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/* protocol.h: PROTOCOL INHERITANCE DEFINITIONS
*
* $Id$
* Copyright (c) 2001 Ravenbrook Limited. See end of file for license.
*/
#ifndef protocol_h
#define protocol_h
#include "config.h"
#include "mpmtypes.h"
/* Name derivation macros. These are not intended to be used */
/* outside of this file */
#define DERIVE_LOCAL(name) protocol ## name
#define DERIVE_STRUCT(name) name ## Struct
#define DERIVE_ENSURE(name) name ## Get
#define DERIVE_ENSURE_OLD(name) Ensure ## name
#define DERIVE_ENSURE_INTERNAL(name) protocolGet ## name
#define DERIVE_GUARDIAN(name) protocol ## name ## Guardian
#define DERIVE_STATIC_STORAGE(name) protocol ## name ## Struct
/* Macro to set the superclass field. This is not intended */
/* to be used outside this file. This is a polymorphic macro */
/* named as a function. See <design/protocol/#introspect.c-lang> */
#define ProtocolClassSetSuperclassPoly(class, super) \
(((ProtocolClass)(class))->superclass) = (ProtocolClass)(super)
/* DEFINE_CLASS -- the standard macro for defining a ProtocolClass */
#define DEFINE_CLASS(className, var) \
static Bool DERIVE_GUARDIAN(className) = FALSE; \
static DERIVE_STRUCT(className) DERIVE_STATIC_STORAGE(className); \
static void DERIVE_ENSURE_INTERNAL(className)(className); \
extern className DERIVE_ENSURE(className)(void); \
className DERIVE_ENSURE(className)(void) \
{ \
if (DERIVE_GUARDIAN(className) == FALSE) { \
LockClaimGlobalRecursive(); \
if (DERIVE_GUARDIAN(className) == FALSE) { \
DERIVE_ENSURE_INTERNAL(className) \
(&DERIVE_STATIC_STORAGE(className)); \
DERIVE_GUARDIAN(className) = TRUE; \
} \
LockReleaseGlobalRecursive(); \
} \
return &DERIVE_STATIC_STORAGE(className); \
} \
/* old name for backward compatibility */ \
extern className DERIVE_ENSURE_OLD(className)(void); \
className DERIVE_ENSURE_OLD(className)(void) \
{ \
return DERIVE_ENSURE(className)(); \
} \
static void DERIVE_ENSURE_INTERNAL(className) (className var)
/* INHERIT_CLASS -- the standard macro for inheriting from a superclass */
#define INHERIT_CLASS(this, parentName) \
BEGIN \
parentName DERIVE_LOCAL(parentName) = DERIVE_ENSURE(parentName)(); \
*this = *(DERIVE_LOCAL(parentName)); \
ProtocolClassSetSuperclassPoly(this, DERIVE_LOCAL(parentName)); \
END
/* DEFINE_ALIAS_CLASS -- define a new class for the same type
*
* A convenience macro. Aliases the structure and pointer types
* for className to be the same as typeName, and then defines
* the class className.
*/
#define DEFINE_ALIAS_CLASS(className, typeName, var) \
typedef typeName className; \
typedef DERIVE_STRUCT(typeName) DERIVE_STRUCT(className); \
DEFINE_CLASS(className, var)
#define ProtocolClassSig ((Sig)0x519B60C7) /* SIGnature PROtocol CLass */
#define ProtocolInstSig ((Sig)0x519B6014) /* SIGnature PROtocol INst */
/* ProtocolClass -- the class containing the support for the protocol */
typedef struct ProtocolClassStruct *ProtocolClass;
/* ProtocolInst -- the instance structure for support of the protocol */
typedef struct ProtocolInstStruct *ProtocolInst;
/* ProtocolCoerceInstMethod -- coerce "pro" to an instance of "interface"
*
* If "pro" is an instance of "interface", then returns TRUE
* and sets coerceResult to point directly to the part of "pro"
* which contains the slots for "interface"
* RHSK 2006-04-05 s/interface/interfaceIn/: job000605, suspect msvc bug.
*/
typedef Bool (*ProtocolCoerceInstMethod)(ProtocolInst *coerceResult,
ProtocolInst pro,
ProtocolClass interfaceIn);
/* ProtocolCoerceClassMethod -- coerce "proClass" to an "interface" class
*
* If "proClass" is a subclass of "interface", then returns TRUE
* and sets coerceResult to point directly to the part of
* "proClass" which contains the slots for "interface".
* RHSK 2006-04-05 s/interface/interfaceIn/: job000605, suspect msvc bug.
*/
typedef Bool (*ProtocolCoerceClassMethod)(ProtocolClass *coerceResult,
ProtocolClass proClass,
ProtocolClass interfaceIn);
typedef struct ProtocolClassStruct {
Sig sig; /* <design/sig/> */
ProtocolClass superclass; /* the superclass */
ProtocolCoerceInstMethod coerceInst; /* coerce instance to super */
ProtocolCoerceClassMethod coerceClass; /* coerce class to superclass */
} ProtocolClassStruct;
typedef struct ProtocolInstStruct {
Sig sig; /* <design/sig/> */
ProtocolClass class; /* the class */
} ProtocolInstStruct;
/* ProtocolClassGet -- Returns the root of the protocol class hierarchy
*
* Function name conforms to standard conventions for
* protocols.
*/
extern ProtocolClass ProtocolClassGet(void);
/* Checking functions */
extern Bool ProtocolClassCheck(ProtocolClass class);
extern Bool ProtocolInstCheck(ProtocolInst pro);
/* ProtocolIsSubclass - use macro IsSubclass to access this.
*
* A predicate for testing subclass relationships.
* A protocol class is always a subclass of itself.
*/
extern Bool ProtocolIsSubclass(ProtocolClass sub, ProtocolClass super);
/* Protocol introspection interface */
/* The following are macros because of the need to cast */
/* subtypes of ProtocolClass. Nevertheless they are named */
/* as functions. See <design/protocol/#introspect.c-lang> */
#define ProtocolClassSuperclassPoly(class) \
(((ProtocolClass)(class))->superclass)
#define ClassOfPoly(inst) ((ProtocolInst)(inst)->class)
#define IsSubclassPoly(sub, super) \
ProtocolIsSubclass((ProtocolClass)(sub), (ProtocolClass)(super))
/* SUPERCLASS - get the superclass object, given a class name
*
* Returns the superclass, with type ProtocolClass. Clients will
* probably wish to cast this. See
* <design/protocol/#int.static-superclass>
*/
#define SUPERCLASS(className) \
ProtocolClassSuperclassPoly(DERIVE_ENSURE(className)())
#endif /* protocol_h */
/* C. COPYRIGHT AND LICENSE
*
* Copyright (C) 2001-2002 Ravenbrook Limited <http://www.ravenbrook.com/>.
* All rights reserved. This is an open source license. Contact
* Ravenbrook for commercial licensing options.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are
* met:
*
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
*
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* 3. Redistributions in any form must be accompanied by information on how
* to obtain complete source code for this software and any accompanying
* software that uses this software. The source code must either be
* included in the distribution or be available for no more than the cost
* of distribution plus a nominal fee, and must be freely redistributable
* under reasonable conditions. For an executable file, complete source
* code means the source code for all modules it contains. It does not
* include source code for modules or files that typically accompany the
* major components of the operating system on which the executable file
* runs.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS
* IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
* TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR
* PURPOSE, OR NON-INFRINGEMENT, ARE DISCLAIMED. IN NO EVENT SHALL THE
* COPYRIGHT HOLDERS AND CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
* USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON
* ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
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