class SeparateErasureCompilerVisitor
	super SeparateCompilerVisitor

	redef fun compile_callsite(callsite, arguments)
	do
		var res = super
		if callsite.erasure_cast and not self.compiler.as(SeparateErasureCompiler).modelbuilder.toolcontext.opt_no_check_erasure_cast.value then
			assert res != null
			var mtype = callsite.msignature.return_mtype
			assert mtype != null
			self.add("/* Erasure cast for return {res} isa {mtype} */")
			var cond = self.type_test(res, mtype, "erasure")
			self.add("if (!{cond}) \{")
			#var x = self.class_name_string(res)
			#var y = self.class_name_string(arguments.first)
			#self.add("PRINT_ERROR(\"Erasure cast: expected {mtype} (self is %s), got %s for {res}\\n\", {y}, {x});")
			self.add_abort("Cast failed")
			self.add("\}")
		end
		return res
	end

	redef fun init_instance(mtype)
	do
		self.require_declaration("NEW_{mtype.mclass.c_name}")
		return self.new_expr("NEW_{mtype.mclass.c_name}()", mtype)
	end

	redef fun type_test(value, mtype, tag)
	do
		self.add("/* type test for {value.inspect} isa {mtype} */")

		var res = self.new_var(bool_type)

		var cltype = self.get_name("cltype")
		self.add_decl("int {cltype};")
		var idtype = self.get_name("idtype")
		self.add_decl("int {idtype};")

		var maybe_null = self.maybe_null(value)
		var accept_null = "0"
		if mtype isa MNullableType then
			mtype = mtype.mtype
			accept_null = "1"
		end
		if mtype isa MParameterType then
			# Here we get the bound of the the formal type (eh, erasure...)
			mtype = mtype.resolve_for(self.frame.mpropdef.mclassdef.bound_mtype, self.frame.mpropdef.mclassdef.bound_mtype, self.frame.mpropdef.mclassdef.mmodule, false)
			if mtype isa MNullableType then
				mtype = mtype.mtype
				accept_null = "1"
			end
		end

		if value.mcasttype.is_subtype(self.frame.mpropdef.mclassdef.mmodule, self.frame.mpropdef.mclassdef.bound_mtype, mtype) then
			self.add("{res} = 1; /* easy {value.inspect} isa {mtype}*/")
			if compiler.modelbuilder.toolcontext.opt_typing_test_metrics.value then
				self.compiler.count_type_test_skipped[tag] += 1
				self.add("count_type_test_skipped_{tag}++;")
			end
			return res
		end

		var class_ptr
		if not value.mtype.is_c_primitive then
			class_ptr = "{value}->class->"
		else
			var mclass = value.mtype.as(MClassType).mclass
			self.require_declaration("class_{mclass.c_name}")
			class_ptr = "class_{mclass.c_name}."
		end

		if mtype isa MClassType then
			self.require_declaration("class_{mtype.mclass.c_name}")
			self.add("{cltype} = class_{mtype.mclass.c_name}.color;")
			self.add("{idtype} = class_{mtype.mclass.c_name}.id;")
			if compiler.modelbuilder.toolcontext.opt_typing_test_metrics.value then
				self.compiler.count_type_test_resolved[tag] += 1
				self.add("count_type_test_resolved_{tag}++;")
			end
		else if mtype isa MVirtualType then
			var recv = self.frame.arguments.first
			var recv_ptr
			if not recv.mtype.is_c_primitive then
				recv_ptr = "{recv}->class->"
			else
				var mclass = recv.mtype.as(MClassType).mclass
				self.require_declaration("class_{mclass.c_name}")
				recv_ptr = "class_{mclass.c_name}."
			end
			var entry = self.get_name("entry")
			self.add("struct vts_entry {entry};")
			self.require_declaration(mtype.mproperty.const_color)
			self.add("{entry} = {recv_ptr}vts_table->vts[{mtype.mproperty.const_color}];")
			self.add("{cltype} = {entry}.class->color;")
			self.add("{idtype} = {entry}.class->id;")
			if maybe_null and accept_null == "0" then
				var is_nullable = self.get_name("is_nullable")
				self.add_decl("short int {is_nullable};")
				self.add("{is_nullable} = {entry}.is_nullable;")
				accept_null = is_nullable.to_s
			end
			if compiler.modelbuilder.toolcontext.opt_typing_test_metrics.value then
				self.compiler.count_type_test_unresolved[tag] += 1
				self.add("count_type_test_unresolved_{tag}++;")
			end
		else
			self.debug("type_test({value.inspect}, {mtype})")
			abort
		end

		# check color is in table
		if maybe_null then
			self.add("if({value} == NULL) \{")
			self.add("{res} = {accept_null};")
			self.add("\} else \{")
		end
		self.add("if({cltype} >= {class_ptr}type_table->size) \{")
		self.add("{res} = 0;")
		self.add("\} else \{")
		self.add("{res} = {class_ptr}type_table->table[{cltype}] == {idtype};")
		self.add("\}")
		if maybe_null then
			self.add("\}")
		end

		return res
	end

	redef fun unbox_extern(value, mtype)
	do
		if mtype isa MClassType and mtype.mclass.kind == extern_kind and
		   mtype.mclass.name != "CString" then
			var pointer_type = compiler.mainmodule.pointer_type
			var res = self.new_var_extern(mtype)
			self.add "{res} = ((struct instance_{pointer_type.c_name}*){value})->value; /* unboxing {value.mtype} */"
			return res
		else
			return value
		end
	end

	redef fun box_extern(value, mtype)
	do
		if mtype isa MClassType and mtype.mclass.kind == extern_kind and
		   mtype.mclass.name != "CString" then
			var valtype = compiler.mainmodule.pointer_type
			var res = self.new_var(mtype)
			if compiler.runtime_type_analysis != null and not compiler.runtime_type_analysis.live_types.has(value.mtype.as(MClassType)) then
				self.add("/*no boxing of {value.mtype}: {value.mtype} is not live! */")
				self.add("PRINT_ERROR(\"Dead code executed!\\n\"); fatal_exit(1);")
				return res
			end
			self.require_declaration("BOX_{valtype.c_name}")
			self.add("{res} = BOX_{valtype.c_name}({value}); /* boxing {value.mtype} */")
			self.require_declaration("class_{mtype.c_name}")
			self.add("{res}->class = &class_{mtype.c_name};")
			return res
		else
			return value
		end
	end

	redef fun class_name_string(value)
	do
		var res = self.get_name("var_class_name")
		self.add_decl("const char* {res};")
		if not value.mtype.is_c_primitive then
			self.add "{res} = {value} == NULL ? \"null\" : {value}->class->name;"
		else
			self.require_declaration("class_{value.mtype.c_name}")
			self.add "{res} = class_{value.mtype.c_name}.name;"
		end
		return res
	end

	redef fun native_array_instance(elttype, length)
	do
		var nclass = mmodule.native_array_class
		var mtype = nclass.get_mtype([elttype])
		var res = self.new_var(mtype)
		res.is_exact = true
		self.require_declaration("NEW_{nclass.c_name}")
		length = autobox(length, compiler.mainmodule.int_type)
		self.add("{res} = NEW_{nclass.c_name}({length});")
		return res
	end

        redef fun routine_ref_instance(routine_type, recv, callsite)
        do
		var mmethoddef = callsite.mpropdef
                #debug "ENTER ref_instance"
                var mmethod = mmethoddef.mproperty
                # routine_mclass is the specialized one, e.g: FunRef1, ProcRef2, etc..
                var routine_mclass = routine_type.mclass

                var nclasses = mmodule.model.get_mclasses_by_name("RoutineRef").as(not null)
                var base_routine_mclass = nclasses.first

                # All routine classes use the same `NEW` constructor.
                # However, they have different declared `class` and `type` value.
                self.require_declaration("NEW_{base_routine_mclass.c_name}")

                var recv_class_cname = recv.mcasttype.as(MClassType).mclass.c_name
                var my_recv = recv

                if recv.mtype.is_c_primitive then
                        my_recv = autobox(recv, mmodule.object_type)
                end
                var my_recv_mclass_type = my_recv.mtype.as(MClassType)

                # The class of the concrete Routine must exist (e.g ProcRef0, FunRef0, etc.)
                self.require_declaration("class_{routine_mclass.c_name}")

                self.require_declaration(mmethoddef.c_name)

                var thunk_function = mmethoddef.callref_thunk(my_recv_mclass_type)
                var runtime_function = mmethoddef.virtual_runtime_function

                var is_c_equiv = runtime_function.msignature.c_equiv(thunk_function.msignature)

                var c_ref = thunk_function.c_ref
                if is_c_equiv then
                        var const_color = mmethoddef.mproperty.const_color
                        c_ref = "{class_info(my_recv)}->vft[{const_color}]"
                        self.require_declaration(const_color)
                else
                        self.require_declaration(thunk_function.c_name)
                        compiler.thunk_todo(thunk_function)
                end
                compiler.thunk_todo(thunk_function)

                # Each RoutineRef points to a receiver AND a callref_thunk
                var res = self.new_expr("NEW_{base_routine_mclass.c_name}({my_recv}, (nitmethod_t){c_ref}, &class_{routine_mclass.c_name})", routine_type)
                #debug "LEAVING ref_instance"
                return res

        end
end