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libcc1: add deleter objects 

This adds deleter objects for various kinds of protocol pointers to
libcc1.  Existing specializations of argument_wrapper are then
replaced with a single specialization that handles all pointer types
via the appropriate deleter.  The result here is a bit nicer because
the argument_wrapper boilerplate code is completely shared, leaving
just the memory-management detail to the particular specializations.

libcc1

	* rpc.hh (struct deleter): New template class and
	specializations.
	(argument_wrapper): Remove specializations.  Add specialization
	for any pointer type.
This commit is contained in:
Tom Tromey 2021-05-04 15:26:58 -06:00
parent e702c60e65
commit 0d5a0b9af5
1 changed files with 59 additions and 145 deletions
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204
libcc1/rpc.hh
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@ -22,6 +22,7 @@ along with GCC; see the file COPYING3. If not see
#include "status.hh"
#include "connection.hh"
#include <memory>
namespace cc1_plugin
{
@ -54,183 +55,96 @@ namespace cc1_plugin
T m_object;
};
// Specialization for any kind of pointer. This is declared but not
// defined to avoid bugs if a new pointer type is introduced into
// the API. Instead you will just get a compilation error.
template<typename T>
class argument_wrapper<const T *>;
// Any pointer type requires a deleter object that knows how to
// clean up. These are used in multiple places.
template<typename T> struct deleter;
// Specialization for string types.
template<>
class argument_wrapper<const char *>
struct deleter<char>
{
public:
argument_wrapper () : m_object (NULL) { }
~argument_wrapper ()
void operator() (char *s)
{
delete[] m_object;
delete[] s;
}
argument_wrapper (const argument_wrapper &) = delete;
argument_wrapper &operator= (const argument_wrapper &) = delete;
operator const char * () const
{
return m_object;
}
status unmarshall (connection *conn)
{
return ::cc1_plugin::unmarshall (conn, &m_object);
}
private:
char *m_object;
};
// Specialization for gcc_type_array.
template<>
class argument_wrapper<const gcc_type_array *>
struct deleter<gcc_type_array>
{
public:
argument_wrapper () : m_object (NULL) { }
~argument_wrapper ()
void operator() (gcc_type_array *p)
{
// It would be nicer if gcc_type_array could have a destructor.
// But, it is in code shared with gdb and cannot.
if (m_object != NULL)
delete[] m_object->elements;
delete m_object;
delete[] p->elements;
delete p;
}
argument_wrapper (const argument_wrapper &) = delete;
argument_wrapper &operator= (const argument_wrapper &) = delete;
operator const gcc_type_array * () const
{
return m_object;
}
status unmarshall (connection *conn)
{
return ::cc1_plugin::unmarshall (conn, &m_object);
}
private:
gcc_type_array *m_object;
};
#ifdef GCC_CP_INTERFACE_H
// Specialization for gcc_vbase_array.
template<>
class argument_wrapper<const gcc_vbase_array *>
struct deleter<gcc_vbase_array>
{
void operator() (gcc_vbase_array *p)
{
delete[] p->flags;
delete[] p->elements;
delete p;
}
};
template<>
struct deleter<gcc_cp_template_args>
{
void operator() (gcc_cp_template_args *p)
{
delete[] p->elements;
delete[] p->kinds;
delete p;
}
};
template<>
struct deleter<gcc_cp_function_args>
{
void operator() (gcc_cp_function_args *p)
{
delete[] p->elements;
delete p;
}
};
#endif // GCC_CP_INTERFACE_H
// Specialization for any kind of pointer.
template<typename T>
class argument_wrapper<T *>
{
public:
argument_wrapper () : m_object (NULL) { }
~argument_wrapper ()
{
// It would be nicer if gcc_type_array could have a destructor.
// But, it is in code shared with gdb and cannot.
if (m_object != NULL)
{
delete[] m_object->flags;
delete[] m_object->elements;
}
delete m_object;
}
argument_wrapper () = default;
~argument_wrapper () = default;
argument_wrapper (const argument_wrapper &) = delete;
argument_wrapper &operator= (const argument_wrapper &) = delete;
operator const gcc_vbase_array * () const
typedef typename std::remove_const<T>::type type;
operator const type * () const
{
return m_object;
return m_object.get ();
}
status unmarshall (connection *conn)
{
return ::cc1_plugin::unmarshall (conn, &m_object);
type *ptr;
if (!::cc1_plugin::unmarshall (conn, &ptr))
return FAIL;
m_object.reset (ptr);
return OK;
}
private:
gcc_vbase_array *m_object;
std::unique_ptr<type, deleter<type>> m_object;
};
// Specialization for gcc_cp_template_args.
template<>
class argument_wrapper<const gcc_cp_template_args *>
{
public:
argument_wrapper () : m_object (NULL) { }
~argument_wrapper ()
{
// It would be nicer if gcc_type_array could have a destructor.
// But, it is in code shared with gdb and cannot.
if (m_object != NULL)
{
delete[] m_object->elements;
delete[] m_object->kinds;
}
delete m_object;
}
argument_wrapper (const argument_wrapper &) = delete;
argument_wrapper &operator= (const argument_wrapper &) = delete;
operator const gcc_cp_template_args * () const
{
return m_object;
}
status unmarshall (connection *conn)
{
return ::cc1_plugin::unmarshall (conn, &m_object);
}
private:
gcc_cp_template_args *m_object;
};
// Specialization for gcc_cp_function_args.
template<>
class argument_wrapper<const gcc_cp_function_args *>
{
public:
argument_wrapper () : m_object (NULL) { }
~argument_wrapper ()
{
// It would be nicer if gcc_type_array could have a destructor.
// But, it is in code shared with gdb and cannot.
if (m_object != NULL)
{
delete[] m_object->elements;
}
delete m_object;
}
argument_wrapper (const argument_wrapper &) = delete;
argument_wrapper &operator= (const argument_wrapper &) = delete;
operator const gcc_cp_function_args * () const
{
return m_object;
}
status unmarshall (connection *conn)
{
return ::cc1_plugin::unmarshall (conn, &m_object);
}
private:
gcc_cp_function_args *m_object;
};
#endif /* GCC_CP_INTERFACE_H */
// There are two kinds of template functions here: "call" and
// "callback". "call" is implemented with variadic templates, but
// "callback" is repeated multiple times to handle different numbers