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
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
|
// Copyright (c) 2011 AlphaSierraPapa for the SharpDevelop Team
//
// Permission is hereby granted, free of charge, to any person obtaining a copy of this
// software and associated documentation files (the "Software"), to deal in the Software
// without restriction, including without limitation the rights to use, copy, modify, merge,
// publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons
// to whom the Software is furnished to do so, subject to the following conditions:
//
// The above copyright notice and this permission notice shall be included in all copies or
// substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED,
// INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR
// PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE
// FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR
// OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
// DEALINGS IN THE SOFTWARE.
using System;
using System.Collections.Generic;
using System.Diagnostics;
using System.Linq;
using Mono.Cecil;
namespace ICSharpCode.Decompiler.ILAst
{
public static class PatternMatching
{
public static bool Match(this ILNode node, ILCode code)
{
ILExpression expr = node as ILExpression;
return expr != null && expr.Prefixes == null && expr.Code == code;
}
public static bool Match<T>(this ILNode node, ILCode code, out T operand)
{
ILExpression expr = node as ILExpression;
if (expr != null && expr.Prefixes == null && expr.Code == code && expr.Arguments.Count == 0) {
operand = (T)expr.Operand;
return true;
}
operand = default(T);
return false;
}
public static bool Match(this ILNode node, ILCode code, out List<ILExpression> args)
{
ILExpression expr = node as ILExpression;
if (expr != null && expr.Prefixes == null && expr.Code == code) {
Debug.Assert(expr.Operand == null);
args = expr.Arguments;
return true;
}
args = null;
return false;
}
public static bool Match(this ILNode node, ILCode code, out ILExpression arg)
{
List<ILExpression> args;
if (node.Match(code, out args) && args.Count == 1) {
arg = args[0];
return true;
}
arg = null;
return false;
}
public static bool Match<T>(this ILNode node, ILCode code, out T operand, out List<ILExpression> args)
{
ILExpression expr = node as ILExpression;
if (expr != null && expr.Prefixes == null && expr.Code == code) {
operand = (T)expr.Operand;
args = expr.Arguments;
return true;
}
operand = default(T);
args = null;
return false;
}
public static bool Match<T>(this ILNode node, ILCode code, out T operand, out ILExpression arg)
{
List<ILExpression> args;
if (node.Match(code, out operand, out args) && args.Count == 1) {
arg = args[0];
return true;
}
arg = null;
return false;
}
public static bool Match<T>(this ILNode node, ILCode code, out T operand, out ILExpression arg1, out ILExpression arg2)
{
List<ILExpression> args;
if (node.Match(code, out operand, out args) && args.Count == 2) {
arg1 = args[0];
arg2 = args[1];
return true;
}
arg1 = null;
arg2 = null;
return false;
}
public static bool MatchSingle<T>(this ILBasicBlock bb, ILCode code, out T operand, out ILExpression arg)
{
if (bb.Body.Count == 2 &&
bb.Body[0] is ILLabel &&
bb.Body[1].Match(code, out operand, out arg))
{
return true;
}
operand = default(T);
arg = null;
return false;
}
public static bool MatchSingleAndBr<T>(this ILBasicBlock bb, ILCode code, out T operand, out ILExpression arg, out ILLabel brLabel)
{
if (bb.Body.Count == 3 &&
bb.Body[0] is ILLabel &&
bb.Body[1].Match(code, out operand, out arg) &&
bb.Body[2].Match(ILCode.Br, out brLabel))
{
return true;
}
operand = default(T);
arg = null;
brLabel = null;
return false;
}
public static bool MatchLastAndBr<T>(this ILBasicBlock bb, ILCode code, out T operand, out ILExpression arg, out ILLabel brLabel)
{
if (bb.Body.ElementAtOrDefault(bb.Body.Count - 2).Match(code, out operand, out arg) &&
bb.Body.LastOrDefault().Match(ILCode.Br, out brLabel))
{
return true;
}
operand = default(T);
arg = null;
brLabel = null;
return false;
}
public static bool MatchThis(this ILNode node)
{
ILVariable v;
return node.Match(ILCode.Ldloc, out v) && v.IsParameter && v.OriginalParameter.Index == -1;
}
public static bool MatchLdloc(this ILNode node, ILVariable expectedVar)
{
ILVariable v;
return node.Match(ILCode.Ldloc, out v) && v == expectedVar;
}
public static bool MatchLdloca(this ILNode node, ILVariable expectedVar)
{
ILVariable v;
return node.Match(ILCode.Ldloca, out v) && v == expectedVar;
}
public static bool MatchStloc(this ILNode node, ILVariable expectedVar, out ILExpression expr)
{
ILVariable v;
return node.Match(ILCode.Stloc, out v, out expr) && v == expectedVar;
}
}
}
|
