xpcom/glue/standalone/nsGlueLinkingOSX.cpp

   1 /* -*- Mode: C++; tab-width: 6; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
   2 /* ***** BEGIN LICENSE BLOCK *****
   3  * Version: MPL 1.1/GPL 2.0/LGPL 2.1
   4  *
   5  * The contents of this file are subject to the Mozilla Public License Version
   6  * 1.1 (the "License"); you may not use this file except in compliance with
   7  * the License. You may obtain a copy of the License at
   8  * http://www.mozilla.org/MPL/
   9  *
  10  * Software distributed under the License is distributed on an "AS IS" basis,
  11  * WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
  12  * for the specific language governing rights and limitations under the
  13  * License.
  14  *
  15  * The Original Code is Mozilla XPCOM.
  16  *
  17  * The Initial Developer of the Original Code is
  18  * Benjamin Smedberg <benjamin@smedbergs.us>
  19  *
  20  * Portions created by the Initial Developer are Copyright (C) 2005
  21  * the Initial Developer. All Rights Reserved.
  22  *
  23  * Contributor(s):
  24  *
  25  * Alternatively, the contents of this file may be used under the terms of
  26  * either the GNU General Public License Version 2 or later (the "GPL"), or
  27  * the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
  28  * in which case the provisions of the GPL or the LGPL are applicable instead
  29  * of those above. If you wish to allow use of your version of this file only
  30  * under the terms of either the GPL or the LGPL, and not to allow others to
  31  * use your version of this file under the terms of the MPL, indicate your
  32  * decision by deleting the provisions above and replace them with the notice
  33  * and other provisions required by the GPL or the LGPL. If you do not delete
  34  * the provisions above, a recipient may use your version of this file under
  35  * the terms of any one of the MPL, the GPL or the LGPL.
  36  *
  37  * ***** END LICENSE BLOCK ***** */
  38
  39 #include "nsGlueLinking.h"
  40 #include "nsXPCOMGlue.h"
  41
  42 #include <mach-o/dyld.h>
  43 #include <sys/param.h>
  44 #include <stdlib.h>
  45 #include <string.h>
  46 #include <stdio.h>
  47
  48 static const mach_header* sXULLibImage;
  49
  50 static void
  51 ReadDependentCB(const char *aDependentLib)
  52 {
  53     (void) NSAddImage(aDependentLib,
  54                       NSADDIMAGE_OPTION_RETURN_ON_ERROR |
  55                       NSADDIMAGE_OPTION_MATCH_FILENAME_BY_INSTALLNAME);
  56 }
  57
  58 static void*
  59 LookupSymbol(const mach_header* aLib, const char* aSymbolName)
  60 {
  61     // Try to use |NSLookupSymbolInImage| since it is faster than searching
  62     // the global symbol table.  If we couldn't get a mach_header pointer
  63     // for the XPCOM dylib, then use |NSLookupAndBindSymbol| to search the
  64     // global symbol table (this shouldn't normally happen, unless the user
  65     // has called XPCOMGlueStartup(".") and relies on libxpcom.dylib
  66     // already being loaded).
  67     NSSymbol sym = nsnull;
  68     if (aLib) {
  69         sym = NSLookupSymbolInImage(aLib, aSymbolName,
  70                                  NSLOOKUPSYMBOLINIMAGE_OPTION_BIND |
  71                                  NSLOOKUPSYMBOLINIMAGE_OPTION_RETURN_ON_ERROR);
  72     } else {
  73         if (NSIsSymbolNameDefined(aSymbolName))
  74             sym = NSLookupAndBindSymbol(aSymbolName);
  75     }
  76     if (!sym)
  77         return nsnull;
  78
  79     return NSAddressOfSymbol(sym);
  80 }
  81
  82 GetFrozenFunctionsFunc
  83 XPCOMGlueLoad(const char *xpcomFile)
  84 {
  85     const mach_header* lib = nsnull;
  86
  87     if (xpcomFile[0] != '.' || xpcomFile[1] != '\0') {
  88         char xpcomDir[PATH_MAX];
  89         if (realpath(xpcomFile, xpcomDir)) {
  90             char *lastSlash = strrchr(xpcomDir, '/');
  91             if (lastSlash) {
  92                 *lastSlash = '\0';
  93
  94                 XPCOMGlueLoadDependentLibs(xpcomDir, ReadDependentCB);
  95
  96                 snprintf(lastSlash, PATH_MAX - strlen(xpcomDir), "/" XUL_DLL);
  97
  98                 sXULLibImage = NSAddImage(xpcomDir,
  99                               NSADDIMAGE_OPTION_RETURN_ON_ERROR |
 100                               NSADDIMAGE_OPTION_WITH_SEARCHING |
 101                               NSADDIMAGE_OPTION_MATCH_FILENAME_BY_INSTALLNAME);
 102             }
 103         }
 104
 105         lib = NSAddImage(xpcomFile,
 106                          NSADDIMAGE_OPTION_RETURN_ON_ERROR |
 107                          NSADDIMAGE_OPTION_WITH_SEARCHING |
 108                          NSADDIMAGE_OPTION_MATCH_FILENAME_BY_INSTALLNAME);
 109     }
 110
 111     return (GetFrozenFunctionsFunc) LookupSymbol(lib, "_NS_GetFrozenFunctions");
 112 }
 113
 114 void
 115 XPCOMGlueUnload()
 116 {
 117   // nothing to do, since we cannot unload dylibs on OS X
 118 }
 119
 120 nsresult
 121 XPCOMGlueLoadXULFunctions(const nsDynamicFunctionLoad *symbols)
 122 {
 123     nsresult rv = NS_OK;
 124     while (symbols->functionName) {
 125         char buffer[512];
 126         snprintf(buffer, sizeof(buffer), "_%s", symbols->functionName);
 127
 128         *symbols->function = (NSFuncPtr) LookupSymbol(sXULLibImage, buffer);
 129         if (!*symbols->function)
 130             rv = NS_ERROR_LOSS_OF_SIGNIFICANT_DATA;
 131
 132         ++symbols;
 133     }
 134
 135     return rv;
 136 }