| 1 | /* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
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| 2 | /* ***** BEGIN LICENSE BLOCK *****
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| 3 | * Version: MPL 1.1/GPL 2.0/LGPL 2.1
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| 4 | *
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| 5 | * The contents of this file are subject to the Mozilla Public License Version
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| 6 | * 1.1 (the "License"); you may not use this file except in compliance with
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| 7 | * the License. You may obtain a copy of the License at
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| 8 | * http://www.mozilla.org/MPL/
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| 9 | *
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| 10 | * Software distributed under the License is distributed on an "AS IS" basis,
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| 11 | * WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
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| 12 | * for the specific language governing rights and limitations under the
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| 13 | * License.
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| 14 | *
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| 15 | * The Original Code is mozilla.org code.
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| 16 | *
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| 17 | * The Initial Developer of the Original Code is
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| 18 | * Netscape Communications Corporation.
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| 19 | * Portions created by the Initial Developer are Copyright (C) 1998
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| 20 | * the Initial Developer. All Rights Reserved.
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| 21 | *
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| 22 | * Contributor(s):
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| 23 | *
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| 24 | * Alternatively, the contents of this file may be used under the terms of
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| 25 | * either of the GNU General Public License Version 2 or later (the "GPL"),
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| 26 | * or the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
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| 27 | * in which case the provisions of the GPL or the LGPL are applicable instead
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| 28 | * of those above. If you wish to allow use of your version of this file only
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| 29 | * under the terms of either the GPL or the LGPL, and not to allow others to
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| 30 | * use your version of this file under the terms of the MPL, indicate your
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| 31 | * decision by deleting the provisions above and replace them with the notice
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| 32 | * and other provisions required by the GPL or the LGPL. If you do not delete
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| 33 | * the provisions above, a recipient may use your version of this file under
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| 34 | * the terms of any one of the MPL, the GPL or the LGPL.
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| 35 | *
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| 36 | * ***** END LICENSE BLOCK ***** */
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| 37 |
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| 38 | /* nsDll
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| 39 | *
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| 40 | * Abstraction of a Dll. Stores modifiedTime and size for easy detection of
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| 41 | * change in dll.
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| 42 | *
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| 43 | * dp Suresh <dp@netscape.com>
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| 44 | */
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| 45 |
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| 46 | #include "xcDll.h"
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| 47 | #include "nsDebug.h"
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| 48 | #include "nsIComponentManager.h"
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| 49 | #include "nsIComponentLoaderManager.h"
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| 50 | #include "nsIModule.h"
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| 51 | #include "nsILocalFile.h"
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| 52 | #include "nsDirectoryServiceDefs.h"
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| 53 | #include "nsDirectoryServiceUtils.h"
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| 54 | #include "nsCOMPtr.h"
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| 55 | #include "nsCRT.h"
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| 56 | #include "nsString.h"
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| 57 | #include "nsITimelineService.h"
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| 58 | #include "nsModule.h"
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| 59 | #ifdef DEBUG
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| 60 | #if defined(VMS)
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| 61 | #include <lib$routines.h>
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| 62 | #include <ssdef.h>
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| 63 | #elif defined(XP_MACOSX)
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| 64 | #include <signal.h>
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| 65 | #endif
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| 66 | #endif /* defined(DEBUG) */
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| 67 |
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| 68 | #include "nsTraceRefcntImpl.h"
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| 69 |
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| 70 | #define UNLOAD_DEPENDENT_LIBS
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| 71 | #ifdef HPUX
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| 72 | #undef UNLOAD_DEPENDENT_LIBS
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| 73 | #endif
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| 74 |
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| 75 | #include "nsNativeComponentLoader.h"
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| 76 |
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| 77 | nsDll::nsDll(nsIFile *dllSpec, nsNativeComponentLoader *loader)
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| 78 | : m_dllSpec(do_QueryInterface(dllSpec)),
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| 79 | m_instance(NULL),
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| 80 | m_moduleObject(NULL),
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| 81 | m_loader(loader),
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| 82 | m_markForUnload(PR_FALSE)
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| 83 | {
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| 84 | NS_ASSERTION(loader, "Null loader when creating a nsDLL");
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| 85 | }
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| 86 |
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| 87 | nsDll::~nsDll(void)
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| 88 | {
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| 89 | //#if DEBUG_dougt
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| 90 | // The dll gets deleted when the dllStore is destroyed. This happens on
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| 91 | // app shutdown. At that point, unloading dlls can cause crashes if we have
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| 92 | // - dll dependencies
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| 93 | // - callbacks
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| 94 | // - static dtors
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| 95 | // Hence turn it back on after all the above have been removed.
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| 96 | //Unload();
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| 97 | //#endif
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| 98 | }
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| 99 |
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| 100 | void
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| 101 | nsDll::GetDisplayPath(nsACString& aLeafName)
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| 102 | {
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| 103 | m_dllSpec->GetNativeLeafName(aLeafName);
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| 104 |
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| 105 | if (aLeafName.IsEmpty())
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| 106 | aLeafName.AssignLiteral("unknown!");
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| 107 | }
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| 108 |
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| 109 | PRBool
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| 110 | nsDll::HasChanged()
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| 111 | {
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| 112 | nsCOMPtr<nsIComponentLoaderManager> manager = do_QueryInterface(m_loader->mCompMgr);
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| 113 | if (!manager)
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| 114 | return PR_TRUE;
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| 115 |
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| 116 | // If mod date has changed, then dll has changed
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| 117 | PRInt64 currentDate;
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| 118 | nsresult rv = m_dllSpec->GetLastModifiedTime(¤tDate);
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| 119 | if (NS_FAILED(rv))
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| 120 | return PR_TRUE;
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| 121 | PRBool changed = PR_TRUE;
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| 122 | manager->HasFileChanged(m_dllSpec, nsnull, currentDate, &changed);
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| 123 | return changed;
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| 124 | }
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| 125 |
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| 126 | PRBool nsDll::Load(void)
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| 127 | {
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| 128 | if (m_instance != NULL)
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| 129 | {
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| 130 | // Already loaded
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| 131 | return (PR_TRUE);
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| 132 | }
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| 133 |
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| 134 | if (m_dllSpec)
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| 135 | {
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| 136 | #ifdef NS_BUILD_REFCNT_LOGGING
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| 137 | nsTraceRefcntImpl::SetActivityIsLegal(PR_FALSE);
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| 138 | #endif
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| 139 |
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| 140 | // Load any library dependencies
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| 141 | // The Component Loader Manager may hold onto some extra data
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| 142 | // set by either the native component loader or the native
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| 143 | // component. We assume that this data is a space delimited
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| 144 | // listing of dependent libraries which are required to be
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| 145 | // loaded prior to us loading the given component. Once, the
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| 146 | // component is loaded into memory, we can release our hold
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| 147 | // on the dependent libraries with the assumption that the
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| 148 | // component library holds a reference via the OS so loader.
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| 149 |
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| 150 | #if defined(XP_UNIX)
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| 151 | nsCOMPtr<nsIComponentLoaderManager> manager = do_QueryInterface(m_loader->mCompMgr);
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| 152 | if (!manager)
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| 153 | return PR_TRUE;
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| 154 |
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| 155 | nsXPIDLCString extraData;
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| 156 | manager->GetOptionalData(m_dllSpec, nsnull, getter_Copies(extraData));
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| 157 |
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| 158 | #ifdef UNLOAD_DEPENDENT_LIBS
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| 159 | nsVoidArray dependentLibArray;
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| 160 | #endif
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| 161 |
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| 162 | // if there was any extra data, treat it as a listing of dependent libs
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| 163 | if (extraData != nsnull)
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| 164 | {
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| 165 | // all dependent libraries are suppose to be in the "gre" directory.
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| 166 | // note that the gre directory is the same as the "bin" directory,
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| 167 | // when there isn't a real "gre" found.
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| 168 |
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| 169 | nsXPIDLCString path;
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| 170 | nsCOMPtr<nsIFile> file;
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| 171 | NS_GetSpecialDirectory(NS_GRE_DIR, getter_AddRefs(file));
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| 172 |
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| 173 | if (!file)
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| 174 | return NS_ERROR_FAILURE;
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| 175 |
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| 176 | // we are talking about a file in the GRE dir. Lets append something
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| 177 | // stupid right now, so that later we can just set the leaf name.
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| 178 | file->AppendNative(NS_LITERAL_CSTRING("dummy"));
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| 179 |
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| 180 | char *buffer = strdup(extraData);
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| 181 | if (!buffer)
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| 182 | return NS_ERROR_OUT_OF_MEMORY;
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| 183 |
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| 184 | char* newStr;
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| 185 | char *token = nsCRT::strtok(buffer, " ", &newStr);
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| 186 | while (token!=nsnull)
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| 187 | {
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| 188 | nsCStringKey key(token);
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| 189 | if (m_loader->mLoadedDependentLibs.Get(&key)) {
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| 190 | token = nsCRT::strtok(newStr, " ", &newStr);
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| 191 | continue;
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| 192 | }
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| 193 |
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| 194 | m_loader->mLoadedDependentLibs.Put(&key, (void*)1);
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| 195 |
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| 196 | nsXPIDLCString libpath;
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| 197 | file->SetNativeLeafName(nsDependentCString(token));
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| 198 | file->GetNativePath(path);
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| 199 | if (!path)
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| 200 | return NS_ERROR_FAILURE;
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| 201 |
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| 202 | // Load this dependent library with the global flag and stash
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| 203 | // the result for later so that we can unload it.
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| 204 | PRLibSpec libSpec;
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| 205 | libSpec.type = PR_LibSpec_Pathname;
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| 206 |
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| 207 | // if the depend library path starts with a / we are
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| 208 | // going to assume that it is a full path and should
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| 209 | // be loaded without prepending the gre diretory
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| 210 | // location. We could have short circuited the
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| 211 | // SetNativeLeafName above, but this is clearer and
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| 212 | // the common case is a relative path.
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| 213 |
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| 214 | if (token[0] == '/')
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| 215 | libSpec.value.pathname = token;
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| 216 | else
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| 217 | libSpec.value.pathname = path;
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| 218 |
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| 219 | PRLibrary* lib = PR_LoadLibraryWithFlags(libSpec, PR_LD_LAZY|PR_LD_GLOBAL);
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| 220 | // if we couldn't load the dependent library. We did the best we
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| 221 | // can. Now just let us fail later if this really was a required
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| 222 | // dependency.
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| 223 | #ifdef UNLOAD_DEPENDENT_LIBS
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| 224 | if (lib)
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| 225 | dependentLibArray.AppendElement((void*)lib);
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| 226 | #endif
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| 227 |
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| 228 | token = nsCRT::strtok(newStr, " ", &newStr);
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| 229 | }
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| 230 | free(buffer);
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| 231 | }
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| 232 | #endif
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| 233 |
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| 234 | // load the component
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| 235 | nsCOMPtr<nsILocalFile> lf(do_QueryInterface(m_dllSpec));
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| 236 | NS_ASSERTION(lf, "nsIFile here must implement a nsILocalFile");
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| 237 | lf->Load(&m_instance);
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| 238 |
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| 239 | #if defined(XP_UNIX)
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| 240 | // Unload any of library dependencies we loaded earlier. The assumption
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| 241 | // here is that the component will have a "internal" reference count to
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| 242 | // the dependency library we just loaded.
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| 243 | // XXX should we unload later - or even at all?
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| 244 |
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| 245 | #ifdef UNLOAD_DEPENDENT_LIBS
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| 246 | if (extraData != nsnull)
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| 247 | {
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| 248 | PRInt32 arrayCount = dependentLibArray.Count();
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| 249 | for (PRInt32 index = 0; index < arrayCount; index++)
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| 250 | PR_UnloadLibrary((PRLibrary*)dependentLibArray.ElementAt(index));
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| 251 | }
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| 252 | #endif
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| 253 | #endif
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| 254 |
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| 255 | #ifdef NS_BUILD_REFCNT_LOGGING
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| 256 | nsTraceRefcntImpl::SetActivityIsLegal(PR_TRUE);
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| 257 | if (m_instance) {
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| 258 | // Inform refcnt tracer of new library so that calls through the
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| 259 | // new library can be traced.
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| 260 | nsXPIDLCString displayPath;
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| 261 | GetDisplayPath(displayPath);
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| 262 | nsTraceRefcntImpl::LoadLibrarySymbols(displayPath.get(), m_instance);
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| 263 | }
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| 264 | #endif
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| 265 | }
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| 266 |
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| 267 | #ifdef SHOULD_IMPLEMENT_BREAKAFTERLOAD
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| 268 | // Debugging help for components. Component dlls need to have their
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| 269 | // symbols loaded before we can put a breakpoint in the debugger.
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| 270 | // This will help figureing out the point when the dll was loaded.
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| 271 | nsXPIDLCString displayPath;
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| 272 | GetDisplayPath(displayPath);
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| 273 | BreakAfterLoad(displayPath.get());
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| 274 | #endif
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| 275 |
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| 276 | return ((m_instance == NULL) ? PR_FALSE : PR_TRUE);
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| 277 | }
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| 278 |
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| 279 | PRBool nsDll::Unload(void)
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| 280 | {
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| 281 | if (m_instance == NULL)
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| 282 | return (PR_FALSE);
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| 283 |
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| 284 | // Shutdown the dll
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| 285 | Shutdown();
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| 286 |
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| 287 | #ifdef NS_BUILD_REFCNT_LOGGING
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| 288 | nsTraceRefcntImpl::SetActivityIsLegal(PR_FALSE);
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| 289 | #endif
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| 290 | PRStatus ret = PR_UnloadLibrary(m_instance);
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| 291 | #ifdef NS_BUILD_REFCNT_LOGGING
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| 292 | nsTraceRefcntImpl::SetActivityIsLegal(PR_TRUE);
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| 293 | #endif
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| 294 |
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| 295 | if (ret == PR_SUCCESS)
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| 296 | {
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| 297 | m_instance = NULL;
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| 298 | return (PR_TRUE);
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| 299 | }
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| 300 | else
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| 301 | return (PR_FALSE);
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| 302 | }
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| 303 |
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| 304 | void * nsDll::FindSymbol(const char *symbol)
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| 305 | {
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| 306 | if (symbol == NULL)
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| 307 | return (NULL);
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| 308 |
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| 309 | // If not already loaded, load it now.
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| 310 | if (Load() != PR_TRUE)
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| 311 | return (NULL);
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| 312 |
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| 313 | return(PR_FindSymbol(m_instance, symbol));
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| 314 | }
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| 315 |
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| 316 |
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| 317 | // Component dll specific functions
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| 318 | nsresult nsDll::GetDllSpec(nsIFile **fsobj)
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| 319 | {
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| 320 | NS_ASSERTION(m_dllSpec, "m_dllSpec NULL");
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| 321 | NS_ASSERTION(fsobj, "xcDll::GetModule : Null argument" );
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| 322 |
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| 323 | *fsobj = m_dllSpec;
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| 324 | NS_ADDREF(*fsobj);
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| 325 | return NS_OK;
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| 326 | }
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| 327 |
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| 328 | nsresult nsDll::GetModule(nsISupports *servMgr, nsIModule **cobj)
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| 329 | {
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| 330 | // using the backpointer of the loader.
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| 331 | nsIComponentManager* compMgr = m_loader->mCompMgr;
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| 332 | NS_ASSERTION(compMgr, "Global Component Manager is null" );
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| 333 | if (!compMgr) return NS_ERROR_UNEXPECTED;
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| 334 |
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| 335 | NS_ASSERTION(cobj, "xcDll::GetModule : Null argument" );
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| 336 |
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| 337 | if (m_moduleObject)
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| 338 | {
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| 339 | NS_ADDREF(m_moduleObject);
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| 340 | *cobj = m_moduleObject;
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| 341 | return NS_OK;
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| 342 | }
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| 343 |
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| 344 | // If not already loaded, load it now.
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| 345 | if (Load() != PR_TRUE) return NS_ERROR_FAILURE;
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| 346 |
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| 347 | // We need a nsIFile for location
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| 348 | if (!m_dllSpec)
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| 349 | {
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| 350 | return NS_ERROR_FAILURE;
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| 351 | }
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| 352 |
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| 353 | nsGetModuleProc proc =
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| 354 | (nsGetModuleProc) FindSymbol(NS_GET_MODULE_SYMBOL);
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| 355 |
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| 356 | if (proc == NULL)
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| 357 | return NS_ERROR_FACTORY_NOT_LOADED;
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| 358 |
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| 359 | nsresult rv = (*proc) (compMgr, m_dllSpec, &m_moduleObject);
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| 360 | if (NS_SUCCEEDED(rv))
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| 361 | {
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| 362 | NS_ADDREF(m_moduleObject);
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| 363 | *cobj = m_moduleObject;
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| 364 | }
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| 365 | return rv;
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| 366 | }
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| 367 |
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| 368 |
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| 369 | // These are used by BreakAfterLoad, below.
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| 370 | #ifdef SHOULD_IMPLEMENT_BREAKAFTERLOAD
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| 371 | static nsCString *sBreakList[16];
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| 372 | static int sBreakListCount = 0;
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| 373 | #endif
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| 374 |
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| 375 | nsresult nsDll::Shutdown(void)
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| 376 | {
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| 377 | // Release the module object if we got one
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| 378 | nsrefcnt refcnt;
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| 379 | if (m_moduleObject)
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| 380 | {
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| 381 | NS_RELEASE2(m_moduleObject, refcnt);
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| 382 | NS_ASSERTION(refcnt == 0, "Dll moduleObject refcount non zero");
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| 383 | }
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| 384 | #ifdef SHOULD_IMPLEMENT_BREAKAFTERLOAD
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| 385 | for (int i = 0; i < sBreakListCount; i++)
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| 386 | {
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| 387 | delete sBreakList[i];
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| 388 | sBreakList[i] = nsnull;
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| 389 | }
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| 390 | sBreakListCount = 0;
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| 391 | #endif
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| 392 | return NS_OK;
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| 393 |
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| 394 | }
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| 395 | #ifdef SHOULD_IMPLEMENT_BREAKAFTERLOAD
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| 396 | void nsDll::BreakAfterLoad(const char *nsprPath)
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| 397 | {
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| 398 | static PRBool firstTime = PR_TRUE;
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| 399 |
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| 400 | // return if invalid input
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| 401 | if (!nsprPath || !*nsprPath) return;
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| 402 |
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| 403 | // return if nothing to break on
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| 404 | if (!firstTime && sBreakListCount == 0) return;
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| 405 |
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| 406 | if (firstTime)
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| 407 | {
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| 408 | firstTime = PR_FALSE;
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| 409 | // Form the list of dlls to break on load
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| 410 | nsCAutoString envList(getenv("XPCOM_BREAK_ON_LOAD"));
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| 411 | if (envList.IsEmpty()) return;
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| 412 | PRInt32 ofset = 0;
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| 413 | PRInt32 start = 0;
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| 414 | do
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| 415 | {
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| 416 | ofset = envList.FindChar(':', start);
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| 417 | sBreakList[sBreakListCount] = new nsCString();
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| 418 | envList.Mid(*(sBreakList[sBreakListCount]), start, ofset);
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| 419 | sBreakListCount++;
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| 420 | start = ofset + 1;
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| 421 | }
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| 422 | while (ofset != -1 && 16 > sBreakListCount); // avoiding vc6.0 compiler issue. count < thinks it is starting a template
|
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| 423 | }
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| 424 |
|
|---|
| 425 | // Find the dllname part of the string
|
|---|
| 426 | nsCString currentPath(nsprPath);
|
|---|
| 427 | PRInt32 lastSep = currentPath.RFindCharInSet(":\\/");
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|---|
| 428 |
|
|---|
| 429 | for (int i=0; i<sBreakListCount; i++)
|
|---|
| 430 | if (currentPath.Find(*(sBreakList[i]), PR_TRUE, lastSep) > 0)
|
|---|
| 431 | {
|
|---|
| 432 | // Loading a dll that we want to break on
|
|---|
| 433 | // Put your breakpoint here
|
|---|
| 434 | fprintf(stderr, "...Loading module %s\n", nsprPath);
|
|---|
| 435 | // Break in the debugger here.
|
|---|
| 436 | #if defined(__i386) && defined(__GNUC__)
|
|---|
| 437 | asm("int $3");
|
|---|
| 438 | #elif defined(VMS)
|
|---|
| 439 | lib$signal(SS$_DEBUG);
|
|---|
| 440 | #elif defined(XP_MACOSX)
|
|---|
| 441 | raise(SIGTRAP);
|
|---|
| 442 | #endif
|
|---|
| 443 | }
|
|---|
| 444 | return;
|
|---|
| 445 | }
|
|---|
| 446 | #endif /* SHOULD_IMPLEMENT_BREAKAFTERLOAD */
|
|---|
