-
Notifications
You must be signed in to change notification settings - Fork 466
/
OpCodeUtil.cs
180 lines (169 loc) · 4.65 KB
/
OpCodeUtil.cs
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
172
173
174
175
176
177
178
179
180
// Copyright 2004-2021 Castle Project - http://www.castleproject.org/
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
namespace Castle.DynamicProxy.Generators.Emitters
{
using System;
using System.Reflection;
using System.Reflection.Emit;
internal abstract class OpCodeUtil
{
/// <summary>
/// Emits a load indirect opcode of the appropriate type for a value or object reference.
/// Pops a pointer off the evaluation stack, dereferences it and loads
/// a value of the specified type.
/// </summary>
public static void EmitLoadIndirectOpCodeForType(ILGenerator gen, Type type)
{
if (type.IsByRef)
{
throw new NotSupportedException("Cannot load ByRef values");
}
else if (type.IsPrimitive && type != typeof(IntPtr) && type != typeof(UIntPtr))
{
var opCode = LdindOpCodesDictionary.Instance[type];
if (opCode == LdindOpCodesDictionary.EmptyOpCode)
{
throw new ArgumentException("Type " + type + " could not be converted to a OpCode");
}
gen.Emit(opCode);
}
else if (type.IsGenericParameter)
{
gen.Emit(OpCodes.Ldobj, type);
}
else if (type.IsValueType)
{
if (type.IsEnum)
{
EmitLoadIndirectOpCodeForType(gen, GetUnderlyingTypeOfEnum(type));
}
else
{
gen.Emit(OpCodes.Ldobj, type);
}
}
else
{
gen.Emit(OpCodes.Ldind_Ref);
}
}
/// <summary>
/// Emits a load opcode of the appropriate kind for the constant default value of a
/// type, such as 0 for value types and null for reference types.
/// </summary>
public static void EmitLoadOpCodeForDefaultValueOfType(ILGenerator gen, Type type)
{
if (type.IsPrimitive)
{
var opCode = LdcOpCodesDictionary.Instance[type];
switch (opCode.StackBehaviourPush)
{
case StackBehaviour.Pushi:
gen.Emit(opCode, 0);
if (Is64BitTypeLoadedAsInt32(type))
{
// we load Int32, and have to convert it to 64bit type
gen.Emit(OpCodes.Conv_I8);
}
break;
case StackBehaviour.Pushr8:
gen.Emit(opCode, 0D);
break;
case StackBehaviour.Pushi8:
gen.Emit(opCode, 0L);
break;
case StackBehaviour.Pushr4:
gen.Emit(opCode, 0F);
break;
default:
throw new NotSupportedException();
}
}
else
{
gen.Emit(OpCodes.Ldnull);
}
}
/// <summary>
/// Emits a store indirectopcode of the appropriate type for a value or object reference.
/// Pops a value of the specified type and a pointer off the evaluation stack, and
/// stores the value.
/// </summary>
public static void EmitStoreIndirectOpCodeForType(ILGenerator gen, Type type)
{
if (type.IsByRef)
{
throw new NotSupportedException("Cannot store ByRef values");
}
else if (type.IsPrimitive && type != typeof(IntPtr) && type != typeof(UIntPtr))
{
var opCode = StindOpCodesDictionary.Instance[type];
if (Equals(opCode, StindOpCodesDictionary.EmptyOpCode))
{
throw new ArgumentException("Type " + type + " could not be converted to a OpCode");
}
gen.Emit(opCode);
}
else if (type.IsGenericParameter)
{
gen.Emit(OpCodes.Stobj, type);
}
else if (type.IsValueType)
{
if (type.IsEnum)
{
EmitStoreIndirectOpCodeForType(gen, GetUnderlyingTypeOfEnum(type));
}
else
{
gen.Emit(OpCodes.Stobj, type);
}
}
else
{
gen.Emit(OpCodes.Stind_Ref);
}
}
private static Type GetUnderlyingTypeOfEnum(Type enumType)
{
var baseType = (IConvertible)Activator.CreateInstance(enumType);
var code = baseType.GetTypeCode();
switch (code)
{
case TypeCode.SByte:
return typeof(SByte);
case TypeCode.Byte:
return typeof(Byte);
case TypeCode.Int16:
return typeof(Int16);
case TypeCode.Int32:
return typeof(Int32);
case TypeCode.Int64:
return typeof(Int64);
case TypeCode.UInt16:
return typeof(UInt16);
case TypeCode.UInt32:
return typeof(UInt32);
case TypeCode.UInt64:
return typeof(UInt64);
default:
throw new NotSupportedException();
}
}
private static bool Is64BitTypeLoadedAsInt32(Type type)
{
return type == typeof(long) || type == typeof(ulong);
}
}
}