eba9c15746
The patch adjust the code of the base, base-<kernel>, and os repository.
To adapt existing components to fix violations of the best practices
suggested by "Effective C++" as reported by the -Weffc++ compiler
argument. The changes follow the patterns outlined below:
* A class with virtual functions can no longer publicly inherit base
classed without a vtable. The inherited object may either be moved
to a member variable, or inherited privately. The latter would be
used for classes that inherit 'List::Element' or 'Avl_node'. In order
to enable the 'List' and 'Avl_tree' to access the meta data, the
'List' must become a friend.
* Instead of adding a virtual destructor to abstract base classes,
we inherit the new 'Interface' class, which contains a virtual
destructor. This way, single-line abstract base classes can stay
as compact as they are now. The 'Interface' utility resides in
base/include/util/interface.h.
* With the new warnings enabled, all member variables must be explicitly
initialized. Basic types may be initialized with '='. All other types
are initialized with braces '{ ... }' or as class initializers. If
basic types and non-basic types appear in a row, it is nice to only
use the brace syntax (also for basic types) and align the braces.
* If a class contains pointers as members, it must now also provide a
copy constructor and assignment operator. In the most cases, one
would make them private, effectively disallowing the objects to be
copied. Unfortunately, this warning cannot be fixed be inheriting
our existing 'Noncopyable' class (the compiler fails to detect that
the inheriting class cannot be copied and still gives the error).
For now, we have to manually add declarations for both the copy
constructor and assignment operator as private class members. Those
declarations should be prepended with a comment like this:
/*
* Noncopyable
*/
Thread(Thread const &);
Thread &operator = (Thread const &);
In the future, we should revisit these places and try to replace
the pointers with references. In the presence of at least one
reference member, the compiler would no longer implicitly generate
a copy constructor. So we could remove the manual declaration.
Issue #465
64 lines
2.1 KiB
C++
64 lines
2.1 KiB
C++
/*
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* \brief Kernel-specific thread meta data
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* \author Norman Feske
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* \date 2016-03-11
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*
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* On most platforms, the 'Genode::Native_thread' type is private to the
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* base framework. However, on NOVA, we make the type publicly available to
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* expose the low-level thread-specific capability selectors to user-level
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* virtual-machine monitors (Seoul or VirtualBox).
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*/
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/*
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* Copyright (C) 2016-2017 Genode Labs GmbH
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*
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* This file is part of the Genode OS framework, which is distributed
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* under the terms of the GNU Affero General Public License version 3.
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*/
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#ifndef _INCLUDE__NOVA__NATIVE_THREAD_H_
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#define _INCLUDE__NOVA__NATIVE_THREAD_H_
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#include <base/stdint.h>
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#include <nova/receive_window.h>
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namespace Genode { struct Native_thread; }
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struct Genode::Native_thread
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{
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static constexpr unsigned long INVALID_INDEX = ~0UL;
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addr_t ec_sel { 0 }; /* selector for execution context */
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addr_t exc_pt_sel { 0 }; /* base of event portal window */
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bool vcpu { false }; /* true if thread is a virtual CPU */
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addr_t initial_ip { 0 }; /* initial IP of local thread */
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/* receive window for capability selectors received at the server side */
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Receive_window server_rcv_window { };
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/*
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* Designated selector to populate with the result of an IPC call
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*
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* By default, the client-side receive window for delegated selectors
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* is automatically allocated within the component's selector space.
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* However, in special cases such as during the initialization of a
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* user-level VMM (ports/include/vmm/vcpu_dispatcher.h), the targeted
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* selector is defined manually. The 'client_rcv_sel' provides the
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* hook for such a manual allocation. If it contains a valid selector
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* value, the value is used as the basis of the receive window of an
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* 'ipc_call'.
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*/
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addr_t client_rcv_sel = INVALID_INDEX;
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void reset_client_rcv_sel() { client_rcv_sel = INVALID_INDEX; }
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Native_capability pager_cap { };
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Native_thread() : ec_sel(INVALID_INDEX),
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exc_pt_sel(INVALID_INDEX),
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vcpu(false),
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initial_ip(0) { }
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};
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#endif /* _INCLUDE__NOVA__NATIVE_THREAD_H_ */
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