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/*
* tclNRE.h --
*
* This file contains declarations for the infrastructure for
* non-recursive commands. Contents may or may not migrate to tcl.h,
* tcl.decls, tclInt.h and/or tclInt.decls
*
* Copyright (c) 2008 by Miguel Sofer
*
* See the file "license.terms" for information on usage and redistribution of
* this file, and for a DISCLAIMER OF ALL WARRANTIES.
*
* // FIXME: RCS numbering?
* RCS: @(#) $Id: tclNRE.h,v 1.6 2008/07/21 16:26:08 msofer Exp $
*/
#ifndef _TCLNONREC
#define _TCLNONREC
/*****************************************************************************
* Stuff during devel
*****************************************************************************/
#define USE_SMALL_ALLOC 1 /* perf is important for some of these things! */
#define USE_STACK_ALLOC 1 /* good mainly for debugging, crashes at
* smallest timing error */
#define ENABLE_ASSERTS 1
/*
* IMPLEMENTED IN THIS VERSION - flags for partial enabling of the different
* parts, useful for debugging. May not work - meant to be used at "all ones"
*/
#define USE_NR_PROC 1 /* are procs defined as NR functions or not?
* Used for testing that the old interfaces
* still work, as they are used by TclOO and
* iTcl */
#define USE_NR_TEBC 1 /* does TEBC know about his special powers?
* with 1 TEBC remains on stack, TEOV gets
* evicted. */
#define USE_NR_ALIAS 1 /* First examples: my job */
#define USE_NR_IMPORTS 1 /* First examples: my job */
#define USE_NR_TAILCALLS 1 /* Incomplete implementation as
* tcl::unsupported::tailcall; best semantics
* are yet not 100% clear to me. */
#define USE_NR_NS_ENSEMBLE 1 /* snit!! */
/* Here to remind me of what's still missing: none of these do anything today */
#define USE_NR_EVAL 0 /* Tcl_EvalObj should be easy; the others may
* require some adapting of the parser. dgp? */
#define USE_NR_UPLEVEL 0 /* piece of cake, I think */
#define USE_NR_VAR_TRACES 0 /* require major redesign, I fear. About time
* for it too! */
#define USE_NR_CONTINUATIONS 0
#define MAKE_3X_FASTER 0
#define RULE_THE_WORLD 0
#define USE_NR_CMD_TRACES /* NEVER?? Maybe ... enter traces on the way in,
* leave traces done in the callback? So a trace
* just needs to replace the procPtr and
* clientData, and TEOV needn't know about the
* whole s**t! Mmhhh */
/*****************************************************************************
* Stuff for the public api: gone to the stubs table!
*
* Question: should we allow more callback requests during the callback
* itself? Easy enough to either handle or block, nothing done yet. We could
* also "lock" the Tcl stack during postProc, but it doesn't sound
* reasonable. I think.
*****************************************************************************/
/*****************************************************************************
* Private api fo NRE
*****************************************************************************/
/*
* Main data struct for representing NR commands (generated at runtime).
*/
struct ByteCode;
/* Fill up a SmallAlloc: 4 free ptrs for the user */
typedef struct TEOV_callback {
Tcl_NRPostProc *procPtr;
ClientData data[4];
struct TEOV_callback *nextPtr;
} TEOV_callback;
/* Try to keep within SmallAlloc sizes! */
typedef struct TEOV_record {
int type;
Command *cmdPtr;
TEOV_callback *callbackPtr;
struct TEOV_record *nextPtr;
union {
struct ByteCode *codePtr; /* TCL_NR_BC_TYPE */
struct {
Tcl_Obj *objPtr;
int flags;
} obj;
struct {
int objc;
Tcl_Obj **objv;
} objcv;
} data;
#if !USE_SMALL_ALLOC
/* Extra checks: can disappear later */
Tcl_Obj **tosPtr;
#endif
} TEOV_record;
/*
* The types for records; we save the first bit to indicate that it stores an
* obj, to indicate the necessary refCount management. That is, odd numbers
* only for obj-carrying types
*/
#define TCL_NR_NO_TYPE 0 /* for internal (cleanup) use only */
#define TCL_NR_BC_TYPE 2 /* procs, lambdas, TclOO+Itcl sometime ... */
#define TCL_NR_CMDSWAP_TYPE 4 /* ns-imports (cmdd redirect) */
#define TCL_NR_TAILCALL_TYPE 6
#define TCL_NR_TEBC_SWAPENV_TYPE 8 /* continuations, micro-threads !? */
#define TCL_NR_CMD_TYPE 1 /* i-alias, ns-ens use this */
#define TCL_NR_SCRIPT_TYPE 3 /* ns-eval, uplevel use this */
#define TCL_NR_HAS_OBJ(TYPE) ((TYPE) & 1)
#define TOP_RECORD(iPtr) (((Interp *)(iPtr))->execEnvPtr->recordPtr)
#define GET_TOSPTR(iPtr) \
(((Interp *)iPtr)->execEnvPtr->execStackPtr->tosPtr)
#if !USE_SMALL_ALLOC
#define STORE_EXTRA(iPtr, recordPtr) \
recordPtr->tosPtr = GET_TOSPTR(iPtr)
#else
#define STORE_EXTRA(iPtr, recordPtr)
#endif
/* A SINGLE record being pushed is what is detected as an NRE request by TEOV */
#define PUSH_RECORD(iPtr, recordPtr) \
TCLNR_ALLOC(interp, recordPtr); \
recordPtr->nextPtr = TOP_RECORD(iPtr); \
STORE_EXTRA(iPtr, recordPtr); \
TOP_RECORD(iPtr) = recordPtr; \
recordPtr->type = TCL_NR_NO_TYPE; \
recordPtr->cmdPtr = NULL; \
recordPtr->callbackPtr = NULL
#define TEBC_CALL(iPtr) \
(((Interp *)iPtr)->execEnvPtr->tebcCall)
#define TclNRAddCallback(\
interp,\
postProcPtr,\
data0,\
data1,\
data2,\
data3) \
{ \
TEOV_record *recordPtr; \
TEOV_callback *callbackPtr; \
\
recordPtr = TOP_RECORD(interp); \
TclSmallAlloc(sizeof(TEOV_callback), callbackPtr); \
\
callbackPtr->procPtr = (postProcPtr); \
callbackPtr->data[0] = (data0); \
callbackPtr->data[1] = (data1); \
callbackPtr->data[2] = (data2); \
callbackPtr->data[3] = (data3); \
\
callbackPtr->nextPtr = recordPtr->callbackPtr; \
recordPtr->callbackPtr = callbackPtr; \
}
/*
* These are only used by TEOV; here for ease of ref. They should move to
* tclBasic.c later on.
*/
#define COMPLETE_RECORD(recordPtr) \
/* accesses variables by name, careful */ \
recordPtr->cmdPtr = cmdPtr; \
#if !USE_SMALL_ALLOC
#define CHECK_EXTRA(iPtr, recordPtr) \
(recordPtr->tosPtr == GET_TOSPTR(iPtr))
#else
#define CHECK_EXTRA(iPtr, recordPtr) 1
#endif
#define POP_RECORD(iPtr, recordPtr) \
{ \
recordPtr = TOP_RECORD(iPtr); \
TOP_RECORD(iPtr) = recordPtr->nextPtr; \
}
#define FREE_RECORD(iPtr, recordPtr) \
{ \
TEOV_callback *callbackPtr = recordPtr->callbackPtr; \
if (TCL_NR_HAS_OBJ(recordPtr->type)) { \
Tcl_DecrRefCount(recordPtr->data.obj.objPtr); \
} \
while (callbackPtr) { \
callbackPtr = callbackPtr->nextPtr; \
TclSmallFree(recordPtr->callbackPtr); \
} \
TCLNR_FREE(((Tcl_Interp *)iPtr), recordPtr); \
}
#define CHECK_VALID_RETURN(iPtr, recordPtr) \
((TOP_RECORD(iPtr) == recordPtr) && \
CHECK_EXTRA(iPtr, recordPtr))
#define READ_OBJV_RECORD(recordPtr) /* TBD? Or read by hand (braille?) */
/*
* functions
*/
#if 0
/* built as static inline in tclProc.c. Do TclOO/Itcl need this? */
MODULE_SCOPE int Tcl_NRBC (Tcl_Interp * interp, ByteCode *codePtr,
Tcl_NRPostProc *postProcPtr, ClientData clientData);
#endif
/* The following starts purges the stack popping TclStackAllocs down to where
* tosPtr has the requested value. Panics on failure.*/
MODULE_SCOPE void TclStackPurge(Tcl_Interp *interp, Tcl_Obj **tosPtr);
/*
* Tailcalls!
*/
MODULE_SCOPE Tcl_ObjCmdProc TclNRApplyObjCmd;
MODULE_SCOPE Tcl_ObjCmdProc TclNRUplevelObjCmd;
MODULE_SCOPE Tcl_ObjCmdProc TclTailcallObjCmd;
/*****************************************************************************
* Stuff that goes away: temp during devel
*****************************************************************************/
#if USE_SMALL_ALLOC
#define TCLNR_ALLOC(interp, ptr) TclSmallAlloc(sizeof(TEOV_record), ptr)
#define TCLNR_FREE(interp, ptr) TclSmallFree((ptr))
#elif USE_STACK_ALLOC
#define TCLNR_ALLOC(interp, ptr) (ptr = TclStackAlloc(interp, sizeof(TEOV_record)))
#define TCLNR_FREE(interp, ptr) TclStackFree(interp, (ptr))
#else
#define TCLNR_ALLOC(interp, size, ptr) (ptr = ((ClientData) ckalloc(sizeof(TEOV_record))))
#define TCLNR_FREE(interp, ptr) ckfree((char *) (ptr))
#endif
#if ENABLE_ASSERTS
#include <assert.h>
#else
#define assert(expr)
#endif
#endif /* _TCLNONREC */
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