gecko-dev/xpcom/glue/standalone/nsGlueLinkingOSX.cpp

/* -*- Mode: C++; tab-width: 6; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
/* ***** BEGIN LICENSE BLOCK *****
 * Version: MPL 1.1/GPL 2.0/LGPL 2.1
 *
 * The contents of this file are subject to the Mozilla Public License Version
 * 1.1 (the "License"); you may not use this file except in compliance with
 * the License. You may obtain a copy of the License at
 * http://www.mozilla.org/MPL/
 *
 * Software distributed under the License is distributed on an "AS IS" basis,
 * WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
 * for the specific language governing rights and limitations under the
 * License.
 *
 * The Original Code is Mozilla XPCOM.
 *
 * The Initial Developer of the Original Code is
 * Benjamin Smedberg <benjamin@smedbergs.us>
 *
 * Portions created by the Initial Developer are Copyright (C) 2005
 * the Initial Developer. All Rights Reserved.
 *
 * Contributor(s):
 *
 * Alternatively, the contents of this file may be used under the terms of
 * either the GNU General Public License Version 2 or later (the "GPL"), or
 * the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
 * in which case the provisions of the GPL or the LGPL are applicable instead
 * of those above. If you wish to allow use of your version of this file only
 * under the terms of either the GPL or the LGPL, and not to allow others to
 * use your version of this file under the terms of the MPL, indicate your
 * decision by deleting the provisions above and replace them with the notice
 * and other provisions required by the GPL or the LGPL. If you do not delete
 * the provisions above, a recipient may use your version of this file under
 * the terms of any one of the MPL, the GPL or the LGPL.
 *
 * ***** END LICENSE BLOCK ***** */

#include "nsGlueLinking.h"
#include "nsXPCOMGlue.h"

#include <mach-o/dyld.h>
#include <sys/param.h>
#include <stdlib.h>
#include <string.h>
#include <stdio.h>

static void
ReadDependentCB(const char *aDependentLib)
{
    (void) NSAddImage(aDependentLib,
                      NSADDIMAGE_OPTION_RETURN_ON_ERROR |
                      NSADDIMAGE_OPTION_MATCH_FILENAME_BY_INSTALLNAME);
}

GetFrozenFunctionsFunc
XPCOMGlueLoad(const char *xpcomFile)
{
    if (xpcomFile[0] != '.' || xpcomFile[1] != '\0') {
        char xpcomDir[PATH_MAX];
        if (realpath(xpcomFile, xpcomDir)) {
            char *lastSlash = strrchr(xpcomDir, '/');
            if (lastSlash) {
                *lastSlash = '\0';

                XPCOMGlueLoadDependentLibs(xpcomDir, ReadDependentCB);
            }
        }

        (void) NSAddImage(xpcomFile,
                          NSADDIMAGE_OPTION_RETURN_ON_ERROR |
                          NSADDIMAGE_OPTION_WITH_SEARCHING |
                          NSADDIMAGE_OPTION_MATCH_FILENAME_BY_INSTALLNAME);
        // We don't really care if this fails, as long as we can get
        // NS_GetFrozenFunctions below.
    }

    if (!NSIsSymbolNameDefined("_NS_GetFrozenFunctions"))
      return nsnull;

    NSSymbol sym = NSLookupAndBindSymbol("_NS_GetFrozenFunctions");
    return (GetFrozenFunctionsFunc) NSAddressOfSymbol(sym);
}

void
XPCOMGlueUnload()
{
  // nothing to do, since we cannot unload dylibs on OS X
}

nsresult
XPCOMGlueLoadXULFunctions(const nsDynamicFunctionLoad *symbols)
{
    nsresult rv = NS_OK;
    while (symbols->functionName) {
        char buffer[512];
        snprintf(buffer, sizeof(buffer), "_%s", symbols->functionName);

        if (!NSIsSymbolNameDefined(buffer)) {
            rv = NS_ERROR_LOSS_OF_SIGNIFICANT_DATA;
        }
        else {
            NSSymbol sym = NSLookupAndBindSymbol(buffer);
            *symbols->function = (NSFuncPtr) NSAddressOfSymbol(sym);
        }

        ++symbols;
    }

    return rv;
}