subsystem: cleanup misc and make cpp a subsystem

Move a way from misc/ and put in its own subsystem to allow enhancements
in the future and make it a core part of Zephyr, not just something
misc.

Signed-off-by: Anas Nashif <anas.nashif@intel.com>

subsys/cpp/Kconfig

@@ -0,0 +1,7 @@
+
+config CPLUSPLUS
+	bool "Enable C++ support for the application"
+	default n
+	help
+	This option enables the use of applications built with C++.
+

subsys/cpp/Makefile

@@ -0,0 +1,7 @@
+
+obj-y += cpp_virtual.o \
+	cpp_vtable.o  \
+	cpp_init_array.o \
+	cpp_ctors.o \
+	cpp_dtors.o
+

subsys/cpp/cpp_ctors.c

@@ -0,0 +1,43 @@
+/*
+ * Copyright (c) 2012-2014 Wind River Systems, Inc.
+ *
+ * SPDX-License-Identifier: Apache-2.0
+ */
+
+/**
+ * @file - Constructor module
+ * @brief
+ * The ctors section contains a list of function pointers that execute the
+ * C++ constructors of static global objects. These must be executed before
+ * the application's main() routine.
+ *
+ * NOTE: Not all compilers put those function pointers into the ctors section;
+ * some put them into the init_array section instead.
+ */
+
+/* What a constructor function pointer looks like */
+
+typedef void (*CtorFuncPtr)(void);
+
+/* Constructor function pointer list is generated by the linker script. */
+
+extern CtorFuncPtr __CTOR_LIST__[];
+extern CtorFuncPtr __CTOR_END__[];
+
+/**
+ *
+ * @brief Invoke all C++ style global object constructors
+ *
+ * This routine is invoked by the kernel prior to the execution of the
+ * application's main().
+ */
+void __do_global_ctors_aux(void)
+{
+	unsigned int nCtors;
+
+	nCtors = (unsigned int)__CTOR_LIST__[0];
+
+	while (nCtors >= 1) {
+		__CTOR_LIST__[nCtors--]();
+	}
+}

subsys/cpp/cpp_dtors.c

@@ -0,0 +1,35 @@
+/*
+ * Copyright (c) 2016 Wind River Systems, Inc.
+ *
+ * SPDX-License-Identifier: Apache-2.0
+ */
+
+/*
+ * @file
+ * @brief Basic C++ destructor module for globals
+ *
+ */
+
+#include <toolchain.h>
+
+void *__dso_handle = 0;
+
+/**
+ * @brief Register destructor for a global object
+ *
+ * @param destructor the global object destructor function
+ * @param objptr global object pointer
+ * @param dso Dynamic Shared Object handle for shared libraries
+ *
+ * Function does nothing at the moment, assuming the global objects
+ * do not need to be deleted
+ *
+ * @return N/A
+ */
+int __cxa_atexit(void (*destructor)(void *), void *objptr, void *dso)
+{
+	ARG_UNUSED(destructor);
+	ARG_UNUSED(objptr);
+	ARG_UNUSED(dso);
+	return 0;
+}

subsys/cpp/cpp_init_array.c

@@ -0,0 +1,29 @@
+/*
+ * Copyright (c) 2015 Wind River Systems, Inc.
+ *
+ * SPDX-License-Identifier: Apache-2.0
+ */
+
+/*
+ * @file
+ * @brief Execute initialization routines referenced in .init_array section
+ */
+
+typedef void (*func_ptr)(void);
+
+extern func_ptr __init_array_start[0];
+extern func_ptr __init_array_end[0];
+
+/**
+ * @brief Execute initialization routines referenced in .init_array section
+ *
+ * @return N/A
+ */
+void __do_init_array_aux(void)
+{
+	for (func_ptr *func = __init_array_start;
+		func < __init_array_end;
+		func++) {
+		(*func)();
+	}
+}

subsys/cpp/cpp_virtual.c

@@ -0,0 +1,25 @@
+/*
+ * Copyright (c) 2015 Wind River Systems, Inc.
+ *
+ * SPDX-License-Identifier: Apache-2.0
+ */
+
+/*
+ * @file
+ * @brief Stub for C++ pure virtual functions
+ */
+
+/**
+ * @brief Stub for pure virtual functions
+ *
+ * This routine is needed for linking C++ code that uses pure virtual
+ * functions.
+ *
+ * @return N/A
+ */
+void __cxa_pure_virtual(void)
+{
+	while (1) {
+		;
+	}
+}

subsys/cpp/cpp_vtable.cpp

@@ -0,0 +1,27 @@
+/*
+ * Copyright (c) 2015 Wind River Systems, Inc.
+ *
+ * SPDX-License-Identifier: Apache-2.0
+ */
+
+/*
+ * @file
+ * @brief Stub for C++ virtual tables
+ */
+
+/**
+ *
+ * @brief basic virtual tables required for classes to build
+ *
+ */
+
+namespace __cxxabiv1 {
+	class __class_type_info {
+		virtual void dummy();
+	};
+	class __si_class_type_info {
+		virtual void dummy();
+	};
+	void __class_type_info::dummy() { }  // causes the vtable to get created here
+	void __si_class_type_info::dummy() { }  // causes the vtable to get created here
+};