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/*
* 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 works on Mac OS X.
*
* Copyright (c) 1995 Apple Computer, Inc.
*
* 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 1.11 2002/07/18 16:26:04 vincentdarley Exp $
* RCS: @(#) $Id: tclLoadDyld.c,v 1.12 2002/07/24 13:51:18 das Exp $
*/
#include "tclInt.h"
#include "tclPort.h"
#include <mach-o/dyld.h>
typedef struct Tcl_DyldModuleHandle {
struct Tcl_DyldModuleHandle *nextModuleHandle;
NSModule module;
} Tcl_DyldModuleHandle;
typedef struct Tcl_DyldLoadHandle {
const struct mach_header *dyld_lib;
Tcl_DyldModuleHandle *firstModuleHandle;
} Tcl_DyldLoadHandle;
/*
*----------------------------------------------------------------------
*
* TclpDlopen --
*
* Dynamically loads a binary code file into memory and returns
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* 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;
const struct mach_header *dyld_lib;
char *native;
CONST char *native;
native = Tcl_FSGetNativePath(pathPtr);
dyld_lib = NSAddImage(native,
NSADDIMAGE_OPTION_WITH_SEARCHING |
NSADDIMAGE_OPTION_RETURN_ON_ERROR);
if (!dyld_lib) {
NSLinkEditErrors editError;
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 = NULL;
*loadHandle = (Tcl_LoadHandle)dyld_lib;
*loadHandle = (Tcl_LoadHandle) dyldLoadHandle;
*unloadProcPtr = &TclpUnloadFile;
return TCL_OK;
}
/*
*----------------------------------------------------------------------
*
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Tcl_LoadHandle loadHandle;
CONST char *symbol;
{
NSSymbol nsSymbol;
CONST char *native;
Tcl_DString newName, ds;
Tcl_PackageInitProc* proc = NULL;
const struct mach_header *dyld_lib = (mach_header *)loadHandle;
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);
nsSymbol = NSLookupSymbolInImage(dyld_lib, native,
nsSymbol = NSLookupSymbolInImage(dyldLoadHandle->dyld_lib, native,
NSLOOKUPSYMBOLINIMAGE_OPTION_BIND_NOW |
NSLOOKUPSYMBOLINIMAGE_OPTION_RETURN_ON_ERROR);
if(nsSymbol) {
Tcl_DyldModuleHandle *dyldModuleHandle;
proc = NSAddressOfSymbol(nsSymbol);
dyldModuleHandle = (Tcl_DyldModuleHandle *) ckalloc(sizeof(Tcl_DyldModuleHandle));
if (dyldModuleHandle) {
/* *clientDataPtr = NSModuleForSymbol(nsSymbol); */
dyldModuleHandle->module = NSModuleForSymbol(nsSymbol);
dyldModuleHandle->nextModuleHandle = dyldLoadHandle->firstModuleHandle;
dyldLoadHandle->firstModuleHandle = dyldModuleHandle;
}
}
Tcl_DStringFree(&newName);
Tcl_DStringFree(&ds);
return proc;
}
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void
TclpUnloadFile(loadHandle)
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;
Tcl_DyldModuleHandle *dyldModuleHandle = dyldLoadHandle->firstModuleHandle;
void *ptr;
NSUnLinkModule(loadHandle, FALSE);
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