X-Git-Url: http://nitlanguage.org

diff --git a/src/ffi/java.nit b/src/ffi/java.nit
index 44cf272..ae37d9d 100644
--- a/src/ffi/java.nit
+++ b/src/ffi/java.nit
@@ -155,6 +155,8 @@ class JavaLanguage
 		{{{block.code}}}
 	}
 """
+
+		mmodule.callbacks_used_from_java.join m.foreign_callbacks
 	end
 
 	redef fun compile_extern_class(block, m, ccu, mmodule) do end
@@ -170,7 +172,7 @@ class JavaLanguage
 		mmodule.insert_compiler_options
 
 		# Enable linking C callbacks to java native methods
-		mmodule.ensure_linking_callback_methods(ffi_ccu.as(not null), mmodule.ffi_callbacks[self])
+		mmodule.ensure_linking_callback_methods(ffi_ccu.as(not null))
 
 		# Java implementation code
 		var java_file = mmodule.java_file
@@ -189,6 +191,7 @@ class JavaLanguage
 end
 
 redef class MModule
+	private var callbacks_used_from_java = new ForeignCallbackSet
 
 	# Pure java class source file
 	private var java_file: nullable JavaClassTemplate = null
@@ -203,8 +206,9 @@ redef class MModule
 	end
 
 	# Compile C code to call JNI and link C callbacks implementations to Java extern methods
-	private fun ensure_linking_callback_methods(ccu: CCompilationUnit, callbacks: Set[NitniCallback])
+	private fun ensure_linking_callback_methods(ccu: CCompilationUnit)
 	do
+		var callbacks = callbacks_used_from_java.callbacks
 		if callbacks.is_empty then
 			ccu.body_decl.add "static int nit_ffi_with_java_registered_natives = 1;\n"
 			return
@@ -217,7 +221,7 @@ redef class MModule
 			jni_methods.add_all(cb.jni_methods_declaration(self))
 		end
 
-		var cf = new CFunction("static void nit_ffi_with_java_register_natives(JNIEnv* env, jclass jclazz)")
+		var cf = new CFunction("void nit_ffi_with_java_register_natives(JNIEnv* env, jclass jclazz)")
 		cf.exprs.add """
 	nit_ffi_with_java_registered_natives = 1;
 
@@ -238,8 +242,8 @@ redef class MModule
 	# Tell the C compiler where to find jni.h and how to link with libjvm
 	private fun insert_compiler_options
 	do
-		c_compiler_options = "{c_compiler_options} -I $(JAVA_HOME)/include/"
-		c_linker_options = "{c_linker_options} -L $(JNI_LIB_PATH) -ljvm"
+		cflags.add_one("", "-I $(JAVA_HOME)/include/ -I $(JAVA_HOME)/include/linux/")
+		ldflags.add_one("", "-L $(JNI_LIB_PATH) -ljvm")
 	end
 
 	# Name of the generated Java class where to store all implementation methods of this module
@@ -292,7 +296,7 @@ redef class AMethPropdef
 		assert sys_class != null
 		var sys_jni_env_meth = modelbuilder.try_get_mproperty_by_name2(self, mmodule, sys_class.mclass_type, "jni_env")
 		if sys_jni_env_meth == null or not sys_jni_env_meth isa MMethod then
-			toolcontext.error(self.location, "Java FFI error: you must import the `java` module when using the FFI with Java")
+			toolcontext.error(self.location, "Java FFI Error: you must import the `java` module when using the FFI with Java")
 			return
 		end
 
@@ -411,6 +415,8 @@ end
 redef class MExplicitCall
 	redef fun compile_callback_to_java(mmodule, mainmodule, ccu)
 	do
+		if not mmodule.callbacks_used_from_java.callbacks.has(self) then return
+
 		var mproperty = mproperty
 		assert mproperty isa MMethod
 
@@ -418,7 +424,7 @@ redef class MExplicitCall
 		var csignature = mproperty.build_c_implementation_signature(recv_mtype, mmodule, "___indirect", long_signature, from_java_call_context)
 		var cf = new CFunction("JNIEXPORT {csignature}")
 		cf.exprs.add "\t{mproperty.build_ccall(recv_mtype, mainmodule, null, long_signature, from_java_call_context, null)}\n"
-		ccu.add_local_function cf
+		ccu.add_non_static_local_function cf
 
 		# In Java, declare the extern method as a private static local method
 		var java_signature = mproperty.build_csignature(recv_mtype, mainmodule, null, short_signature, java_call_context)
@@ -512,6 +518,35 @@ redef class MClassType
 				else break
 			end
 
+			# Change `float[]` to `[float`
+			if jni_type.has('[') then
+				var depth = jni_type.chars.count('[')
+				var java_type = jni_type.replace("[]", "")
+				var short
+
+				if java_type == "boolean" then
+					short = "Z"
+				else if java_type == "byte" then
+					short = "B"
+				else if java_type == "char" then
+					short = "C"
+				else if java_type == "short" then
+					short = "S"
+				else if java_type == "int" then
+					short = "I"
+				else if java_type == "long" then
+					short = "J"
+				else if java_type == "float" then
+					short = "F"
+				else if java_type == "double" then
+					short = "D"
+				else
+					short = "L{java_type};"
+				end
+
+				return "["*depth + short
+			end
+
 			return "L{jni_type};"
 		end
 		if mclass.name == "Bool" then return "Z"
@@ -524,6 +559,7 @@ redef class MClassType
 	redef fun jni_signature_alt
 	do
 		var ftype = mclass.ftype
+
 		if ftype isa ForeignJavaType then return "Object"
 		if mclass.name == "Bool" then return "Boolean"
 		if mclass.name == "Char" then return "Char"
@@ -615,3 +651,17 @@ end
 private fun java_call_context: JavaCallContext do return new JavaCallContext
 private fun to_java_call_context: ToJavaCallContext do return new ToJavaCallContext
 private fun from_java_call_context: FromJavaCallContext do return new FromJavaCallContext
+
+redef class CCompilationUnit
+	# Similar to `add_local_function` but not `static`
+	#
+	# Used when the signature contains a visibility attribute.
+	private fun add_non_static_local_function(c_function: CFunction)
+	do
+		body_decl.add c_function.signature
+		body_decl.add ";\n"
+
+		body_impl.add "\n"
+		body_impl.add c_function.to_writer
+	end
+end