diff options
Diffstat (limited to 'generic/tclBasic.c')
| -rw-r--r-- | generic/tclBasic.c | 162 |
1 files changed, 148 insertions, 14 deletions
diff --git a/generic/tclBasic.c b/generic/tclBasic.c index b83afe5..d97194c 100644 --- a/generic/tclBasic.c +++ b/generic/tclBasic.c @@ -16,7 +16,7 @@ * See the file "license.terms" for information on usage and redistribution of * this file, and for a DISCLAIMER OF ALL WARRANTIES. * - * RCS: @(#) $Id: tclBasic.c,v 1.401 2009/08/12 16:06:41 dgp Exp $ + * RCS: @(#) $Id: tclBasic.c,v 1.402 2009/08/25 21:03:25 andreas_kupries Exp $ */ #include "tclInt.h" @@ -522,6 +522,7 @@ Tcl_CreateInterp(void) Tcl_InitHashTable(iPtr->lineBCPtr, TCL_ONE_WORD_KEYS); Tcl_InitHashTable(iPtr->lineLAPtr, TCL_ONE_WORD_KEYS); Tcl_InitHashTable(iPtr->lineLABCPtr, TCL_ONE_WORD_KEYS); + iPtr->scriptCLLocPtr = NULL; iPtr->activeVarTracePtr = NULL; @@ -4767,7 +4768,8 @@ Tcl_EvalTokensStandard( int count) /* Number of tokens to consider at tokenPtr. * Must be at least 1. */ { - return TclSubstTokens(interp, tokenPtr, count, /* numLeftPtr */ NULL, 1); + return TclSubstTokens(interp, tokenPtr, count, /* numLeftPtr */ NULL, 1, + NULL, NULL); } /* @@ -4851,7 +4853,7 @@ Tcl_EvalEx( * evaluation of the script. Only * TCL_EVAL_GLOBAL is currently supported. */ { - return TclEvalEx(interp, script, numBytes, flags, 1); + return TclEvalEx(interp, script, numBytes, flags, 1, NULL, script); } int @@ -4865,7 +4867,24 @@ TclEvalEx( int flags, /* Collection of OR-ed bits that control the * evaluation of the script. Only * TCL_EVAL_GLOBAL is currently supported. */ - int line) /* The line the script starts on. */ + int line, /* The line the script starts on. */ + int* clNextOuter, /* Information about an outer context for */ + CONST char* outerScript) /* continuation line data. This is set only in + * EvalTokensStandard(), to properly handle + * [...]-nested commands. The 'outerScript' + * refers to the most-outer script containing the + * embedded command, which is refered to by + * 'script'. The 'clNextOuter' refers to the + * current entry in the table of continuation + * lines in this "master script", and the + * character offsets are relative to the + * 'outerScript' as well. + * + * If outerScript == script, then this call is + * for the outer-most script/command. See + * Tcl_EvalEx() and TclEvalObjEx() for places + * generating arguments for which this is true. + */ { Interp *iPtr = (Interp *) interp; const char *p, *next; @@ -4891,6 +4910,23 @@ TclEvalEx( int *linesStack = TclStackAlloc(interp, minObjs * sizeof(int)); /* TIP #280 Structures for tracking of command * locations. */ + /* + * Pointer for the tracking of invisible continuation lines. Initialized + * only if the caller gave us a table of locations to track, via + * scriptCLLocPtr. It always refers to the table entry holding the + * location of the next invisible continuation line to look for, while + * parsing the script. + */ + + int* clNext = NULL; + + if (iPtr->scriptCLLocPtr) { + if (clNextOuter) { + clNext = clNextOuter; + } else { + clNext = &iPtr->scriptCLLocPtr->loc[0]; + } + } if (numBytes < 0) { numBytes = strlen(script); @@ -4916,12 +4952,12 @@ TclEvalEx( /* * TIP #280 Initialize tracking. Do not push on the frame stack yet. * - * We may cont. counting based on a specific context (CTX), or open a new - * context, either for a sourced script, or 'eval'. For sourced files we - * always have a path object, even if nothing was specified in the interp - * itself. That makes code using it simpler as NULL checks can be left - * out. Sourced file without path in the 'scriptFile' is possible during - * Tcl initialization. + * We may continue counting based on a specific context (CTX), or open a + * new context, either for a sourced script, or 'eval'. For sourced files + * we always have a path object, even if nothing was specified in the + * interp itself. That makes code using it simpler as NULL checks can be + * left out. Sourced file without path in the 'scriptFile' is possible + * during Tcl initialization. */ eeFramePtr->level = iPtr->cmdFramePtr ? iPtr->cmdFramePtr->level + 1 : 1; @@ -4989,19 +5025,25 @@ TclEvalEx( /* * TIP #280 Track lines. The parser may have skipped text till it * found the command we are now at. We have to count the lines in this - * block. + * block, and do not forget invisible continuation lines. */ TclAdvanceLines(&line, p, parsePtr->commandStart); + TclAdvanceContinuations (&line, &clNext, + parsePtr->commandStart - outerScript); gotParse = 1; if (parsePtr->numWords > 0) { /* - * TIP #280. Track lines within the words of the current command. + * TIP #280. Track lines within the words of the current + * command. We use a separate pointer into the table of + * continuation line locations to not lose our position for the + * per-command parsing. */ int wordLine = line; const char *wordStart = parsePtr->commandStart; + int* wordCLNext = clNext; /* * Generate an array of objects for the words of the command. @@ -5033,6 +5075,8 @@ TclEvalEx( */ TclAdvanceLines(&wordLine, wordStart, tokenPtr->start); + TclAdvanceContinuations (&wordLine, &wordCLNext, + tokenPtr->start - outerScript); wordStart = tokenPtr->start; lines[objectsUsed] = TclWordKnownAtCompileTime(tokenPtr, NULL) @@ -5043,7 +5087,8 @@ TclEvalEx( } code = TclSubstTokens(interp, tokenPtr+1, - tokenPtr->numComponents, NULL, wordLine); + tokenPtr->numComponents, NULL, wordLine, + wordCLNext, outerScript); iPtr->evalFlags = 0; @@ -5075,6 +5120,11 @@ TclEvalEx( expand[objectsUsed] = 0; objectsNeeded++; } + + if (wordCLNext) { + TclContinuationsEnterDerived (objv[objectsUsed], + wordStart - outerScript, wordCLNext); + } } /* for loop */ iPtr->cmdFramePtr = eeFramePtr; if (code != TCL_OK) { @@ -5302,6 +5352,53 @@ TclAdvanceLines( /* *---------------------------------------------------------------------- + * + * TclAdvanceContinuations -- + * + * This procedure is a helper which counts the number of continuation + * lines (CL) in a block of text using a table of CL locations and + * advances an external counter, and the pointer into the table. + * + * Results: + * None. + * + * Side effects: + * The specified counter is advanced per the number of continuation lines + * found. + * + * TIP #280 + *---------------------------------------------------------------------- + */ + +void +TclAdvanceContinuations (line,clNextPtrPtr,loc) + int* line; + int** clNextPtrPtr; + int loc; +{ + /* + * Track the invisible continuation lines embedded in a script, if + * any. Here they are just spaces (already). They were removed by + * EvalTokensStandard() via Tcl_UtfBackslash(). + * + * *clNextPtrPtr <=> We have continuation lines to track. + * **clNextPtrPtr >= 0 <=> We are not beyond the last possible location. + * loc >= **clNextPtrPtr <=> We stepped beyond the current cont. line. + */ + + while (*clNextPtrPtr && (**clNextPtrPtr >= 0) && (loc >= **clNextPtrPtr)) { + /* + * We just stepped over an invisible continuation line. Adjust the + * line counter and step to the table entry holding the location of + * the next continuation line to track. + */ + (*line) ++; + (*clNextPtrPtr) ++; + } +} + +/* + *---------------------------------------------------------------------- * Note: The whole data structure access for argument location tracking is * hidden behind these three functions. The only parts open are the lineLAPtr * field in the Interp structure. The CFWord definition is internal to here. @@ -5919,6 +6016,33 @@ TclNREvalObjEx( const char *script; int numSrcBytes; + /* + * Now we check if we have data about invisible continuation lines for + * the script, and make it available to the direct script parser and + * evaluator we are about to call, if so. + * + * It may be possible that the script Tcl_Obj* can be free'd while the + * evaluator is using it, leading to the release of the associated + * ContLineLoc structure as well. To ensure that the latter doesn't + * happen we set a lock on it. We release this lock later in this + * function, after the evaluator is done. The relevant "lineCLPtr" + * hashtable is managed in the file "tclObj.c". + * + * Another important action is to save (and later restore) the + * continuation line information of the caller, in case we are + * executing nested commands in the eval/direct path. + */ + + ContLineLoc* saveCLLocPtr = iPtr->scriptCLLocPtr; + ContLineLoc* clLocPtr = TclContinuationsGet (objPtr); + + if (clLocPtr) { + iPtr->scriptCLLocPtr = clLocPtr; + Tcl_Preserve (iPtr->scriptCLLocPtr); + } else { + iPtr->scriptCLLocPtr = NULL; + } + Tcl_IncrRefCount(objPtr); if (invoker == NULL) { /* @@ -5974,7 +6098,7 @@ TclNREvalObjEx( iPtr->evalFlags |= TCL_EVAL_CTX; result = TclEvalEx(interp, script, numSrcBytes, flags, - ctxPtr->line[word]); + ctxPtr->line[word], NULL, script); if (pc) { /* @@ -5985,6 +6109,16 @@ TclNREvalObjEx( } } TclStackFree(interp, ctxPtr); + + /* + * Now release the lock on the continuation line information, if + * any, and restore the caller's settings. + */ + + if (iPtr->scriptCLLocPtr) { + Tcl_Release (iPtr->scriptCLLocPtr); + } + iPtr->scriptCLLocPtr = saveCLLocPtr; } TclDecrRefCount(objPtr); return result; |