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authordkf <donal.k.fellows@manchester.ac.uk>2008-05-31 11:41:59 (GMT)
committerdkf <donal.k.fellows@manchester.ac.uk>2008-05-31 11:41:59 (GMT)
commit5b6e0993e188fd16bbb2ec7f54b8b0c7be873629 (patch)
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parent032cdb06a8056b84ec16eaace0fc84044c95899a (diff)
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Implementation of TIP #257. Incomplete due to missing Win build support.
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+/*
+ * tclOOInt.h --
+ *
+ * This file contains the structure definitions and some of the function
+ * declarations for the object-system (NB: not Tcl_Obj, but ::oo).
+ *
+ * Copyright (c) 2006 by Donal K. Fellows
+ *
+ * See the file "license.terms" for information on usage and redistribution of
+ * this file, and for a DISCLAIMER OF ALL WARRANTIES.
+ *
+ * RCS: @(#) $Id: tclOOInt.h,v 1.1 2008/05/31 11:42:18 dkf Exp $
+ */
+
+#include <tclInt.h>
+#include "tclOO.h"
+
+/*
+ * Forward declarations.
+ */
+
+struct CallChain;
+struct Class;
+struct Foundation;
+struct Object;
+
+/*
+ * The data that needs to be stored per method. This record is used to collect
+ * information about all sorts of methods, including forwards, constructors
+ * and destructors.
+ */
+
+typedef struct Method {
+ const Tcl_MethodType *typePtr;
+ /* The type of method. If NULL, this is a
+ * special flag record which is just used for
+ * the setting of the flags field. */
+ int refCount;
+ ClientData clientData; /* Type-specific data. */
+ Tcl_Obj *namePtr; /* Name of the method. */
+ struct Object *declaringObjectPtr;
+ /* The object that declares this method, or
+ * NULL if it was declared by a class. */
+ struct Class *declaringClassPtr;
+ /* The class that declares this method, or
+ * NULL if it was declared directly on an
+ * object. */
+ int flags; /* Assorted flags. Includes whether this
+ * method is public/exported or not. */
+} Method;
+
+/*
+ * Pre- and post-call callbacks, to allow procedure-like methods to be fine
+ * tuned in their behaviour.
+ */
+
+typedef int (*TclOO_PreCallProc)(ClientData clientData, Tcl_Interp *interp,
+ Tcl_ObjectContext context, Tcl_CallFrame *framePtr, int *isFinished);
+typedef int (*TclOO_PostCallProc)(ClientData clientData, Tcl_Interp *interp,
+ Tcl_ObjectContext context, Tcl_Namespace *namespacePtr, int result);
+typedef void (*TclOO_PmCDDeleteProc)(ClientData clientData);
+typedef ClientData (*TclOO_PmCDCloneProc)(ClientData clientData);
+
+/*
+ * Procedure-like methods have the following extra information.
+ */
+
+typedef struct ProcedureMethod {
+ int version; /* Version of this structure. Currently must
+ * be 0. */
+ Proc *procPtr; /* Core of the implementation of the method;
+ * includes the argument definition and the
+ * body bytecodes. */
+ int flags; /* Flags to control features. */
+ int refCount;
+ ClientData clientData;
+ TclOO_PmCDDeleteProc deleteClientdataProc;
+ TclOO_PmCDCloneProc cloneClientdataProc;
+ ProcErrorProc errProc; /* Replacement error handler. */
+ TclOO_PreCallProc preCallProc;
+ /* Callback to allow for additional setup
+ * before the method executes. */
+ TclOO_PostCallProc postCallProc;
+ /* Callback to allow for additional cleanup
+ * after the method executes. */
+ GetFrameInfoValueProc gfivProc;
+ /* Callback to allow for fine tuning of how
+ * the method reports itself. */
+} ProcedureMethod;
+
+#define TCLOO_PROCEDURE_METHOD_VERSION 0
+
+/*
+ * Flags for use in a ProcedureMethod.
+ *
+ * When the USE_DECLARER_NS flag is set, the method will use the namespace of
+ * the object or class that declared it (or the clone of it, if it was from
+ * such that the implementation of the method came to the particular use)
+ * instead of the namespace of the object on which the method was invoked.
+ * This flag must be distinct from all others that are associated with
+ * methods.
+ */
+
+#define USE_DECLARER_NS 0x80
+
+/*
+ * Forwarded methods have the following extra information. It is a
+ * single-field structure because this allows for future expansion without
+ * changing vast amounts of code.
+ */
+
+typedef struct ForwardMethod {
+ Tcl_Obj *prefixObj;
+} ForwardMethod;
+
+/*
+ * Helper definitions that declare a "list" array. The two varieties are
+ * either optimized for simplicity (in the case that the whole array is
+ * typically assigned at once) or efficiency (in the case that the array is
+ * expected to be expanded over time). These lists are designed to be iterated
+ * over with the help of the FOREACH macro (see later in this file).
+ *
+ * The "num" field always counts the number of listType_t elements used in the
+ * "list" field. When a "size" field exists, it describes how many elements
+ * are present in the list; when absent, exactly "num" elements are present.
+ */
+
+#define LIST_STATIC(listType_t) \
+ struct { int num; listType_t *list; }
+#define LIST_DYNAMIC(listType_t) \
+ struct { int num, size; listType_t *list; }
+
+/*
+ * Now, the definition of what an object actually is.
+ */
+
+typedef struct Object {
+ struct Foundation *fPtr; /* The basis for the object system. Putting
+ * this here allows the avoidance of quite a
+ * lot of hash lookups on the critical path
+ * for object invokation and creation. */
+ Tcl_Namespace *namespacePtr;/* This object's tame namespace. */
+ Tcl_Command command; /* Reference to this object's public
+ * command. */
+ Tcl_Command myCommand; /* Reference to this object's internal
+ * command. */
+ struct Class *selfCls; /* This object's class. */
+ Tcl_HashTable *methodsPtr; /* Object-local Tcl_Obj (method name) to
+ * Method* mapping. */
+ LIST_STATIC(struct Class *) mixins;
+ /* Classes mixed into this object. */
+ LIST_STATIC(Tcl_Obj *) filters;
+ /* List of filter names. */
+ struct Class *classPtr; /* All classes have this non-NULL; it points
+ * to the class structure. Everything else has
+ * this NULL. */
+ int refCount; /* Number of strong references to this object.
+ * Note that there may be many more weak
+ * references; this mechanism is there to
+ * avoid Tcl_Preserve. */
+ int flags;
+ int creationEpoch; /* Unique value to make comparisons of objects
+ * easier. */
+ int epoch; /* Per-object epoch, incremented when the way
+ * an object should resolve call chains is
+ * changed. */
+ Tcl_HashTable *metadataPtr; /* Mapping from pointers to metadata type to
+ * the ClientData values that are the values
+ * of each piece of attached metadata. This
+ * field starts out as NULL and is only
+ * allocated if metadata is attached. */
+ Tcl_Obj *cachedNameObj; /* Cache of the name of the object. */
+ Tcl_HashTable *chainCache; /* Place to keep unused contexts. This table
+ * is indexed by method name as Tcl_Obj. */
+ Tcl_ObjectMapMethodNameProc mapMethodNameProc;
+ /* Function to allow remapping of method
+ * names. For itcl-ng. */
+} Object;
+
+#define OBJECT_DELETED 1 /* Flag to say that an object has been
+ * destroyed. */
+#define ROOT_OBJECT 0x1000 /* Flag to say that this object is the root of
+ * the class hierarchy and should be treated
+ * specially during teardown. */
+#define FILTER_HANDLING 0x2000 /* Flag set when the object is processing a
+ * filter; when set, filters are *not*
+ * processed on the object, preventing nasty
+ * recursive filtering problems. */
+#define USE_CLASS_CACHE 0x4000 /* Flag set to say that the object is a pure
+ * instance of the class, and has had nothing
+ * added that changes the dispatch chain (i.e.
+ * no methods, mixins, or filters. */
+
+/*
+ * And the definition of a class. Note that every class also has an associated
+ * object, through which it is manipulated.
+ */
+
+typedef struct Class {
+ Object *thisPtr; /* Reference to the object associated with
+ * this class. */
+ int refCount; /* Number of strong references to this class.
+ * Weak references are not counted; the
+ * purpose of this is to avoid Tcl_Preserve as
+ * that is quite slow. */
+ int flags; /* Assorted flags. */
+ LIST_STATIC(struct Class *) superclasses;
+ /* List of superclasses, used for generation
+ * of method call chains. */
+ LIST_DYNAMIC(struct Class *) subclasses;
+ /* List of subclasses, used to ensure deletion
+ * of dependent entities happens properly when
+ * the class itself is deleted. */
+ LIST_DYNAMIC(Object *) instances;
+ /* List of instances, used to ensure deletion
+ * of dependent entities happens properly when
+ * the class itself is deleted. */
+ LIST_STATIC(Tcl_Obj *) filters;
+ /* List of filter names, used for generation
+ * of method call chains. */
+ LIST_STATIC(struct Class *) mixins;
+ /* List of mixin classes, used for generation
+ * of method call chains. */
+ LIST_DYNAMIC(struct Class *) mixinSubs;
+ /* List of classes that this class is mixed
+ * into, used to ensure deletion of dependent
+ * entities happens properly when the class
+ * itself is deleted. */
+ Tcl_HashTable classMethods; /* Hash table of all methods. Hash maps from
+ * the (Tcl_Obj*) method name to the (Method*)
+ * method record. */
+ Method *constructorPtr; /* Method record of the class constructor (if
+ * any). */
+ Method *destructorPtr; /* Method record of the class destructor (if
+ * any). */
+ Tcl_HashTable *metadataPtr; /* Mapping from pointers to metadata type to
+ * the ClientData values that are the values
+ * of each piece of attached metadata. This
+ * field starts out as NULL and is only
+ * allocated if metadata is attached. */
+ struct CallChain *constructorChainPtr;
+ struct CallChain *destructorChainPtr;
+ Tcl_HashTable *classChainCache;
+ /* Places where call chains are stored. For
+ * constructors, the class chain is always
+ * used. For destructors and ordinary methods,
+ * the class chain is only used when the
+ * object doesn't override with its own mixins
+ * (and filters and method implementations for
+ * when getting method chains). */
+} Class;
+
+/*
+ * The foundation of the object system within an interpreter contains
+ * references to the key classes and namespaces, together with a few other
+ * useful bits and pieces. Probably ought to eventually go in the Interp
+ * structure itself.
+ */
+
+typedef struct ThreadLocalData {
+ int nsCount; /* Master epoch counter is used for keeping
+ * the values used in Tcl_Obj internal
+ * representations sane. Must be thread-local
+ * because Tcl_Objs can cross interpreter
+ * boundaries within a thread (objects don't
+ * generally cross threads). */
+} ThreadLocalData;
+
+typedef struct Foundation {
+ Tcl_Interp *interp;
+ Class *objectCls; /* The root of the object system. */
+ Class *classCls; /* The class of all classes. */
+ Tcl_Namespace *ooNs; /* Master ::oo namespace. */
+ Tcl_Namespace *defineNs; /* Namespace containing special commands for
+ * manipulating objects and classes. The
+ * "oo::define" command acts as a special kind
+ * of ensemble for this namespace. */
+ Tcl_Namespace *objdefNs; /* Namespace containing special commands for
+ * manipulating objects and classes. The
+ * "oo::objdefine" command acts as a special
+ * kind of ensemble for this namespace. */
+ Tcl_Namespace *helpersNs; /* Namespace containing the commands that are
+ * only valid when executing inside a
+ * procedural method. */
+ int epoch; /* Used to invalidate method chains when the
+ * class structure changes. */
+ ThreadLocalData *tsdPtr; /* Counter so we can allocate a unique
+ * namespace to each object. */
+ Tcl_Obj *unknownMethodNameObj;
+ /* Shared object containing the name of the
+ * unknown method handler method. */
+ Tcl_Obj *constructorName; /* Shared object containing the "name" of a
+ * constructor. */
+ Tcl_Obj *destructorName; /* Shared object containing the "name" of a
+ * destructor. */
+} Foundation;
+
+/*
+ * A call context structure is built when a method is called. They contain the
+ * chain of method implementations that are to be invoked by a particular
+ * call, and the process of calling walks the chain, with the [next] command
+ * proceeding to the next entry in the chain.
+ */
+
+#define CALL_CHAIN_STATIC_SIZE 4
+
+struct MInvoke {
+ Method *mPtr; /* Reference to the method implementation
+ * record. */
+ int isFilter; /* Whether this is a filter invokation. */
+ Class *filterDeclarer; /* What class decided to add the filter; if
+ * NULL, it was added by the object. */
+};
+
+typedef struct CallChain {
+ int objectCreationEpoch; /* The object's creation epoch. Note that the
+ * object reference is not stored in the call
+ * chain; it is in the call context. */
+ int objectEpoch; /* Local (object structure) epoch counter
+ * snapshot. */
+ int epoch; /* Global (class structure) epoch counter
+ * snapshot. */
+ int flags; /* Assorted flags, see below. */
+ int refCount; /* Reference count. */
+ int numChain; /* Size of the call chain. */
+ struct MInvoke *chain; /* Array of call chain entries. May point to
+ * staticChain if the number of entries is
+ * small. */
+ struct MInvoke staticChain[CALL_CHAIN_STATIC_SIZE];
+} CallChain;
+
+typedef struct CallContext {
+ Object *oPtr; /* The object associated with this call. */
+ int index; /* Index into the call chain of the currently
+ * executing method implementation. */
+ int skip; /* Current number of arguments to skip; can
+ * vary depending on whether it is a direct
+ * method call or a continuation via the
+ * [next] command. */
+ CallChain *callPtr; /* The actual call chain. */
+} CallContext;
+
+/*
+ * Bits for the 'flags' field of the call context.
+ */
+
+#define PUBLIC_METHOD 0x01 /* This is a public (exported) method. */
+#define PRIVATE_METHOD 0x02 /* This is a private (class's direct instances
+ * only) method. */
+#define OO_UNKNOWN_METHOD 0x04 /* This is an unknown method. */
+#define CONSTRUCTOR 0x08 /* This is a constructor. */
+#define DESTRUCTOR 0x10 /* This is a destructor. */
+
+/*
+ * Assorted flags for call frames. Note that bits 1 and 2 are already taken by
+ * Tcl itself.
+ */
+
+#if 0
+#define FRAME_IS_METHOD 0x4 /* The frame is a method body, and the frame's
+ * clientData field contains a CallContext
+ * reference. */
+#define FRAME_IS_OO_DEFINE 0x8 /* The frame is part of the inside workings of
+ * the [oo::define] command; the clientData
+ * field contains an Object reference that has
+ * been confirmed to refer to a class. */
+#endif
+
+/*
+ * Structure containing definition information about basic class methods.
+ */
+
+typedef struct {
+ const char *name; /* Name of the method in question. */
+ int isPublic; /* Whether the method is public by default. */
+ Tcl_MethodType definition; /* How to call the method. */
+} DeclaredClassMethod;
+
+/*
+ *----------------------------------------------------------------
+ * Commands relating to OO support.
+ *----------------------------------------------------------------
+ */
+
+MODULE_SCOPE int TclOOInit(Tcl_Interp *interp);
+MODULE_SCOPE int TclOODefineObjCmd(ClientData clientData,
+ Tcl_Interp *interp, int objc,
+ Tcl_Obj *const *objv);
+MODULE_SCOPE int TclOOObjDefObjCmd(ClientData clientData,
+ Tcl_Interp *interp, int objc,
+ Tcl_Obj *const *objv);
+MODULE_SCOPE int TclOODefineConstructorObjCmd(ClientData clientData,
+ Tcl_Interp *interp, int objc,
+ Tcl_Obj *const *objv);
+MODULE_SCOPE int TclOODefineDeleteMethodObjCmd(ClientData clientData,
+ Tcl_Interp *interp, int objc,
+ Tcl_Obj *const *objv);
+MODULE_SCOPE int TclOODefineDestructorObjCmd(ClientData clientData,
+ Tcl_Interp *interp, int objc,
+ Tcl_Obj *const *objv);
+MODULE_SCOPE int TclOODefineExportObjCmd(ClientData clientData,
+ Tcl_Interp *interp, int objc,
+ Tcl_Obj *const *objv);
+MODULE_SCOPE int TclOODefineFilterObjCmd(ClientData clientData,
+ Tcl_Interp *interp, int objc,
+ Tcl_Obj *const *objv);
+MODULE_SCOPE int TclOODefineForwardObjCmd(ClientData clientData,
+ Tcl_Interp *interp, int objc,
+ Tcl_Obj *const *objv);
+MODULE_SCOPE int TclOODefineMethodObjCmd(ClientData clientData,
+ Tcl_Interp *interp, int objc,
+ Tcl_Obj *const *objv);
+MODULE_SCOPE int TclOODefineMixinObjCmd(ClientData clientData,
+ Tcl_Interp *interp, const int objc,
+ Tcl_Obj *const *objv);
+MODULE_SCOPE int TclOODefineRenameMethodObjCmd(ClientData clientData,
+ Tcl_Interp *interp, int objc,
+ Tcl_Obj *const *objv);
+MODULE_SCOPE int TclOODefineSuperclassObjCmd(ClientData clientData,
+ Tcl_Interp *interp, int objc,
+ Tcl_Obj *const *objv);
+MODULE_SCOPE int TclOODefineUnexportObjCmd(ClientData clientData,
+ Tcl_Interp *interp, int objc,
+ Tcl_Obj *const *objv);
+MODULE_SCOPE int TclOODefineClassObjCmd(ClientData clientData,
+ Tcl_Interp *interp, int objc,
+ Tcl_Obj *const *objv);
+MODULE_SCOPE int TclOODefineSelfObjCmd(ClientData clientData,
+ Tcl_Interp *interp, int objc,
+ Tcl_Obj *const *objv);
+MODULE_SCOPE int TclOOUnknownDefinition(ClientData clientData,
+ Tcl_Interp *interp, int objc,
+ Tcl_Obj *const *objv);
+MODULE_SCOPE int TclOOCopyObjectCmd(ClientData clientData,
+ Tcl_Interp *interp, int objc,
+ Tcl_Obj *const *objv);
+MODULE_SCOPE int TclOONextObjCmd(ClientData clientData,
+ Tcl_Interp *interp, int objc,
+ Tcl_Obj *const *objv);
+MODULE_SCOPE int TclOOSelfObjCmd(ClientData clientData,
+ Tcl_Interp *interp, int objc,
+ Tcl_Obj *const *objv);
+
+/*
+ * Method implementations (in tclOOBasic.c).
+ */
+
+MODULE_SCOPE int TclOO_Class_Create(ClientData clientData,
+ Tcl_Interp *interp, Tcl_ObjectContext context,
+ int objc, Tcl_Obj *const *objv);
+MODULE_SCOPE int TclOO_Class_CreateNs(ClientData clientData,
+ Tcl_Interp *interp, Tcl_ObjectContext context,
+ int objc, Tcl_Obj *const *objv);
+MODULE_SCOPE int TclOO_Class_New(ClientData clientData,
+ Tcl_Interp *interp, Tcl_ObjectContext context,
+ int objc, Tcl_Obj *const *objv);
+MODULE_SCOPE int TclOO_Object_Destroy(ClientData clientData,
+ Tcl_Interp *interp, Tcl_ObjectContext context,
+ int objc, Tcl_Obj *const *objv);
+MODULE_SCOPE int TclOO_Object_Eval(ClientData clientData,
+ Tcl_Interp *interp, Tcl_ObjectContext context,
+ int objc, Tcl_Obj *const *objv);
+MODULE_SCOPE int TclOO_Object_LinkVar(ClientData clientData,
+ Tcl_Interp *interp, Tcl_ObjectContext context,
+ int objc, Tcl_Obj *const *objv);
+MODULE_SCOPE int TclOO_Object_Unknown(ClientData clientData,
+ Tcl_Interp *interp, Tcl_ObjectContext context,
+ int objc, Tcl_Obj *const *objv);
+MODULE_SCOPE int TclOO_Object_VarName(ClientData clientData,
+ Tcl_Interp *interp, Tcl_ObjectContext context,
+ int objc, Tcl_Obj *const *objv);
+
+/*
+ * Private definitions, some of which perhaps ought to be exposed properly or
+ * maybe just put in the internal stubs table.
+ */
+
+MODULE_SCOPE void TclOOAddToInstances(Object *oPtr, Class *clsPtr);
+MODULE_SCOPE void TclOOAddToMixinSubs(Class *subPtr, Class *mixinPtr);
+MODULE_SCOPE void TclOOAddToSubclasses(Class *subPtr, Class *superPtr);
+MODULE_SCOPE void TclOODeleteChain(CallChain *callPtr);
+MODULE_SCOPE void TclOODeleteChainCache(Tcl_HashTable *tablePtr);
+MODULE_SCOPE void TclOODeleteContext(CallContext *contextPtr);
+MODULE_SCOPE void TclOODelMethodRef(Method *method);
+MODULE_SCOPE CallContext *TclOOGetCallContext(Object *oPtr,
+ Tcl_Obj *methodNameObj, int flags);
+MODULE_SCOPE Foundation *TclOOGetFoundation(Tcl_Interp *interp);
+MODULE_SCOPE Tcl_Obj * TclOOGetFwdFromMethod(Method *mPtr);
+MODULE_SCOPE Proc * TclOOGetProcFromMethod(Method *mPtr);
+MODULE_SCOPE int TclOOGetSortedClassMethodList(Class *clsPtr,
+ int flags, const char ***stringsPtr);
+MODULE_SCOPE int TclOOGetSortedMethodList(Object *oPtr, int flags,
+ const char ***stringsPtr);
+MODULE_SCOPE int TclOOInit(Tcl_Interp *interp);
+MODULE_SCOPE void TclOOInitInfo(Tcl_Interp *interp);
+MODULE_SCOPE int TclOOInvokeContext(Tcl_Interp *interp,
+ CallContext *contextPtr, int objc,
+ Tcl_Obj *const *objv);
+MODULE_SCOPE void TclOONewBasicMethod(Tcl_Interp *interp, Class *clsPtr,
+ const DeclaredClassMethod *dcm);
+MODULE_SCOPE Tcl_Obj * TclOOObjectName(Tcl_Interp *interp, Object *oPtr);
+MODULE_SCOPE void TclOORemoveFromInstances(Object *oPtr, Class *clsPtr);
+MODULE_SCOPE void TclOORemoveFromMixinSubs(Class *subPtr,
+ Class *mixinPtr);
+MODULE_SCOPE void TclOORemoveFromSubclasses(Class *subPtr,
+ Class *superPtr);
+MODULE_SCOPE void TclOOStashContext(Tcl_Obj *objPtr,
+ CallContext *contextPtr);
+
+/*
+ * Include all the private API, generated from tclOO.decls.
+ */
+
+#include "tclOOIntDecls.h"
+
+/*
+ * A convenience macro for iterating through the lists used in the internal
+ * memory management of objects. This is a bit gnarly because we want to do
+ * the assignment of the picked-out value only when the body test succeeds,
+ * but we cannot rely on the assigned value being useful, forcing us to do
+ * some nasty stuff with the comma operator. The compiler's optimizer should
+ * be able to sort it all out!
+ *
+ * REQUIRES DECLARATION: int i;
+ */
+
+#define FOREACH(var,ary) \
+ for(i=0 ; (i<(ary).num?((var=(ary).list[i]),1):0) ; i++)
+
+/*
+ * Convenience macros for iterating through hash tables. FOREACH_HASH_DECLS
+ * sets up the declarations needed for the main macro, FOREACH_HASH, which
+ * does the actual iteration. FOREACH_HASH_VALUE is a restricted version that
+ * only iterates over values.
+ */
+
+#define FOREACH_HASH_DECLS \
+ Tcl_HashEntry *hPtr;Tcl_HashSearch search
+#define FOREACH_HASH(key,val,tablePtr) \
+ for(hPtr=Tcl_FirstHashEntry((tablePtr),&search); hPtr!=NULL ? \
+ ((key)=(void *)Tcl_GetHashKey((tablePtr),hPtr),\
+ (val)=Tcl_GetHashValue(hPtr),1):0; hPtr=Tcl_NextHashEntry(&search))
+#define FOREACH_HASH_VALUE(val,tablePtr) \
+ for(hPtr=Tcl_FirstHashEntry((tablePtr),&search); hPtr!=NULL ? \
+ ((val)=Tcl_GetHashValue(hPtr),1):0;hPtr=Tcl_NextHashEntry(&search))
+
+/*
+ * Convenience macro for duplicating a list. Needs no external declaration,
+ * but all arguments are used multiple times and so must have no side effects.
+ */
+
+#define DUPLICATE(target,source,type) \
+ do { \
+ register unsigned len = sizeof(type) * ((target).num=(source).num);\
+ if (len != 0) { \
+ memcpy(((target).list=(type*)ckalloc(len)), (source).list, len); \
+ } else { \
+ (target).list = NULL; \
+ } \
+ } while(0)
+
+/*
+ * Alternatives to Tcl_Preserve/Tcl_EventuallyFree/Tcl_Release.
+ */
+
+#define AddRef(ptr) ((ptr)->refCount++)
+#define DelRef(ptr) do { \
+ if (--(ptr)->refCount < 1) { \
+ ckfree((char *) (ptr)); \
+ } \
+ } while(0)
+
+/*
+ * Local Variables:
+ * mode: c
+ * c-basic-offset: 4
+ * fill-column: 78
+ * End:
+ */