/* * 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) 2006-2012 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. */ #ifndef TCL_OO_INTERNAL_H #define TCL_OO_INTERNAL_H 1 #include "tclInt.h" #include "tclOO.h" /* * Hack to make things work with Objective C. Note that ObjC isn't really * supported, but we don't want to to be actively hostile to it. [Bug 2163447] */ #ifdef __OBJC__ #define Class TclOOClass #define Object TclOOObject #endif /* __OBJC__ */ /* * 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. */ typedef struct ForwardMethod { Tcl_Obj *prefixObj; /* The list of values to use to replace the * object and method name with. Will be a * non-empty list. */ } 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. */ LIST_STATIC(Tcl_Obj *) variables; } Object; #define OBJECT_DELETED 1 /* Flag to say that an object has been * destroyed. */ #define DESTRUCTOR_CALLED 2 /* Flag to say that the destructor has been * called. */ #define CLASS_GONE 4 /* Indicates that the class of this object has * been deleted, and so the object should not * attempt to remove itself from its class. */ #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. */ #define ROOT_CLASS 0x8000 /* Flag to say that this object is the root * class of classes, and should be treated * specially during teardown (and in a few * other spots). */ #define FORCE_UNKNOWN 0x10000 /* States that we are *really* looking up the * unknown method handler at that point. */ /* * 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). */ LIST_STATIC(Tcl_Obj *) variables; } 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. */ Tcl_Obj *clonedName; /* Shared object containing the name of a * "" pseudo-constructor. */ Tcl_Obj *defineName; /* Fully qualified name of oo::define. */ } 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 chain. */ #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. */ /* * 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 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 TclOODefineRenameMethodObjCmd(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 TclOODefineObjSelfObjCmd(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 TclOONextToObjCmd(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_Constructor(ClientData clientData, Tcl_Interp *interp, Tcl_ObjectContext context, int objc, Tcl_Obj *const *objv); 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 int TclNRNewObjectInstance(Tcl_Interp *interp, Tcl_Class cls, const char *nameStr, const char *nsNameStr, int objc, Tcl_Obj *const *objv, int skip, Tcl_Object *objectPtr); MODULE_SCOPE int TclOODefineSlots(Foundation *fPtr); 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, Tcl_Obj *cacheInThisObj); MODULE_SCOPE CallChain *TclOOGetStereotypeCallChain(Class *clsPtr, 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 Tcl_Obj * TclOOGetMethodBody(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(ClientData clientData, Tcl_Interp *interp, int objc, Tcl_Obj *const objv[]); MODULE_SCOPE int TclNRObjectContextInvokeNext(Tcl_Interp *interp, Tcl_ObjectContext context, int objc, Tcl_Obj *const *objv, int skip); 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 Tcl_Obj * TclOORenderCallChain(Tcl_Interp *interp, CallChain *callPtr); MODULE_SCOPE void TclOOStashContext(Tcl_Obj *objPtr, CallContext *contextPtr); MODULE_SCOPE void TclOOSetupVariableResolver(Tcl_Namespace *nsPtr); /* * 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. */ #undef DUPLICATE /* prevent possible conflict with definition in WINAPI nb30.h */ #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(ptr); \ } \ } while(0) #endif /* TCL_OO_INTERNAL_H */ /* * Local Variables: * mode: c * c-basic-offset: 4 * fill-column: 78 * End: */