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tclLoadDyld.c

/*
 * tclLoadDyld.c --
 *
 *    This procedure provides a version of the TclLoadFile that works with
 *    Apple's dyld dynamic loading.
 *    Original version of his file (superseded long ago) provided by
 *    Wilfredo Sanchez (wsanchez@apple.com).
 *
 * Copyright (c) 1995 Apple Computer, Inc.
 * Copyright (c) 2001-2007 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.
 *
 * RCS: @(#) $Id: tclLoadDyld.c,v 1.29 2007/12/13 15:28:42 dgp Exp $
 */

#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

#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;
    case NSObjectFileImageFailure:
      return "object file setup failure";
    case NSObjectFileImageInappropriateFile:
      return "not a Mach-O MH_BUNDLE file";
    case NSObjectFileImageArch:
      return "no object for this architecture";
    case NSObjectFileImageFormat:
      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
 *    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 suddenly appears in memory.
 *
 *----------------------------------------------------------------------
 */

MODULE_SCOPE int
TclpDlopen(
    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
                         * (*unloadProcPtr)() to unload the file. */
    Tcl_FSUnloadFileProc **unloadProcPtr)
                        /* Filled with address of Tcl_FSUnloadFileProc
                         * function which should be used for this
                         * file. */
{
    Tcl_DyldLoadHandle *dyldLoadHandle;
#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
    {
      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);
          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 = (Tcl_DyldModuleHandle *)
                        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 = (Tcl_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
      *loadHandle = (Tcl_LoadHandle) dyldLoadHandle;
      *unloadProcPtr = &TclpUnloadFile;
      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;
}

/*
 *----------------------------------------------------------------------
 *
 * TclpFindSymbol --
 *
 *    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.
 *
 *----------------------------------------------------------------------
 */

MODULE_SCOPE Tcl_PackageInitProc *
TclpFindSymbol(
    Tcl_Interp *interp,       /* For error reporting. */
    Tcl_LoadHandle loadHandle,      /* Handle from TclpDlopen. */
    CONST char *symbol)       /* Symbol name to look up. */
{
    Tcl_DyldLoadHandle *dyldLoadHandle = (Tcl_DyldLoadHandle *) loadHandle;
    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);
      Tcl_DStringAppend(&newName, "_", 1);
      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;
                }
                modulePtr = modulePtr->nextPtr;
            }
            if (modulePtr == NULL) {
                modulePtr = (Tcl_DyldModuleHandle *)
                      ckalloc(sizeof(Tcl_DyldModuleHandle));
                modulePtr->module = module;
                modulePtr->nextPtr = dyldLoadHandle->modulePtr;
                dyldLoadHandle->modulePtr = modulePtr;
            }
#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) {
      Tcl_AppendResult(interp, errMsg, NULL);
    }
    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.
 *
 * Results:
 *    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.
 *
 *----------------------------------------------------------------------
 */

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

#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((char*) dyldLoadHandle);
}

/*
 *----------------------------------------------------------------------
 *
 * TclGuessPackageName --
 *
 *    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.
 *
 * Side effects:
 *    None.
 *
 *----------------------------------------------------------------------
 */

int
TclGuessPackageName(
    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.
 *
 * 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;

    /*
     * NSCreateObjectFileImageFromMemory is available but always fails
     * prior to Darwin 7.
     */
    if (tclMacOSXDarwinRelease >= 7) {
      /*
       * 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)) {
          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
                         * 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
                         * (*unloadProcPtr)() to unload the file. */
    Tcl_FSUnloadFileProc **unloadProcPtr)
                        /* Filled with address of Tcl_FSUnloadFileProc
                         * function which should be used for this
                         * file. */
{
    Tcl_DyldLoadHandle *dyldLoadHandle;
    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 = NSObjectFileImageSuccess;
      const struct fat_header *fh = buffer;
      uint32_t ms = 0;
#ifndef __LP64__
      const struct mach_header *mh = NULL;
      #define mh_size  sizeof(struct mach_header)
      #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 = (Tcl_DyldModuleHandle *) ckalloc(sizeof(Tcl_DyldModuleHandle));
    modulePtr->module = module;
    modulePtr->nextPtr = NULL;
    dyldLoadHandle = (Tcl_DyldLoadHandle *)
          ckalloc(sizeof(Tcl_DyldLoadHandle));
#if TCL_DYLD_USE_DLFCN
    dyldLoadHandle->dlHandle = NULL;
#endif
    dyldLoadHandle->dyldLibHeader = NULL;
    dyldLoadHandle->modulePtr = modulePtr;
    *loadHandle = (Tcl_LoadHandle) dyldLoadHandle;
    *unloadProcPtr = &TclpUnloadFile;
    return TCL_OK;
}
#endif /* TCL_LOAD_FROM_MEMORY */

/*
 * Local Variables:
 * mode: c
 * c-basic-offset: 4
 * fill-column: 79
 * End:
 */

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