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author | mig <mig> | 2013-01-10 21:18:52 (GMT) |
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committer | mig <mig> | 2013-01-10 21:18:52 (GMT) |
commit | d562dc0f601c1e4871dea0129f2e43bfca1fdb0a (patch) | |
tree | ba9d20a99fce98d2f9273df62edbb14bab9f55d8 | |
parent | 9f0eb68928b94f54baa4624b6b6fc6c280263605 (diff) | |
download | tcl-d562dc0f601c1e4871dea0129f2e43bfca1fdb0a.zip tcl-d562dc0f601c1e4871dea0129f2e43bfca1fdb0a.tar.gz tcl-d562dc0f601c1e4871dea0129f2e43bfca1fdb0a.tar.bz2 |
tailcall now running in a simpler model, with no eval-flags and no nre-stack rewriting; yieldto also requires one fewer bounce. Mostly from mig-nre-mods
-rw-r--r-- | generic/tclBasic.c | 142 | ||||
-rw-r--r-- | generic/tclCompCmdsSZ.c | 4 | ||||
-rw-r--r-- | generic/tclEnsemble.c | 4 | ||||
-rw-r--r-- | generic/tclExecute.c | 20 | ||||
-rw-r--r-- | generic/tclInt.h | 36 | ||||
-rw-r--r-- | generic/tclInterp.c | 4 | ||||
-rw-r--r-- | generic/tclNamesp.c | 4 |
7 files changed, 87 insertions, 127 deletions
diff --git a/generic/tclBasic.c b/generic/tclBasic.c index 562cca6..55014ec 100644 --- a/generic/tclBasic.c +++ b/generic/tclBasic.c @@ -160,10 +160,7 @@ static Tcl_NRPostProc TEOV_Exception; static Tcl_NRPostProc TEOV_NotFoundCallback; static Tcl_NRPostProc TEOV_RestoreVarFrame; static Tcl_NRPostProc TEOV_RunLeaveTraces; -static Tcl_NRPostProc YieldToCallback; -static void ClearTailcall(Tcl_Interp *interp, - struct NRE_callback *tailcallPtr); static Tcl_ObjCmdProc NRCoroInjectObjCmd; MODULE_SCOPE const TclStubs tclStubs; @@ -4161,7 +4158,8 @@ TclNREvalObjv( int result; Namespace *lookupNsPtr = iPtr->lookupNsPtr; Command **cmdPtrPtr; - + NRE_callback *callbackPtr; + iPtr->lookupNsPtr = NULL; /* @@ -4174,15 +4172,17 @@ TclNREvalObjv( * finishes the source command and not just the target. */ - if (iPtr->evalFlags & TCL_EVAL_REDIRECT) { - TclNRAddCallback(interp, NRCommand, NULL, INT2PTR(1), INT2PTR(objc), objv); - iPtr->evalFlags &= ~TCL_EVAL_REDIRECT; + if (iPtr->deferredCallbacks) { + callbackPtr = iPtr->deferredCallbacks; + iPtr->deferredCallbacks = NULL; } else { - TclNRAddCallback(interp, NRCommand, NULL, NULL, INT2PTR(objc), objv); + TclNRAddCallback(interp, NRCommand, NULL, NULL, NULL, NULL); + callbackPtr = TOP_CB(interp); } - cmdPtrPtr = (Command **) &(TOP_CB(interp)->data[0]); + cmdPtrPtr = (Command **) &(callbackPtr->data[0]); - TclNRSpliceDeferred(interp); + callbackPtr->data[2] = INT2PTR(objc); + callbackPtr->data[3] = (ClientData) objv; iPtr->numLevels++; result = TclInterpReady(interp); @@ -4368,6 +4368,14 @@ NRCommand( } ((Interp *)interp)->numLevels--; + /* + * If there is a tailcall, schedule it + */ + + if (data[1] && (data[1] != INT2PTR(1))) { + TclNRAddCallback(interp, TclNRTailcallEval, data[1], NULL, NULL, NULL); + } + /* OPT ?? * Do not interrupt a series of cleanups with async or limit checks: * just check at the end? @@ -4625,9 +4633,9 @@ TEOV_NotFound( savedNsPtr = varFramePtr->nsPtr; varFramePtr->nsPtr = lookupNsPtr; } - TclNRDeferCallback(interp, TEOV_NotFoundCallback, INT2PTR(handlerObjc), + TclDeferCallbacks(interp, 1); + TclNRAddCallback(interp, TEOV_NotFoundCallback, INT2PTR(handlerObjc), newObjv, savedNsPtr, NULL); - iPtr->evalFlags |= TCL_EVAL_REDIRECT; return TclNREvalObjv(interp, newObjc, newObjv, TCL_EVAL_NOERR, NULL); } @@ -6012,7 +6020,8 @@ TclNREvalObjEx( iPtr->cmdFramePtr = eoFramePtr; } - TclNRDeferCallback(interp, TEOEx_ListCallback, listPtr, eoFramePtr, + TclDeferCallbacks(interp, 0); + TclNRAddCallback(interp, TEOEx_ListCallback, listPtr, eoFramePtr, NULL, NULL); ListObjGetElements(listPtr, objc, objv); @@ -8269,29 +8278,43 @@ Tcl_NRCmdSwap( */ void -TclSpliceTailcall( +TclDeferCallbacks( Tcl_Interp *interp, - NRE_callback *tailcallPtr) + int skipTailcalls) +{ + Interp *iPtr = (Interp *) interp; + + if (iPtr->deferredCallbacks == NULL) { + TclNRAddCallback(interp, NRCommand, NULL, INT2PTR(skipTailcalls != 0), + NULL, NULL); + iPtr->deferredCallbacks = TOP_CB(interp); + } else if (skipTailcalls) { + iPtr->deferredCallbacks->data[1] = INT2PTR(skipTailcalls != 0); + } +} + +void +TclSetTailcall( + Tcl_Interp *interp, + Tcl_Obj *listPtr) { /* * Find the splicing spot: right before the NRCommand of the thing - * being tailcalled. Note that we skip NRCommands marked in data[1] + * being tailcalled. Note that we skip NRCommands marked by a 1 in data[1] * (used by command redirectors). */ NRE_callback *runPtr; for (runPtr = TOP_CB(interp); runPtr; runPtr = runPtr->nextPtr) { - if (((runPtr->procPtr) == NRCommand) && !runPtr->data[1]) { + if (((runPtr->procPtr) == NRCommand) && !runPtr->data[1]) { break; } } if (!runPtr) { Tcl_Panic("tailcall cannot find the right splicing spot: should not happen!"); } - - tailcallPtr->nextPtr = runPtr->nextPtr; - runPtr->nextPtr = tailcallPtr; + runPtr->data[1] = listPtr; } int @@ -8321,7 +8344,7 @@ TclNRTailcallObjCmd( */ if (iPtr->varFramePtr->tailcallPtr) { - ClearTailcall(interp, iPtr->varFramePtr->tailcallPtr); + Tcl_DecrRefCount(iPtr->varFramePtr->tailcallPtr); iPtr->varFramePtr->tailcallPtr = NULL; } @@ -8336,23 +8359,20 @@ TclNRTailcallObjCmd( Tcl_Obj *listPtr, *nsObjPtr; Tcl_Namespace *nsPtr = (Tcl_Namespace *) iPtr->varFramePtr->nsPtr; Tcl_Namespace *ns1Ptr; - NRE_callback *tailcallPtr; - listPtr = Tcl_NewListObj(objc-1, objv+1); - Tcl_IncrRefCount(listPtr); + /* The tailcall data is in a Tcl list: the first element is the + * namespace, the rest the command to be tailcalled. */ + + listPtr = Tcl_NewListObj(objc, objv); nsObjPtr = Tcl_NewStringObj(nsPtr->fullName, -1); if ((TCL_OK != TclGetNamespaceFromObj(interp, nsObjPtr, &ns1Ptr)) || (nsPtr != ns1Ptr)) { Tcl_Panic("Tailcall failed to find the proper namespace"); } - Tcl_IncrRefCount(nsObjPtr); - - TclNRAddCallback(interp, TclNRTailcallEval, listPtr, nsObjPtr, - NULL, NULL); - tailcallPtr = TOP_CB(interp); - TOP_CB(interp) = tailcallPtr->nextPtr; - iPtr->varFramePtr->tailcallPtr = tailcallPtr; + TclListObjSetElement(interp, listPtr, 0, nsObjPtr); + + iPtr->varFramePtr->tailcallPtr = listPtr; } return TCL_RETURN; } @@ -8364,12 +8384,14 @@ TclNRTailcallEval( int result) { Interp *iPtr = (Interp *) interp; - Tcl_Obj *listPtr = data[0]; - Tcl_Obj *nsObjPtr = data[1]; + Tcl_Obj *listPtr = data[0], *nsObjPtr; Tcl_Namespace *nsPtr; int objc; Tcl_Obj **objv; + Tcl_ListObjGetElements(interp, listPtr, &objc, &objv); + nsObjPtr = objv[0]; + if (result == TCL_OK) { result = TclGetNamespaceFromObj(interp, nsObjPtr, &nsPtr); } @@ -8388,10 +8410,10 @@ TclNRTailcallEval( * Perform the tailcall */ - TclNRDeferCallback(interp, TailcallCleanup, listPtr, nsObjPtr, NULL,NULL); + TclDeferCallbacks(interp, 0); + TclNRAddCallback(interp, TailcallCleanup, listPtr, NULL, NULL,NULL); iPtr->lookupNsPtr = (Namespace *) nsPtr; - ListObjGetElements(listPtr, objc, objv); - return TclNREvalObjv(interp, objc, objv, 0, NULL); + return TclNREvalObjv(interp, objc-1, objv+1, 0, NULL); } static int @@ -8401,19 +8423,9 @@ TailcallCleanup( int result) { Tcl_DecrRefCount((Tcl_Obj *) data[0]); - Tcl_DecrRefCount((Tcl_Obj *) data[1]); return result; } -static void -ClearTailcall( - Tcl_Interp *interp, - NRE_callback *tailcallPtr) -{ - TailcallCleanup(tailcallPtr->data, interp, TCL_OK); - TCLNR_FREE(interp, tailcallPtr); -} - void Tcl_NRAddCallback( @@ -8515,50 +8527,32 @@ TclNRYieldToObjCmd( * This is essentially code from TclNRTailcallObjCmd */ - listPtr = Tcl_NewListObj(objc-1, objv+1); - Tcl_IncrRefCount(listPtr); + /* + * Add the tailcall in the caller env, then just yield. + * + * This is essentially code from TclNRTailcallObjCmd + */ + + listPtr = Tcl_NewListObj(objc, objv); nsObjPtr = Tcl_NewStringObj(nsPtr->fullName, -1); if ((TCL_OK != TclGetNamespaceFromObj(interp, nsObjPtr, &ns1Ptr)) || (nsPtr != ns1Ptr)) { Tcl_Panic("yieldto failed to find the proper namespace"); } - Tcl_IncrRefCount(nsObjPtr); + TclListObjSetElement(interp, listPtr, 0, nsObjPtr); + /* * Add the callback in the caller's env, then instruct TEBC to yield. */ iPtr->execEnvPtr = corPtr->callerEEPtr; - TclNRAddCallback(interp, YieldToCallback, corPtr, listPtr, nsObjPtr, - NULL); + TclSetTailcall(interp, listPtr); iPtr->execEnvPtr = corPtr->eePtr; return TclNRYieldObjCmd(INT2PTR(CORO_ACTIVATE_YIELDM), interp, 1, objv); } - -static int -YieldToCallback( - ClientData data[], - Tcl_Interp *interp, - int result) -{ - /* CoroutineData *corPtr = data[0];*/ - Tcl_Obj *listPtr = data[1]; - ClientData nsPtr = data[2]; - NRE_callback *cbPtr; - - /* - * yieldTo: invoke the command using tailcall tech. - */ - - TclNRAddCallback(interp, TclNRTailcallEval, listPtr, nsPtr, NULL, NULL); - cbPtr = TOP_CB(interp); - TOP_CB(interp) = cbPtr->nextPtr; - - TclSpliceTailcall(interp, cbPtr); - return TCL_OK; -} static int RewindCoroutineCallback( diff --git a/generic/tclCompCmdsSZ.c b/generic/tclCompCmdsSZ.c index 1d04d8b..6e31481 100644 --- a/generic/tclCompCmdsSZ.c +++ b/generic/tclCompCmdsSZ.c @@ -1953,11 +1953,13 @@ TclCompileTailcallCmd( return TCL_ERROR; } + /* make room for the nsObjPtr */ + CompileWord(envPtr, tokenPtr, interp, 0); for (i=1 ; i<parsePtr->numWords ; i++) { tokenPtr = TokenAfter(tokenPtr); CompileWord(envPtr, tokenPtr, interp, i); } - TclEmitInstInt1( INST_TAILCALL, parsePtr->numWords-1, envPtr); + TclEmitInstInt1( INST_TAILCALL, parsePtr->numWords, envPtr); return TCL_OK; } diff --git a/generic/tclEnsemble.c b/generic/tclEnsemble.c index 9a2d598..2753876 100644 --- a/generic/tclEnsemble.c +++ b/generic/tclEnsemble.c @@ -1914,7 +1914,7 @@ NsEnsembleImplementationCmdNR( * Hand off to the target command. */ - iPtr->evalFlags |= TCL_EVAL_REDIRECT; + TclDeferCallbacks(interp, /* skip tailcalls */ 1); return TclNREvalObjEx(interp, copyPtr, TCL_EVAL_INVOKE, NULL,INT_MIN); } @@ -2122,7 +2122,7 @@ EnsembleUnknownCallback( */ Tcl_Preserve(ensemblePtr); - ((Interp *) interp)->evalFlags |= TCL_EVAL_REDIRECT; + TclDeferCallbacks (interp, /*skip tailcalls */ 1); result = Tcl_EvalObjv(interp, paramc, paramv, 0); if ((result == TCL_OK) && (ensemblePtr->flags & ENSEMBLE_DEAD)) { if (!Tcl_InterpDeleted(interp)) { diff --git a/generic/tclExecute.c b/generic/tclExecute.c index ade71f6..af60a95 100644 --- a/generic/tclExecute.c +++ b/generic/tclExecute.c @@ -2399,7 +2399,6 @@ TEBCresume( case INST_TAILCALL: { Tcl_Obj *listPtr, *nsObjPtr; - NRE_callback *tailcallPtr; opnd = TclGetUInt1AtPtr(pc+1); @@ -2433,18 +2432,12 @@ TEBCresume( listPtr = Tcl_NewListObj(opnd, &OBJ_AT_DEPTH(opnd-1)); nsObjPtr = Tcl_NewStringObj(iPtr->varFramePtr->nsPtr->fullName, -1); - Tcl_IncrRefCount(listPtr); - Tcl_IncrRefCount(nsObjPtr); - TclNRAddCallback(interp, TclNRTailcallEval, listPtr, nsObjPtr, - NULL, NULL); - - /* - * Unstitch ourselves and do a [return]. - */ + TclListObjSetElement(interp, listPtr, 0, nsObjPtr); + if (iPtr->varFramePtr->tailcallPtr) { + Tcl_DecrRefCount(iPtr->varFramePtr->tailcallPtr); + } + iPtr->varFramePtr->tailcallPtr = listPtr; - tailcallPtr = TOP_CB(interp); - TOP_CB(interp) = tailcallPtr->nextPtr; - iPtr->varFramePtr->tailcallPtr = tailcallPtr; result = TCL_RETURN; cleanup = opnd; goto processExceptionReturn; @@ -3054,8 +3047,9 @@ TEBCresume( DECACHE_STACK_INFO(); pc += 6; TEBC_YIELD(); + TclNRAddCallback(interp, TclClearRootEnsemble, NULL,NULL,NULL,NULL); - iPtr->evalFlags |= TCL_EVAL_REDIRECT; + TclDeferCallbacks(interp, /*skip tailcalls */ 1); return TclNREvalObjEx(interp, objPtr, TCL_EVAL_INVOKE, NULL, INT_MIN); /* diff --git a/generic/tclInt.h b/generic/tclInt.h index 537afb3..6cf594e 100644 --- a/generic/tclInt.h +++ b/generic/tclInt.h @@ -1154,7 +1154,7 @@ typedef struct CallFrame { * meaning of the value is, which we do not * specify. */ LocalCache *localCachePtr; - struct NRE_callback *tailcallPtr; + Tcl_Obj *tailcallPtr; /* NULL if no tailcall is scheduled */ } CallFrame; @@ -2250,7 +2250,6 @@ typedef struct InterpList { #define TCL_ALLOW_EXCEPTIONS 4 #define TCL_EVAL_FILE 2 #define TCL_EVAL_CTX 8 -#define TCL_EVAL_REDIRECT 16 /* * Flag bits for Interp structures: @@ -2805,8 +2804,8 @@ MODULE_SCOPE Tcl_ObjCmdProc TclNRYieldObjCmd; MODULE_SCOPE Tcl_ObjCmdProc TclNRYieldmObjCmd; MODULE_SCOPE Tcl_ObjCmdProc TclNRYieldToObjCmd; -MODULE_SCOPE void TclSpliceTailcall(Tcl_Interp *interp, - struct NRE_callback *tailcallPtr); +MODULE_SCOPE void TclSetTailcall(Tcl_Interp *interp, Tcl_Obj *tailcallPtr); +MODULE_SCOPE void TclDeferCallbacks(Tcl_Interp *interp, int skipTailcall); /* * This structure holds the data for the various iteration callbacks used to @@ -4808,35 +4807,6 @@ typedef struct NRE_callback { TOP_CB(interp) = callbackPtr; \ } while (0) -#define TclNRDeferCallback(interp,postProcPtr,data0,data1,data2,data3) \ - do { \ - NRE_callback *callbackPtr; \ - TCLNR_ALLOC((interp), (callbackPtr)); \ - callbackPtr->procPtr = (postProcPtr); \ - callbackPtr->data[0] = (ClientData)(data0); \ - callbackPtr->data[1] = (ClientData)(data1); \ - callbackPtr->data[2] = (ClientData)(data2); \ - callbackPtr->data[3] = (ClientData)(data3); \ - callbackPtr->nextPtr = ((Interp *)interp)->deferredCallbacks; \ - ((Interp *)interp)->deferredCallbacks = callbackPtr; \ - } while (0) - -#define TclNRSpliceCallbacks(interp, topPtr) \ - do { \ - NRE_callback *bottomPtr = topPtr; \ - while (bottomPtr->nextPtr) { \ - bottomPtr = bottomPtr->nextPtr; \ - } \ - bottomPtr->nextPtr = TOP_CB(interp); \ - TOP_CB(interp) = topPtr; \ - } while (0) - -#define TclNRSpliceDeferred(interp) \ - if (((Interp *)interp)->deferredCallbacks) { \ - TclNRSpliceCallbacks(interp, ((Interp *)interp)->deferredCallbacks); \ - ((Interp *)interp)->deferredCallbacks = NULL; \ - } - #if NRE_USE_SMALL_ALLOC #define TCLNR_ALLOC(interp, ptr) \ TclSmallAllocEx(interp, sizeof(NRE_callback), (ptr)) diff --git a/generic/tclInterp.c b/generic/tclInterp.c index 0b0f652..2e90caf 100644 --- a/generic/tclInterp.c +++ b/generic/tclInterp.c @@ -1798,9 +1798,9 @@ AliasNRCmd( */ if (isRootEnsemble) { - TclNRDeferCallback(interp, TclClearRootEnsemble, NULL, NULL, NULL, NULL); + TclNRAddCallback(interp, TclClearRootEnsemble, NULL, NULL, NULL, NULL); } - iPtr->evalFlags |= TCL_EVAL_REDIRECT; + TclDeferCallbacks(interp, /* skip tailcalls */ 1); return Tcl_NREvalObj(interp, listPtr, flags); } diff --git a/generic/tclNamesp.c b/generic/tclNamesp.c index 8da4b42..ee8aaa6 100644 --- a/generic/tclNamesp.c +++ b/generic/tclNamesp.c @@ -423,7 +423,7 @@ Tcl_PopCallFrame( framePtr->nsPtr = NULL; if (framePtr->tailcallPtr) { - TclSpliceTailcall(interp, framePtr->tailcallPtr); + TclSetTailcall(interp, framePtr->tailcallPtr); } } @@ -1945,7 +1945,7 @@ InvokeImportedNRCmd( ImportedCmdData *dataPtr = clientData; Command *realCmdPtr = dataPtr->realCmdPtr; - ((Interp *) interp)->evalFlags |= TCL_EVAL_REDIRECT; + TclDeferCallbacks(interp, /* skip tailcalls */ 1); return Tcl_NRCmdSwap(interp, (Tcl_Command) realCmdPtr, objc, objv, 0); } |