+//  * Get: JNIEnv member pointer for getting a field of type T.
+//  * StaticGet: JNIEnv member pointer for getting a static field of type T.
+//  * Set: JNIEnv member pointer for setting a field of type T.
+//  * StaticGet: JNIEnv member pointer for setting a static field of type T.
+//  * ToNative: static function that converts the JNI type to the native type.
+//  * FromNative: static function that converts the native type to the JNI type.
+
+template<typename T> struct TypeAdapter;
+
+
+// TypeAdapter<LocalRef<Cls>> applies when jobject is a return value.
+template<class Cls> struct TypeAdapter<LocalRef<Cls>> {
+    using JNIType = typename Cls::Ref::JNIType;
+
+    static constexpr auto Call = &JNIEnv::CallObjectMethodA;
+    static constexpr auto StaticCall = &JNIEnv::CallStaticObjectMethodA;
+    static constexpr auto Get = &JNIEnv::GetObjectField;
+    static constexpr auto StaticGet = &JNIEnv::GetStaticObjectField;
+
+    // Declare instance as jobject because JNI methods return
+    // jobject even if the return value is really jstring, etc.
+    static LocalRef<Cls> ToNative(JNIEnv* env, jobject instance) {
+        return LocalRef<Cls>::Adopt(env, JNIType(instance));
+    }
+
+    static JNIType FromNative(JNIEnv*, LocalRef<Cls>&& instance) {
+        return instance.Forget();
+    }
+};
+
+// clang is picky about function types, including attributes that modify the calling
+// convention, lining up.  GCC appears to be somewhat less so.
+#ifdef __clang__
+#define MOZ_JNICALL_ABI JNICALL
+#else
+#define MOZ_JNICALL_ABI
+#endif
+
+template<class Cls> constexpr jobject
+    (JNIEnv::*TypeAdapter<LocalRef<Cls>>::Call)(jobject, jmethodID, jvalue*) MOZ_JNICALL_ABI;
+template<class Cls> constexpr jobject
+    (JNIEnv::*TypeAdapter<LocalRef<Cls>>::StaticCall)(jclass, jmethodID, jvalue*) MOZ_JNICALL_ABI;
+template<class Cls> constexpr jobject
+    (JNIEnv::*TypeAdapter<LocalRef<Cls>>::Get)(jobject, jfieldID);
+template<class Cls> constexpr jobject
+    (JNIEnv::*TypeAdapter<LocalRef<Cls>>::StaticGet)(jclass, jfieldID);
+
+
+// TypeAdapter<Ref<Cls>> applies when jobject is a parameter value.
+template<class Cls, typename T> struct TypeAdapter<Ref<Cls, T>> {
+    using JNIType = typename Ref<Cls, T>::JNIType;
+
+    static constexpr auto Set = &JNIEnv::SetObjectField;
+    static constexpr auto StaticSet = &JNIEnv::SetStaticObjectField;
+
+    static DependentRef<Cls> ToNative(JNIEnv* env, JNIType instance) {
+        return DependentRef<Cls>(instance);
+    }
+
+    static JNIType FromNative(JNIEnv*, const Ref<Cls, T>& instance) {
+        return instance.Get();
+    }
+};
+
+template<class Cls, typename T> constexpr void
+    (JNIEnv::*TypeAdapter<Ref<Cls, T>>::Set)(jobject, jfieldID, jobject);
+template<class Cls, typename T> constexpr void
+    (JNIEnv::*TypeAdapter<Ref<Cls, T>>::StaticSet)(jclass, jfieldID, jobject);
+
+
+// jstring has its own Param type.
+template<> struct TypeAdapter<StringParam>
+        : public TypeAdapter<String::Ref>
+{};
+
+template<class Cls> struct TypeAdapter<const Cls&>
+        : public TypeAdapter<Cls>
+{};
+
+
+#define DEFINE_PRIMITIVE_TYPE_ADAPTER(NativeType, JNIType, JNIName) \
+    \
+    template<> struct TypeAdapter<NativeType> { \
+        using JNI##Type = JNIType; \
+    \
+        static constexpr auto Call = &JNIEnv::Call ## JNIName ## MethodA; \
+        static constexpr auto StaticCall = &JNIEnv::CallStatic ## JNIName ## MethodA; \
+        static constexpr auto Get = &JNIEnv::Get ## JNIName ## Field; \
+        static constexpr auto StaticGet = &JNIEnv::GetStatic ## JNIName ## Field; \
+        static constexpr auto Set = &JNIEnv::Set ## JNIName ## Field; \
+        static constexpr auto StaticSet = &JNIEnv::SetStatic ## JNIName ## Field; \
+        static constexpr auto GetArray = &JNIEnv::Get ## JNIName ## ArrayRegion; \
+        static constexpr auto SetArray = &JNIEnv::Set ## JNIName ## ArrayRegion; \
+        static constexpr auto NewArray = &JNIEnv::New ## JNIName ## Array; \
+    \
+        static JNIType FromNative(JNIEnv*, NativeType val) { \
+            return static_cast<JNIType>(val); \
+        } \
+        static NativeType ToNative(JNIEnv*, JNIType val) { \
+            return static_cast<NativeType>(val); \
+        } \
+    }
+
+
+DEFINE_PRIMITIVE_TYPE_ADAPTER(bool,     jboolean, Boolean);
+DEFINE_PRIMITIVE_TYPE_ADAPTER(int8_t,   jbyte,    Byte);
+DEFINE_PRIMITIVE_TYPE_ADAPTER(char16_t, jchar,    Char);
+DEFINE_PRIMITIVE_TYPE_ADAPTER(int16_t,  jshort,   Short);
+DEFINE_PRIMITIVE_TYPE_ADAPTER(int32_t,  jint,     Int);
+DEFINE_PRIMITIVE_TYPE_ADAPTER(int64_t,  jlong,    Long);
+DEFINE_PRIMITIVE_TYPE_ADAPTER(float,    jfloat,   Float);
+DEFINE_PRIMITIVE_TYPE_ADAPTER(double,   jdouble,  Double);
+
+#undef DEFINE_PRIMITIVE_TYPE_ADAPTER
+
+} // namespace detail
+
+using namespace detail;
+
+} // namespace jni
+} // namespace mozilla
+
+#endif // mozilla_jni_Types_h__