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Overview
Comment:Reduce the amount of ifdeffery somewhat by requiring at least OSX Tiger. That's now everyone we care to support, given that the version after is now not supported by Apple...
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SHA1: 1a67b9c45abaafe6711d4b4833669487dd5eafe3
User & Date: dkf 2012-08-04 12:09:26
Context
2012-08-04
13:04
more result generation conversion check-in: 6325d5dbea user: dkf tags: trunk
12:09
Reduce the amount of ifdeffery somewhat by requiring at least OSX Tiger. That's now everyone we care... check-in: 1a67b9c45a user: dkf tags: trunk
07:41
more result generation conversion check-in: 9a036eff3a user: dkf tags: trunk
Changes
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Changes to unix/tclLoadDyld.c.

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 * See the file "license.terms" for information on usage and redistribution of
 * this file, and for a DISCLAIMER OF ALL WARRANTIES.
 */

#include "tclInt.h"

#ifndef MODULE_SCOPE
#define MODULE_SCOPE extern
#endif

#ifndef TCL_DYLD_USE_DLFCN
/*
 * Use preferred dlfcn API on 10.4 and later
 */
#   if !defined(NO_DLFCN_H) && MAC_OS_X_VERSION_MAX_ALLOWED >= 1040


#	define TCL_DYLD_USE_DLFCN 1
#   else
#	define TCL_DYLD_USE_DLFCN 0
#   endif
#endif
#ifndef TCL_DYLD_USE_NSMODULE
/*
 * Use deprecated NSModule API only to support 10.3 and earlier:
 */
#   if MAC_OS_X_VERSION_MIN_REQUIRED < 1040
#	define TCL_DYLD_USE_NSMODULE 1
#   else
#	define TCL_DYLD_USE_NSMODULE 0
#   endif
#endif

#if TCL_DYLD_USE_DLFCN
#include <dlfcn.h>
#if defined(HAVE_WEAK_IMPORT) && MAC_OS_X_VERSION_MIN_REQUIRED < 1040
/*
 * Support for weakly importing dlfcn API.
 */
extern void *dlopen(const char *path, int mode) WEAK_IMPORT_ATTRIBUTE;
extern void *dlsym(void *handle, const char *symbol) WEAK_IMPORT_ATTRIBUTE;
extern int dlclose(void *handle) WEAK_IMPORT_ATTRIBUTE;
extern char *dlerror(void) WEAK_IMPORT_ATTRIBUTE;
#endif

#endif

#if TCL_DYLD_USE_NSMODULE || defined(TCL_LOAD_FROM_MEMORY)
#include <mach-o/dyld.h>
#include <mach-o/fat.h>
#include <mach-o/swap.h>
#include <mach-o/arch.h>
#include <libkern/OSByteOrder.h>
#include <mach/mach.h>
#include <stdbool.h>

typedef struct Tcl_DyldModuleHandle {
    struct Tcl_DyldModuleHandle *nextPtr;
    NSModule module;
} Tcl_DyldModuleHandle;
#endif /* TCL_DYLD_USE_NSMODULE */

typedef struct Tcl_DyldLoadHandle {
#if TCL_DYLD_USE_DLFCN
    void *dlHandle;
#endif
#if TCL_DYLD_USE_NSMODULE || defined(TCL_LOAD_FROM_MEMORY)
    const struct mach_header *dyldLibHeader;
    Tcl_DyldModuleHandle *modulePtr;
#endif
} Tcl_DyldLoadHandle;

#if (TCL_DYLD_USE_DLFCN && MAC_OS_X_VERSION_MIN_REQUIRED < 1040) || \
	defined(TCL_LOAD_FROM_MEMORY)
MODULE_SCOPE long tclMacOSXDarwinRelease;
#endif

#ifdef TCL_DEBUG_LOAD
#define TclLoadDbgMsg(m, ...) \
    do {								\
	fprintf(stderr, "%s:%d: %s(): " m ".\n",			\
		strrchr(__FILE__, '/')+1, __LINE__, __func__,		\
		##__VA_ARGS__);						\
    } while (0)
#else
#define TclLoadDbgMsg(m, ...)
#endif

/*
 * Static functions defined in this file.
 */

static void *		FindSymbol(Tcl_Interp *interp,
			    Tcl_LoadHandle loadHandle, const char *symbol);
static void		UnloadFile(Tcl_LoadHandle handle);

#if TCL_DYLD_USE_NSMODULE || defined(TCL_LOAD_FROM_MEMORY)
/*
 *----------------------------------------------------------------------
 *
 * DyldOFIErrorMsg --
 *
 *	Converts a numerical NSObjectFileImage error into an error message
 *	string.
 *
 * Results:
 *	Error message string.
 *
 * Side effects:
 *	None.
 *
 *----------------------------------------------------------------------
 */


static const char *
DyldOFIErrorMsg(
    int err)
{
    switch(err) {
    case NSObjectFileImageSuccess:
	return NULL;








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 * See the file "license.terms" for information on usage and redistribution of
 * this file, and for a DISCLAIMER OF ALL WARRANTIES.
 */

#include "tclInt.h"

#ifndef MODULE_SCOPE
#   define MODULE_SCOPE		extern
#endif


/*
 * Use preferred dlfcn API on 10.4 and later
 */

#ifndef TCL_DYLD_USE_DLFCN
#   ifdef NO_DLFCN_H
#	define TCL_DYLD_USE_DLFCN 0
#   else
#	define TCL_DYLD_USE_DLFCN 1
#   endif
#endif

/*
 * Use deprecated NSModule API only to support 10.3 and earlier:
 */

#ifndef TCL_DYLD_USE_NSMODULE

#   define TCL_DYLD_USE_NSMODULE 0

#endif




/*
 * Use includes for the API we're using.
 */




#if TCL_DYLD_USE_DLFCN
#   include <dlfcn.h>
#endif /* TCL_DYLD_USE_DLFCN */

#if TCL_DYLD_USE_NSMODULE || defined(TCL_LOAD_FROM_MEMORY)
#include <mach-o/dyld.h>
#include <mach-o/fat.h>
#include <mach-o/swap.h>
#include <mach-o/arch.h>
#include <libkern/OSByteOrder.h>
#include <mach/mach.h>


typedef struct Tcl_DyldModuleHandle {
    struct Tcl_DyldModuleHandle *nextPtr;
    NSModule module;
} Tcl_DyldModuleHandle;
#endif /* TCL_DYLD_USE_NSMODULE || TCL_LOAD_FROM_MEMORY */

typedef struct {

    void *dlHandle;

#if TCL_DYLD_USE_NSMODULE || defined(TCL_LOAD_FROM_MEMORY)
    const struct mach_header *dyldLibHeader;
    Tcl_DyldModuleHandle *modulePtr;
#endif
} Tcl_DyldLoadHandle;


#if TCL_DYLD_USE_DLFCN || defined(TCL_LOAD_FROM_MEMORY)
MODULE_SCOPE long	tclMacOSXDarwinRelease;











#endif

/*
 * Static functions defined in this file.
 */

static void *		FindSymbol(Tcl_Interp *interp,
			    Tcl_LoadHandle loadHandle, const char *symbol);
static void		UnloadFile(Tcl_LoadHandle handle);


/*
 *----------------------------------------------------------------------
 *
 * DyldOFIErrorMsg --
 *
 *	Converts a numerical NSObjectFileImage error into an error message
 *	string.
 *
 * Results:
 *	Error message string.
 *
 * Side effects:
 *	None.
 *
 *----------------------------------------------------------------------
 */

#if TCL_DYLD_USE_NSMODULE || defined(TCL_LOAD_FROM_MEMORY)
static const char *
DyldOFIErrorMsg(
    int err)
{
    switch(err) {
    case NSObjectFileImageSuccess:
	return NULL;
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	return "bad object file format";
    case NSObjectFileImageAccess:
	return "can't read object file";
    default:
	return "unknown error";
    }
}
#endif /* TCL_DYLD_USE_NSMODULE */

/*
 *----------------------------------------------------------------------
 *
 * TclpDlopen --
 *
 *	Dynamically loads a binary code file into memory and returns a handle








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	return "bad object file format";
    case NSObjectFileImageAccess:
	return "can't read object file";
    default:
	return "unknown error";
    }
}
#endif /* TCL_DYLD_USE_NSMODULE || TCL_LOAD_FROM_MEMORY */

/*
 *----------------------------------------------------------------------
 *
 * TclpDlopen --
 *
 *	Dynamically loads a binary code file into memory and returns a handle
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    Tcl_FSUnloadFileProc **unloadProcPtr)
				/* Filled with address of Tcl_FSUnloadFileProc
				 * function which should be used for this
				 * file. */
{
    Tcl_DyldLoadHandle *dyldLoadHandle;
    Tcl_LoadHandle newHandle;
#if TCL_DYLD_USE_DLFCN
    void *dlHandle = NULL;
#endif
#if TCL_DYLD_USE_NSMODULE || defined(TCL_LOAD_FROM_MEMORY)
    const struct mach_header *dyldLibHeader = NULL;
    Tcl_DyldModuleHandle *modulePtr = NULL;
#endif
#if TCL_DYLD_USE_NSMODULE
    NSLinkEditErrors editError;
    int errorNumber;
    const char *errorName, *objFileImageErrMsg = NULL;
#endif
    const char *errMsg = NULL;
    int result;
    Tcl_DString ds;
    char *fileName = NULL;
    const char *nativePath, *nativeFileName = NULL;

    /*
     * 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.
     */

    nativePath = Tcl_FSGetNativePath(pathPtr);



#if TCL_DYLD_USE_DLFCN
#if MAC_OS_X_VERSION_MIN_REQUIRED < 1040
    if (tclMacOSXDarwinRelease >= 8)
#endif
    {
    /*
     * Use (RTLD_NOW|RTLD_LOCAL) always, see [Bug #3216070]
     */

	dlHandle = dlopen(nativePath, RTLD_NOW | RTLD_LOCAL);
	if (!dlHandle) {
	    /*
	     * 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.
	     */

	    fileName = Tcl_GetString(pathPtr);
	    nativeFileName = Tcl_UtfToExternalDString(NULL, fileName, -1, &ds);
	    /*
	     * Use (RTLD_NOW|RTLD_LOCAL) always, see [Bug #3216070]
	     */
	    dlHandle = dlopen(nativeFileName, RTLD_NOW | RTLD_LOCAL);
	}

	if (dlHandle) {
	    TclLoadDbgMsg("dlopen() successful");
	} else {
	    errMsg = dlerror();
	    TclLoadDbgMsg("dlopen() failed: %s", errMsg);
	}
    }
    if (!dlHandle)
#endif /* TCL_DYLD_USE_DLFCN */
    {

#if TCL_DYLD_USE_NSMODULE
	dyldLibHeader = NSAddImage(nativePath,
		NSADDIMAGE_OPTION_RETURN_ON_ERROR);
	if (dyldLibHeader) {
	    TclLoadDbgMsg("NSAddImage() successful");
	} else {
	    NSLinkEditError(&editError, &errorNumber, &errorName, &errMsg);
	    if (editError == NSLinkEditFileAccessError) {
		/*
		 * The requested file was not found. 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.
		 */

		if (!fileName) {
		    fileName = Tcl_GetString(pathPtr);
		    nativeFileName = Tcl_UtfToExternalDString(NULL, fileName,
			    -1, &ds);
		}
		dyldLibHeader = NSAddImage(nativeFileName,
			NSADDIMAGE_OPTION_WITH_SEARCHING |
			NSADDIMAGE_OPTION_RETURN_ON_ERROR);
		if (dyldLibHeader) {
		    TclLoadDbgMsg("NSAddImage() successful");
		} else {
		    NSLinkEditError(&editError, &errorNumber, &errorName,
			    &errMsg);
		    TclLoadDbgMsg("NSAddImage() failed: %s", errMsg);
		}
	    } else if ((editError == NSLinkEditFileFormatError
		    && errorNumber == EBADMACHO)
		    || editError == NSLinkEditOtherError){
		NSObjectFileImageReturnCode err;
		NSObjectFileImage dyldObjFileImage;
		NSModule module;

		/*
		 * The requested file was found but was not of type MH_DYLIB,
		 * attempt to load it as a MH_BUNDLE.
		 */

		err = NSCreateObjectFileImageFromFile(nativePath,
			&dyldObjFileImage);
		if (err == NSObjectFileImageSuccess && dyldObjFileImage) {
		    TclLoadDbgMsg("NSCreateObjectFileImageFromFile() "
			    "successful");
		    module = NSLinkModule(dyldObjFileImage, nativePath,
			    NSLINKMODULE_OPTION_BINDNOW
			    | NSLINKMODULE_OPTION_RETURN_ON_ERROR);
		    NSDestroyObjectFileImage(dyldObjFileImage);
		    if (module) {
			modulePtr = ckalloc(sizeof(Tcl_DyldModuleHandle));
			modulePtr->module = module;
			modulePtr->nextPtr = NULL;
			TclLoadDbgMsg("NSLinkModule() successful");
		    } else {
			NSLinkEditError(&editError, &errorNumber, &errorName,
				&errMsg);
			TclLoadDbgMsg("NSLinkModule() failed: %s", errMsg);
		    }
		} else {
		    objFileImageErrMsg = DyldOFIErrorMsg(err);
		    TclLoadDbgMsg("NSCreateObjectFileImageFromFile() failed: "
			    "%s", objFileImageErrMsg);
		}
	    }
	}
#endif /* TCL_DYLD_USE_NSMODULE */
    }
    if (0
#if TCL_DYLD_USE_DLFCN
	    || dlHandle
#endif
#if TCL_DYLD_USE_NSMODULE
	    || dyldLibHeader || modulePtr
#endif
    ) {
	dyldLoadHandle = ckalloc(sizeof(Tcl_DyldLoadHandle));
#if TCL_DYLD_USE_DLFCN
	dyldLoadHandle->dlHandle = dlHandle;
#endif
#if TCL_DYLD_USE_NSMODULE || defined(TCL_LOAD_FROM_MEMORY)
	dyldLoadHandle->dyldLibHeader = dyldLibHeader;
	dyldLoadHandle->modulePtr = modulePtr;
#endif
	newHandle = ckalloc(sizeof(*newHandle));
	newHandle->clientData = dyldLoadHandle;
	newHandle->findSymbolProcPtr = &FindSymbol;
	newHandle->unloadFileProcPtr = &UnloadFile;
	*unloadProcPtr = &UnloadFile;
	*loadHandle = newHandle;
	result = TCL_OK;
    } else {

	Tcl_AppendResult(interp, errMsg, NULL);



#if TCL_DYLD_USE_NSMODULE
	if (objFileImageErrMsg) {

	    Tcl_AppendResult(interp, "\nNSCreateObjectFileImageFromFile() "
		    "error: ", objFileImageErrMsg, NULL);
	}
#endif

	result = TCL_ERROR;
    }
    if(fileName) {
	Tcl_DStringFree(&ds);
    }
    return result;
}

/*
 *----------------------------------------------------------------------
 *
 * FindSymbol --








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    Tcl_FSUnloadFileProc **unloadProcPtr)
				/* Filled with address of Tcl_FSUnloadFileProc
				 * function which should be used for this
				 * file. */
{
    Tcl_DyldLoadHandle *dyldLoadHandle;
    Tcl_LoadHandle newHandle;

    void *dlHandle = NULL;

#if TCL_DYLD_USE_NSMODULE || defined(TCL_LOAD_FROM_MEMORY)
    const struct mach_header *dyldLibHeader = NULL;
    Tcl_DyldModuleHandle *modulePtr = NULL;
#endif
#if TCL_DYLD_USE_NSMODULE
    NSLinkEditErrors editError;
    int errorNumber;
    const char *errorName, *objFileImageErrMsg = NULL;
#endif /* TCL_DYLD_USE_NSMODULE */
    const char *errMsg = NULL;
    int result;
    Tcl_DString ds;

    const char *nativePath, *nativeFileName = NULL;

    /*
     * 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.
     */

    nativePath = Tcl_FSGetNativePath(pathPtr);
    nativeFileName = Tcl_UtfToExternalDString(NULL, Tcl_GetString(pathPtr),
	    -1, &ds);

#if TCL_DYLD_USE_DLFCN




    /*
     * Use (RTLD_NOW|RTLD_LOCAL) always, see [Bug #3216070]
     */

    dlHandle = dlopen(nativePath, RTLD_NOW | RTLD_LOCAL);
    if (!dlHandle) {
	/*
	 * 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.

	 *



	 * Use (RTLD_NOW|RTLD_LOCAL) always, see [Bug #3216070]
	 */


	dlHandle = dlopen(nativeFileName, RTLD_NOW | RTLD_LOCAL);
	if (!dlHandle) {


	    errMsg = dlerror();

	}
    }

#endif /* TCL_DYLD_USE_DLFCN */

    if (!dlHandle) {
#if TCL_DYLD_USE_NSMODULE
	dyldLibHeader = NSAddImage(nativePath,
		NSADDIMAGE_OPTION_RETURN_ON_ERROR);
	if (!dyldLibHeader) {


	    NSLinkEditError(&editError, &errorNumber, &errorName, &errMsg);
	    if (editError == NSLinkEditFileAccessError) {
		/*
		 * The requested file was not found. 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.
		 */






		dyldLibHeader = NSAddImage(nativeFileName,
			NSADDIMAGE_OPTION_WITH_SEARCHING |
			NSADDIMAGE_OPTION_RETURN_ON_ERROR);
		if (!dyldLibHeader) {


		    NSLinkEditError(&editError, &errorNumber, &errorName,
			    &errMsg);

		}
	    } else if ((editError == NSLinkEditFileFormatError
		    && errorNumber == EBADMACHO)
		    || editError == NSLinkEditOtherError){
		NSObjectFileImageReturnCode err;
		NSObjectFileImage dyldObjFileImage;
		NSModule module;

		/*
		 * The requested file was found but was not of type MH_DYLIB,
		 * attempt to load it as a MH_BUNDLE.
		 */

		err = NSCreateObjectFileImageFromFile(nativePath,
			&dyldObjFileImage);
		if (err == NSObjectFileImageSuccess && dyldObjFileImage) {


		    module = NSLinkModule(dyldObjFileImage, nativePath,
			    NSLINKMODULE_OPTION_BINDNOW
			    | NSLINKMODULE_OPTION_RETURN_ON_ERROR);
		    NSDestroyObjectFileImage(dyldObjFileImage);
		    if (module) {
			modulePtr = ckalloc(sizeof(Tcl_DyldModuleHandle));
			modulePtr->module = module;
			modulePtr->nextPtr = NULL;

		    } else {
			NSLinkEditError(&editError, &errorNumber, &errorName,
				&errMsg);

		    }
		} else {
		    objFileImageErrMsg = DyldOFIErrorMsg(err);


		}
	    }
	}
#endif /* TCL_DYLD_USE_NSMODULE */
    }


    if (dlHandle

#if TCL_DYLD_USE_NSMODULE
	    || dyldLibHeader || modulePtr
#endif /* TCL_DYLD_USE_NSMODULE */
    ) {
	dyldLoadHandle = ckalloc(sizeof(Tcl_DyldLoadHandle));

	dyldLoadHandle->dlHandle = dlHandle;

#if TCL_DYLD_USE_NSMODULE || defined(TCL_LOAD_FROM_MEMORY)
	dyldLoadHandle->dyldLibHeader = dyldLibHeader;
	dyldLoadHandle->modulePtr = modulePtr;
#endif /* TCL_DYLD_USE_NSMODULE || TCL_LOAD_FROM_MEMORY */
	newHandle = ckalloc(sizeof(*newHandle));
	newHandle->clientData = dyldLoadHandle;
	newHandle->findSymbolProcPtr = &FindSymbol;
	newHandle->unloadFileProcPtr = &UnloadFile;
	*unloadProcPtr = &UnloadFile;
	*loadHandle = newHandle;
	result = TCL_OK;
    } else {
	Tcl_Obj *errObj = Tcl_NewObj();

	if (errMsg != NULL) {
	    Tcl_AppendToObj(errObj, errMsg, -1);
	}
#if TCL_DYLD_USE_NSMODULE
	if (objFileImageErrMsg) {
	    Tcl_AppendPrintfToObj(errObj,
		    "\nNSCreateObjectFileImageFromFile() error: %s",
		    objFileImageErrMsg);
	}
#endif /* TCL_DYLD_USE_NSMODULE */
	Tcl_SetObjResult(interp, errObj);
	result = TCL_ERROR;
    }

    Tcl_DStringFree(&ds);

    return result;
}

/*
 *----------------------------------------------------------------------
 *
 * FindSymbol --
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    Tcl_DyldLoadHandle *dyldLoadHandle = loadHandle->clientData;
    Tcl_PackageInitProc *proc = NULL;
    const char *errMsg = NULL;
    Tcl_DString ds;
    const char *native;

    native = Tcl_UtfToExternalDString(NULL, symbol, -1, &ds);
#if TCL_DYLD_USE_DLFCN
    if (dyldLoadHandle->dlHandle) {

	proc = dlsym(dyldLoadHandle->dlHandle, native);
	if (proc) {
	    TclLoadDbgMsg("dlsym() successful");
	} else {
	    errMsg = dlerror();
	    TclLoadDbgMsg("dlsym() failed: %s", errMsg);
	}
    } else
#endif /* TCL_DYLD_USE_DLFCN */
    {

#if TCL_DYLD_USE_NSMODULE || defined(TCL_LOAD_FROM_MEMORY)
	NSSymbol nsSymbol = NULL;
	Tcl_DString newName;

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

	Tcl_DStringInit(&newName);
	TclDStringAppendLiteral(&newName, "_");
	native = Tcl_DStringAppend(&newName, native, -1);
	if (dyldLoadHandle->dyldLibHeader) {
	    nsSymbol = NSLookupSymbolInImage(dyldLoadHandle->dyldLibHeader,
		    native, NSLOOKUPSYMBOLINIMAGE_OPTION_BIND_NOW |
		    NSLOOKUPSYMBOLINIMAGE_OPTION_RETURN_ON_ERROR);
	    if (nsSymbol) {
		TclLoadDbgMsg("NSLookupSymbolInImage() successful");
#ifdef DYLD_SUPPORTS_DYLIB_UNLOADING
		/*
		 * Until dyld supports unloading of MY_DYLIB binaries, the
		 * following is not needed.
		 */


		NSModule module = NSModuleForSymbol(nsSymbol);
		Tcl_DyldModuleHandle *modulePtr = dyldLoadHandle->modulePtr;

		while (modulePtr != NULL) {
		    if (module == modulePtr->module) {
			break;
		    }








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    Tcl_DyldLoadHandle *dyldLoadHandle = loadHandle->clientData;
    Tcl_PackageInitProc *proc = NULL;
    const char *errMsg = NULL;
    Tcl_DString ds;
    const char *native;

    native = Tcl_UtfToExternalDString(NULL, symbol, -1, &ds);

    if (dyldLoadHandle->dlHandle) {
#if TCL_DYLD_USE_DLFCN
	proc = dlsym(dyldLoadHandle->dlHandle, native);
	if (!proc) {


	    errMsg = dlerror();

	}

#endif /* TCL_DYLD_USE_DLFCN */

    } else {
#if TCL_DYLD_USE_NSMODULE || defined(TCL_LOAD_FROM_MEMORY)
	NSSymbol nsSymbol = NULL;
	Tcl_DString newName;

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

	Tcl_DStringInit(&newName);
	TclDStringAppendLiteral(&newName, "_");
	native = Tcl_DStringAppend(&newName, native, -1);
	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 *modulePtr = dyldLoadHandle->modulePtr;

		while (modulePtr != NULL) {
		    if (module == modulePtr->module) {
			break;
		    }
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#endif /* DYLD_SUPPORTS_DYLIB_UNLOADING */
	    } else {
		NSLinkEditErrors editError;
		int errorNumber;
		const char *errorName;

		NSLinkEditError(&editError, &errorNumber, &errorName, &errMsg);
		TclLoadDbgMsg("NSLookupSymbolInImage() failed: %s", errMsg);
	    }
	} else if (dyldLoadHandle->modulePtr) {
	    nsSymbol = NSLookupSymbolInModule(
		    dyldLoadHandle->modulePtr->module, native);
	    if (nsSymbol) {
		TclLoadDbgMsg("NSLookupSymbolInModule() successful");
	    } else {
		TclLoadDbgMsg("NSLookupSymbolInModule() failed");
	    }
	}
	if (nsSymbol) {
	    proc = NSAddressOfSymbol(nsSymbol);
	    if (proc) {
		TclLoadDbgMsg("NSAddressOfSymbol() successful");
	    } else {
		TclLoadDbgMsg("NSAddressOfSymbol() failed");
	    }
	}
	Tcl_DStringFree(&newName);
#endif /* TCL_DYLD_USE_NSMODULE */
    }
    Tcl_DStringFree(&ds);
    if (errMsg && (interp != NULL)) {
	Tcl_AppendResult(interp, "cannot find symbol \"", symbol, "\": ",
		errMsg, NULL);
	Tcl_SetErrorCode(interp, "TCL", "LOOKUP", "LOAD_SYMBOL", symbol,
		NULL);
    }
    return proc;
}

/*








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#endif /* DYLD_SUPPORTS_DYLIB_UNLOADING */
	    } else {
		NSLinkEditErrors editError;
		int errorNumber;
		const char *errorName;

		NSLinkEditError(&editError, &errorNumber, &errorName, &errMsg);

	    }
	} else if (dyldLoadHandle->modulePtr) {
	    nsSymbol = NSLookupSymbolInModule(
		    dyldLoadHandle->modulePtr->module, native);





	}
	if (nsSymbol) {
	    proc = NSAddressOfSymbol(nsSymbol);





	}
	Tcl_DStringFree(&newName);
#endif /* TCL_DYLD_USE_NSMODULE */
    }
    Tcl_DStringFree(&ds);
    if (errMsg && (interp != NULL)) {
	Tcl_SetObjResult(interp, Tcl_ObjPrintf(
		"cannot find symbol \"%s\": %s", symbol, errMsg));
	Tcl_SetErrorCode(interp, "TCL", "LOOKUP", "LOAD_SYMBOL", symbol,
		NULL);
    }
    return proc;
}

/*
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UnloadFile(
    Tcl_LoadHandle loadHandle)	/* loadHandle returned by a previous call to
				 * TclpDlopen(). The loadHandle is a token
				 * that represents the loaded file. */
{
    Tcl_DyldLoadHandle *dyldLoadHandle = loadHandle->clientData;

#if TCL_DYLD_USE_DLFCN
    if (dyldLoadHandle->dlHandle) {
	int result;

	result = dlclose(dyldLoadHandle->dlHandle);
	if (!result) {
	    TclLoadDbgMsg("dlclose() successful");
	} else {
	    TclLoadDbgMsg("dlclose() failed: %s", dlerror());
	}
    } else
#endif /* TCL_DYLD_USE_DLFCN */
    {
#if TCL_DYLD_USE_NSMODULE || defined(TCL_LOAD_FROM_MEMORY)
	Tcl_DyldModuleHandle *modulePtr = dyldLoadHandle->modulePtr;

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

	    result = NSUnLinkModule(modulePtr->module,
		    NSUNLINKMODULE_OPTION_RESET_LAZY_REFERENCES);
	    if (result) {
		TclLoadDbgMsg("NSUnLinkModule() successful");
	    } else {
		TclLoadDbgMsg("NSUnLinkModule() failed");
	    }
	    ptr = modulePtr;
	    modulePtr = modulePtr->nextPtr;
	    ckfree(ptr);
	}
#endif /* TCL_DYLD_USE_NSMODULE */
    }
    ckfree(dyldLoadHandle);
    ckfree(loadHandle);








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UnloadFile(
    Tcl_LoadHandle loadHandle)	/* loadHandle returned by a previous call to
				 * TclpDlopen(). The loadHandle is a token
				 * that represents the loaded file. */
{
    Tcl_DyldLoadHandle *dyldLoadHandle = loadHandle->clientData;


    if (dyldLoadHandle->dlHandle) {

#if TCL_DYLD_USE_DLFCN
	(void) dlclose(dyldLoadHandle->dlHandle);
#endif /* TCL_DYLD_USE_DLFCN */

    } else {





#if TCL_DYLD_USE_NSMODULE || defined(TCL_LOAD_FROM_MEMORY)
	Tcl_DyldModuleHandle *modulePtr = dyldLoadHandle->modulePtr;

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


	    (void) NSUnLinkModule(modulePtr->module,
		    NSUNLINKMODULE_OPTION_RESET_LAZY_REFERENCES);






	    modulePtr = modulePtr->nextPtr;
	    ckfree(ptr);
	}
#endif /* TCL_DYLD_USE_NSMODULE */
    }
    ckfree(dyldLoadHandle);
    ckfree(loadHandle);
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				 * 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.
 *
 * Side effects:
 *	Buffer is allocated.
 *
 *----------------------------------------------------------------------
 */


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









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				 * translated to local form if needed). */
    Tcl_DString *bufPtr)	/* Initialized empty dstring. Append package
				 * name to this if possible. */
{
    return 0;
}


/*
 *----------------------------------------------------------------------
 *
 * TclpLoadMemoryGetBuffer --
 *
 *	Allocate a buffer that can be used with TclpLoadMemory() below.
 *
 * Results:
 *	Pointer to allocated buffer or NULL if an error occurs.
 *
 * Side effects:
 *	Buffer is allocated.
 *
 *----------------------------------------------------------------------
 */

#ifdef TCL_LOAD_FROM_MEMORY
MODULE_SCOPE void *
TclpLoadMemoryGetBuffer(
    Tcl_Interp *interp,		/* Used for error reporting. */
    int size)			/* Size of desired buffer. */
{
    void *buffer = NULL;
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	if (vm_allocate(mach_task_self(), (vm_address_t *) &buffer, size, 1)) {
	    buffer = NULL;
	}
    }
    return buffer;
}


/*
 *----------------------------------------------------------------------
 *
 * TclpLoadMemory --
 *
 *	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.
 *
 * Side effects:
 *	New code is loaded from memory.
 *
 *----------------------------------------------------------------------
 */


MODULE_SCOPE int
TclpLoadMemory(
    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








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	if (vm_allocate(mach_task_self(), (vm_address_t *) &buffer, size, 1)) {
	    buffer = NULL;
	}
    }
    return buffer;
}
#endif /* TCL_LOAD_FROM_MEMORY */

/*
 *----------------------------------------------------------------------
 *
 * TclpLoadMemory --
 *
 *	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.
 *
 * Side effects:
 *	New code is loaded from memory.
 *
 *----------------------------------------------------------------------
 */

#ifdef TCL_LOAD_FROM_MEMORY
MODULE_SCOPE int
TclpLoadMemory(
    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
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#	define mh_magic MH_MAGIC
#	define arch_abi 0
#else
	const struct mach_header_64 *mh = NULL;
#	define mh_size  sizeof(struct mach_header_64)
#	define mh_magic MH_MAGIC_64
#	define arch_abi CPU_ARCH_ABI64
#endif

	if ((size_t) codeSize >= sizeof(struct fat_header)
		&& fh->magic == OSSwapHostToBigInt32(FAT_MAGIC)) {
	    uint32_t fh_nfat_arch = OSSwapBigToHostInt32(fh->nfat_arch);

	    /*
	     * Fat binary, try to find mach_header for our architecture
	     */

	    TclLoadDbgMsg("Fat binary, %d archs", fh_nfat_arch);
	    if ((size_t) codeSize >= sizeof(struct fat_header) +
		    fh_nfat_arch * sizeof(struct fat_arch)) {
		void *fatarchs = (char*)buffer + sizeof(struct fat_header);
		const NXArchInfo *arch = NXGetLocalArchInfo();
		struct fat_arch *fa;

		if (fh->magic != FAT_MAGIC) {
		    swap_fat_arch(fatarchs, fh_nfat_arch, arch->byteorder);
		}
		fa = NXFindBestFatArch(arch->cputype | arch_abi,
			arch->cpusubtype, fatarchs, fh_nfat_arch);
		if (fa) {
		    TclLoadDbgMsg("NXFindBestFatArch() successful: "
			    "local cputype %d subtype %d, "
			    "fat cputype %d subtype %d",
			    arch->cputype | arch_abi, arch->cpusubtype,
			    fa->cputype, fa->cpusubtype);
		    mh = (void*)((char*)buffer + fa->offset);
		    ms = fa->size;
		} else {
		    TclLoadDbgMsg("NXFindBestFatArch() failed");
		    err = NSObjectFileImageInappropriateFile;
		}
		if (fh->magic != FAT_MAGIC) {
		    swap_fat_arch(fatarchs, fh_nfat_arch, arch->byteorder);
		}
	    } else {
		TclLoadDbgMsg("Fat binary header failure");
		err = NSObjectFileImageInappropriateFile;
	    }
	} else {
	    /*
	     * Thin binary
	     */

	    TclLoadDbgMsg("Thin binary");
	    mh = buffer;
	    ms = codeSize;
	}
	if (ms && !(ms >= mh_size && mh->magic == mh_magic &&
		 mh->filetype == MH_BUNDLE)) {
	    TclLoadDbgMsg("Inappropriate file: magic %x filetype %d",
		    mh->magic, mh->filetype);
	    err = NSObjectFileImageInappropriateFile;
	}
	if (err == NSObjectFileImageSuccess) {
	    err = NSCreateObjectFileImageFromMemory(buffer, codeSize,
		    &dyldObjFileImage);
	    if (err == NSObjectFileImageSuccess) {
		TclLoadDbgMsg("NSCreateObjectFileImageFromMemory() "
			"successful");
	    } else {
		objFileImageErrMsg = DyldOFIErrorMsg(err);
		TclLoadDbgMsg("NSCreateObjectFileImageFromMemory() failed: %s",
			objFileImageErrMsg);
	    }
	} else {
	    objFileImageErrMsg = DyldOFIErrorMsg(err);
	}
    }

    /*
     * 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, "NSCreateObjectFileImageFromMemory() "
		    "error: ", objFileImageErrMsg, NULL);
	}
	return TCL_ERROR;
    }

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

    module = NSLinkModule(dyldObjFileImage, "[Memory Based Bundle]",
	    NSLINKMODULE_OPTION_BINDNOW | NSLINKMODULE_OPTION_RETURN_ON_ERROR);
    NSDestroyObjectFileImage(dyldObjFileImage);
    if (module) {
	TclLoadDbgMsg("NSLinkModule() successful");
    } else {
	NSLinkEditErrors editError;
	int errorNumber;
	const char *errorName, *errMsg;

	NSLinkEditError(&editError, &errorNumber, &errorName, &errMsg);
	TclLoadDbgMsg("NSLinkModule() failed: %s", errMsg);
	Tcl_AppendResult(interp, errMsg, NULL);
	return TCL_ERROR;
    }

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

    modulePtr = ckalloc(sizeof(Tcl_DyldModuleHandle));
    modulePtr->module = module;
    modulePtr->nextPtr = NULL;
    dyldLoadHandle = ckalloc(sizeof(Tcl_DyldLoadHandle));
#if TCL_DYLD_USE_DLFCN
    dyldLoadHandle->dlHandle = NULL;
#endif
    dyldLoadHandle->dyldLibHeader = NULL;
    dyldLoadHandle->modulePtr = modulePtr;
    newHandle = ckalloc(sizeof(*newHandle));
    newHandle->clientData = dyldLoadHandle;
    newHandle->findSymbolProcPtr = &FindSymbol;
    newHandle->unloadFileProcPtr = &UnloadFile;
    *loadHandle = newHandle;








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#	define mh_magic MH_MAGIC
#	define arch_abi 0
#else
	const struct mach_header_64 *mh = NULL;
#	define mh_size  sizeof(struct mach_header_64)
#	define mh_magic MH_MAGIC_64
#	define arch_abi CPU_ARCH_ABI64
#endif /*  __LP64__ */

	if ((size_t) codeSize >= sizeof(struct fat_header)
		&& fh->magic == OSSwapHostToBigInt32(FAT_MAGIC)) {
	    uint32_t fh_nfat_arch = OSSwapBigToHostInt32(fh->nfat_arch);

	    /*
	     * Fat binary, try to find mach_header for our architecture
	     */


	    if ((size_t) codeSize >= sizeof(struct fat_header) +
		    fh_nfat_arch * sizeof(struct fat_arch)) {
		void *fatarchs = (char*)buffer + sizeof(struct fat_header);
		const NXArchInfo *arch = NXGetLocalArchInfo();
		struct fat_arch *fa;

		if (fh->magic != FAT_MAGIC) {
		    swap_fat_arch(fatarchs, fh_nfat_arch, arch->byteorder);
		}
		fa = NXFindBestFatArch(arch->cputype | arch_abi,
			arch->cpusubtype, fatarchs, fh_nfat_arch);
		if (fa) {





		    mh = (void *)((char *) buffer + fa->offset);
		    ms = fa->size;
		} else {

		    err = NSObjectFileImageInappropriateFile;
		}
		if (fh->magic != FAT_MAGIC) {
		    swap_fat_arch(fatarchs, fh_nfat_arch, arch->byteorder);
		}
	    } else {

		err = NSObjectFileImageInappropriateFile;
	    }
	} else {
	    /*
	     * Thin binary
	     */


	    mh = buffer;
	    ms = codeSize;
	}
	if (ms && !(ms >= mh_size && mh->magic == mh_magic &&
		 mh->filetype == MH_BUNDLE)) {


	    err = NSObjectFileImageInappropriateFile;
	}
	if (err == NSObjectFileImageSuccess) {
	    err = NSCreateObjectFileImageFromMemory(buffer, codeSize,
		    &dyldObjFileImage);
	    if (err != NSObjectFileImageSuccess) {



		objFileImageErrMsg = DyldOFIErrorMsg(err);


	    }
	} else {
	    objFileImageErrMsg = DyldOFIErrorMsg(err);
	}
    }

    /*
     * 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_SetObjResult(interp, Tcl_ObjPrintf(
		    "NSCreateObjectFileImageFromMemory() error: ",
		    objFileImageErrMsg));
	}
	return TCL_ERROR;
    }

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

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


	NSLinkEditErrors editError;
	int errorNumber;
	const char *errorName, *errMsg;

	NSLinkEditError(&editError, &errorNumber, &errorName, &errMsg);

	Tcl_SetObjResult(interp, Tcl_NewStringObj(errMsg, -1));
	return TCL_ERROR;
    }

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

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

    dyldLoadHandle->dlHandle = NULL;

    dyldLoadHandle->dyldLibHeader = NULL;
    dyldLoadHandle->modulePtr = modulePtr;
    newHandle = ckalloc(sizeof(*newHandle));
    newHandle->clientData = dyldLoadHandle;
    newHandle->findSymbolProcPtr = &FindSymbol;
    newHandle->unloadFileProcPtr = &UnloadFile;
    *loadHandle = newHandle;
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