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/****************************************************************************
**
** Copyright (C) 2013 Digia Plc and/or its subsidiary(-ies).
** Contact: http://www.qt-project.org/legal
**
** This file is part of the QtQml 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 Digia. For licensing terms and
** conditions see http://qt.digia.com/licensing. For further information
** use the contact form at http://qt.digia.com/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 as published by the Free Software
** Foundation and appearing in the file LICENSE.LGPL included in the
** packaging of this file. Please review the following information to
** ensure the GNU Lesser General Public License version 2.1 requirements
** will be met: http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.
**
** In addition, as a special exception, Digia gives you certain additional
** rights. These rights are described in the Digia Qt 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 "qv4exception_p.h"
#include "qv4errorobject_p.h"
#include "qv4debugging_p.h"
#include "qv4unwindhelper_p.h"
#include <wtf/Platform.h>
#if USE(LIBUNWIND_DEBUG)
#include <libunwind.h>
#include <execinfo.h>
#endif
QT_BEGIN_NAMESPACE
using namespace QV4;
void Exception::throwException(ExecutionContext *context, const Value &value)
{
if (context->engine->debugger)
context->engine->debugger->aboutToThrow(value);
UnwindHelper::prepareForUnwind(context);
#if USE(LIBUNWIND_DEBUG)
printf("about to throw exception. walking stack first with libunwind:\n");
unw_cursor_t cursor; unw_context_t uc;
unw_word_t ip, sp;
unw_getcontext(&uc);
unw_init_local(&cursor, &uc);
while (unw_step(&cursor) > 0) {
unw_get_reg(&cursor, UNW_REG_IP, &ip);
unw_get_reg(&cursor, UNW_REG_SP, &sp);
printf("ip = %lx, sp = %lx ", (long) ip, (long) sp);
void * const addr = (void*)ip;
char **symbol = backtrace_symbols(&addr, 1);
printf("%s", symbol[0]);
free(symbol);
printf("\n");
}
printf("stack walked. throwing exception now...\n");
#endif
throwInternal(context, value);
}
Exception::Exception(ExecutionContext *throwingContext, const Value &exceptionValue)
: exception(exceptionValue)
{
this->throwingContext = throwingContext->engine->current;
accepted = false;
if (ErrorObject *error = exceptionValue.asErrorObject())
m_stackTrace = error->stackTrace;
else
m_stackTrace = throwingContext->engine->stackTrace();
}
Exception::~Exception()
{
assert(accepted);
}
void Exception::accept(ExecutionContext *catchingContext)
{
assert(!accepted);
accepted = true;
partiallyUnwindContext(catchingContext);
}
void Exception::partiallyUnwindContext(ExecutionContext *catchingContext)
{
if (!throwingContext)
return;
ExecutionContext *context = throwingContext;
while (context != catchingContext)
context = context->engine->popContext();
throwingContext = context;
}
#if !defined(V4_CXX_ABI_EXCEPTION)
void Exception::throwInternal(ExecutionContext *throwingContext, const Value &exceptionValue)
{
throw Exception(throwingContext, exceptionValue);
}
#endif
QT_END_NAMESPACE
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