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/*
* tclLoadDyld.c --
*
* This procedure provides a version of the TclLoadFile that
* works with NeXT/Apple's dyld dynamic loading. This file
* provided by Wilfredo Sanchez (wsanchez@apple.com).
* The works on Mac OS X and Mac OS X Server.
* It should work with OpenStep, but it's not been tried.
*
* 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: @(#) $Id$
*/
#include "tclInt.h"
#include <mach-o/dyld.h>
/*
*----------------------------------------------------------------------
*
* TclpLoadFile --
*
* Dynamically loads a binary code file into memory and returns
* the addresses of two procedures within that file, if they
* are defined.
*
* Results:
* A standard Tcl completion code. If an error occurs, an error
* message is left in the interpreter's result. *proc1Ptr and *proc2Ptr
* are filled in with the addresses of the symbols given by
* *sym1 and *sym2, or NULL if those symbols can't be found.
*
* Side effects:
* New code suddenly appears in memory.
*
*----------------------------------------------------------------------
*/
int
TclpLoadFile(interp, fileName, sym1, sym2, proc1Ptr, proc2Ptr, clientDataPtr)
Tcl_Interp *interp; /* Used for error reporting. */
char *fileName; /* Name of the file containing the desired
* code. */
char *sym1, *sym2; /* Names of two procedures to look up in
* the file's symbol table. */
Tcl_PackageInitProc **proc1Ptr, **proc2Ptr;
/* Where to return the addresses corresponding
* to sym1 and sym2. */
ClientData *clientDataPtr; /* Filled with token for dynamically loaded
* file which will be passed back to
* TclpUnloadFile() to unload the file. */
{
NSObjectFileImageReturnCode err;
NSObjectFileImage image;
NSModule module;
NSSymbol symbol;
char *name;
err = NSCreateObjectFileImageFromFile(fileName, &image);
if (err != NSObjectFileImageSuccess) {
switch (err) {
case NSObjectFileImageFailure:
Tcl_SetResult(interp, "dyld: general failure", TCL_STATIC);
break;
case NSObjectFileImageInappropriateFile:
Tcl_SetResult(interp, "dyld: inappropriate Mach-O file",
TCL_STATIC);
break;
case NSObjectFileImageArch:
Tcl_SetResult(interp,
"dyld: inappropriate Mach-O architecture", TCL_STATIC);
break;
case NSObjectFileImageFormat:
Tcl_SetResult(interp, "dyld: invalid Mach-O file format",
TCL_STATIC);
break;
case NSObjectFileImageAccess:
Tcl_SetResult(interp, "dyld: permission denied", TCL_STATIC);
break;
default:
Tcl_SetResult(interp, "dyld: unknown failure", TCL_STATIC);
break;
}
return TCL_ERROR;
}
module = NSLinkModule(image, fileName, TRUE);
if (module == NULL) {
Tcl_SetResult(interp, "dyld: falied to link module", TCL_STATIC);
return TCL_ERROR;
}
name = (char*)malloc(sizeof(char)*(strlen(sym1)+2));
sprintf(name, "_%s", sym1);
symbol = NSLookupAndBindSymbol(name);
free(name);
*proc1Ptr = NSAddressOfSymbol(symbol);
name = (char*)malloc(sizeof(char)*(strlen(sym2)+2));
sprintf(name, "_%s", sym2);
symbol = NSLookupAndBindSymbol(name);
free(name);
*proc2Ptr = NSAddressOfSymbol(symbol);
*clientDataPtr = module;
return TCL_OK;
}
/*
*----------------------------------------------------------------------
*
* 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 this is a no-op on older (OpenStep) versions of dyld.
*
*----------------------------------------------------------------------
*/
void
TclpUnloadFile(clientData)
ClientData clientData; /* ClientData returned by a previous call
* to TclpLoadFile(). The clientData is
* a token that represents the loaded
* file. */
{
NSUnLinkModule(clientData, FALSE);
}
/*
*----------------------------------------------------------------------
*
* 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(fileName, bufPtr)
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;
}
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