/* * nsfStack.c -- * * Stack handling functions of the Next Scripting Framework. * * Copyright (C) 2010-2017 Gustaf Neumann * Copyright (C) 2011-2017 Stefan Sobernig * * Vienna University of Economics and Business * Institute of Information Systems and New Media * A-1020, Welthandelsplatz 1 * Vienna, Austria * * This work is licensed under the MIT License https://www.opensource.org/licenses/MIT * * Copyright: * * Permission is hereby granted, free of charge, to any person obtaining a * copy of this software and associated documentation files (the "Software"), * to deal in the Software without restriction, including without limitation * the rights to use, copy, modify, merge, publish, distribute, sublicense, * and/or sell copies of the Software, and to permit persons to whom the * Software is furnished to do so, subject to the following conditions: * * The above copyright notice and this permission notice shall be included in * all copies or substantial portions of the Software. * * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER * DEALINGS IN THE SOFTWARE. */ /* * Static functions defined in this file. */ static void Nsf_PushFrameObj( Tcl_Interp *interp, NsfObject *object, const CallFrame *framePtr ) nonnull(1) nonnull(2) nonnull(3); static void Nsf_PopFrameObj(Tcl_Interp *interp, CallFrame *framePtr) nonnull(1) nonnull(2); NSF_INLINE static void Nsf_PushFrameCsc( Tcl_Interp *interp, const NsfCallStackContent *cscPtr, CallFrame *framePtr ) nonnull(1) nonnull(2) nonnull(3); static void Nsf_PopFrameCsc(Tcl_Interp *interp, CallFrame *UNUSED(framePtr)) nonnull(1); static Tcl_CallFrame* CallStackGetActiveProcFrame(Tcl_CallFrame *framePtr) nonnull(1) pure; NSF_INLINE static NsfObject* GetSelfObj2( const Tcl_Interp *UNUSED(interp), Tcl_CallFrame *framePtr ) nonnull(2) pure; static Tcl_CallFrame* CallStackGetTclFrame( const Tcl_Interp *interp, Tcl_CallFrame *varFramePtr, int skip ) nonnull(1) pure; static NsfCallStackContent* CallStackGetTopFrame( const Tcl_Interp *interp, Tcl_CallFrame **framePtrPtr ) nonnull(1); NSF_INLINE static NsfCallStackContent* CallStackGetTopFrame0(const Tcl_Interp *interp) nonnull(1) pure; static NsfCallStackContent* NsfCallStackFindCallingContext( const Tcl_Interp *interp, int offset, Tcl_CallFrame **callingProcFramePtrPtr, Tcl_CallFrame **callingFramePtrPtr ) nonnull(1); static NsfCallStackContent* NsfCallStackFindActiveFrame( const Tcl_Interp *interp, int offset, Tcl_CallFrame **framePtrPtr ) nonnull(1); static void CallStackUseActiveFrame( const Tcl_Interp *interp, callFrameContext *ctx ) nonnull(1) nonnull(2); static void CallStackRestoreSavedFrames( Tcl_Interp *interp, const callFrameContext *ctx ) nonnull(1) nonnull(2); static NsfCallStackContent* CallStackFindActiveFilter(const Tcl_Interp *interp) nonnull(1) pure; static NsfCallStackContent* CallStackFindEnsembleCsc( const Tcl_CallFrame *framePtr, Tcl_CallFrame **framePtrPtr ) nonnull(1) nonnull(2); static Tcl_CallFrame* CallStackNextFrameOfType( Tcl_CallFrame *framePtr, unsigned int flags ) nonnull(1); static Tcl_Obj* CallStackMethodPath(Tcl_Interp *interp, Tcl_CallFrame *framePtr) nonnull(1) nonnull(2); NSF_INLINE static int FilterActiveOnObj( const Tcl_Interp *interp, const NsfObject *object, const Tcl_Command cmd ) nonnull(1) nonnull(2) pure; static void CallStackReplaceVarTableReferences( const Tcl_Interp *interp, TclVarHashTable *oldVarTablePtr, TclVarHashTable *newVarTablePtr ) nonnull(1) nonnull(2) nonnull(3); #if defined(NRE) static NsfCallStackContent* CscAlloc( Tcl_Interp *interp, NsfCallStackContent *cscPtr, const Tcl_Command cmd ) nonnull(1); #else static NsfCallStackContent* CscAlloc( Tcl_Interp *interp, NsfCallStackContent *cscPtr, const Tcl_Command cmd ) nonnull(2); #endif NSF_INLINE static void CscInit_( NsfCallStackContent *cscPtr, NsfObject *object, NsfClass *class, const Tcl_Command cmd, unsigned short frameType, unsigned int flags ) nonnull(1) nonnull(2); NSF_INLINE static void CscFinish_(Tcl_Interp *interp, NsfCallStackContent *cscPtr) nonnull(1) nonnull(2); #ifdef CHECK_ACTIVATION_COUNTS static NsfClasses * NsfClassListUnlink(NsfClasses **firstPtrPtr, const void *key); /* *---------------------------------------------------------------------- * CscListAdd -- * * Add an entry to the list of unstacked CSC entries. * * Results: * none * * Side effects: * List element added * *---------------------------------------------------------------------- */ static int CscListRemove(const Tcl_Interp *interp, const NsfCallStackContent *cscPtr, NsfClasses **cscListPtr) nonnull(1) nonnull(2); static void CscListAdd(const Tcl_Interp *interp, const NsfCallStackContent *cscPtr) nonnull(1) nonnull(2); static void CscListAdd(const Tcl_Interp *interp, const NsfCallStackContent *cscPtr) { nonnull_assert(interp != NULL); nonnull_assert(cscPtr != NULL); NsfClassListAdd(&RUNTIME_STATE(interp)->cscList, (NsfClass *)cscPtr, NULL); } /* *---------------------------------------------------------------------- * CscListRemove -- * * Removes an entry from the list of unstacked CSC entries. * * Results: * true on success or 0 * * Side effects: * * List element potentially removed and freed. If a list turns * empty, the interp's state is updated. * *---------------------------------------------------------------------- */ static int CscListRemove(const Tcl_Interp *interp, const NsfCallStackContent *cscPtr, NsfClasses **cscListPtr) { NsfClasses *entryPtr, **cscList = &RUNTIME_STATE(interp)->cscList; nonnull_assert(interp != NULL); nonnull_assert(cscPtr != NULL); entryPtr = NsfClassListUnlink(cscList, cscPtr); if (entryPtr != NULL) { FREE(NsfClasses, entryPtr); } if (cscListPtr != NULL) { *cscListPtr = *cscList; } return (entryPtr != NULL); } #endif /* *---------------------------------------------------------------------- * NsfShowStack -- * * Print the contents of the call-stack to stderr. This function is * for debugging purposes only. * * Results: * None. * * Side effects: * Output on stderr. * *---------------------------------------------------------------------- */ void NsfShowStack(Tcl_Interp *interp) { Tcl_CallFrame *framePtr; nonnull_assert(interp != NULL); fprintf(stderr, "NsfShowStack framePtr %p varFramePtr %p\n", (void *)Tcl_Interp_framePtr(interp), (void *)Tcl_Interp_varFramePtr(interp)); /* framePtr = (Tcl_CallFrame *)Tcl_Interp_varFramePtr(interp); for (; framePtr != NULL; framePtr = Tcl_CallFrame_callerPtr(framePtr)) { fprintf(stderr, "... frame %p flags %.6x cd %p objv[0] %s\n", framePtr, Tcl_CallFrame_isProcCallFrame(framePtr), Tcl_CallFrame_clientData(framePtr), Tcl_CallFrame_objc(framePtr) ? ObjStr(Tcl_CallFrame_objv(framePtr)[0]) : "(null)"); }*/ framePtr = (Tcl_CallFrame *)Tcl_Interp_framePtr(interp); fprintf(stderr, "... varFrame flags clientData lvl ns\n"); for (; framePtr != NULL; framePtr = Tcl_CallFrame_callerPtr(framePtr)) { unsigned int frameFlags = (unsigned int)Tcl_CallFrame_isProcCallFrame(framePtr); NsfCallStackContent *cscPtr = (frameFlags & (FRAME_IS_NSF_METHOD|FRAME_IS_NSF_CMETHOD)) ? ((NsfCallStackContent *)Tcl_CallFrame_clientData(framePtr)) : NULL; fprintf(stderr, "... %16p %.6x %16p %3d %16p %s ov %s %d", (void *)framePtr, frameFlags, Tcl_CallFrame_clientData(framePtr), Tcl_CallFrame_level(framePtr), (void *)Tcl_CallFrame_nsPtr(framePtr), Tcl_CallFrame_nsPtr(framePtr)->fullName, Tcl_CallFrame_objc(framePtr) > 0 ? ObjStr(Tcl_CallFrame_objv(framePtr)[0]) : "(null)", Tcl_CallFrame_objc(framePtr) > 0 ? Tcl_CallFrame_objc(framePtr) : -1); if (cscPtr != NULL) { fprintf(stderr, " csc %p frameType %.4x flags %.6x (%s.%p %s)\n", (void *)cscPtr, cscPtr->frameType, cscPtr->flags, ObjectName(cscPtr->self), (void *)cscPtr->cmdPtr, Tcl_GetCommandName(interp, cscPtr->cmdPtr)); } else { fprintf(stderr, " no csc"); if (frameFlags & FRAME_IS_NSF_OBJECT) { NsfObject *object = (NsfObject *)Tcl_CallFrame_clientData(framePtr); fprintf(stderr, " obj %p %s", (void *)object, ObjectName(object)); } fprintf(stderr, "\n"); } } } /* * Push and pop operations. * * Note that it is possible that between push and pop * a object->nsPtr can be created (e.g. during a read trace) */ /* *---------------------------------------------------------------------- * Nsf_PushFrameObj, Nsf_PopFrameObj -- * * Push or pop a frame with a call-stack content as an OBJECT * frame. * * Results: * None. * * Side effects: * None. * *---------------------------------------------------------------------- */ static void Nsf_PushFrameObj(Tcl_Interp *interp, NsfObject *object, const CallFrame *framePtr) { nonnull_assert(interp != NULL); nonnull_assert(object != NULL); nonnull_assert(framePtr != NULL); /*fprintf(stderr,"PUSH OBJECT_FRAME (Nsf_PushFrameObj) frame %p\n", framePtr);*/ if (object->nsPtr != NULL) { Tcl_PushCallFrame(interp, (Tcl_CallFrame *)framePtr, object->nsPtr, 0|FRAME_IS_NSF_OBJECT); } else { /* The object has no nsPtr, so we disguise as a proc, using fakeProc */ Tcl_PushCallFrame(interp, (Tcl_CallFrame *)framePtr, Tcl_CallFrame_nsPtr(Tcl_Interp_varFramePtr(interp)), FRAME_IS_PROC|FRAME_IS_NSF_OBJECT); Tcl_CallFrame_procPtr(framePtr) = &RUNTIME_STATE(interp)->fakeProc; if (unlikely(object->varTablePtr == NULL)) { object->varTablePtr = VarHashTableCreate(); } Tcl_CallFrame_varTablePtr(framePtr) = object->varTablePtr; } Tcl_CallFrame_clientData(framePtr) = (ClientData)object; } static void Nsf_PopFrameObj(Tcl_Interp *interp, CallFrame *framePtr) { nonnull_assert(interp != NULL); nonnull_assert(framePtr != NULL); /*fprintf(stderr,"POP OBJECT_FRAME (Nsf_PopFrameObj) frame %p, varTable %p set to NULL, already %d\n", framePtr, Tcl_CallFrame_varTablePtr(framePtr), Tcl_CallFrame_varTablePtr(framePtr) == NULL);*/ Tcl_CallFrame_varTablePtr(framePtr) = NULL; Tcl_PopCallFrame(interp); } /* *---------------------------------------------------------------------- * Nsf_PushFrameCsc, Nsf_PopFrameCsc -- * * Push or pop a frame with a call-stack content as a CMETHOD * frame. * * Results: * None. * * Side effects: * None. * *---------------------------------------------------------------------- */ NSF_INLINE static void Nsf_PushFrameCsc(Tcl_Interp *interp, const NsfCallStackContent *cscPtr, CallFrame *framePtr) { CallFrame *varFramePtr = Tcl_Interp_varFramePtr(interp); nonnull_assert(interp != NULL); nonnull_assert(cscPtr != NULL); nonnull_assert(framePtr != NULL); /*fprintf(stderr,"PUSH CMETHOD_FRAME (Nsf_PushFrameCsc) frame %p cscPtr %p methodName %s\n", framePtr, cscPtr, Tcl_GetCommandName(interp, cscPtr->cmdPtr));*/ Tcl_PushCallFrame(interp, (Tcl_CallFrame *)framePtr, Tcl_CallFrame_nsPtr(varFramePtr), FRAME_IS_PROC|FRAME_IS_NSF_CMETHOD); Tcl_CallFrame_clientData(framePtr) = (ClientData)cscPtr; Tcl_CallFrame_procPtr(framePtr) = &RUNTIME_STATE(interp)->fakeProc; } NSF_INLINE static void Nsf_PopFrameCsc(Tcl_Interp *interp, CallFrame *UNUSED(framePtr)) { nonnull_assert(interp != NULL); /*fprintf(stderr,"POP CMETHOD_FRAME (Nsf_PopFrameCsc) frame %p, varTablePtr = %p\n", framePtr, Tcl_CallFrame_varTablePtr(framePtr));*/ Tcl_PopCallFrame(interp); } /* * stack query operations */ /* *---------------------------------------------------------------------- * CallStackGetActiveProcFrame -- * * Return the Tcl call frame of the last scripted method. * * Results: * Tcl_CallFrame * * Side effects: * None. * *---------------------------------------------------------------------- */ static Tcl_CallFrame * CallStackGetActiveProcFrame(Tcl_CallFrame *framePtr) { nonnull_assert(framePtr != NULL); do { register unsigned int flag = (unsigned int)Tcl_CallFrame_isProcCallFrame(framePtr); if ((flag & (FRAME_IS_NSF_METHOD|FRAME_IS_NSF_CMETHOD)) != 0) { /* never return an inactive method frame */ if (likely(!(((NsfCallStackContent *)Tcl_CallFrame_clientData(framePtr))->frameType & NSF_CSC_TYPE_INACTIVE))) { break; } } else { if (likely((flag & (FRAME_IS_NSF_OBJECT)) == 0u)) { if (flag == 0 || (flag & FRAME_IS_PROC) != 0) { break; } } } framePtr = Tcl_CallFrame_callerPtr(framePtr); } while (framePtr != NULL); return framePtr; } /* *---------------------------------------------------------------------- * GetSelfObj, GetSelfObj2 -- * * Return the corresponding object from a method or from an object * frame. GetSelfObj defaults to the top-most call-frame, GetSelfObj2 allows * one to set another frame. * * Results: * NsfObject * or NULL. * * Side effects: * None. * *---------------------------------------------------------------------- */ #define SKIP_LEVELS 1 #define SKIP_LAMBDA 1 #if defined(SKIP_LAMBDA) # if !defined(SKIP_LEVELS) # define SKIP_LEVELS 1 # endif #endif #define GetSelfObj(interp) \ GetSelfObj2((interp), (Tcl_CallFrame *)Tcl_Interp_varFramePtr((interp))) NSF_INLINE static NsfObject* GetSelfObj2(const Tcl_Interp *UNUSED(interp), Tcl_CallFrame *framePtr) { register Tcl_CallFrame *varFramePtr; nonnull_assert(framePtr != NULL); /*fprintf(stderr, "GetSelfObj interp has frame %p and var-frame %p\n", Tcl_Interp_framePtr(interp), Tcl_Interp_varFramePtr(interp));*/ for (varFramePtr = framePtr; varFramePtr != NULL; varFramePtr = #if defined(SKIP_LEVELS) Tcl_CallFrame_callerPtr(varFramePtr) #else NULL #endif ) { register unsigned int flags; flags = (unsigned int)Tcl_CallFrame_isProcCallFrame(varFramePtr); if (likely((flags & (FRAME_IS_NSF_METHOD|FRAME_IS_NSF_CMETHOD)) != 0u)) { return ((NsfCallStackContent *)Tcl_CallFrame_clientData(varFramePtr))->self; } else if ((flags & FRAME_IS_NSF_OBJECT) != 0u) { return (NsfObject *)Tcl_CallFrame_clientData(varFramePtr); } #if defined(SKIP_LAMBDA) if ((flags & FRAME_IS_LAMBDA) != 0u) { continue; } break; #endif } return NULL; } /* *---------------------------------------------------------------------- * CallStackGetTclFrame -- * * Return the Tcl_Callframe a (scripted or non-leaf) method starting with * the specified or topmost frame; if skip is a positive number the * specified number of Tcl frames are skipped. * * Results: * Tcl_CallFrame or NULL. * * Side effects: * None. * *---------------------------------------------------------------------- */ static Tcl_CallFrame* CallStackGetTclFrame(const Tcl_Interp *interp, Tcl_CallFrame *varFramePtr, int skip) { nonnull_assert(interp != NULL); assert(skip >= 0); /* NsfShowStack(interp); */ if (varFramePtr == NULL) { varFramePtr = (Tcl_CallFrame *)Tcl_Interp_varFramePtr(interp); } while(skip-- && varFramePtr != NULL) { varFramePtr = Tcl_CallFrame_callerPtr(varFramePtr); } for (; varFramePtr != NULL; varFramePtr = Tcl_CallFrame_callerPtr(varFramePtr)) { if (((unsigned int)Tcl_CallFrame_isProcCallFrame(varFramePtr) & (FRAME_IS_NSF_METHOD|FRAME_IS_NSF_CMETHOD)) != 0u) { return varFramePtr; } } return NULL; } /* *---------------------------------------------------------------------- * CallStackGetTopFrame, CallStackGetTopFrame0, NsfCallStackGetTopFrame -- * * Return the NsfCallStackContent* of the topmost invocation of a (scripted * or non-leaf) method. If framePtrPtr is provided, it is used to return the * Tcl frame as well. * * Results: * Call stack content or NULL. * * Side effects: * None. * *---------------------------------------------------------------------- */ static NsfCallStackContent* CallStackGetTopFrame(const Tcl_Interp *interp, Tcl_CallFrame **framePtrPtr) { register Tcl_CallFrame *varFramePtr; nonnull_assert(interp != NULL); for (varFramePtr = (Tcl_CallFrame *)Tcl_Interp_varFramePtr(interp); varFramePtr != NULL; varFramePtr = Tcl_CallFrame_callerPtr(varFramePtr)) { if (((unsigned int)Tcl_CallFrame_isProcCallFrame(varFramePtr) & (FRAME_IS_NSF_METHOD|FRAME_IS_NSF_CMETHOD)) != 0u) { if (framePtrPtr != NULL) { *framePtrPtr = varFramePtr; } return (NsfCallStackContent *)Tcl_CallFrame_clientData(varFramePtr); } } if (framePtrPtr != NULL) { *framePtrPtr = NULL; } return NULL; } NSF_INLINE static NsfCallStackContent* CallStackGetTopFrame0(const Tcl_Interp *interp) { register Tcl_CallFrame *varFramePtr; NsfCallStackContent *result = NULL; nonnull_assert(interp != NULL); for (varFramePtr = (Tcl_CallFrame *)Tcl_Interp_varFramePtr(interp); varFramePtr != NULL; varFramePtr = Tcl_CallFrame_callerPtr(varFramePtr)) { if (likely(((unsigned int)Tcl_CallFrame_isProcCallFrame(varFramePtr) & (FRAME_IS_NSF_METHOD|FRAME_IS_NSF_CMETHOD)) != 0u)) { result = (NsfCallStackContent *)Tcl_CallFrame_clientData(varFramePtr); break; } } return result; } #if defined(NSF_PROFILE) NsfCallStackContent* NsfCallStackGetTopFrame(const Tcl_Interp *interp, Tcl_CallFrame **framePtrPtr) nonnull(1); NsfCallStackContent* NsfCallStackGetTopFrame(const Tcl_Interp *interp, Tcl_CallFrame **framePtrPtr) { return CallStackGetTopFrame(interp, framePtrPtr); } #endif /* *---------------------------------------------------------------------- * NsfCallStackFindCallingContext -- * NsfCallStackFindLastInvocation -- * * Find the calling context (frame) with a specified offset. Find the * frame corresponding to the calling proc or (scripted or non-leaf) * method. * * Results: * Call stack content (for NSF methods) or NULL. * * Side effects: * None. * *---------------------------------------------------------------------- */ static NsfCallStackContent * NsfCallStackFindCallingContext(const Tcl_Interp *interp, int offset, Tcl_CallFrame **callingProcFramePtrPtr, Tcl_CallFrame **callingFramePtrPtr) { register Tcl_CallFrame *varFramePtr = (Tcl_CallFrame *)Tcl_Interp_varFramePtr(interp); int lvl = Tcl_CallFrame_level(varFramePtr); nonnull_assert(interp != NULL); for (; likely(varFramePtr != NULL); varFramePtr = Tcl_CallFrame_callerVarPtr(varFramePtr)) { register unsigned int flags = (unsigned int)Tcl_CallFrame_isProcCallFrame(varFramePtr); if (flags != 0u) { /* * A proc frame */ NsfCallStackContent *cscPtr = (flags & (FRAME_IS_NSF_METHOD|FRAME_IS_NSF_CMETHOD)) ? ((NsfCallStackContent *)Tcl_CallFrame_clientData(varFramePtr)) : NULL; if (cscPtr != NULL) { /* * An NSF method frame. */ if ((cscPtr->flags & (NSF_CSC_CALL_IS_NEXT|NSF_CSC_CALL_IS_ENSEMBLE)) || (cscPtr->frameType & NSF_CSC_TYPE_INACTIVE)) { continue; } } if (offset != 0) { offset--; } else if (Tcl_CallFrame_level(varFramePtr) < lvl) { if (callingProcFramePtrPtr != NULL) { *callingProcFramePtrPtr = varFramePtr; } return cscPtr; } } else if (callingFramePtrPtr != NULL && *callingFramePtrPtr == NULL && Tcl_CallFrame_level(varFramePtr) < lvl) { *callingFramePtrPtr = varFramePtr; } } if (callingProcFramePtrPtr != NULL) { *callingProcFramePtrPtr = NULL; } return NULL; } /* *---------------------------------------------------------------------- * NsfCallStackFindActiveFrame -- * * Search for the first active frame on the call-stack. * * Results: * Call stack content or NULL. * * Side effects: * None. * *---------------------------------------------------------------------- */ static NsfCallStackContent * NsfCallStackFindActiveFrame(const Tcl_Interp *interp, int offset, Tcl_CallFrame **framePtrPtr) { register Tcl_CallFrame *varFramePtr; nonnull_assert(interp != NULL); /* skip #offset frames */ for (varFramePtr = (Tcl_CallFrame *)Tcl_Interp_varFramePtr(interp); (offset > 0) && (varFramePtr != NULL); varFramePtr = Tcl_CallFrame_callerPtr(varFramePtr), offset--); /* search for first active frame and set Tcl frame pointers */ for (; varFramePtr != NULL; varFramePtr = Tcl_CallFrame_callerPtr(varFramePtr)) { if (((unsigned int)Tcl_CallFrame_isProcCallFrame(varFramePtr) & (FRAME_IS_NSF_METHOD|FRAME_IS_NSF_CMETHOD)) != 0u) { NsfCallStackContent *cscPtr = (NsfCallStackContent *)Tcl_CallFrame_clientData(varFramePtr); if (!(cscPtr->frameType & NSF_CSC_TYPE_INACTIVE)) { /* we found the highest active frame */ if (framePtrPtr != NULL) { *framePtrPtr = varFramePtr; } return cscPtr; } } } /* we could not find an active frame; called from toplevel? */ if (framePtrPtr != NULL) { *framePtrPtr = NULL; } return NULL; } /* *---------------------------------------------------------------------- * CallStackUseActiveFrame -- * * Activate the varFrame of the first active non-object frame and * save the previously active frames in the call frame context. * These stored frames are typically reactivated by * CallStackRestoreSavedFrames(). * * Results: * None. * * Side effects: * The varFramePtr of the interp is potentially updated * *---------------------------------------------------------------------- */ static void CallStackUseActiveFrame(const Tcl_Interp *interp, callFrameContext *ctx) { Tcl_CallFrame *framePtr, *inFramePtr; nonnull_assert(interp != NULL); nonnull_assert(ctx != NULL); inFramePtr = (Tcl_CallFrame *)Tcl_Interp_varFramePtr(interp); /* Get the first active non object frame */ framePtr = CallStackGetActiveProcFrame(inFramePtr); /*fprintf(stderr,"... use frameptr %p \n", framePtr);*/ if (inFramePtr == framePtr) { /* call frame pointers are fine */ ctx->frameSaved = NSF_FALSE; } else { ctx->varFramePtr = inFramePtr; /*fprintf(stderr, "CallStackUseActiveFrame stores %p\n", framePtr);*/ Tcl_Interp_varFramePtr(interp) = (CallFrame *)framePtr; ctx->frameSaved = NSF_TRUE; } } /* *---------------------------------------------------------------------- * CallStackRestoreSavedFrames -- * * Restore the previously saved frames from the specified call * frame context. These frames are typically saved by * CallStackUseActiveFrame(). * * Results: * None. * * Side effects: * The varFramePtr of the interp is potentially updated * *---------------------------------------------------------------------- */ static void CallStackRestoreSavedFrames(Tcl_Interp *interp, const callFrameContext *ctx) { nonnull_assert(interp != NULL); nonnull_assert(ctx != NULL); if (ctx->frameSaved) { /*fprintf(stderr, "CallStackRestoreSavedFrames drops %p restores %p\n", Tcl_Interp_varFramePtr(interp), ctx->varFramePtr);*/ Tcl_Interp_varFramePtr(interp) = (CallFrame *)ctx->varFramePtr; } } /* *---------------------------------------------------------------------- * CallStackFindActiveFilter -- * * Return the call-stack content of the currently active filter * * Results: * Call-stack content or NULL, if no filter is active * * Side effects: * None. * *---------------------------------------------------------------------- */ static NsfCallStackContent * CallStackFindActiveFilter(const Tcl_Interp *interp) { register const Tcl_CallFrame *varFramePtr = (Tcl_CallFrame *)Tcl_Interp_varFramePtr(interp); nonnull_assert(interp != NULL); for (; varFramePtr != NULL; varFramePtr = Tcl_CallFrame_callerPtr(varFramePtr)) { if (((unsigned int)Tcl_CallFrame_isProcCallFrame(varFramePtr) & (FRAME_IS_NSF_METHOD|FRAME_IS_NSF_CMETHOD)) != 0u) { NsfCallStackContent *cscPtr = (NsfCallStackContent *)Tcl_CallFrame_clientData(varFramePtr); if (cscPtr->frameType == NSF_CSC_TYPE_ACTIVE_FILTER) { return cscPtr; } } } /* for some reasons, we could not find invocation (topLevel, destroy) */ return NULL; } /* *---------------------------------------------------------------------- * CallStackFindEnsembleCsc -- * * Return the call-stack content and the optionally the stack frame * of the last ensemble invocation. * * Results: * Call-stack content * * Side effects: * None. * *---------------------------------------------------------------------- */ static NsfCallStackContent * CallStackFindEnsembleCsc(const Tcl_CallFrame *framePtr, Tcl_CallFrame **framePtrPtr) { register Tcl_CallFrame *varFramePtr; NsfCallStackContent *cscPtr = NULL; nonnull_assert(framePtr != NULL); nonnull_assert(framePtrPtr != NULL); for (/* Skipping the starting frame, assuming a "leaf" frame in an ensemble dispatch */ varFramePtr = Tcl_CallFrame_callerPtr(framePtr); ((unsigned int)Tcl_CallFrame_isProcCallFrame(varFramePtr) & FRAME_IS_NSF_CMETHOD) != 0u; varFramePtr = Tcl_CallFrame_callerPtr(varFramePtr)) { cscPtr = (NsfCallStackContent *)Tcl_CallFrame_clientData(varFramePtr); assert(cscPtr != NULL); /*fprintf(stderr," --- frame %p cmdPtr %p NSF_CSC_TYPE_ENSEMBLE %d NSF_CSC_CALL_IS_ENSEMBLE %d \ NSF_CSC_TYPE_INACTIVE %d\n", varFramePtr, cscPtr->cmdPtr, (cscPtr->frameType & NSF_CSC_TYPE_ENSEMBLE) != 0, (cscPtr->flags & NSF_CSC_CALL_IS_ENSEMBLE) != 0, (cscPtr->frameType & NSF_CSC_TYPE_INACTIVE) != 0);*/ /* * The "root" frame in a call-stack branch resulting from an ensemble * dispatch is not typed as an NSF_CSC_TYPE_ENSEMBLE frame, the call type * /is/ NSF_CSC_CALL_IS_ENSEMBLE. */ if ((cscPtr->frameType & NSF_CSC_TYPE_ENSEMBLE) == 0u && (cscPtr->flags & NSF_CSC_CALL_IS_ENSEMBLE)) { break; } } *framePtrPtr = varFramePtr; return cscPtr; } /* *---------------------------------------------------------------------- * CallStackNextFrameOfType -- * * Return the next frame on the call stack being of a specified type. The * type is specified by a bitmask passed as flags. * * Results: * Tcl_CallFrame * * Side effects: * None. * *---------------------------------------------------------------------- */ static Tcl_CallFrame * CallStackNextFrameOfType(Tcl_CallFrame *framePtr, unsigned int flags) { nonnull_assert(framePtr != NULL); do { NsfCallStackContent *cscPtr = Tcl_CallFrame_clientData(framePtr); if (cscPtr != NULL && (cscPtr->frameType & NSF_CSC_TYPE_ENSEMBLE) != 0u) { (void)CallStackFindEnsembleCsc(framePtr, &framePtr); } if (((unsigned int)Tcl_CallFrame_isProcCallFrame(framePtr) & flags) != 0u) { /* * framePtr has already the return value. */ break; } framePtr = Tcl_CallFrame_callerPtr(framePtr); } while (framePtr != NULL); return framePtr; } /* *---------------------------------------------------------------------- * CallStackMethodPath -- * * Return the method path of the current ensemble in a Tcl_Obj with * refCount 0. * * Results: * Tcl_Obj containing the method path * * Side effects: * None. * *---------------------------------------------------------------------- */ static Tcl_Obj* CallStackMethodPath(Tcl_Interp *interp, Tcl_CallFrame *framePtr) { int elements; Tcl_Obj *resultObj, *methodPathObj = Tcl_NewListObj(0, NULL); nonnull_assert(interp != NULL); nonnull_assert(framePtr != NULL); /* * Append all ensemble names to the specified list obj */ for (elements = 0; ((unsigned int)Tcl_CallFrame_isProcCallFrame(framePtr) & (FRAME_IS_NSF_CMETHOD|FRAME_IS_NSF_METHOD)) != 0u; framePtr = Tcl_CallFrame_callerPtr(framePtr)) { const NsfCallStackContent *cscPtr = (NsfCallStackContent *)Tcl_CallFrame_clientData(framePtr); assert(cscPtr != NULL); /*fprintf(stderr, "--- frame %p cmdPtr %p cmd %s NSF_CSC_TYPE_ENSEMBLE %d \ NSF_CSC_CALL_IS_ENSEMBLE %d NSF_CSC_TYPE_INACTIVE %d\n", framePtr, cscPtr->cmdPtr, Tcl_GetCommandName(interp, cscPtr->cmdPtr), (cscPtr->frameType & NSF_CSC_TYPE_ENSEMBLE) != 0, (cscPtr->flags & NSF_CSC_CALL_IS_ENSEMBLE) != 0, (cscPtr->frameType & NSF_CSC_TYPE_INACTIVE) != 0);*/ /* * The "ensemble" call type, we find applied to all intermediate and leaf * ensemble frames. By filtering according to the ensemble call type, we * effectively omit leaf ensemble and non-ensemble frames from being * reported. */ if ((cscPtr->flags & NSF_CSC_CALL_IS_ENSEMBLE) == 0u) { break; } /* * The call-stack might contain consecutive calls of ensemble entry calls * chained via next. We can detect consecutive calls via the elements * count. */ if (elements == 0 && (cscPtr->flags & NSF_CM_ENSEMBLE_UNKNOWN) && (cscPtr->flags & NSF_CSC_CALL_IS_NEXT)) { break; } Tcl_ListObjAppendElement(interp, methodPathObj, Tcl_NewStringObj(Tcl_GetCommandName(interp, cscPtr->cmdPtr), -1)); elements++; /* * The "root" frame in a call-stack branch resulting from an ensemble * dispatch is not typed as an NSF_CSC_TYPE_ENSEMBLE frame, the call type * /is/ NSF_CSC_CALL_IS_ENSEMBLE (as checked above). */ if ((cscPtr->frameType & NSF_CSC_TYPE_ENSEMBLE) == 0u) { break; } } /* * The resulting list has reversed order. If there are multiple * arguments, reverse the list to obtain the right order. */ if (elements > 1) { int oc, i; Tcl_Obj **ov; INCR_REF_COUNT(methodPathObj); Tcl_ListObjGetElements(interp, methodPathObj, &oc, &ov); resultObj = Tcl_NewListObj(0, NULL); for (i = elements-1; i >= 0; i--) { Tcl_ListObjAppendElement(interp, resultObj, ov[i]); } DECR_REF_COUNT(methodPathObj); } else { resultObj = methodPathObj; } /*fprintf(stderr, "--- CallStackMethodPath returns %s\n", ObjStr(resultObj));*/ return resultObj; } /* *---------------------------------------------------------------------- * FilterActiveOnObj -- * * Check, if there is an active filter on "obj" using the specified * cmd. * * Results: * 0 or 1 * * Side effects: * None. * *---------------------------------------------------------------------- */ NSF_INLINE static int FilterActiveOnObj( const Tcl_Interp *interp, const NsfObject *object, const Tcl_Command cmd ) { register const Tcl_CallFrame *varFramePtr = (const Tcl_CallFrame *)Tcl_Interp_varFramePtr(interp); nonnull_assert(interp != NULL); nonnull_assert(object != NULL); for (; varFramePtr != NULL; varFramePtr = Tcl_CallFrame_callerPtr(varFramePtr)) { if (((unsigned int)Tcl_CallFrame_isProcCallFrame(varFramePtr) & (FRAME_IS_NSF_METHOD|FRAME_IS_NSF_CMETHOD)) != 0u) { NsfCallStackContent *cscPtr = (NsfCallStackContent *)Tcl_CallFrame_clientData(varFramePtr); if (cmd == cscPtr->cmdPtr && object == cscPtr->self && cscPtr->frameType == NSF_CSC_TYPE_ACTIVE_FILTER) { return 1; } } } return 0; } /* *---------------------------------------------------------------------- * CallStackReplaceVarTableReferences -- * * Replace all references to the old var table (arg 1) by * references to a new var table (arg 2) on the call-stack. * This function is e.g. used by require namespace. * * Results: * None. * * Side effects: * Updated stack. * *---------------------------------------------------------------------- */ static void CallStackReplaceVarTableReferences(const Tcl_Interp *interp, TclVarHashTable *oldVarTablePtr, TclVarHashTable *newVarTablePtr) { Tcl_CallFrame *framePtr; nonnull_assert(interp != NULL); nonnull_assert(oldVarTablePtr != NULL); nonnull_assert(newVarTablePtr != NULL); for (framePtr = (Tcl_CallFrame *)Tcl_Interp_framePtr(interp); framePtr != NULL; framePtr = Tcl_CallFrame_callerPtr(framePtr)) { unsigned int frameFlags = (unsigned int)Tcl_CallFrame_isProcCallFrame(framePtr); if ((frameFlags & FRAME_IS_NSF_OBJECT) == 0u) { continue; } if (!(Tcl_CallFrame_varTablePtr(framePtr) == oldVarTablePtr)) { continue; } /*fprintf(stderr, "+++ makeObjNamespace replacing varTable %p with %p in frame %p\n", oldVarTablePtr, newVarTablePtr, framePtr);*/ Tcl_CallFrame_varTablePtr(framePtr) = newVarTablePtr; } } /* *---------------------------------------------------------------------- * CallStackPopAll -- * * Unwind the stack and pop all call-stack entries that are still * alive (e.g. if "exit" is called and we were jumping out of the * call-frame). * * Results: * None. * * Side effects: * Updated stack. * *---------------------------------------------------------------------- */ static void CallStackPopAll(Tcl_Interp *interp) { nonnull_assert(interp != NULL); if (RUNTIME_STATE(interp)->logSeverity == NSF_LOG_DEBUG) { NsfShowStack(interp); } while (1) { const Tcl_CallFrame *framePtr = Tcl_Interp_framePtr(interp); unsigned int frameFlags; if (framePtr == NULL || (Tcl_CallFrame_level(framePtr) == 0)) { break; } frameFlags = (unsigned int)Tcl_CallFrame_isProcCallFrame(framePtr); /*fprintf(stderr, "--- popping %p frame-flags %.6x\n", framePtr, frameFlags);*/ if ((frameFlags & (FRAME_IS_NSF_METHOD|FRAME_IS_NSF_CMETHOD))) { /* free the call stack content; we need this just for decr activation count */ NsfCallStackContent *cscPtr = ((NsfCallStackContent *)Tcl_CallFrame_clientData(framePtr)); #if defined(NRE) /* Mask out IS_NRE, since Tcl_PopCallFrame takes care about TclStackFree */ cscPtr->flags &= ~NSF_CSC_CALL_IS_NRE; #endif CscFinish(interp, cscPtr, TCL_OK, "popall"); } else if (frameFlags & FRAME_IS_NSF_OBJECT) { Tcl_CallFrame_varTablePtr(framePtr) = NULL; } /* pop the Tcl frame */ Tcl_PopCallFrame(interp); } #if defined(CHECK_ACTIVATION_COUNTS) { int count = 0; NsfClasses *unstackedEntries = RUNTIME_STATE(interp)->cscList, *nextCscPtr = unstackedEntries; while (nextCscPtr != NULL) { NsfCallStackContent *cscPtr = (NsfCallStackContent *)nextCscPtr->cl; CscListRemove(interp, cscPtr, &unstackedEntries); CscFinish(interp, cscPtr, TCL_OK, "unwind"); count ++; nextCscPtr = (unstackedEntries != NULL) ? unstackedEntries->nextPtr : NULL; } if (count>0 && RUNTIME_STATE(interp)->logSeverity > 0) { fprintf(stderr, "+++ unwind removed %d unstacked csc entries\n", count); } } #endif } /* *---------------------------------------------------------------------- * CscAlloc -- * * Allocate the CSC structure either from the stack or via * StackAlloc (the latter is recorded in the callType). The Alloc * operation requires a CscFinish operation later. * * Results: * A valid, semi-initialized cscPtr. * * Side effects: * Memory allocation * *---------------------------------------------------------------------- */ static NsfCallStackContent * CscAlloc(Tcl_Interp *interp, NsfCallStackContent *cscPtr, const Tcl_Command cmd) { #if defined(NRE) Tcl_ObjCmdProc *proc = (cmd != NULL) ? Tcl_Command_objProc(cmd) : NULL; if (proc == TclObjInterpProc) { cscPtr = (NsfCallStackContent *) NsfTclStackAlloc(interp, sizeof(NsfCallStackContent), "csc"); cscPtr->flags = NSF_CSC_CALL_IS_NRE; } else { cscPtr->flags = 0; } #else nonnull_assert(cscPtr != NULL); (void)interp; (void)cmd; cscPtr->flags = 0; #endif /*fprintf(stderr, "CscAlloc allocated %p\n", cscPtr);*/ return cscPtr; } /* *---------------------------------------------------------------------- * CscInit -- * * Initialize call stack content and track activation counts * of involved objects and classes * * Results: * None. * * Side effects: * Initialized Csc, updated activation counts * *---------------------------------------------------------------------- */ NSF_INLINE static void CscInit_( NsfCallStackContent *cscPtr, NsfObject *object, NsfClass *class, const Tcl_Command cmd, unsigned short frameType, unsigned int flags ) { #if defined(NSF_PROFILE) struct Tcl_Time trt; #endif nonnull_assert(cscPtr != NULL); nonnull_assert(object != NULL); #if defined(NSF_PROFILE) Tcl_GetTime(&trt); cscPtr->startUsec = trt.usec; cscPtr->startSec = trt.sec; #endif /* * When cmd is provided, the call is not unknown, the method * will be executed and the object will be stacked. In these * cases, we maintain an activation count. */ if (likely(cmd != NULL)) { /* * Track object activations */ object->activationCount ++; MEM_COUNT_ALLOC("object.activationCount",object); /*fprintf(stderr, "CscInit %p method %s activationCount ++ (%s) --> %d (cl %p)\n", cscPtr, (cmd != NULL) ? Tcl_GetCommandName(object->teardown, cmd) : "UNK", ObjectName(object), object->activationCount, cl);*/ /* * Track class activations */ if (class != NULL) { /* * handle class activation count */ class->object.activationCount ++; MEM_COUNT_ALLOC("class.activationCount", class); /* * Increment the namespace ptr in case Tcl tries to delete * this namespace during the invocation */ NSNamespacePreserve(Tcl_Command_nsPtr(cmd)); /*fprintf(stderr, "NSNamespacePreserve %p\n", nsPtr);*/ } NsfCommandPreserve(cmd); } cscPtr->flags |= flags & NSF_CSC_COPY_FLAGS; cscPtr->self = object; cscPtr->cl = class; cscPtr->cmdPtr = cmd; cscPtr->objv = NULL; cscPtr->filterStackEntry = object->filterStack; cscPtr->frameType = frameType; /*fprintf(stderr, "CscInit %p (%s) object %p %s flags %.6x cmdPtr %p\n", cscPtr, msg, object, ObjectName(object), cscPtr->flags, cscPtr->cmdPtr);*/ } /* *---------------------------------------------------------------------- * CscFinish -- * * Counterpart of CscInit(). Decrement activation counts * and delete objects/classes if necessary. * * Results: * None. * * Side effects: * potentially deletes objects, classes or namespaces. * *---------------------------------------------------------------------- */ NSF_INLINE static void CscFinish_(Tcl_Interp *interp, NsfCallStackContent *cscPtr) { NsfObject *object; nonnull_assert(interp != NULL); nonnull_assert(cscPtr != NULL); assert(cscPtr->self != NULL); #if defined(NSF_PROFILE) if (RUNTIME_STATE(interp)->doProfile) { NsfProfileRecordMethodData(interp, cscPtr); } #endif object = cscPtr->self; /*fprintf(stderr, "CscFinish %p object %p %s flags %.6x cmdPtr %p\n", cscPtr, object, ObjectName(object), cscPtr->flags, cscPtr->cmdPtr); */ /* * In the cases, where an cmd was provided, we tracked in init the * activations. Release these activations now. Notem, that * cscPtr->cmdPtr might have been epoched, but it is still * available, since we used NsfCommandPreserve() in CscInit(). */ if (likely(cscPtr->cmdPtr != NULL)) { int allowDestroy = RUNTIME_STATE(interp)->exitHandlerDestroyRound == NSF_EXITHANDLER_OFF; if ((Tcl_Command_flags(cscPtr->cmdPtr) & NSF_CMD_DEBUG_METHOD) != 0) { #if defined(NSF_PROFILE) || defined(NSF_DTRACE) NsfProfileDebugExit(interp, cscPtr->self, cscPtr->cl, cscPtr->methodName, cscPtr->startSec, cscPtr->startUsec); #else NsfProfileDebugExit(interp, cscPtr->self, cscPtr->cl, Tcl_GetCommandName(interp, cscPtr->cmdPtr), 0, 0); #endif } /* * Track object activations */ object->activationCount --; MEM_COUNT_FREE("object.activationCount", object); /*fprintf(stderr, "CscFinish decr activationCount for %s to %d object->flags %.6x dc %.6x succ %.6x\n", ObjectName(cscPtr->self), cscPtr->self->activationCount, object->flags, object->flags & NSF_DESTROY_CALLED, object->flags & NSF_DESTROY_CALLED_SUCCESS );*/ assert(object->activationCount > -1); if (object->activationCount < 1 && (object->flags & NSF_DESTROY_CALLED) && allowDestroy) { /*fprintf(stderr, "CscFinish calls destroy object %p\n", object);*/ CallStackDoDestroy(interp, object); } /* * Track class activations */ if (unlikely(cscPtr->cl != NULL)) { NsfObject *clObject = &cscPtr->cl->object; clObject->activationCount --; MEM_COUNT_FREE("class.activationCount", clObject); /*fprintf(stderr, "CscFinish class %p %s check ac %d flags destroy %.6x success %.6x\n", clObject, ObjectName(clObject), clObject->activationCount, clObject->flags & NSF_DESTROY_CALLED, clObject->flags & NSF_DESTROY_CALLED_SUCCESS);*/ if (clObject->activationCount < 1 && clObject->flags & NSF_DESTROY_CALLED && allowDestroy) { /* fprintf(stderr, "CscFinish calls destroy class %p\n", clObject);*/ CallStackDoDestroy(interp, clObject); } /* * Release the Namespace */ NSNamespaceRelease(Tcl_Command_nsPtr(cscPtr->cmdPtr)); } /* * Release the Command */ NsfCommandRelease(cscPtr->cmdPtr); } #if defined(NRE) if ((cscPtr->flags & NSF_CSC_CALL_IS_NRE)) { NsfTclStackFree(interp, cscPtr, "CscFinish"); } #endif /*fprintf(stderr, "CscFinish done\n");*/ } /* *---------------------------------------------------------------------- * BeginOfCallChain -- * * Experimental function to track the begin of a call chain. * Currently not used. * * Results: * Callframe ptr * * Side effects: * None. * *---------------------------------------------------------------------- */ #if 0 static Tcl_CallFrame * BeginOfCallChain(const Tcl_Interp *interp, NsfObject *object) nonnull(1); static Tcl_CallFrame * BeginOfCallChain(const Tcl_Interp *interp, NsfObject *object) { Tcl_CallFrame *varFramePtr = (Tcl_CallFrame *)Tcl_Interp_varFramePtr(interp), *prevFramePtr = varFramePtr; nonnull_assert(interp != NULL); if (object != NULL) { fprintf(stderr, "BeginOfCallChain obj %s\n", ObjectName(object)); for (; varFramePtr != NULL; varFramePtr = Tcl_CallFrame_callerPtr(varFramePtr)) { register unsigned int flags = Tcl_CallFrame_isProcCallFrame(varFramePtr); if (flags & (FRAME_IS_NSF_METHOD|FRAME_IS_NSF_CMETHOD)) { const NsfCallStackContent *cscPtr = (NsfCallStackContent *)Tcl_CallFrame_clientData(varFramePtr); if (cscPtr->self == object) { prevFramePtr = varFramePtr; continue; } } else if ((flags & (FRAME_IS_NSF_OBJECT|FRAME_IS_LAMBDA)) != 0u) { continue; } break; } } fprintf(stderr, "BeginOfCallChain returns %p\n", prevFramePtr); return prevFramePtr; } #endif /* * Local Variables: * mode: c * c-basic-offset: 2 * fill-column: 78 * indent-tabs-mode: nil * End: */