1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
|
/****************************************************************************
**
** 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)
: e(throwingContext->engine)
{
e->exceptionValue = 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);
e->exceptionValue = Value::undefinedValue();
}
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
|
