diff options
Diffstat (limited to 'generic')
| -rw-r--r-- | generic/tclBasic.c | 16 | ||||
| -rw-r--r-- | generic/tclInt.h | 22 | ||||
| -rw-r--r-- | generic/tclRegexp.c | 290 | ||||
| -rw-r--r-- | generic/tclRegexp.h | 4 |
4 files changed, 212 insertions, 120 deletions
diff --git a/generic/tclBasic.c b/generic/tclBasic.c index e673a3c..10d8311 100644 --- a/generic/tclBasic.c +++ b/generic/tclBasic.c @@ -12,7 +12,7 @@ * 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 1.19 1999/04/16 00:46:42 stanton Exp $ + * RCS: @(#) $Id: tclBasic.c,v 1.20 1999/05/13 01:50:32 stanton Exp $ */ #include "tclInt.h" @@ -323,11 +323,6 @@ Tcl_CreateInterp() iPtr->appendAvl = 0; iPtr->appendUsed = 0; - for (i = 0; i < NUM_REGEXPS; i++) { - iPtr->patterns[i] = NULL; - iPtr->patLengths[i] = -1; - iPtr->regexps[i] = NULL; - } Tcl_InitHashTable(&iPtr->packageTable, TCL_STRING_KEYS); iPtr->packageUnknown = NULL; iPtr->cmdCount = 0; @@ -923,7 +918,6 @@ DeleteInterpProc(interp) Tcl_HashSearch search; Tcl_HashTable *hTablePtr; ResolverScheme *resPtr, *nextResPtr; - int i; /* * Punt if there is an error in the Tcl_Release/Tcl_Preserve matchup. @@ -1039,14 +1033,6 @@ DeleteInterpProc(interp) ckfree(iPtr->appendResult); iPtr->appendResult = NULL; } - for (i = 0; i < NUM_REGEXPS; i++) { - if (iPtr->patterns[i] == NULL) { - break; - } - ckfree(iPtr->patterns[i]); - ckfree((char *) iPtr->regexps[i]); - iPtr->regexps[i] = NULL; - } TclFreePackageInfo(iPtr); while (iPtr->tracePtr != NULL) { Trace *nextPtr = iPtr->tracePtr->nextPtr; diff --git a/generic/tclInt.h b/generic/tclInt.h index 39032cf..68614bc 100644 --- a/generic/tclInt.h +++ b/generic/tclInt.h @@ -11,7 +11,7 @@ * See the file "license.terms" for information on usage and redistribution * of this file, and for a DISCLAIMER OF ALL WARRANTIES. * - * RCS: @(#) $Id: tclInt.h,v 1.28 1999/04/22 22:57:07 stanton Exp $ + * RCS: @(#) $Id: tclInt.h,v 1.29 1999/05/13 01:50:32 stanton Exp $ */ #ifndef _TCLINT @@ -1183,26 +1183,6 @@ typedef struct Interp { * stored at partialResult. */ /* - * A cache of compiled regular expressions. See Tcl_RegExpCompile - * in tclUtil.c for details. THIS CACHE IS OBSOLETE and is only - * retained for backward compatibility with Tcl_RegExpCompile. - * New code should use the object interface so the Tcl_Obj caches - * the compiled expression. - */ - -#define NUM_REGEXPS 5 - char *patterns[NUM_REGEXPS];/* Strings corresponding to compiled - * regular expression patterns. NULL - * means that this slot isn't used. - * Malloc-ed. */ - int patLengths[NUM_REGEXPS];/* Number of non-null characters in - * corresponding entry in patterns. - * -1 means entry isn't used. */ - struct TclRegexp *regexps[NUM_REGEXPS]; - /* Compiled forms of above strings. Also - * malloc-ed, or NULL if not in use yet. */ - - /* * Information about packages. Used only in tclPkg.c. */ diff --git a/generic/tclRegexp.c b/generic/tclRegexp.c index 96d2aea..b435968 100644 --- a/generic/tclRegexp.c +++ b/generic/tclRegexp.c @@ -10,7 +10,7 @@ * See the file "license.terms" for information on usage and redistribution * of this file, and for a DISCLAIMER OF ALL WARRANTIES. * - * RCS: @(#) $Id: tclRegexp.c,v 1.2 1999/04/16 00:46:52 stanton Exp $ + * RCS: @(#) $Id: tclRegexp.c,v 1.3 1999/05/13 01:50:32 stanton Exp $ */ #include "tclInt.h" @@ -61,16 +61,41 @@ */ /* + * Thread local storage used to maintain a per-thread cache of compiled + * regular expressions. + */ + +#define NUM_REGEXPS 5 + +typedef struct ThreadSpecificData { + int initialized; /* Set to 1 when the module is initialized. */ + char *patterns[NUM_REGEXPS];/* Strings corresponding to compiled + * regular expression patterns. NULL + * means that this slot isn't used. + * Malloc-ed. */ + int patLengths[NUM_REGEXPS];/* Number of non-null characters in + * corresponding entry in patterns. + * -1 means entry isn't used. */ + struct TclRegexp *regexps[NUM_REGEXPS]; + /* Compiled forms of above strings. Also + * malloc-ed, or NULL if not in use yet. */ +} ThreadSpecificData; + +static Tcl_ThreadDataKey dataKey; + +/* * Declarations for functions used only in this file. */ +static TclRegexp * CompileRegexp _ANSI_ARGS_((Tcl_Interp *interp, + char *pattern, int length, int flags)); static void DupRegexpInternalRep _ANSI_ARGS_((Tcl_Obj *srcPtr, Tcl_Obj *copyPtr)); -static void FreeRegexpInternalRep _ANSI_ARGS_((Tcl_Obj *regexpPtr)); +static void FinalizeRegexp _ANSI_ARGS_((ClientData clientData)); +static void FreeRegexp _ANSI_ARGS_((TclRegexp *regexpPtr)); +static void FreeRegexpInternalRep _ANSI_ARGS_((Tcl_Obj *objPtr)); static int SetRegexpFromAny _ANSI_ARGS_((Tcl_Interp *interp, Tcl_Obj *objPtr)); -static TclRegexp * CompileRegexp _ANSI_ARGS_((Tcl_Interp *interp, - char *pattern, int length, int flags)); /* * The regular expression Tcl object type. This serves as a cache @@ -111,71 +136,13 @@ Tcl_ObjType tclRegexpType = { Tcl_RegExp Tcl_RegExpCompile(interp, string) - Tcl_Interp *interp; /* For use in error reporting. */ - char *string; /* String for which to produce - * compiled regular expression. */ + Tcl_Interp *interp; /* For use in error reporting and + * to access the interp regexp cache. */ + char *string; /* String for which to produce + * compiled regular expression. */ { - Interp *iPtr = (Interp *) interp; - int i, length; - TclRegexp *result; - - length = strlen(string); - for (i = 0; i < NUM_REGEXPS; i++) { - if ((length == iPtr->patLengths[i]) - && (strcmp(string, iPtr->patterns[i]) == 0)) { - /* - * Move the matched pattern to the first slot in the - * cache and shift the other patterns down one position. - */ - - if (i != 0) { - int j; - char *cachedString; - - cachedString = iPtr->patterns[i]; - result = iPtr->regexps[i]; - for (j = i-1; j >= 0; j--) { - iPtr->patterns[j+1] = iPtr->patterns[j]; - iPtr->patLengths[j+1] = iPtr->patLengths[j]; - iPtr->regexps[j+1] = iPtr->regexps[j]; - } - iPtr->patterns[0] = cachedString; - iPtr->patLengths[0] = length; - iPtr->regexps[0] = result; - } - return (Tcl_RegExp) iPtr->regexps[0]; - } - } - - /* - * No match in the cache. Compile the string and add it to the - * cache. - */ - - result = CompileRegexp(interp, string, length, REG_ADVANCED); - if (!result) { - return NULL; - } - - /* - * We successfully compiled the expression, so add it to the cache. - */ - - if (iPtr->patterns[NUM_REGEXPS-1] != NULL) { - ckfree(iPtr->patterns[NUM_REGEXPS-1]); - TclReFree(&(iPtr->regexps[NUM_REGEXPS-1]->re)); - ckfree((char *) iPtr->regexps[NUM_REGEXPS-1]); - } - for (i = NUM_REGEXPS - 2; i >= 0; i--) { - iPtr->patterns[i+1] = iPtr->patterns[i]; - iPtr->patLengths[i+1] = iPtr->patLengths[i]; - iPtr->regexps[i+1] = iPtr->regexps[i]; - } - iPtr->patterns[0] = (char *) ckalloc((unsigned) (length+1)); - strcpy(iPtr->patterns[0], string); - iPtr->patLengths[0] = length; - iPtr->regexps[0] = result; - return (Tcl_RegExp) result; + return (Tcl_RegExp) CompileRegexp(interp, string, strlen(string), + REG_ADVANCED); } /* @@ -479,7 +446,8 @@ TclRegExpMatchObj(interp, string, patObj) Tcl_RegExp Tcl_GetRegExpFromObj(interp, objPtr, flags) - Tcl_Interp *interp; /* For use in error reporting. */ + Tcl_Interp *interp; /* For use in error reporting, and to access + * the interp regexp cache. */ Tcl_Obj *objPtr; /* Object whose string rep contains regular * expression pattern. Internal rep will be * changed to compiled form of this regular @@ -496,12 +464,21 @@ Tcl_GetRegExpFromObj(interp, objPtr, flags) if ((typePtr != &tclRegexpType) || (regexpPtr->flags != flags)) { pattern = Tcl_GetStringFromObj(objPtr, &length); + regexpPtr = CompileRegexp(interp, pattern, length, flags); if (regexpPtr == NULL) { return NULL; } /* + * Add a reference to the regexp so it will persist even if it is + * pushed out of the current thread's regexp cache. This reference + * will be removed when the object's internal rep is freed. + */ + + regexpPtr->refCount++; + + /* * Free the old representation and set our type. */ @@ -653,11 +630,13 @@ FreeRegexpInternalRep(objPtr) { TclRegexp *regexpRepPtr = (TclRegexp *) objPtr->internalRep.otherValuePtr; - TclReFree(®expRepPtr->re); - if (regexpRepPtr->matches) { - ckfree((char *) regexpRepPtr->matches); + /* + * If this is the last reference to the regexp, free it. + */ + + if (--(regexpRepPtr->refCount) <= 0) { + FreeRegexp(regexpRepPtr); } - ckfree((char *) regexpRepPtr); } /* @@ -665,14 +644,14 @@ FreeRegexpInternalRep(objPtr) * * DupRegexpInternalRep -- * - * It is way too hairy to copy a regular expression, so we punt - * and revert the object back to a vanilla string. + * We copy the reference to the compiled regexp and bump its + * reference count. * * Results: * None. * * Side effects: - * Changes the type back to string. + * Increments the reference count of the regexp. * *---------------------------------------------------------------------- */ @@ -682,8 +661,10 @@ DupRegexpInternalRep(srcPtr, copyPtr) Tcl_Obj *srcPtr; /* Object with internal rep to copy. */ Tcl_Obj *copyPtr; /* Object with internal rep to set. */ { - copyPtr->internalRep.longValue = (long)copyPtr->length; - copyPtr->typePtr = &tclStringType; + TclRegexp *regexpPtr = (TclRegexp *) srcPtr->internalRep.otherValuePtr; + regexpPtr->refCount++; + copyPtr->internalRep.otherValuePtr = srcPtr->internalRep.otherValuePtr; + copyPtr->typePtr = &tclRegexpType; } /* @@ -700,8 +681,8 @@ DupRegexpInternalRep(srcPtr, copyPtr) * unless "interp" is NULL. * * Side effects: - * If no error occurs, a regular expression is stored as "objPtr"s internal - * representation. + * If no error occurs, a regular expression is stored as "objPtr"s + * internal representation. * *---------------------------------------------------------------------- */ @@ -722,7 +703,9 @@ SetRegexpFromAny(interp, objPtr) * * CompileRegexp -- * - * Attempt to compile the given regexp pattern + * Attempt to compile the given regexp pattern. If the compiled + * regular expression can be found in the per-thread cache, it + * will be used instead of compiling a new copy. * * Results: * The return value is a pointer to a newly allocated TclRegexp @@ -731,7 +714,8 @@ SetRegexpFromAny(interp, objPtr) * left in the interp's result. * * Side effects: - * Memory allocated. + * The thread-local regexp cache is updated and a new TclRegexp may + * be allocated. * *---------------------------------------------------------------------- */ @@ -747,8 +731,58 @@ CompileRegexp(interp, string, length, flags) Tcl_UniChar *uniString; int numChars; Tcl_DString stringBuf; - int status; + int status, i; + ThreadSpecificData *tsdPtr = TCL_TSD_INIT(&dataKey); + + if (!tsdPtr->initialized) { + tsdPtr->initialized = 1; + Tcl_CreateThreadExitHandler(FinalizeRegexp, NULL); + } + + /* + * This routine maintains a second-level regular expression cache in + * addition to the per-object regexp cache. The per-thread cache is needed + * to handle the case where for various reasons the object is lost between + * invocations of the regexp command, but the literal pattern is the same. + */ + + /* + * Check the per-thread compiled regexp cache. We can only reuse + * a regexp if it has the same pattern and the same flags. + */ + + for (i = 0; i < NUM_REGEXPS; i++) { + if ((length == tsdPtr->patLengths[i]) + && (tsdPtr->regexps[i]->flags == flags) + && (strcmp(string, tsdPtr->patterns[i]) == 0)) { + /* + * Move the matched pattern to the first slot in the + * cache and shift the other patterns down one position. + */ + + if (i != 0) { + int j; + char *cachedString; + + cachedString = tsdPtr->patterns[i]; + regexpPtr = tsdPtr->regexps[i]; + for (j = i-1; j >= 0; j--) { + tsdPtr->patterns[j+1] = tsdPtr->patterns[j]; + tsdPtr->patLengths[j+1] = tsdPtr->patLengths[j]; + tsdPtr->regexps[j+1] = tsdPtr->regexps[j]; + } + tsdPtr->patterns[0] = cachedString; + tsdPtr->patLengths[0] = length; + tsdPtr->regexps[0] = regexpPtr; + } + return tsdPtr->regexps[0]; + } + } + /* + * This is a new expression, so compile it and add it to the cache. + */ + regexpPtr = (TclRegexp *) ckalloc(sizeof(TclRegexp)); /* @@ -771,6 +805,7 @@ CompileRegexp(interp, string, length, flags) /* * Clean up and report errors in the interpreter, if possible. */ + ckfree((char *)regexpPtr); if (interp) { TclRegError(interp, @@ -788,5 +823,94 @@ CompileRegexp(interp, string, length, flags) regexpPtr->matches = (regmatch_t *) ckalloc( sizeof(regmatch_t) * (regexpPtr->re.re_nsub + 1)); + /* + * Initialize the refcount to one initially, since it is in the cache. + */ + + regexpPtr->refCount = 1; + + /* + * Free the last regexp, if necessary, and make room at the head of the + * list for the new regexp. + */ + + if (tsdPtr->patterns[NUM_REGEXPS-1] != NULL) { + TclRegexp *oldRegexpPtr = tsdPtr->regexps[NUM_REGEXPS-1]; + if (--(oldRegexpPtr->refCount) <= 0) { + FreeRegexp(oldRegexpPtr); + } + ckfree(tsdPtr->patterns[NUM_REGEXPS-1]); + } + for (i = NUM_REGEXPS - 2; i >= 0; i--) { + tsdPtr->patterns[i+1] = tsdPtr->patterns[i]; + tsdPtr->patLengths[i+1] = tsdPtr->patLengths[i]; + tsdPtr->regexps[i+1] = tsdPtr->regexps[i]; + } + tsdPtr->patterns[0] = (char *) ckalloc((unsigned) (length+1)); + strcpy(tsdPtr->patterns[0], string); + tsdPtr->patLengths[0] = length; + tsdPtr->regexps[0] = regexpPtr; + return regexpPtr; } + +/* + *---------------------------------------------------------------------- + * + * FreeRegexp -- + * + * Release the storage associated with a TclRegexp. + * + * Results: + * None. + * + * Side effects: + * None. + * + *---------------------------------------------------------------------- + */ + +static void +FreeRegexp(regexpPtr) + TclRegexp *regexpPtr; /* Compiled regular expression to free. */ +{ + TclReFree(®expPtr->re); + if (regexpPtr->matches) { + ckfree((char *) regexpPtr->matches); + } + ckfree((char *) regexpPtr); +} + +/* + *---------------------------------------------------------------------- + * + * FinalizeRegexp -- + * + * Release the storage associated with the per-thread regexp + * cache. + * + * Results: + * None. + * + * Side effects: + * None. + * + *---------------------------------------------------------------------- + */ + +static void +FinalizeRegexp(clientData) + ClientData clientData; /* Not used. */ +{ + int i; + TclRegexp *regexpPtr; + ThreadSpecificData *tsdPtr = TCL_TSD_INIT(&dataKey); + + for (i = 0; (i < NUM_REGEXPS) && (tsdPtr->patterns[i] != NULL); i++) { + regexpPtr = tsdPtr->regexps[i]; + if (--(regexpPtr->refCount) <= 0) { + FreeRegexp(regexpPtr); + } + ckfree(tsdPtr->patterns[i]); + } +} diff --git a/generic/tclRegexp.h b/generic/tclRegexp.h index 7be13c1..948a72d 100644 --- a/generic/tclRegexp.h +++ b/generic/tclRegexp.h @@ -33,7 +33,7 @@ * See the file "license.terms" for information on usage and redistribution * of this file, and for a DISCLAIMER OF ALL WARRANTIES. * - * RCS: @(#) $Id: tclRegexp.h,v 1.5 1999/04/16 00:46:52 stanton Exp $ + * RCS: @(#) $Id: tclRegexp.h,v 1.6 1999/05/13 01:50:33 stanton Exp $ */ #ifndef _TCLREGEXP @@ -64,6 +64,8 @@ typedef struct TclRegexp { * representation of the last string matched * with this regexp to indicate the location * of subexpressions. */ + int refCount; /* Count of number of references to this + * compiled regexp. } TclRegexp; /* |