1/****************************************************************************
2**
3** Copyright (C) 2018 The Qt Company Ltd.
4** Contact: https://www.qt.io/licensing/
5**
6** This file is part of the QtQml module of the Qt Toolkit.
7**
8** $QT_BEGIN_LICENSE:LGPL$
9** Commercial License Usage
10** Licensees holding valid commercial Qt licenses may use this file in
11** accordance with the commercial license agreement provided with the
12** Software or, alternatively, in accordance with the terms contained in
13** a written agreement between you and The Qt Company. For licensing terms
14** and conditions see https://www.qt.io/terms-conditions. For further
15** information use the contact form at https://www.qt.io/contact-us.
16**
17** GNU Lesser General Public License Usage
18** Alternatively, this file may be used under the terms of the GNU Lesser
19** General Public License version 3 as published by the Free Software
20** Foundation and appearing in the file LICENSE.LGPL3 included in the
21** packaging of this file. Please review the following information to
22** ensure the GNU Lesser General Public License version 3 requirements
23** will be met: https://www.gnu.org/licenses/lgpl-3.0.html.
24**
25** GNU General Public License Usage
26** Alternatively, this file may be used under the terms of the GNU
27** General Public License version 2.0 or (at your option) the GNU General
28** Public license version 3 or any later version approved by the KDE Free
29** Qt Foundation. The licenses are as published by the Free Software
30** Foundation and appearing in the file LICENSE.GPL2 and LICENSE.GPL3
31** included in the packaging of this file. Please review the following
32** information to ensure the GNU General Public License requirements will
33** be met: https://www.gnu.org/licenses/gpl-2.0.html and
34** https://www.gnu.org/licenses/gpl-3.0.html.
35**
36** $QT_END_LICENSE$
37**
38****************************************************************************/
39
40#ifndef QV4BYTECODEHANDLER_P_H
41#define QV4BYTECODEHANDLER_P_H
42
43//
44// W A R N I N G
45// -------------
46//
47// This file is not part of the Qt API. It exists purely as an
48// implementation detail. This header file may change from version to
49// version without notice, or even be removed.
50//
51// We mean it.
52//
53#include <private/qv4instr_moth_p.h>
54
55QT_BEGIN_NAMESPACE
56
57namespace QV4 {
58namespace Moth {
59
60#define BYTECODE_HANDLER_DEFINE_ARGS(nargs, ...) \
61 MOTH_EXPAND_FOR_MSVC(BYTECODE_HANDLER_DEFINE_ARGS##nargs(__VA_ARGS__))
62
63#define BYTECODE_HANDLER_DEFINE_ARGS0()
64#define BYTECODE_HANDLER_DEFINE_ARGS1(arg) \
65 int arg
66#define BYTECODE_HANDLER_DEFINE_ARGS2(arg1, arg2) \
67 int arg1, \
68 int arg2
69#define BYTECODE_HANDLER_DEFINE_ARGS3(arg1, arg2, arg3) \
70 int arg1, \
71 int arg2, \
72 int arg3
73#define BYTECODE_HANDLER_DEFINE_ARGS4(arg1, arg2, arg3, arg4) \
74 int arg1, \
75 int arg2, \
76 int arg3, \
77 int arg4
78#define BYTECODE_HANDLER_DEFINE_ARGS5(arg1, arg2, arg3, arg4, arg5) \
79 int arg1, \
80 int arg2, \
81 int arg3, \
82 int arg4, \
83 int arg5
84
85#define BYTECODE_HANDLER_DEFINE_VIRTUAL_BYTECODE_HANDLER_INSTRUCTION(name, nargs, ...) \
86 virtual void generate_##name( \
87 BYTECODE_HANDLER_DEFINE_ARGS(nargs, __VA_ARGS__) \
88 ) = 0;
89
90#define BYTECODE_HANDLER_DEFINE_VIRTUAL_BYTECODE_HANDLER(instr) \
91 INSTR_##instr(BYTECODE_HANDLER_DEFINE_VIRTUAL_BYTECODE_HANDLER)
92
93class ByteCodeHandler
94{
95public:
96 virtual ~ByteCodeHandler();
97
98 void decode(const char *code, uint len);
99
100 int currentInstructionOffset() const { return _currentOffset; }
101 int nextInstructionOffset() const { return _nextOffset; }
102 int absoluteOffset(int relativeOffset) const
103 { return nextInstructionOffset() + relativeOffset; }
104
105protected:
106 FOR_EACH_MOTH_INSTR(BYTECODE_HANDLER_DEFINE_VIRTUAL_BYTECODE_HANDLER)
107
108 enum Verdict { ProcessInstruction, SkipInstruction };
109 virtual Verdict startInstruction(Moth::Instr::Type instr) = 0;
110 virtual void endInstruction(Moth::Instr::Type instr) = 0;
111
112private:
113 int _currentOffset = 0;
114 int _nextOffset = 0;
115};
116
117} // Moth namespace
118} // QV4 namespace
119
120QT_END_NAMESPACE
121
122#endif // QV4BYTECODEHANDLER_P_H
123

source code of qtdeclarative/src/qml/compiler/qv4bytecodehandler_p.h