jni_signature_alt = mclass_type.jni_signature_alt
return_type = mclass_type
else
- params.add "self"
+ params.add to_java_call_context.cast_to(mclass_type, "self")
if signature.return_mtype != null then
var ret_mtype = signature.return_mtype
ret_mtype = ret_mtype.resolve_for(mclass_type, mclass_type, mmodule, true)
redef fun compile_to_files(mmodule, compdir)
do
+ var ffi_ccu = ffi_ccu
+ assert ffi_ccu != null
+
# Make sure we have a .java file
mmodule.ensure_java_files
mmodule.insert_compiler_options
# Enable linking C callbacks to java native methods
- mmodule.ensure_linking_callback_methods(ffi_ccu.as(not null))
+ mmodule.ensure_linking_callback_methods(ffi_ccu)
+
+ # Function to build instances to the Java class NitObject
+ var callbacks = mmodule.callbacks_used_from_java.callbacks
+ if callbacks.not_empty then
+ var cf = new CFunction("jobject nit_ffi_with_java_new_nit_object(JNIEnv *env, void *data)")
+ cf.exprs.add """
+ // retrieve the current JVM
+ Sys sys = Pointer_sys(NULL);
+
+ jclass java_class = Sys_load_jclass(sys, "nit/app/NitObject");
+ if (java_class == NULL) {
+ PRINT_ERROR("Nit FFI with Java error: failed to load class NitObject.\\n");
+ (*env)->ExceptionDescribe(env);
+ exit(1);
+ }
+
+ jmethodID java_init = (*env)->GetMethodID(env, java_class, "<init>", "(J)V");
+ if (java_init == NULL) {
+ PRINT_ERROR("Nit FFI with Java error: NitObject constructor not found.\\n");
+ (*env)->ExceptionDescribe(env);
+ exit(1);
+ }
+
+ jobject nit_object = (*env)->NewObject(env, java_class, java_init, (jlong)data);
+ if (nit_object == NULL) {
+ PRINT_ERROR("Nit FFI with Java error: NitObject construction failed.\\n");
+ (*env)->ExceptionDescribe(env);
+ exit(1);
+ }
+
+ return nit_object;
+ """
+ ffi_ccu.add_local_function cf
+
+ # Function to extract the pointer held by instances of the Java class NitObject
+ cf = new CFunction("void *nit_ffi_with_java_nit_object_data(JNIEnv *env, jobject nit_object)")
+ cf.exprs.add """
+ Sys sys = Pointer_sys(NULL);
+ jclass java_class = Sys_load_jclass(sys, "nit/app/NitObject");
+ if (java_class == NULL) {
+ PRINT_ERROR("Nit FFI with Java error: failed to load class NitObject.\\n");
+ (*env)->ExceptionDescribe(env);
+ exit(1);
+ }
+
+ jfieldID java_field = (*env)->GetFieldID(env, java_class, "pointer", "J");
+ if (java_field == NULL) {
+ PRINT_ERROR("Nit FFI with Java error: NitObject field not found.\\n");
+ (*env)->ExceptionDescribe(env);
+ exit(1);
+ }
+
+ jlong data = (*env)->GetLongField(env, nit_object, java_field);
+
+ return (void*)data;
+ """
+ ffi_ccu.add_local_function cf
+ end
# Java implementation code
var java_file = mmodule.java_file
redef class MModule
private var callbacks_used_from_java = new ForeignCallbackSet
- # Pure java class source file
- private var java_file: nullable JavaClassTemplate = null
+ # Java source file extracted from user FFI code with generated structure
+ var java_file: nullable JavaClassTemplate = null
# Set up the templates of the Java implementation class
private fun ensure_java_files
fun write_to_files(compdir: String): ExternFile
do
var filename = "{java_class_name}.java"
- var filepath = "{compdir}/{filename}"
+ var filepath = compdir/filename
write_to_file filepath
class JavaFile
super ExternFile
- redef fun makefile_rule_name do return "{filename.basename(".java")}.class"
- redef fun makefile_rule_content do return "javac {filename.basename} -d ."
+ # Full Java class name: package and class
+ fun full_name: String do return filename.basename(".java")
+
+ redef fun makefile_rule_name do return full_name.replace(".", "/") + ".class"
+ redef fun makefile_rule_content do return "javac {filename} -d ."
redef fun add_to_jar do return true
end
private class ToJavaCallContext
super CallContext
- redef fun cast_to(mtype, name) do return "({mtype.jni_type})({name})"
- redef fun cast_from(mtype, name) do return "({mtype.cname})({name})"
+ redef fun cast_to(mtype, name)
+ do
+ if mtype.java_is_nit_object then
+ return "nit_ffi_with_java_new_nit_object(nit_ffi_jni_env, {name})"
+ else
+ return "({mtype.jni_type})({name})"
+ end
+ end
+
+ redef fun cast_from(mtype, name)
+ do
+ if mtype.java_is_nit_object then
+ return "({mtype.cname})nit_ffi_with_java_nit_object_data(nit_ffi_jni_env, {name})"
+ else
+ return "({mtype.cname})({name})"
+ end
+ end
+
redef fun name_mtype(mtype) do return mtype.jni_type
end
private class FromJavaCallContext
super CallContext
- redef fun cast_to(mtype, name) do return "({mtype.cname})({name})"
- redef fun cast_from(mtype, name) do return "({mtype.jni_type})({name})"
+ redef fun cast_to(mtype, name)
+ do
+ if mtype.java_is_nit_object then
+ return "({mtype.cname})nit_ffi_with_java_nit_object_data(nit_ffi_jni_env, {name})"
+ else
+ return "({mtype.cname})({name})"
+ end
+ end
+
+ redef fun cast_from(mtype, name)
+ do
+ if mtype.java_is_nit_object then
+ return "nit_ffi_with_java_new_nit_object(nit_ffi_jni_env, {name})"
+ else
+ return "({mtype.jni_type})({name})"
+ end
+ end
+
redef fun name_mtype(mtype) do return mtype.jni_type
end
#
# * Primitives common to both languages use their Java primitive type
# * Nit extern Java classes are represented by their full Java type
- # * Other Nit objects are represented by `int` in Java. It holds the
- # pointer to the underlying C structure.
- # TODO create static Java types to store and hide the pointer
- private fun java_type: String do return "int"
+ # * Other Nit objects are represented by `NitObject` in Java, a class
+ # encapsulating the pointer to the underlying C structure.
+ private fun java_type: String do return "nit.app.NitObject"
+
+ # Is this type opaque in Java? As so it is represented by `nit.app.NitObject`.
+ private fun java_is_nit_object: Bool do return true
# JNI type name (in C)
#
# So this is a C type, usually defined in `jni.h`
- private fun jni_type: String do return "long"
+ private fun jni_type: String do return "jobject"
# JNI short type name (for signatures)
#
# Is used by `MMethod::build_jni_format` to pass a Java method signature
# to the JNI function `GetStaticMetodId`.
- private fun jni_format: String do return "I"
+ private fun jni_format: String do return "Lnit/app/NitObject;"
# Type name appearing within JNI function names.
#
redef fun compile_callback_to_java(mmodule, mainmodule, ccu)
do
+ if self isa MClassType and mclass.ftype isa ForeignJavaType then return
+
var java_file = mmodule.java_file
- if java_file == null then return
+ if java_file == null or mmodule.callbacks_used_from_java.callbacks.is_empty then return
for variation in ["incr", "decr"] do
var friendly_name = "{mangled_cname}_{variation}_ref"
# C
- var csignature = "void {mmodule.impl_java_class_name}_{friendly_name}(JNIEnv *env, jclass clazz, jint object)"
+ var csignature = "void {mmodule.impl_java_class_name}_{friendly_name}(JNIEnv *nit_ffi_jni_env, jclass clazz, jobject object)"
var cf = new CFunction("JNIEXPORT {csignature}")
- cf.exprs.add "\tnitni_global_ref_{variation}((void*)(long)object);"
+ cf.exprs.add "\tnitni_global_ref_{variation}(nit_ffi_with_java_nit_object_data(nit_ffi_jni_env, object));"
ccu.add_non_static_local_function cf
# Java
- java_file.class_content.add "private native static void {friendly_name}(int object);\n"
+ java_file.class_content.add "private native static void {friendly_name}(nit.app.NitObject object);\n"
end
end
var arr = new Array[String]
for variation in ["incr", "decr"] do
var friendly_name = "{mangled_cname}_{variation}_ref"
- var jni_format = "(I)V"
+ var jni_format = "(Lnit/app/NitObject;)V"
var cname = "{from_mmodule.impl_java_class_name}_{friendly_name}"
arr.add """{"{{{friendly_name}}}", "{{{jni_format}}}", {{{cname}}}}"""
end
return super
end
+ redef fun java_is_nit_object
+ do
+ var ftype = mclass.ftype
+ if ftype isa ForeignJavaType then return false
+
+ var java_primitives = once new HashSet[String].from(
+ ["Bool", "Char", "Int", "Float", "Byte", "Int8", "Int16", "UInt16", "Int32", "UInt32"])
+ return not java_primitives.has(mclass.name)
+ end
+
redef fun jni_type
do
var ftype = mclass.ftype
if mclass.name == "UInt32" then return "Int"
return super
end
+
+ redef fun compile_callback_to_java(mmodule, mainmodule, ccu)
+ do
+ # Don't generate functions for reference counters on extern classes
+ if mclass.ftype != null then return
+
+ super
+ end
+
+ redef fun jni_methods_declaration(from_mmodule)
+ do
+ # Don't generate functions for reference counters on extern classes
+ if mclass.ftype != null then return new Array[String]
+
+ return super
+ end
end
redef class MMethod
var cparams = new List[String]
- # This is different
- cparams.add "JNIEnv *env"
+ cparams.add "JNIEnv *nit_ffi_jni_env"
cparams.add "jclass clazz"
if not self.is_init then
nitlanguage / nit.git / blobdiff