/* 
/*
 * tclLoadDyld.c --
 *
 *     This procedure provides a version of the TclLoadFile that
 *     works with Apple's dyld dynamic loading.  This file
 *     provided by Wilfredo Sanchez (wsanchez@apple.com).
 *	This procedure provides a version of the TclLoadFile that works with
 *	Apple's dyld dynamic loading.
 *	Original version of his file (now superseded long ago) provided by
 *	Wilfredo Sanchez (wsanchez@apple.com).
 *     This works on Mac OS X.
 *
 * Copyright (c) 1995 Apple Computer, Inc.
 * Copyright (c) 2005 Daniel A. Steffen <das@users.sourceforge.net>
 *
 * See the file "license.terms" for information on usage and redistribution
 * of this file, and for a DISCLAIMER OF ALL WARRANTIES.
 * See the file "license.terms" for information on usage and redistribution of
 * this file, and for a DISCLAIMER OF ALL WARRANTIES.
 *
 * RCS: @(#) $Id: tclLoadDyld.c,v 1.15.2.2 2005/07/12 20:37:29 kennykb Exp $
 * RCS: @(#) $Id: tclLoadDyld.c,v 1.15.2.3 2005/08/02 18:16:54 dgp Exp $
 */

#include "tclInt.h"
#include <mach-o/dyld.h>
#include <mach/mach.h>

typedef struct Tcl_DyldModuleHandle {
    struct Tcl_DyldModuleHandle *nextModuleHandle;
    struct Tcl_DyldModuleHandle *nextPtr;
    NSModule module;
} Tcl_DyldModuleHandle;

typedef struct Tcl_DyldLoadHandle {
    CONST struct mach_header *dyld_lib;
    Tcl_DyldModuleHandle *firstModuleHandle;
    CONST struct mach_header *dyldLibHeader;
    Tcl_DyldModuleHandle *modulePtr;
} Tcl_DyldLoadHandle;

#ifdef TCL_LOAD_FROM_MEMORY
typedef struct ThreadSpecificData {
     int haveLoadMemory;
    int haveLoadMemory;
} ThreadSpecificData;

static Tcl_ThreadDataKey dataKey;
#endif

/*
 *----------------------------------------------------------------------
 *
 * DyldOFIErrorMsg --
 *
 *	Converts a numerical NSObjectFileImage error into an
 *	error message string.
 *	Converts a numerical NSObjectFileImage error into an error message
 *	string.
 *
 * Results:
 *     Error message string. 
 *	Error message string.
 *
 * Side effects:
 *     None.
 *	None.
 *
 *----------------------------------------------------------------------
 */

static CONST char* DyldOFIErrorMsg(int err) {
static CONST char*
    CONST char *ofi_msg = NULL;
    
DyldOFIErrorMsg(int err) {
    if (err != NSObjectFileImageSuccess) {
        switch(err) {
        case NSObjectFileImageFailure:
            ofi_msg = "object file setup failure";
    switch(err) {
    case NSObjectFileImageSuccess:
	return NULL;
    case NSObjectFileImageFailure:
	return "object file setup failure";
            break;
        case NSObjectFileImageInappropriateFile:
            ofi_msg = "not a Mach-O MH_BUNDLE file";
    case NSObjectFileImageInappropriateFile:
	return "not a Mach-O MH_BUNDLE file";
            break;
        case NSObjectFileImageArch:
            ofi_msg = "no object for this architecture";
    case NSObjectFileImageArch:
	return "no object for this architecture";
            break;
        case NSObjectFileImageFormat:
            ofi_msg = "bad object file format";
    case NSObjectFileImageFormat:
	return "bad object file format";
            break;
        case NSObjectFileImageAccess:
            ofi_msg = "can't read object file";
    case NSObjectFileImageAccess:
	return "can't read object file";
            break;
        default:
            ofi_msg = "unknown error";
    default:
	return "unknown error";
            break;
        }
    }
    }
    return ofi_msg;
}

/*
 *----------------------------------------------------------------------
 *
 * TclpDlopen --
 *
 *	Dynamically loads a binary code file into memory and returns
 *	a handle to the new code.
 *	Dynamically loads a binary code file into memory and returns a handle
 *	to the new code.
 *
 * Results:
 *     A standard Tcl completion code.  If an error occurs, an error
 *     message is left in the interpreter's result. 
 *	A standard Tcl completion code. If an error occurs, an error message
 *	is left in the interpreter's result.
 *
 * Side effects:
 *     New code suddenly appears in memory.
 *	New code suddenly appears in memory.
 *
 *----------------------------------------------------------------------
 */

MODULE_SCOPE int
TclpDlopen(interp, pathPtr, loadHandle, unloadProcPtr)
    Tcl_Interp *interp;		/* Used for error reporting. */
    Tcl_Obj *pathPtr;		/* Name of the file containing the desired
				 * code (UTF-8). */
    Tcl_LoadHandle *loadHandle;	/* Filled with token for dynamically loaded
				 * file which will be passed back to 
				 * file which will be passed back to
				 * (*unloadProcPtr)() to unload the file. */
    Tcl_FSUnloadFileProc **unloadProcPtr;	
    Tcl_FSUnloadFileProc **unloadProcPtr;
				/* Filled with address of Tcl_FSUnloadFileProc
				 * function which should be used for
				 * this file. */
				 * function which should be used for this
				 * file. */
{
    Tcl_DyldLoadHandle *dyldLoadHandle;
    CONST struct mach_header *dyld_lib;
    NSObjectFileImage dyld_ofi = NULL;
    Tcl_DyldModuleHandle *dyldModuleHandle = NULL;
    CONST struct mach_header *dyldLibHeader;
    NSObjectFileImage dyldObjFileImage = NULL;
    Tcl_DyldModuleHandle *modulePtr = NULL;
    CONST char *native;

    /* 
     * First try the full path the user gave us.  This is particularly
     * important if the cwd is inside a vfs, and we are trying to load
     * using a relative path.
    /*
     * First try the full path the user gave us. This is particularly
     * important if the cwd is inside a vfs, and we are trying to load using a
     * relative path.
     */

    native = Tcl_FSGetNativePath(pathPtr);
    dyld_lib = NSAddImage(native, 
			  NSADDIMAGE_OPTION_WITH_SEARCHING | 
			  NSADDIMAGE_OPTION_RETURN_ON_ERROR);
    
    if (!dyld_lib) {
        NSLinkEditErrors editError;
        CONST char *name, *msg, *ofi_msg = NULL;
        
        NSLinkEditError(&editError, &errno, &name, &msg);
        if (editError == NSLinkEditFileAccessError) {
            /* The requested file was not found: 
    dyldLibHeader = NSAddImage(native, NSADDIMAGE_OPTION_WITH_SEARCHING |
	    NSADDIMAGE_OPTION_RETURN_ON_ERROR);

    if (!dyldLibHeader) {
	NSLinkEditErrors editError;
	int errorNumber;
	CONST char *name, *msg, *objFileImageErrMsg = NULL;

	NSLinkEditError(&editError, &errorNumber, &name, &msg);

	if (editError == NSLinkEditFileAccessError) {
	    /*
	     * The requested file was not found. Let the OS loader examine the
             * let the OS loader examine the binary search path for
             * whatever string the user gave us which hopefully refers
             * to a file on the binary path
             */
            Tcl_DString ds;
            char *fileName = Tcl_GetString(pathPtr);
            CONST char *native = Tcl_UtfToExternalDString(NULL, fileName, -1, &ds);
            dyld_lib = NSAddImage(native, 
                                  NSADDIMAGE_OPTION_WITH_SEARCHING | 
                                  NSADDIMAGE_OPTION_RETURN_ON_ERROR);
            Tcl_DStringFree(&ds);
            if (!dyld_lib) {
                NSLinkEditError(&editError, &errno, &name, &msg);
            }
        } else if ((editError == NSLinkEditFileFormatError && errno == EBADMACHO)) {
            /* The requested file was found but was not of type MH_DYLIB, 
             * attempt to load it as a MH_BUNDLE: */
            NSObjectFileImageReturnCode err;
            err = NSCreateObjectFileImageFromFile(native, &dyld_ofi);
            ofi_msg = DyldOFIErrorMsg(err);
         }
        if (!dyld_lib && !dyld_ofi) {
            Tcl_AppendResult(interp, msg, (char *) NULL);
            if (ofi_msg) {
                Tcl_AppendResult(interp, "NSCreateObjectFileImageFromFile() error: ",
                        ofi_msg, (char *) NULL);
            }
            return TCL_ERROR;
        }
	     * binary search path for whatever string the user gave us which
	     * hopefully refers to a file on the binary path.
	     */

	    Tcl_DString ds;
	    char *fileName = Tcl_GetString(pathPtr);
	    CONST char *native =
		    Tcl_UtfToExternalDString(NULL, fileName, -1, &ds);

	    dyldLibHeader = NSAddImage(native, NSADDIMAGE_OPTION_WITH_SEARCHING
		    | NSADDIMAGE_OPTION_RETURN_ON_ERROR);
	    Tcl_DStringFree(&ds);
	    if (!dyldLibHeader) {
		NSLinkEditError(&editError, &errorNumber, &name, &msg);
	    }
	} else if ((editError==NSLinkEditFileFormatError && errorNumber==EBADMACHO)
		|| editError == NSLinkEditOtherError){
	    /*
	     * The requested file was found but was not of type MH_DYLIB,
	     * attempt to load it as a MH_BUNDLE.
	     */

	    NSObjectFileImageReturnCode err =
		    NSCreateObjectFileImageFromFile(native, &dyldObjFileImage);
	    objFileImageErrMsg = DyldOFIErrorMsg(err);
	}

	if (!dyldLibHeader && !dyldObjFileImage) {
	    Tcl_AppendResult(interp, msg, (char *) NULL);
	    if (msg && *msg) {
		Tcl_AppendResult(interp, "\n", (char *) NULL);
	    }
	    if (objFileImageErrMsg) {
		Tcl_AppendResult(interp,
			"NSCreateObjectFileImageFromFile() error: ",
			objFileImageErrMsg, (char *) NULL);
	    }
	    return TCL_ERROR;
	}
    }
    
    if (dyld_ofi) {
        NSModule module;
        module = NSLinkModule(dyld_ofi, native, NSLINKMODULE_OPTION_BINDNOW |
                                                NSLINKMODULE_OPTION_RETURN_ON_ERROR);
        NSDestroyObjectFileImage(dyld_ofi);
        if (module) {

    if (dyldObjFileImage) {
	NSModule module;

	module = NSLinkModule(dyldObjFileImage, native,
		NSLINKMODULE_OPTION_BINDNOW
		| NSLINKMODULE_OPTION_RETURN_ON_ERROR);
	NSDestroyObjectFileImage(dyldObjFileImage);

	if (!module) {
            dyldModuleHandle = (Tcl_DyldModuleHandle *) 
                    ckalloc(sizeof(Tcl_DyldModuleHandle));
            if (!dyldModuleHandle) return TCL_ERROR;
            dyldModuleHandle->module = module;
            dyldModuleHandle->nextModuleHandle = NULL;
        } else {
            NSLinkEditErrors editError;
            CONST char *name, *msg;
            NSLinkEditError(&editError, &errno, &name, &msg);
            Tcl_AppendResult(interp, msg, (char *) NULL);
            return TCL_ERROR;
        }
    }
    dyldLoadHandle = (Tcl_DyldLoadHandle *) ckalloc(sizeof(Tcl_DyldLoadHandle));
    if (!dyldLoadHandle) return TCL_ERROR;
    dyldLoadHandle->dyld_lib = dyld_lib;
    dyldLoadHandle->firstModuleHandle = dyldModuleHandle;
	    NSLinkEditErrors editError;
	    int errorNumber;
	    CONST char *name, *msg;

	    NSLinkEditError(&editError, &errorNumber, &name, &msg);
	    Tcl_AppendResult(interp, msg, (char *) NULL);
	    return TCL_ERROR;
	}

	modulePtr = (Tcl_DyldModuleHandle *)
		ckalloc(sizeof(Tcl_DyldModuleHandle));
	modulePtr->module = module;
	modulePtr->nextPtr = NULL;
    }

    dyldLoadHandle = (Tcl_DyldLoadHandle *)
	    ckalloc(sizeof(Tcl_DyldLoadHandle));
    dyldLoadHandle->dyldLibHeader = dyldLibHeader;
    dyldLoadHandle->modulePtr = modulePtr;
    *loadHandle = (Tcl_LoadHandle) dyldLoadHandle;
    *unloadProcPtr = &TclpUnloadFile;
    return TCL_OK;
}

/*
 *----------------------------------------------------------------------
 *
 * TclpFindSymbol --
 *
 *	Looks up a symbol, by name, through a handle associated with
 *	a previously loaded piece of code (shared library).
 *	Looks up a symbol, by name, through a handle associated with a
 *	previously loaded piece of code (shared library).
 *
 * Results:
 *	Returns a pointer to the function associated with 'symbol' if
 *	it is found.  Otherwise returns NULL and may leave an error
 *	message in the interp's result.
 *	Returns a pointer to the function associated with 'symbol' if it is
 *	found. Otherwise returns NULL and may leave an error message in the
 *	interp's result.
 *
 *----------------------------------------------------------------------
 */

MODULE_SCOPE Tcl_PackageInitProc*
TclpFindSymbol(interp, loadHandle, symbol) 
    Tcl_Interp *interp;
    Tcl_LoadHandle loadHandle;
    CONST char *symbol;
TclpFindSymbol(interp, loadHandle, symbol)
    Tcl_Interp *interp;		/* For error reporting. */
    Tcl_LoadHandle loadHandle;	/* Handle from TclpDlopen. */
    CONST char *symbol;		/* Symbol name to look up. */
{
    NSSymbol nsSymbol;
    CONST char *native;
    Tcl_DString newName, ds;
    Tcl_PackageInitProc* proc = NULL;
    Tcl_DyldLoadHandle *dyldLoadHandle = (Tcl_DyldLoadHandle *) loadHandle;

    /* 
    /*
     * dyld adds an underscore to the beginning of symbol names.
     */

    native = Tcl_UtfToExternalDString(NULL, symbol, -1, &ds);
    Tcl_DStringInit(&newName);
    Tcl_DStringAppend(&newName, "_", 1);
    native = Tcl_DStringAppend(&newName, native, -1);

    if (dyldLoadHandle->dyld_lib) {
        nsSymbol = NSLookupSymbolInImage(dyldLoadHandle->dyld_lib, native, 
            NSLOOKUPSYMBOLINIMAGE_OPTION_BIND_NOW | 
            NSLOOKUPSYMBOLINIMAGE_OPTION_RETURN_ON_ERROR);
        if(nsSymbol) {
            /* until dyld supports unloading of MY_DYLIB binaries, the
             * following is not needed: */
    if (dyldLoadHandle->dyldLibHeader) {
	nsSymbol = NSLookupSymbolInImage(dyldLoadHandle->dyldLibHeader, native,
		NSLOOKUPSYMBOLINIMAGE_OPTION_BIND_NOW |
		NSLOOKUPSYMBOLINIMAGE_OPTION_RETURN_ON_ERROR);
	if (nsSymbol) {
	    /*
	     * Until dyld supports unloading of MY_DYLIB binaries, the
	     * following is not needed.
	     */

#ifdef DYLD_SUPPORTS_DYLIB_UNLOADING
            NSModule module = NSModuleForSymbol(nsSymbol);
            Tcl_DyldModuleHandle *dyldModuleHandle = dyldLoadHandle->firstModuleHandle;
            while (dyldModuleHandle) {
                if (module == dyldModuleHandle->module) break;
                dyldModuleHandle = dyldModuleHandle->nextModuleHandle;
            }
            if (!dyldModuleHandle) {
                dyldModuleHandle = (Tcl_DyldModuleHandle *)
                        ckalloc(sizeof(Tcl_DyldModuleHandle));
	    NSModule module = NSModuleForSymbol(nsSymbol);
	    Tcl_DyldModuleHandle *modulePtr = dyldLoadHandle->modulePtr;

	    while (modulePtr != NULL) {
		if (module == modulePtr->module) {
		    break;
		}
		modulePtr = modulePtr->nextPtr;
	    }
	    if (modulePtr == NULL) {
		modulePtr = (Tcl_DyldModuleHandle *)
			ckalloc(sizeof(Tcl_DyldModuleHandle));
                if (dyldModuleHandle) {
                    dyldModuleHandle->module = module;
		modulePtr->module = module;
                    dyldModuleHandle->nextModuleHandle = 
                            dyldLoadHandle->firstModuleHandle;
                    dyldLoadHandle->firstModuleHandle = dyldModuleHandle;
                }
		modulePtr->nextPtr = dyldLoadHandle->modulePtr;
		dyldLoadHandle->modulePtr = modulePtr;
	    }
            }
#endif /* DYLD_SUPPORTS_DYLIB_UNLOADING */

       } else {
            NSLinkEditErrors editError;
            CONST char *name, *msg;
            NSLinkEditError(&editError, &errno, &name, &msg);
            Tcl_AppendResult(interp, msg, (char *) NULL);
        }
	} else {
	    NSLinkEditErrors editError;
	    int errorNumber;
	    CONST char *name, *msg;

	    NSLinkEditError(&editError, &errorNumber, &name, &msg);
	    Tcl_AppendResult(interp, msg, (char *) NULL);
	}
    } else {
        nsSymbol = NSLookupSymbolInModule(dyldLoadHandle->firstModuleHandle->module, 
                                          native);
	nsSymbol = NSLookupSymbolInModule(dyldLoadHandle->modulePtr->module,
		native);
    }
    if(nsSymbol) {
        proc = NSAddressOfSymbol(nsSymbol);
    if (nsSymbol) {
	proc = NSAddressOfSymbol(nsSymbol);
    }
    Tcl_DStringFree(&newName);
    Tcl_DStringFree(&ds);
    

    return proc;
}

/*
 *----------------------------------------------------------------------
 *
 * TclpUnloadFile --
 *
 *     Unloads a dynamically loaded binary code file from memory.
 *     Code pointers in the formerly loaded file are no longer valid
 *     after calling this function.
 *	Unloads a dynamically loaded binary code file from memory. Code
 *	pointers in the formerly loaded file are no longer valid after calling
 *	this function.
 *
 * Results:
 *     None.
 *	None.
 *
 * Side effects:
 *     Code dissapears from memory.
 *     Note that dyld currently only supports unloading of binaries of
 *     type MH_BUNDLE loaded with NSLinkModule() in TclpDlopen() above.
 *	Code dissapears from memory. Note that dyld currently only supports
 *	unloading of binaries of type MH_BUNDLE loaded with NSLinkModule() in
 *	TclpDlopen() above.
 *
 *----------------------------------------------------------------------
 */

MODULE_SCOPE void
TclpUnloadFile(loadHandle)
    Tcl_LoadHandle loadHandle;	/* loadHandle returned by a previous call
				 * to TclpDlopen().  The loadHandle is 
				 * a token that represents the loaded 
    Tcl_LoadHandle loadHandle;	/* loadHandle returned by a previous call to
				 * TclpDlopen(). The loadHandle is a token
				 * that represents the loaded file. */
				 * file. */
{
    Tcl_DyldLoadHandle *dyldLoadHandle = (Tcl_DyldLoadHandle *) loadHandle;
    Tcl_DyldModuleHandle *dyldModuleHandle = dyldLoadHandle->firstModuleHandle;
    void *ptr;
    Tcl_DyldModuleHandle *modulePtr = dyldLoadHandle->modulePtr;

    while (modulePtr != NULL) {
	void *ptr;

    while (dyldModuleHandle) {
	NSUnLinkModule(dyldModuleHandle->module, 
	               NSUNLINKMODULE_OPTION_RESET_LAZY_REFERENCES);
	ptr = dyldModuleHandle;
	dyldModuleHandle = dyldModuleHandle->nextModuleHandle;
	NSUnLinkModule(modulePtr->module,
		NSUNLINKMODULE_OPTION_RESET_LAZY_REFERENCES);
	ptr = modulePtr;
	modulePtr = modulePtr->nextPtr;
	ckfree(ptr);
    }
    ckfree((char*) dyldLoadHandle);
}

/*
 *----------------------------------------------------------------------
 *
 * TclGuessPackageName --
 *
 *     If the "load" command is invoked without providing a package
 *     name, this procedure is invoked to try to figure it out.
 *	If the "load" command is invoked without providing a package name,
 *	this procedure is invoked to try to figure it out.
 *
 * Results:
 *     Always returns 0 to indicate that we couldn't figure out a
 *     package name;  generic code will then try to guess the package
 *     from the file name.  A return value of 1 would have meant that
 *     we figured out the package name and put it in bufPtr.
 *	Always returns 0 to indicate that we couldn't figure out a package
 *	name; generic code will then try to guess the package from the file
 *	name. A return value of 1 would have meant that we figured out the
 *	package name and put it in bufPtr.
 *
 * Side effects:
 *     None.
 *	None.
 *
 *----------------------------------------------------------------------
 */

MODULE_SCOPE int
TclGuessPackageName(fileName, bufPtr)
    CONST char *fileName;      /* Name of file containing package (already
				* translated to local form if needed). */
    Tcl_DString *bufPtr;       /* Initialized empty dstring.  Append
				* package name to this if possible. */
    CONST char *fileName;	/* Name of file containing package (already
				 * translated to local form if needed). */
    Tcl_DString *bufPtr;	/* Initialized empty dstring. Append package
				 * name to this if possible. */
{
    return 0;
}

#ifdef TCL_LOAD_FROM_MEMORY
/*
 *----------------------------------------------------------------------
 *
 * TclpLoadMemoryGetBuffer --
 *
 *	Allocate a buffer that can be used with TclpLoadMemory() below.
 *
 * Results:
 *     Pointer to allocated buffer or NULL if an error occurs.
 *	Pointer to allocated buffer or NULL if an error occurs.
 *
 * Side effects:
 *     Buffer is allocated.
 *	Buffer is allocated.
 *
 *----------------------------------------------------------------------
 */

MODULE_SCOPE void*
TclpLoadMemoryGetBuffer(interp, size)
    Tcl_Interp *interp;		/* Used for error reporting. */
    int size;                   /* Size of desired buffer */
    int size;			/* Size of desired buffer. */
{
    ThreadSpecificData *tsdPtr = TCL_TSD_INIT(&dataKey);
    void * buffer = NULL;
    
    void *buffer = NULL;

    if (!tsdPtr->haveLoadMemory) {
	/*
        /* NSCreateObjectFileImageFromMemory is available but always 
         * fails prior to Darwin 7 */
        struct utsname name;
        if (!uname(&name)) {
            long release = strtol(name.release, NULL, 10);
            tsdPtr->haveLoadMemory = (release >= 7) ? 1 : -1;
        }
	 * NSCreateObjectFileImageFromMemory is available but always fails
	 * prior to Darwin 7.
	 */

	struct utsname name;

	if (!uname(&name)) {
	    long release = strtol(name.release, NULL, 10);
	    tsdPtr->haveLoadMemory = (release >= 7) ? 1 : -1;
	}
    }
    if (tsdPtr->haveLoadMemory > 0) {
	/*
        /* We must allocate the  buffer using vm_allocate, because
         * NSCreateObjectFileImageFromMemory  will dispose of it
         * using vm_deallocate.
         */
        int err = vm_allocate(mach_task_self(), 
                              (vm_address_t*)&buffer, size, 1);
	 * We must allocate the buffer using vm_allocate, because
	 * NSCreateObjectFileImageFromMemory will dispose of it using
	 * vm_deallocate.
	 */

	if (vm_allocate(mach_task_self(), (vm_address_t *) &buffer, size, 1)) {
        if (err) {
            buffer = NULL;
        }
	    buffer = NULL;
	}
    }
    return buffer;
}

/*
 *----------------------------------------------------------------------
 *
 * TclpLoadMemory --
 *
 *	Dynamically loads binary code file from memory and returns
 *	a handle to the new code.
 *	Dynamically loads binary code file from memory and returns a handle to
 *	the new code.
 *
 * Results:
 *     A standard Tcl completion code.  If an error occurs, an error
 *     message is left in the interpreter's result. 
 *	A standard Tcl completion code. If an error occurs, an error message
 *	is left in the interpreter's result.
 *
 * Side effects:
 *     New code is loaded from memory.
 *	New code is loaded from memory.
 *
 *----------------------------------------------------------------------
 */

MODULE_SCOPE int
TclpLoadMemory(interp, buffer, size, codeSize, loadHandle, unloadProcPtr)
    Tcl_Interp *interp;		/* Used for error reporting. */
    void *buffer;		/* Buffer containing the desired code
				 * (allocated with TclpLoadMemoryGetBuffer). */
    int size;                   /* Allocation size of buffer. */
    int codeSize;               /* Size of code data read into buffer or -1 if
                                 * an error occurred and the buffer should
                                 * just be freed. */
    int size;			/* Allocation size of buffer. */
    int codeSize;		/* Size of code data read into buffer or -1 if
				 * an error occurred and the buffer should
				 * just be freed. */
    Tcl_LoadHandle *loadHandle;	/* Filled with token for dynamically loaded
				 * file which will be passed back to 
				 * file which will be passed back to
				 * (*unloadProcPtr)() to unload the file. */
    Tcl_FSUnloadFileProc **unloadProcPtr;	
    Tcl_FSUnloadFileProc **unloadProcPtr;
				/* Filled with address of Tcl_FSUnloadFileProc
				 * function which should be used for
				 * this file. */
				 * function which should be used for this
				 * file. */
{
    Tcl_DyldLoadHandle *dyldLoadHandle;
    NSObjectFileImage dyld_ofi = NULL;
    Tcl_DyldModuleHandle *dyldModuleHandle;
    CONST char *ofi_msg = NULL;
    NSObjectFileImage dyldObjFileImage = NULL;
    Tcl_DyldModuleHandle *modulePtr;
    NSModule module;
    CONST char *objFileImageErrMsg = NULL;

    /*
     * Try to create an object file image that we can load from.
     */

    if (codeSize >= 0) {
        NSObjectFileImageReturnCode err;
        err = NSCreateObjectFileImageFromMemory(buffer, codeSize, &dyld_ofi);
        ofi_msg = DyldOFIErrorMsg(err);
	NSObjectFileImageReturnCode err = NSObjectFileImageSuccess;

#ifndef __LP64__
	struct mach_header *mh = buffer;
	if (codeSize < sizeof(struct mach_header) || mh->magic != MH_MAGIC
#else
	struct mach_header_64 *mh = buffer;
	if (codeSize < sizeof(struct mach_header_64) || mh->magic != MH_MAGIC_64
#endif
		|| mh->filetype != MH_BUNDLE) {
	    err = NSObjectFileImageInappropriateFile;
	}
	if (err == NSObjectFileImageSuccess) {
	    err = NSCreateObjectFileImageFromMemory(buffer, codeSize,
		    &dyldObjFileImage);
	}
	objFileImageErrMsg = DyldOFIErrorMsg(err);
    }
    if (!dyld_ofi) {
        vm_deallocate(mach_task_self(), (vm_address_t) buffer, size);
        if (ofi_msg) {
            Tcl_AppendResult(interp, "NSCreateObjectFileImageFromFile() error: ",
                    ofi_msg, (char *) NULL);
        }
        return TCL_ERROR;
    } else {

    /*
     * If it went wrong (or we were asked to just deallocate), get rid of the
     * memory block and create an error message.
     */

    if (dyldObjFileImage == NULL) {
	vm_deallocate(mach_task_self(), (vm_address_t) buffer, size);
	if (objFileImageErrMsg != NULL) {
	    Tcl_AppendResult(interp,
		    "NSCreateObjectFileImageFromFile() error: ",
		    objFileImageErrMsg, (char *) NULL);
	}
	return TCL_ERROR;
    }

    /*
     * Extract the module we want from the image of the object file.
     */

        NSModule module;
        module = NSLinkModule(dyld_ofi, "[Memory Based Bundle]", 
                NSLINKMODULE_OPTION_BINDNOW |NSLINKMODULE_OPTION_RETURN_ON_ERROR);
        NSDestroyObjectFileImage(dyld_ofi);
        if (module) {
    module = NSLinkModule(dyldObjFileImage, "[Memory Based Bundle]",
	    NSLINKMODULE_OPTION_BINDNOW | NSLINKMODULE_OPTION_RETURN_ON_ERROR);
    NSDestroyObjectFileImage(dyldObjFileImage);

    if (!module) {
            dyldModuleHandle = (Tcl_DyldModuleHandle *) 
                    ckalloc(sizeof(Tcl_DyldModuleHandle));
            if (!dyldModuleHandle) return TCL_ERROR;
            dyldModuleHandle->module = module;
            dyldModuleHandle->nextModuleHandle = NULL;
        } else {
            NSLinkEditErrors editError;
            CONST char *name, *msg;
            NSLinkEditError(&editError, &errno, &name, &msg);
            Tcl_AppendResult(interp, msg, (char *) NULL);
            return TCL_ERROR;
        }
    }
    dyldLoadHandle = (Tcl_DyldLoadHandle *) ckalloc(sizeof(Tcl_DyldLoadHandle));
    if (!dyldLoadHandle) return TCL_ERROR;
    dyldLoadHandle->dyld_lib = NULL;
    dyldLoadHandle->firstModuleHandle = dyldModuleHandle;
	NSLinkEditErrors editError;
	int errorNumber;
	CONST char *name, *msg;

	NSLinkEditError(&editError, &errorNumber, &name, &msg);
	Tcl_AppendResult(interp, msg, (char *) NULL);
	return TCL_ERROR;
    }

    /*
     * Stash the module reference within the load handle we create and return.
     */

    modulePtr = (Tcl_DyldModuleHandle *) ckalloc(sizeof(Tcl_DyldModuleHandle));
    modulePtr->module = module;
    modulePtr->nextPtr = NULL;

    dyldLoadHandle = (Tcl_DyldLoadHandle *)
	    ckalloc(sizeof(Tcl_DyldLoadHandle));
    dyldLoadHandle->dyldLibHeader = NULL;
    dyldLoadHandle->modulePtr = modulePtr;
    *loadHandle = (Tcl_LoadHandle) dyldLoadHandle;
    *unloadProcPtr = &TclpUnloadFile;
    return TCL_OK;
}
#endif

/*
 * Local Variables:
 * mode: c
 * c-basic-offset: 4
 * fill-column: 78
 * End:
 */