637 lines
18 KiB
C
637 lines
18 KiB
C
/*
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* tclLoad.c --
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*
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* This file provides the generic portion (those that are the same
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* on all platforms) of Tcl's dynamic loading facilities.
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*
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* Copyright (c) 1995 Sun Microsystems, Inc.
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*
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* See the file "license.terms" for information on usage and redistribution
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* of this file, and for a DISCLAIMER OF ALL WARRANTIES.
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*
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* SCCS: @(#) tclLoad.c 1.17 97/07/24 20:05:04
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*/
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#include "tclInt.h"
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/*
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* The following structure describes a package that has been loaded
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* either dynamically (with the "load" command) or statically (as
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* indicated by a call to Tcl_PackageLoaded). All such packages
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* are linked together into a single list for the process. Packages
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* are never unloaded, so these structures are never freed.
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*/
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typedef struct LoadedPackage {
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char *fileName; /* Name of the file from which the
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* package was loaded. An empty string
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* means the package is loaded statically.
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* Malloc-ed. */
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char *packageName; /* Name of package prefix for the package,
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* properly capitalized (first letter UC,
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* others LC), no "_", as in "Net".
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* Malloc-ed. */
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Tcl_PackageInitProc *initProc;
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/* Initialization procedure to call to
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* incorporate this package into a trusted
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* interpreter. */
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Tcl_PackageInitProc *safeInitProc;
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/* Initialization procedure to call to
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* incorporate this package into a safe
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* interpreter (one that will execute
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* untrusted scripts). NULL means the
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* package can't be used in unsafe
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* interpreters. */
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struct LoadedPackage *nextPtr;
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/* Next in list of all packages loaded into
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* this application process. NULL means
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* end of list. */
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} LoadedPackage;
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static LoadedPackage *firstPackagePtr = NULL;
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/* First in list of all packages loaded into
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* this process. */
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/*
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* The following structure represents a particular package that has
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* been incorporated into a particular interpreter (by calling its
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* initialization procedure). There is a list of these structures for
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* each interpreter, with an AssocData value (key "load") for the
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* interpreter that points to the first package (if any).
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*/
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typedef struct InterpPackage {
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LoadedPackage *pkgPtr; /* Points to detailed information about
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* package. */
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struct InterpPackage *nextPtr;
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/* Next package in this interpreter, or
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* NULL for end of list. */
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} InterpPackage;
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/*
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* Prototypes for procedures that are private to this file:
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*/
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static void LoadCleanupProc _ANSI_ARGS_((ClientData clientData,
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Tcl_Interp *interp));
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static void LoadExitProc _ANSI_ARGS_((ClientData clientData));
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/*
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*----------------------------------------------------------------------
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*
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* Tcl_LoadCmd --
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*
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* This procedure is invoked to process the "load" Tcl command.
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* See the user documentation for details on what it does.
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*
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* Results:
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* A standard Tcl result.
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*
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* Side effects:
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* See the user documentation.
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*
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*----------------------------------------------------------------------
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*/
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int
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Tcl_LoadCmd(dummy, interp, argc, argv)
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ClientData dummy; /* Not used. */
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Tcl_Interp *interp; /* Current interpreter. */
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int argc; /* Number of arguments. */
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char **argv; /* Argument strings. */
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{
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Tcl_Interp *target;
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LoadedPackage *pkgPtr, *defaultPtr;
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Tcl_DString pkgName, initName, safeInitName, fileName;
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Tcl_PackageInitProc *initProc, *safeInitProc;
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InterpPackage *ipFirstPtr, *ipPtr;
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int code, c, gotPkgName, namesMatch, filesMatch;
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char *p, *fullFileName, *p1, *p2;
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if ((argc < 2) || (argc > 4)) {
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Tcl_AppendResult(interp, "wrong # args: should be \"", argv[0],
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" fileName ?packageName? ?interp?\"", (char *) NULL);
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return TCL_ERROR;
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}
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fullFileName = Tcl_TranslateFileName(interp, argv[1], &fileName);
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if (fullFileName == NULL) {
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return TCL_ERROR;
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}
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Tcl_DStringInit(&pkgName);
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Tcl_DStringInit(&initName);
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Tcl_DStringInit(&safeInitName);
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if ((argc >= 3) && (argv[2][0] != 0)) {
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gotPkgName = 1;
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} else {
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gotPkgName = 0;
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}
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if ((fullFileName[0] == 0) && !gotPkgName) {
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Tcl_SetResult(interp,
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"must specify either file name or package name",
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TCL_STATIC);
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code = TCL_ERROR;
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goto done;
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}
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/*
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* Figure out which interpreter we're going to load the package into.
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*/
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target = interp;
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if (argc == 4) {
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target = Tcl_GetSlave(interp, argv[3]);
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if (target == NULL) {
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Tcl_AppendResult(interp, "couldn't find slave interpreter named \"",
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argv[3], "\"", (char *) NULL);
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return TCL_ERROR;
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}
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}
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/*
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* Scan through the packages that are currently loaded to see if the
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* package we want is already loaded. We'll use a loaded package if
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* it meets any of the following conditions:
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* - Its name and file match the once we're looking for.
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* - Its file matches, and we weren't given a name.
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* - Its name matches, the file name was specified as empty, and there
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* is only no statically loaded package with the same name.
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*/
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defaultPtr = NULL;
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for (pkgPtr = firstPackagePtr; pkgPtr != NULL; pkgPtr = pkgPtr->nextPtr) {
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if (!gotPkgName) {
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namesMatch = 0;
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} else {
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namesMatch = 1;
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for (p1 = argv[2], p2 = pkgPtr->packageName; ; p1++, p2++) {
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if ((isupper(UCHAR(*p1)) ? tolower(UCHAR(*p1)) : *p1)
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!= (isupper(UCHAR(*p2)) ? tolower(UCHAR(*p2)) : *p2)) {
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namesMatch = 0;
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break;
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}
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if (*p1 == 0) {
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break;
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}
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}
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}
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filesMatch = (strcmp(pkgPtr->fileName, fullFileName) == 0);
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if (filesMatch && (namesMatch || !gotPkgName)) {
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break;
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}
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if (namesMatch && (fullFileName[0] == 0)) {
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defaultPtr = pkgPtr;
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}
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if (filesMatch && !namesMatch && (fullFileName[0] != 0)) {
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/*
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* Can't have two different packages loaded from the same
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* file.
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*/
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Tcl_AppendResult(interp, "file \"", fullFileName,
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"\" is already loaded for package \"",
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pkgPtr->packageName, "\"", (char *) NULL);
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code = TCL_ERROR;
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goto done;
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}
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}
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if (pkgPtr == NULL) {
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pkgPtr = defaultPtr;
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}
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/*
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* Scan through the list of packages already loaded in the target
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* interpreter. If the package we want is already loaded there,
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* then there's nothing for us to to.
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*/
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if (pkgPtr != NULL) {
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ipFirstPtr = (InterpPackage *) Tcl_GetAssocData(target, "tclLoad",
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(Tcl_InterpDeleteProc **) NULL);
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for (ipPtr = ipFirstPtr; ipPtr != NULL; ipPtr = ipPtr->nextPtr) {
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if (ipPtr->pkgPtr == pkgPtr) {
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code = TCL_OK;
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goto done;
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}
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}
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}
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if (pkgPtr == NULL) {
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/*
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* The desired file isn't currently loaded, so load it. It's an
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* error if the desired package is a static one.
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*/
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if (fullFileName[0] == 0) {
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Tcl_AppendResult(interp, "package \"", argv[2],
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"\" isn't loaded statically", (char *) NULL);
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code = TCL_ERROR;
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goto done;
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}
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/*
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* Figure out the module name if it wasn't provided explicitly.
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*/
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if (gotPkgName) {
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Tcl_DStringAppend(&pkgName, argv[2], -1);
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} else {
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if (!TclGuessPackageName(fullFileName, &pkgName)) {
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int pargc;
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char **pargv, *pkgGuess;
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/*
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* The platform-specific code couldn't figure out the
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* module name. Make a guess by taking the last element
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* of the file name, stripping off any leading "lib",
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* and then using all of the alphabetic and underline
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* characters that follow that.
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*/
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Tcl_SplitPath(fullFileName, &pargc, &pargv);
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pkgGuess = pargv[pargc-1];
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if ((pkgGuess[0] == 'l') && (pkgGuess[1] == 'i')
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&& (pkgGuess[2] == 'b')) {
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pkgGuess += 3;
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}
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for (p = pkgGuess; isalpha(UCHAR(*p)) || (*p == '_'); p++) {
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/* Empty loop body. */
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}
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if (p == pkgGuess) {
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ckfree((char *)pargv);
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Tcl_AppendResult(interp,
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"couldn't figure out package name for ",
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fullFileName, (char *) NULL);
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code = TCL_ERROR;
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goto done;
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}
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Tcl_DStringAppend(&pkgName, pkgGuess, (p - pkgGuess));
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ckfree((char *)pargv);
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}
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}
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/*
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* Fix the capitalization in the package name so that the first
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* character is in caps but the others are all lower-case.
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*/
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p = Tcl_DStringValue(&pkgName);
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c = UCHAR(*p);
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if (c != 0) {
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if (islower(c)) {
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*p = (char) toupper(c);
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}
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p++;
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while (1) {
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c = UCHAR(*p);
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if (c == 0) {
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break;
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}
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if (isupper(c)) {
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*p = (char) tolower(c);
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}
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p++;
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}
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}
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/*
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* Compute the names of the two initialization procedures,
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* based on the package name.
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*/
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Tcl_DStringAppend(&initName, Tcl_DStringValue(&pkgName), -1);
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Tcl_DStringAppend(&initName, "_Init", 5);
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Tcl_DStringAppend(&safeInitName, Tcl_DStringValue(&pkgName), -1);
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Tcl_DStringAppend(&safeInitName, "_SafeInit", 9);
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/*
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* Call platform-specific code to load the package and find the
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* two initialization procedures.
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*/
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code = TclLoadFile(interp, fullFileName, Tcl_DStringValue(&initName),
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Tcl_DStringValue(&safeInitName), &initProc, &safeInitProc);
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if (code != TCL_OK) {
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goto done;
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}
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if (initProc == NULL) {
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Tcl_AppendResult(interp, "couldn't find procedure ",
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Tcl_DStringValue(&initName), (char *) NULL);
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code = TCL_ERROR;
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goto done;
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}
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/*
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* Create a new record to describe this package.
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*/
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if (firstPackagePtr == NULL) {
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Tcl_CreateExitHandler(LoadExitProc, (ClientData) NULL);
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}
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pkgPtr = (LoadedPackage *) ckalloc(sizeof(LoadedPackage));
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pkgPtr->fileName = (char *) ckalloc((unsigned)
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(strlen(fullFileName) + 1));
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strcpy(pkgPtr->fileName, fullFileName);
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pkgPtr->packageName = (char *) ckalloc((unsigned)
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(Tcl_DStringLength(&pkgName) + 1));
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strcpy(pkgPtr->packageName, Tcl_DStringValue(&pkgName));
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pkgPtr->initProc = initProc;
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pkgPtr->safeInitProc = safeInitProc;
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pkgPtr->nextPtr = firstPackagePtr;
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firstPackagePtr = pkgPtr;
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}
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/*
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* Invoke the package's initialization procedure (either the
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* normal one or the safe one, depending on whether or not the
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* interpreter is safe).
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*/
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if (Tcl_IsSafe(target)) {
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if (pkgPtr->safeInitProc != NULL) {
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code = (*pkgPtr->safeInitProc)(target);
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} else {
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Tcl_AppendResult(interp,
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"can't use package in a safe interpreter: ",
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"no ", pkgPtr->packageName, "_SafeInit procedure",
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(char *) NULL);
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code = TCL_ERROR;
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goto done;
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}
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} else {
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code = (*pkgPtr->initProc)(target);
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}
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if ((code == TCL_ERROR) && (target != interp)) {
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/*
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* An error occurred, so transfer error information from the
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* destination interpreter back to our interpreter. Must clear
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* interp's result before calling Tcl_AddErrorInfo, since
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* Tcl_AddErrorInfo will store the interp's result in errorInfo
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* before appending target's $errorInfo; we've already got
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* everything we need in target's $errorInfo.
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*/
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/*
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* It is (abusively) assumed that errorInfo and errorCode vars exists.
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* we changed SetVar2 to accept NULL values to avoid crashes. --dl
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*/
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Tcl_ResetResult(interp);
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Tcl_AddErrorInfo(interp, Tcl_GetVar2(target,
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"errorInfo", (char *) NULL, TCL_GLOBAL_ONLY));
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Tcl_SetVar2(interp, "errorCode", (char *) NULL,
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Tcl_GetVar2(target, "errorCode", (char *) NULL,
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TCL_GLOBAL_ONLY), TCL_GLOBAL_ONLY);
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Tcl_SetResult(interp, target->result, TCL_VOLATILE);
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}
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/*
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* Record the fact that the package has been loaded in the
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* target interpreter.
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*/
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if (code == TCL_OK) {
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/*
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* Refetch ipFirstPtr: loading the package may have introduced
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* additional static packages at the head of the linked list!
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*/
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ipFirstPtr = (InterpPackage *) Tcl_GetAssocData(target, "tclLoad",
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(Tcl_InterpDeleteProc **) NULL);
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ipPtr = (InterpPackage *) ckalloc(sizeof(InterpPackage));
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ipPtr->pkgPtr = pkgPtr;
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ipPtr->nextPtr = ipFirstPtr;
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Tcl_SetAssocData(target, "tclLoad", LoadCleanupProc,
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(ClientData) ipPtr);
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}
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done:
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Tcl_DStringFree(&pkgName);
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Tcl_DStringFree(&initName);
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Tcl_DStringFree(&safeInitName);
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Tcl_DStringFree(&fileName);
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return code;
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}
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/*
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*----------------------------------------------------------------------
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*
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* Tcl_StaticPackage --
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*
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* This procedure is invoked to indicate that a particular
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* package has been linked statically with an application.
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*
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* Results:
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* None.
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*
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* Side effects:
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* Once this procedure completes, the package becomes loadable
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* via the "load" command with an empty file name.
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*
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*----------------------------------------------------------------------
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*/
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void
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Tcl_StaticPackage(interp, pkgName, initProc, safeInitProc)
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Tcl_Interp *interp; /* If not NULL, it means that the
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* package has already been loaded
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* into the given interpreter by
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* calling the appropriate init proc. */
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char *pkgName; /* Name of package (must be properly
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* capitalized: first letter upper
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* case, others lower case). */
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Tcl_PackageInitProc *initProc; /* Procedure to call to incorporate
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* this package into a trusted
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* interpreter. */
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Tcl_PackageInitProc *safeInitProc; /* Procedure to call to incorporate
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* this package into a safe interpreter
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* (one that will execute untrusted
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* scripts). NULL means the package
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* can't be used in safe
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* interpreters. */
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{
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LoadedPackage *pkgPtr;
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InterpPackage *ipPtr, *ipFirstPtr;
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/*
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* Check to see if someone else has already reported this package as
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* statically loaded. If this call is redundant then just return.
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*/
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for (pkgPtr = firstPackagePtr; pkgPtr != NULL; pkgPtr = pkgPtr->nextPtr) {
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if ((pkgPtr->initProc == initProc)
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&& (pkgPtr->safeInitProc == safeInitProc)
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&& (strcmp(pkgPtr->packageName, pkgName) == 0)) {
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return;
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}
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}
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if (firstPackagePtr == NULL) {
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Tcl_CreateExitHandler(LoadExitProc, (ClientData) NULL);
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}
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pkgPtr = (LoadedPackage *) ckalloc(sizeof(LoadedPackage));
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pkgPtr->fileName = (char *) ckalloc((unsigned) 1);
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pkgPtr->fileName[0] = 0;
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pkgPtr->packageName = (char *) ckalloc((unsigned)
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(strlen(pkgName) + 1));
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strcpy(pkgPtr->packageName, pkgName);
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pkgPtr->initProc = initProc;
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pkgPtr->safeInitProc = safeInitProc;
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pkgPtr->nextPtr = firstPackagePtr;
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firstPackagePtr = pkgPtr;
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if (interp != NULL) {
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ipFirstPtr = (InterpPackage *) Tcl_GetAssocData(interp, "tclLoad",
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(Tcl_InterpDeleteProc **) NULL);
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ipPtr = (InterpPackage *) ckalloc(sizeof(InterpPackage));
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ipPtr->pkgPtr = pkgPtr;
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ipPtr->nextPtr = ipFirstPtr;
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Tcl_SetAssocData(interp, "tclLoad", LoadCleanupProc,
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(ClientData) ipPtr);
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}
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}
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/*
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*----------------------------------------------------------------------
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*
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* TclGetLoadedPackages --
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*
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* This procedure returns information about all of the files
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* that are loaded (either in a particular intepreter, or
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* for all interpreters).
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*
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* Results:
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* The return value is a standard Tcl completion code. If
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* successful, a list of lists is placed in interp->result.
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* Each sublist corresponds to one loaded file; its first
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* element is the name of the file (or an empty string for
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* something that's statically loaded) and the second element
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* is the name of the package in that file.
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*
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* Side effects:
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* None.
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*
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*----------------------------------------------------------------------
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*/
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int
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TclGetLoadedPackages(interp, targetName)
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Tcl_Interp *interp; /* Interpreter in which to return
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* information or error message. */
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char *targetName; /* Name of target interpreter or NULL.
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* If NULL, return info about all interps;
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* otherwise, just return info about this
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* interpreter. */
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{
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Tcl_Interp *target;
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LoadedPackage *pkgPtr;
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InterpPackage *ipPtr;
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char *prefix;
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|
||
if (targetName == NULL) {
|
||
/*
|
||
* Return information about all of the available packages.
|
||
*/
|
||
|
||
prefix = "{";
|
||
for (pkgPtr = firstPackagePtr; pkgPtr != NULL;
|
||
pkgPtr = pkgPtr->nextPtr) {
|
||
Tcl_AppendResult(interp, prefix, (char *) NULL);
|
||
Tcl_AppendElement(interp, pkgPtr->fileName);
|
||
Tcl_AppendElement(interp, pkgPtr->packageName);
|
||
Tcl_AppendResult(interp, "}", (char *) NULL);
|
||
prefix = " {";
|
||
}
|
||
return TCL_OK;
|
||
}
|
||
|
||
/*
|
||
* Return information about only the packages that are loaded in
|
||
* a given interpreter.
|
||
*/
|
||
|
||
target = Tcl_GetSlave(interp, targetName);
|
||
if (target == NULL) {
|
||
Tcl_AppendResult(interp, "couldn't find slave interpreter named \"",
|
||
targetName, "\"", (char *) NULL);
|
||
return TCL_ERROR;
|
||
}
|
||
ipPtr = (InterpPackage *) Tcl_GetAssocData(target, "tclLoad",
|
||
(Tcl_InterpDeleteProc **) NULL);
|
||
prefix = "{";
|
||
for ( ; ipPtr != NULL; ipPtr = ipPtr->nextPtr) {
|
||
pkgPtr = ipPtr->pkgPtr;
|
||
Tcl_AppendResult(interp, prefix, (char *) NULL);
|
||
Tcl_AppendElement(interp, pkgPtr->fileName);
|
||
Tcl_AppendElement(interp, pkgPtr->packageName);
|
||
Tcl_AppendResult(interp, "}", (char *) NULL);
|
||
prefix = " {";
|
||
}
|
||
return TCL_OK;
|
||
}
|
||
|
||
/*
|
||
*----------------------------------------------------------------------
|
||
*
|
||
* LoadCleanupProc --
|
||
*
|
||
* This procedure is called to delete all of the InterpPackage
|
||
* structures for an interpreter when the interpreter is deleted.
|
||
* It gets invoked via the Tcl AssocData mechanism.
|
||
*
|
||
* Results:
|
||
* None.
|
||
*
|
||
* Side effects:
|
||
* Storage for all of the InterpPackage procedures for interp
|
||
* get deleted.
|
||
*
|
||
*----------------------------------------------------------------------
|
||
*/
|
||
|
||
static void
|
||
LoadCleanupProc(clientData, interp)
|
||
ClientData clientData; /* Pointer to first InterpPackage structure
|
||
* for interp. */
|
||
Tcl_Interp *interp; /* Interpreter that is being deleted. */
|
||
{
|
||
InterpPackage *ipPtr, *nextPtr;
|
||
|
||
ipPtr = (InterpPackage *) clientData;
|
||
while (ipPtr != NULL) {
|
||
nextPtr = ipPtr->nextPtr;
|
||
ckfree((char *) ipPtr);
|
||
ipPtr = nextPtr;
|
||
}
|
||
}
|
||
|
||
/*
|
||
*----------------------------------------------------------------------
|
||
*
|
||
* LoadExitProc --
|
||
*
|
||
* This procedure is invoked just before the application exits.
|
||
* It frees all of the LoadedPackage structures.
|
||
*
|
||
* Results:
|
||
* None.
|
||
*
|
||
* Side effects:
|
||
* Memory is freed.
|
||
*
|
||
*----------------------------------------------------------------------
|
||
*/
|
||
|
||
static void
|
||
LoadExitProc(clientData)
|
||
ClientData clientData; /* Not used. */
|
||
{
|
||
LoadedPackage *pkgPtr;
|
||
|
||
while (firstPackagePtr != NULL) {
|
||
pkgPtr = firstPackagePtr;
|
||
firstPackagePtr = pkgPtr->nextPtr;
|
||
ckfree(pkgPtr->fileName);
|
||
ckfree(pkgPtr->packageName);
|
||
ckfree((char *) pkgPtr);
|
||
}
|
||
}
|