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katie/src/core/plugin/qlibrary.cpp
Ivailo Monev cd876daf6a no need to insert the build key into the plugin verification data now 
for various reasons Katie does not check the plugin build key, i.e.
the plugin and Katie build keys does not have to match for the plugin
to be considered valid so there is no need to extract the key

Signed-off-by: Ivailo Monev <xakepa10@gmail.com>
2015-12-24 07:21:48 +02:00

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/****************************************************************************
**
** Copyright (C) 2015 The Qt Company Ltd.
** Contact: http://www.qt.io/licensing/
**
** This file is part of the QtCore module of the Qt Toolkit.
**
** $QT_BEGIN_LICENSE:LGPL$
** Commercial License Usage
** Licensees holding valid commercial Qt licenses may use this file in
** accordance with the commercial license agreement provided with the
** Software or, alternatively, in accordance with the terms contained in
** a written agreement between you and The Qt Company. For licensing terms
** and conditions see http://www.qt.io/terms-conditions. For further
** information use the contact form at http://www.qt.io/contact-us.
**
** GNU Lesser General Public License Usage
** Alternatively, this file may be used under the terms of the GNU Lesser
** General Public License version 2.1 or version 3 as published by the Free
** Software Foundation and appearing in the file LICENSE.LGPLv21 and
** LICENSE.LGPLv3 included in the packaging of this file. Please review the
** following information to ensure the GNU Lesser General Public License
** requirements will be met: https://www.gnu.org/licenses/lgpl.html and
** http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.
**
** As a special exception, The Qt Company gives you certain additional
** rights. These rights are described in The Qt Company LGPL Exception
** version 1.1, included in the file LGPL_EXCEPTION.txt in this package.
**
** GNU General Public License Usage
** Alternatively, this file may be used under the terms of the GNU
** General Public License version 3.0 as published by the Free Software
** Foundation and appearing in the file LICENSE.GPL included in the
** packaging of this file. Please review the following information to
** ensure the GNU General Public License version 3.0 requirements will be
** met: http://www.gnu.org/copyleft/gpl.html.
**
** $QT_END_LICENSE$
**
****************************************************************************/
#include "qconfig.h"
#include "qplatformdefs.h"
#include "qlibrary.h"
#ifndef QT_NO_LIBRARY
#include "qlibrary_p.h"
#include <qstringlist.h>
#include <qfile.h>
#include <qfileinfo.h>
#include <qmutex.h>
#include <qmap.h>
#include <qsettings.h>
#include <qdatetime.h>
#include <qcoreapplication_p.h>
#ifdef Q_OS_MAC
# include <qcore_mac_p.h>
#endif
#ifndef NO_ERRNO_H
#include <errno.h>
#endif // NO_ERROR_H
#include <qdebug.h>
#include <qvector.h>
#include <qdir.h>
#include "qelfparser_p.h"
QT_BEGIN_NAMESPACE
#ifdef QT_NO_DEBUG
# define QLIBRARY_AS_DEBUG false
#else
# define QLIBRARY_AS_DEBUG true
#endif
#if defined(Q_OS_UNIX) && !defined(Q_OS_MAC)
// We don't use separate debug and release libs on UNIX, so we want
// to allow loading plugins, regardless of how they were built.
# define QT_NO_DEBUG_PLUGIN_CHECK
#endif
Q_GLOBAL_STATIC(QMutex, qt_library_mutex)
/*!
\class QLibrary
\reentrant
\brief The QLibrary class loads shared libraries at runtime.
\ingroup plugins
An instance of a QLibrary object operates on a single shared
object file (which we call a "library", but is also known as a
"DLL"). A QLibrary provides access to the functionality in the
library in a platform independent way. You can either pass a file
name in the constructor, or set it explicitly with setFileName().
When loading the library, QLibrary searches in all the
system-specific library locations (e.g. \c LD_LIBRARY_PATH on
Unix), unless the file name has an absolute path. If the file
cannot be found, QLibrary tries the name with different
platform-specific file suffixes, like ".so" on Unix, ".dylib" on
the Mac, or ".dll" on Windows. This makes it possible
to specify shared libraries that are only identified by their
basename (i.e. without their suffix), so the same code will work
on different operating systems.
The most important functions are load() to dynamically load the
library file, isLoaded() to check whether loading was successful,
and resolve() to resolve a symbol in the library. The resolve()
function implicitly tries to load the library if it has not been
loaded yet. Multiple instances of QLibrary can be used to access
the same physical library. Once loaded, libraries remain in memory
until the application terminates. You can attempt to unload a
library using unload(), but if other instances of QLibrary are
using the same library, the call will fail, and unloading will
only happen when every instance has called unload().
A typical use of QLibrary is to resolve an exported symbol in a
library, and to call the C function that this symbol represents.
This is called "explicit linking" in contrast to "implicit
linking", which is done by the link step in the build process when
linking an executable against a library.
The following code snippet loads a library, resolves the symbol
"mysymbol", and calls the function if everything succeeded. If
something goes wrong, e.g. the library file does not exist or the
symbol is not defined, the function pointer will be 0 and won't be
called.
\snippet doc/src/snippets/code/src_corelib_plugin_qlibrary.cpp 0
The symbol must be exported as a C function from the library for
resolve() to work. This means that the function must be wrapped in
an \c{extern "C"} block if the library is compiled with a C++
compiler. On Windows, this also requires the use of a \c dllexport
macro; see resolve() for the details of how this is done. For
convenience, there is a static resolve() function which you can
use if you just want to call a function in a library without
explicitly loading the library first:
\snippet doc/src/snippets/code/src_corelib_plugin_qlibrary.cpp 1
\sa QPluginLoader
*/
/*!
\enum QLibrary::LoadHint
This enum describes the possible hints that can be used to change the way
libraries are handled when they are loaded. These values indicate how
symbols are resolved when libraries are loaded, and are specified using
the setLoadHints() function.
\value ResolveAllSymbolsHint
Causes all symbols in a library to be resolved when it is loaded, not
simply when resolve() is called.
\value ExportExternalSymbolsHint
Exports unresolved and external symbols in the library so that they can be
resolved in other dynamically-loaded libraries loaded later.
\value LoadArchiveMemberHint
Allows the file name of the library to specify a particular object file
within an archive file.
If this hint is given, the filename of the library consists of
a path, which is a reference to an archive file, followed by
a reference to the archive member.
\sa loadHints
*/
#ifndef QT_NO_PLUGIN_CHECK
struct qt_token_info
{
qt_token_info(const char *f, const ulong fc)
: fields(f), field_count(fc), results(fc), lengths(fc)
{
results.fill(0);
lengths.fill(0);
}
const char *fields;
const ulong field_count;
QVector<const char *> results;
QVector<ulong> lengths;
};
/*
return values:
1 parse ok
0 eos
-1 parse error
*/
static int qt_tokenize(const char *s, ulong s_len, ulong *advance,
qt_token_info &token_info)
{
if (!s)
return -1;
ulong pos = 0, field = 0, fieldlen = 0;
char current;
int ret = -1;
*advance = 0;
for (;;) {
current = s[pos];
// next char
++pos;
++fieldlen;
++*advance;
if (! current || pos == s_len + 1) {
// save result
token_info.results[(int)field] = s;
token_info.lengths[(int)field] = fieldlen - 1;
// end of string
ret = 0;
break;
}
if (current == token_info.fields[field]) {
// save result
token_info.results[(int)field] = s;
token_info.lengths[(int)field] = fieldlen - 1;
// end of field
fieldlen = 0;
++field;
if (field == token_info.field_count - 1) {
// parse ok
ret = 1;
}
if (field == token_info.field_count) {
// done parsing
break;
}
// reset string and its length
s = s + pos;
s_len -= pos;
pos = 0;
}
}
return ret;
}
/*
returns true if the string s was correctly parsed, false otherwise.
*/
static bool qt_parse_pattern(const char *s, uint *version, bool *debug)
{
bool ret = true;
qt_token_info pinfo("=\n", 2);
int parse;
ulong at = 0, advance, parselen = qstrlen(s);
do {
parse = qt_tokenize(s + at, parselen, &advance, pinfo);
if (parse == -1) {
ret = false;
break;
}
at += advance;
parselen -= advance;
if (qstrncmp("version", pinfo.results[0], pinfo.lengths[0]) == 0) {
// parse version string
qt_token_info pinfo2("..-", 3);
if (qt_tokenize(pinfo.results[1], pinfo.lengths[1],
&advance, pinfo2) != -1) {
QByteArray m(pinfo2.results[0], pinfo2.lengths[0]);
QByteArray n(pinfo2.results[1], pinfo2.lengths[1]);
QByteArray p(pinfo2.results[2], pinfo2.lengths[2]);
*version = (m.toUInt() << 16) | (n.toUInt() << 8) | p.toUInt();
} else {
ret = false;
break;
}
} else if (qstrncmp("debug", pinfo.results[0], pinfo.lengths[0]) == 0) {
*debug = qstrncmp("true", pinfo.results[1], pinfo.lengths[1]) == 0;
}
} while (parse == 1 && parselen > 0);
return ret;
}
#endif // QT_NO_PLUGIN_CHECK
#if defined(Q_OS_UNIX) && !defined(Q_OS_MAC) && !defined(QT_NO_PLUGIN_CHECK)
static long qt_find_pattern(const char *s, ulong s_len,
const char *pattern, ulong p_len)
{
/*
we search from the end of the file because on the supported
systems, the read-only data/text segments are placed at the end
of the file. HOWEVER, when building with debugging enabled, all
the debug symbols are placed AFTER the data/text segments.
what does this mean? when building in release mode, the search
is fast because the data we are looking for is at the end of the
file... when building in debug mode, the search is slower
because we have to skip over all the debugging symbols first
*/
if (! s || ! pattern || p_len > s_len) return -1;
ulong i, hs = 0, hp = 0, delta = s_len - p_len;
for (i = 0; i < p_len; ++i) {
hs += s[delta + i];
hp += pattern[i];
}
i = delta;
for (;;) {
if (hs == hp && qstrncmp(s + i, pattern, p_len) == 0)
return i;
if (i == 0)
break;
--i;
hs -= s[i + p_len];
hs += s[i];
}
return -1;
}
/*
This opens the specified library, mmaps it into memory, and searches
for the QT_PLUGIN_VERIFICATION_DATA. The advantage of this approach is that
we can get the verification data without have to actually load the library.
This lets us detect mismatches more safely.
Returns false if version information is not present, or if the
information could not be read.
Returns true if version information is present and successfully read.
*/
static bool qt_unix_query(const QString &library, uint *version, bool *debug, QLibraryPrivate *lib = 0)
{
QFile file(library);
if (!file.open(QIODevice::ReadOnly)) {
if (lib)
lib->errorString = file.errorString();
if (qt_debug_component()) {
qWarning("%s: %s", (const char*) QFile::encodeName(library),
qPrintable(qt_error_string(errno)));
}
return false;
}
QByteArray data;
const char *filedata = 0;
ulong fdlen = file.size();
filedata = (char *) file.map(0, fdlen);
if (filedata == 0) {
// try reading the data into memory instead
data = file.readAll();
filedata = data.constData();
fdlen = data.size();
}
/*
ELF binaries on GNU, have .qplugin sections.
*/
long pos = 0;
const char pattern[] = "pattern=QT_PLUGIN_VERIFICATION_DATA";
const ulong plen = qstrlen(pattern);
#if defined (Q_OF_ELF) && defined(Q_CC_GNU)
int r = QElfParser().parse(filedata, fdlen, library, lib, &pos, &fdlen);
if (r == QElfParser::NoQtSection) {
if (pos > 0) {
// find inside .rodata
long rel = qt_find_pattern(filedata + pos, fdlen, pattern, plen);
if (rel < 0) {
pos = -1;
} else {
pos += rel;
}
} else {
pos = qt_find_pattern(filedata, fdlen, pattern, plen);
}
} else if (r != QElfParser::Ok) {
if (lib && qt_debug_component()) {
qWarning("QElfParser: %s",qPrintable(lib->errorString));
}
return false;
}
#else
pos = qt_find_pattern(filedata, fdlen, pattern, plen);
#endif // defined(Q_OF_ELF) && defined(Q_CC_GNU)
bool ret = false;
if (pos >= 0)
ret = qt_parse_pattern(filedata + pos, version, debug);
if (!ret && lib)
lib->errorString = QLibrary::tr("Plugin verification data mismatch in '%1'").arg(library);
file.close();
return ret;
}
#endif // Q_OS_UNIX && !Q_OS_MAC && !defined(QT_NO_PLUGIN_CHECK)
typedef QMap<QString, QLibraryPrivate*> LibraryMap;
struct LibraryData {
LibraryMap libraryMap;
QSet<QLibraryPrivate*> loadedLibs;
};
Q_GLOBAL_STATIC(LibraryData, libraryData)
static LibraryMap *libraryMap()
{
LibraryData *data = libraryData();
return data ? &data->libraryMap : 0;
}
QLibraryPrivate::QLibraryPrivate(const QString &canonicalFileName, const QString &version)
:pHnd(0), fileName(canonicalFileName), fullVersion(version), instance(0), qt_version(0),
libraryRefCount(1), libraryUnloadCount(0), pluginState(MightBeAPlugin)
{ libraryMap()->insert(canonicalFileName, this); }
QLibraryPrivate *QLibraryPrivate::findOrCreate(const QString &fileName, const QString &version)
{
QMutexLocker locker(qt_library_mutex());
if (QLibraryPrivate *lib = libraryMap()->value(fileName)) {
lib->libraryRefCount.ref();
return lib;
}
return new QLibraryPrivate(fileName, version);
}
QLibraryPrivate::~QLibraryPrivate()
{
LibraryMap * const map = libraryMap();
if (map) {
QLibraryPrivate *that = map->take(fileName);
Q_ASSERT(this == that);
Q_UNUSED(that);
}
}
void *QLibraryPrivate::resolve(const char *symbol)
{
if (!pHnd)
return 0;
return resolve_sys(symbol);
}
bool QLibraryPrivate::load()
{
libraryUnloadCount.ref();
if (pHnd)
return true;
if (fileName.isEmpty())
return false;
bool ret = load_sys();
if (ret) {
//when loading a library we add a reference to it so that the QLibraryPrivate won't get deleted
//this allows to unload the library at a later time
if (LibraryData *lib = libraryData()) {
lib->loadedLibs += this;
libraryRefCount.ref();
}
}
return ret;
}
bool QLibraryPrivate::unload()
{
if (!pHnd)
return false;
if (!libraryUnloadCount.deref()) { // only unload if ALL QLibrary instance wanted to
delete inst.data();
if (unload_sys()) {
if (qt_debug_component())
qWarning() << "QLibraryPrivate::unload succeeded on" << fileName;
//when the library is unloaded, we release the reference on it so that 'this'
//can get deleted
if (LibraryData *lib = libraryData()) {
if (lib->loadedLibs.remove(this))
libraryRefCount.deref();
}
pHnd = 0;
}
}
return (pHnd == 0);
}
void QLibraryPrivate::release()
{
QMutexLocker locker(qt_library_mutex());
if (!libraryRefCount.deref())
delete this;
}
bool QLibraryPrivate::loadPlugin()
{
if (instance) {
libraryUnloadCount.ref();
return true;
}
if (pluginState == IsNotAPlugin)
return false;
if (load()) {
instance = (QtPluginInstanceFunction)resolve("qt_plugin_instance");
return instance;
}
if (qt_debug_component())
qWarning() << "QLibraryPrivate::loadPlugin failed on" << fileName << ":" << errorString;
pluginState = IsNotAPlugin;
return false;
}
/*!
Returns true if \a fileName has a valid suffix for a loadable
library; otherwise returns false.
\table
\header \i Platform \i Valid suffixes
\row \i Windows \i \c .dll, \c .DLL
\row \i Unix/Linux \i \c .so
\row \i AIX \i \c .a
\row \i HP-UX \i \c .sl, \c .so (HP-UXi)
\row \i Mac OS X \i \c .dylib, \c .bundle, \c .so
\endtable
Trailing versioning numbers on Unix are ignored.
*/
bool QLibrary::isLibrary(const QString &fileName)
{
#if defined(Q_OS_WIN32) || defined(Q_OS_WINCE)
return fileName.endsWith(QLatin1String(".dll"), Qt::CaseInsensitive);
#else
QString completeSuffix = QFileInfo(fileName).completeSuffix();
if (completeSuffix.isEmpty())
return false;
QStringList suffixes = completeSuffix.split(QLatin1Char('.'));
# if defined(Q_OS_DARWIN)
// On Mac, libs look like libmylib.1.0.0.dylib
const QString lastSuffix = suffixes.at(suffixes.count() - 1);
const QString firstSuffix = suffixes.at(0);
bool valid = (lastSuffix == QLatin1String("dylib")
|| firstSuffix == QLatin1String("so")
|| firstSuffix == QLatin1String("bundle"));
return valid;
# else // Generic Unix
QStringList validSuffixList;
# if defined(Q_OS_HPUX)
/*
See "HP-UX Linker and Libraries User's Guide", section "Link-time Differences between PA-RISC and IPF":
"In PA-RISC (PA-32 and PA-64) shared libraries are suffixed with .sl. In IPF (32-bit and 64-bit),
the shared libraries are suffixed with .so. For compatibility, the IPF linker also supports the .sl suffix."
*/
validSuffixList << QLatin1String("sl");
# if defined __ia64
validSuffixList << QLatin1String("so");
# endif
# elif defined(Q_OS_AIX)
validSuffixList << QLatin1String("a") << QLatin1String("so");
# elif defined(Q_OS_UNIX)
validSuffixList << QLatin1String("so");
# endif
// Examples of valid library names:
// libfoo.so
// libfoo.so.0
// libfoo.so.0.3
// libfoo-0.3.so
// libfoo-0.3.so.0.3.0
int suffix;
int suffixPos = -1;
for (suffix = 0; suffix < validSuffixList.count() && suffixPos == -1; ++suffix)
suffixPos = suffixes.indexOf(validSuffixList.at(suffix));
bool valid = suffixPos != -1;
for (int i = suffixPos + 1; i < suffixes.count() && valid; ++i)
if (i != suffixPos)
suffixes.at(i).toInt(&valid);
return valid;
# endif
#endif
}
#if defined (Q_OS_WIN) && defined(_MSC_VER) && _MSC_VER >= 1400 && !defined(Q_CC_INTEL)
#define QT_USE_MS_STD_EXCEPTION 1
const char* qt_try_versioninfo(void *pfn, bool *exceptionThrown)
{
*exceptionThrown = false;
const char *szData = 0;
typedef const char * (*VerificationFunction)();
VerificationFunction func = reinterpret_cast<VerificationFunction>(pfn);
__try {
if(func)
szData = func();
} __except(EXCEPTION_EXECUTE_HANDLER) {
*exceptionThrown = true;
}
return szData;
}
#endif
#ifdef Q_CC_BOR
typedef const char * __stdcall (*QtPluginQueryVerificationDataFunction)();
#else
typedef const char * (*QtPluginQueryVerificationDataFunction)();
#endif
bool qt_get_verificationdata(QtPluginQueryVerificationDataFunction pfn, uint *qt_version, bool *debug, bool *exceptionThrown)
{
*exceptionThrown = false;
const char *szData = 0;
if (!pfn)
return false;
#ifdef QT_USE_MS_STD_EXCEPTION
szData = qt_try_versioninfo((void *)pfn, exceptionThrown);
if (*exceptionThrown)
return false;
#else
szData = pfn();
#endif
#ifdef QT_NO_PLUGIN_CHECK
return true;
#else
return qt_parse_pattern(szData, qt_version, debug);
#endif
}
bool QLibraryPrivate::isPlugin(QSettings *settings)
{
errorString.clear();
if (pluginState != MightBeAPlugin)
return pluginState == IsAPlugin;
#ifndef QT_NO_PLUGIN_CHECK
bool debug = !QLIBRARY_AS_DEBUG;
bool success = false;
#if defined(Q_OS_UNIX) && !defined(Q_OS_MAC)
if (fileName.endsWith(QLatin1String(".debug"))) {
// refuse to load a file that ends in .debug
// these are the debug symbols from the libraries
// the problem is that they are valid shared library files
// and dlopen is known to crash while opening them
// pretend we didn't see the file
errorString = QLibrary::tr("The shared library was not found.");
pluginState = IsNotAPlugin;
return false;
}
#endif
QFileInfo fileinfo(fileName);
#ifndef QT_NO_DATESTRING
lastModified = fileinfo.lastModified().toString(Qt::ISODate);
#endif
QString regkey = QString::fromLatin1("Qt Plugin Cache %1.%2.%3/%4")
.arg((QT_VERSION & 0xff0000) >> 16)
.arg((QT_VERSION & 0xff00) >> 8)
.arg(QLIBRARY_AS_DEBUG ? QLatin1String("debug") : QLatin1String("false"))
.arg(fileName);
#ifdef Q_WS_MAC
// On Mac, add the application arch to the reg key in order to
// cache plugin information separately for each arch. This prevents
// Qt from wrongly caching plugin load failures when the archs
// don't match.
#if defined(__x86_64__)
regkey += QLatin1String("-x86_64");
#elif defined(__i386__)
regkey += QLatin1String("-i386");
#elif defined(__ppc64__)
regkey += QLatin1String("-ppc64");
#elif defined(__ppc__)
regkey += QLatin1String("-ppc");
#endif
#endif // Q_WS_MAC
QStringList reg;
#ifndef QT_NO_SETTINGS
if (!settings) {
settings = QCoreApplicationPrivate::trolltechConf();
}
reg = settings->value(regkey).toStringList();
#endif
if (reg.count() == 4 && lastModified == reg.at(3)) {
qt_version = reg.at(0).toUInt(0, 16);
debug = bool(reg.at(1).toInt());
success = qt_version != 0;
} else {
#if defined(Q_OS_UNIX) && !defined(Q_OS_MAC)
if (!pHnd) {
// use unix shortcut to avoid loading the library
success = qt_unix_query(fileName, &qt_version, &debug, this);
} else
#endif
{
bool retryLoadLibrary = false; // Only used on Windows with MS compiler.(false in other cases)
do {
bool temporary_load = false;
#ifdef Q_OS_WIN
HMODULE hTempModule = 0;
#endif
if (!pHnd) {
#ifdef Q_OS_WIN
DWORD dwFlags = (retryLoadLibrary) ? 0: DONT_RESOLVE_DLL_REFERENCES;
//avoid 'Bad Image' message box
UINT oldmode = SetErrorMode(SEM_FAILCRITICALERRORS|SEM_NOOPENFILEERRORBOX);
hTempModule = ::LoadLibraryEx((wchar_t*)QDir::toNativeSeparators(fileName).utf16(), 0, dwFlags);
SetErrorMode(oldmode);
#else
temporary_load = load_sys();
#endif
}
#ifdef Q_OS_WIN
QtPluginQueryVerificationDataFunction qtPluginQueryVerificationDataFunction = hTempModule ? (QtPluginQueryVerificationDataFunction)
#ifdef Q_OS_WINCE
::GetProcAddress(hTempModule, L"qt_plugin_query_verification_data")
#else
::GetProcAddress(hTempModule, "qt_plugin_query_verification_data")
#endif
: (QtPluginQueryVerificationDataFunction) resolve("qt_plugin_query_verification_data");
#else
QtPluginQueryVerificationDataFunction qtPluginQueryVerificationDataFunction = NULL;
qtPluginQueryVerificationDataFunction = (QtPluginQueryVerificationDataFunction) resolve("qt_plugin_query_verification_data");
#endif
bool exceptionThrown = false;
bool ret = qt_get_verificationdata(qtPluginQueryVerificationDataFunction,
&qt_version, &debug, &exceptionThrown);
if (!exceptionThrown) {
if (!ret) {
qt_version = 0;
if (temporary_load)
unload_sys();
} else {
success = true;
}
retryLoadLibrary = false;
}
#ifdef QT_USE_MS_STD_EXCEPTION
else {
// An exception was thrown when calling qt_plugin_query_verification_data().
// This usually happens when plugin is compiled with the /clr compiler flag,
// & will only work if the dependencies are loaded & DLLMain() is called.
// LoadLibrary() will do this, try once with this & if it fails don't load.
retryLoadLibrary = !retryLoadLibrary;
}
#endif
#ifdef Q_OS_WIN
if (hTempModule) {
BOOL ok = ::FreeLibrary(hTempModule);
if (ok) {
hTempModule = 0;
}
}
#endif
} while(retryLoadLibrary); // Will be 'false' in all cases other than when an
// exception is thrown(will happen only when using a MS compiler)
}
#ifndef QT_NO_SETTINGS
QStringList queried;
queried << QString::number(qt_version,16)
<< QString::number((int)debug)
<< lastModified;
settings->setValue(regkey, queried);
#endif
}
if (!success) {
if (errorString.isEmpty()){
if (fileName.isEmpty())
errorString = QLibrary::tr("The shared library was not found.");
else
errorString = QLibrary::tr("The file '%1' is not a valid Qt plugin.").arg(fileName);
}
return false;
}
pluginState = IsNotAPlugin; // be pessimistic
if ((qt_version & 0x00ff00) > (QT_VERSION & 0x00ff00) || (qt_version & 0xff0000) != (QT_VERSION & 0xff0000)) {
if (qt_debug_component()) {
qWarning("In %s:\n"
" Plugin uses incompatible Qt library (%d.%d.%d) [%s]",
(const char*) QFile::encodeName(fileName),
(qt_version&0xff0000) >> 16, (qt_version&0xff00) >> 8, qt_version&0xff,
debug ? "debug" : "release");
}
errorString = QLibrary::tr("The plugin '%1' uses incompatible Qt library. (%2.%3.%4) [%5]")
.arg(fileName)
.arg((qt_version&0xff0000) >> 16)
.arg((qt_version&0xff00) >> 8)
.arg(qt_version&0xff)
.arg(debug ? QLatin1String("debug") : QLatin1String("release"));
#ifndef QT_NO_DEBUG_PLUGIN_CHECK
} else if(debug != QLIBRARY_AS_DEBUG) {
//don't issue a qWarning since we will hopefully find a non-debug? --Sam
errorString = QLibrary::tr("The plugin '%1' uses incompatible Qt library."
" (Cannot mix debug and release libraries.)").arg(fileName);
#endif
} else {
pluginState = IsAPlugin;
}
return pluginState == IsAPlugin;
#else
Q_UNUSED(settings);
return pluginState == MightBeAPlugin;
#endif
}
/*!
Loads the library and returns true if the library was loaded
successfully; otherwise returns false. Since resolve() always
calls this function before resolving any symbols it is not
necessary to call it explicitly. In some situations you might want
the library loaded in advance, in which case you would use this
function.
\sa unload()
*/
bool QLibrary::load()
{
if (!d)
return false;
if (did_load)
return d->pHnd;
did_load = true;
return d->load();
}
/*!
Unloads the library and returns true if the library could be
unloaded; otherwise returns false.
This happens automatically on application termination, so you
shouldn't normally need to call this function.
If other instances of QLibrary are using the same library, the
call will fail, and unloading will only happen when every instance
has called unload().
Note that on Mac OS X 10.3 (Panther), dynamic libraries cannot be unloaded.
\sa resolve(), load()
*/
bool QLibrary::unload()
{
if (did_load) {
did_load = false;
return d->unload();
}
return false;
}
/*!
Returns true if the library is loaded; otherwise returns false.
\sa load()
*/
bool QLibrary::isLoaded() const
{
return d && d->pHnd;
}
/*!
Constructs a library with the given \a parent.
*/
QLibrary::QLibrary(QObject *parent)
:QObject(parent), d(0), did_load(false)
{
}
/*!
Constructs a library object with the given \a parent that will
load the library specified by \a fileName.
We recommend omitting the file's suffix in \a fileName, since
QLibrary will automatically look for the file with the appropriate
suffix in accordance with the platform, e.g. ".so" on Unix,
".dylib" on Mac OS X, and ".dll" on Windows. (See \l{fileName}.)
*/
QLibrary::QLibrary(const QString& fileName, QObject *parent)
:QObject(parent), d(0), did_load(false)
{
setFileName(fileName);
}
/*!
Constructs a library object with the given \a parent that will
load the library specified by \a fileName and major version number \a verNum.
Currently, the version number is ignored on Windows.
We recommend omitting the file's suffix in \a fileName, since
QLibrary will automatically look for the file with the appropriate
suffix in accordance with the platform, e.g. ".so" on Unix,
".dylib" on Mac OS X, and ".dll" on Windows. (See \l{fileName}.)
*/
QLibrary::QLibrary(const QString& fileName, int verNum, QObject *parent)
:QObject(parent), d(0), did_load(false)
{
setFileNameAndVersion(fileName, verNum);
}
/*!
Constructs a library object with the given \a parent that will
load the library specified by \a fileName and full version number \a version.
Currently, the version number is ignored on Windows and Symbian.
We recommend omitting the file's suffix in \a fileName, since
QLibrary will automatically look for the file with the appropriate
suffix in accordance with the platform, e.g. ".so" on Unix,
".dylib" on Mac OS X, and ".dll" on Windows. (See \l{fileName}.)
*/
QLibrary::QLibrary(const QString& fileName, const QString &version, QObject *parent)
:QObject(parent), d(0), did_load(false)
{
setFileNameAndVersion(fileName, version);
}
/*!
Destroys the QLibrary object.
Unless unload() was called explicitly, the library stays in memory
until the application terminates.
\sa isLoaded(), unload()
*/
QLibrary::~QLibrary()
{
if (d)
d->release();
}
/*!
\property QLibrary::fileName
\brief the file name of the library
We recommend omitting the file's suffix in the file name, since
QLibrary will automatically look for the file with the appropriate
suffix (see isLibrary()).
When loading the library, QLibrary searches in all system-specific
library locations (e.g. \c LD_LIBRARY_PATH on Unix), unless the
file name has an absolute path. After loading the library
successfully, fileName() returns the fully-qualified file name of
the library, including the full path to the library if one was given
in the constructor or passed to setFileName().
For example, after successfully loading the "GL" library on Unix
platforms, fileName() will return "libGL.so". If the file name was
originally passed as "/usr/lib/libGL", fileName() will return
"/usr/lib/libGL.so".
*/
void QLibrary::setFileName(const QString &fileName)
{
QLibrary::LoadHints lh;
if (d) {
lh = d->loadHints;
d->release();
d = 0;
did_load = false;
}
d = QLibraryPrivate::findOrCreate(fileName);
d->loadHints = lh;
}
QString QLibrary::fileName() const
{
if (d)
return d->qualifiedFileName.isEmpty() ? d->fileName : d->qualifiedFileName;
return QString();
}
/*!
\fn void QLibrary::setFileNameAndVersion(const QString &fileName, int versionNumber)
Sets the fileName property and major version number to \a fileName
and \a versionNumber respectively.
The \a versionNumber is ignored on Windows.
\sa setFileName()
*/
void QLibrary::setFileNameAndVersion(const QString &fileName, int verNum)
{
QLibrary::LoadHints lh;
if (d) {
lh = d->loadHints;
d->release();
d = 0;
did_load = false;
}
d = QLibraryPrivate::findOrCreate(fileName, verNum >= 0 ? QString::number(verNum) : QString());
d->loadHints = lh;
}
/*!
\since 4.4
Sets the fileName property and full version number to \a fileName
and \a version respectively.
The \a version parameter is ignored on Windows.
\sa setFileName()
*/
void QLibrary::setFileNameAndVersion(const QString &fileName, const QString &version)
{
QLibrary::LoadHints lh;
if (d) {
lh = d->loadHints;
d->release();
d = 0;
did_load = false;
}
d = QLibraryPrivate::findOrCreate(fileName, version);
d->loadHints = lh;
}
/*!
Returns the address of the exported symbol \a symbol. The library is
loaded if necessary. The function returns 0 if the symbol could
not be resolved or if the library could not be loaded.
Example:
\snippet doc/src/snippets/code/src_corelib_plugin_qlibrary.cpp 2
The symbol must be exported as a C function from the library. This
means that the function must be wrapped in an \c{extern "C"} if
the library is compiled with a C++ compiler. On Windows you must
also explicitly export the function from the DLL using the
\c{__declspec(dllexport)} compiler directive, for example:
\snippet doc/src/snippets/code/src_corelib_plugin_qlibrary.cpp 3
with \c MY_EXPORT defined as
\snippet doc/src/snippets/code/src_corelib_plugin_qlibrary.cpp 4
*/
void *QLibrary::resolve(const char *symbol)
{
if (!isLoaded() && !load())
return 0;
return d->resolve(symbol);
}
/*!
\overload
Loads the library \a fileName and returns the address of the
exported symbol \a symbol. Note that \a fileName should not
include the platform-specific file suffix; (see \l{fileName}). The
library remains loaded until the application exits.
The function returns 0 if the symbol could not be resolved or if
the library could not be loaded.
\sa resolve()
*/
void *QLibrary::resolve(const QString &fileName, const char *symbol)
{
QLibrary library(fileName);
return library.resolve(symbol);
}
/*!
\overload
Loads the library \a fileName with major version number \a verNum and
returns the address of the exported symbol \a symbol.
Note that \a fileName should not include the platform-specific file suffix;
(see \l{fileName}). The library remains loaded until the application exits.
\a verNum is ignored on Windows.
The function returns 0 if the symbol could not be resolved or if
the library could not be loaded.
\sa resolve()
*/
void *QLibrary::resolve(const QString &fileName, int verNum, const char *symbol)
{
QLibrary library(fileName, verNum);
return library.resolve(symbol);
}
/*!
\overload
\since 4.4
Loads the library \a fileName with full version number \a version and
returns the address of the exported symbol \a symbol.
Note that \a fileName should not include the platform-specific file suffix;
(see \l{fileName}). The library remains loaded until the application exits.
\a version is ignored on Windows.
The function returns 0 if the symbol could not be resolved or if
the library could not be loaded.
\sa resolve()
*/
void *QLibrary::resolve(const QString &fileName, const QString &version, const char *symbol)
{
QLibrary library(fileName, version);
return library.resolve(symbol);
}
/*!
\fn QString QLibrary::library() const
Use fileName() instead.
*/
/*!
\fn void QLibrary::setAutoUnload( bool b )
Use load(), isLoaded(), and unload() as necessary instead.
*/
/*!
\since 4.2
Returns a text string with the description of the last error that occurred.
Currently, errorString will only be set if load(), unload() or resolve() for some reason fails.
*/
QString QLibrary::errorString() const
{
return (!d || d->errorString.isEmpty()) ? tr("Unknown error") : d->errorString;
}
/*!
\property QLibrary::loadHints
\brief Give the load() function some hints on how it should behave.
You can give some hints on how the symbols are resolved. Usually,
the symbols are not resolved at load time, but resolved lazily,
(that is, when resolve() is called). If you set the loadHint to
ResolveAllSymbolsHint, then all symbols will be resolved at load time
if the platform supports it.
Setting ExportExternalSymbolsHint will make the external symbols in the
library available for resolution in subsequent loaded libraries.
If LoadArchiveMemberHint is set, the file name
is composed of two components: A path which is a reference to an
archive file followed by the second component which is the reference to
the archive member. For instance, the fileName \c libGL.a(shr_64.o) will refer
to the library \c shr_64.o in the archive file named \c libGL.a. This
is only supported on the AIX platform.
The interpretation of the load hints is platform dependent, and if
you use it you are probably making some assumptions on which platform
you are compiling for, so use them only if you understand the consequences
of them.
By default, none of these flags are set, so libraries will be loaded with
lazy symbol resolution, and will not export external symbols for resolution
in other dynamically-loaded libraries.
*/
void QLibrary::setLoadHints(LoadHints hints)
{
if (!d) {
d = QLibraryPrivate::findOrCreate(QString()); // ugly, but we need a d-ptr
d->errorString.clear();
}
d->loadHints = hints;
}
QLibrary::LoadHints QLibrary::loadHints() const
{
return d ? d->loadHints : (QLibrary::LoadHints)0;
}
/* Internal, for debugging */
bool qt_debug_component()
{
static int debug_env = -1;
if (debug_env == -1)
debug_env = QT_PREPEND_NAMESPACE(qgetenv)("QT_DEBUG_PLUGINS").toInt();
return debug_env != 0;
}
#include "moc_qlibrary.h"
QT_END_NAMESPACE
#endif // QT_NO_LIBRARY
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