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Follow practices suggested by "Effective C++"

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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
This commit is contained in:
Norman Feske
2017-12-21 15:42:15 +01:00
committed by Christian Helmuth
parent 2a33d9aa76
commit eba9c15746
763 changed files with 4936 additions and 3288 deletions
Download Patch File Download Diff File Expand all files Collapse all files

28
repos/os/src/lib/vfs/tar_file_system.h
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@ -34,6 +34,12 @@ class Vfs::Tar_file_system : public File_system
char *_tar_base = _tar_ds.local_addr<char>();
file_size const _tar_size = _tar_ds.size();
/*
* Noncopyable
*/
Tar_file_system(Tar_file_system const &);
Tar_file_system &operator = (Tar_file_system const &);
class Record
{
private:
@ -90,6 +96,14 @@ class Vfs::Tar_file_system : public File_system
class Tar_vfs_handle : public Vfs_handle
{
private:
/*
* Noncopyable
*/
Tar_vfs_handle(Tar_vfs_handle const &);
Tar_vfs_handle &operator = (Tar_vfs_handle const &);
protected:
Node const *_node;
@ -400,7 +414,7 @@ class Vfs::Tar_file_system : public File_system
struct Num_dirent_cache
{
Lock lock;
Lock lock { };
Node &root_node;
bool valid; /* true after first lookup */
char key[256]; /* key used for lookup */
@ -603,7 +617,7 @@ class Vfs::Tar_file_system : public File_system
return OPEN_OK;
}
Opendir_result opendir(char const *path, bool create,
Opendir_result opendir(char const *path, bool /* create */,
Vfs_handle **out_handle,
Genode::Allocator& alloc) override
{
@ -618,9 +632,9 @@ class Vfs::Tar_file_system : public File_system
return OPENDIR_OK;
}
Openlink_result openlink(char const *path, bool create,
Vfs_handle **out_handle, Allocator &alloc)
{
Openlink_result openlink(char const *path, bool /* create */,
Vfs_handle **out_handle, Allocator &alloc)
{
Node const *node = dereference(path);
if (!node || !node->record ||
node->record->type() != Record::TYPE_SYMLINK)
@ -629,7 +643,7 @@ class Vfs::Tar_file_system : public File_system
*out_handle = new (alloc) Tar_vfs_symlink_handle(*this, alloc, 0, node);
return OPENLINK_OK;
}
}
void close(Vfs_handle *vfs_handle) override
{
@ -672,7 +686,7 @@ class Vfs::Tar_file_system : public File_system
return handle->read(dst, count, out_count);
}
Ftruncate_result ftruncate(Vfs_handle *handle, file_size) override
Ftruncate_result ftruncate(Vfs_handle *, file_size) override
{
return FTRUNCATE_ERR_NO_PERM;
}