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
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
|
//===----- ABI.h - ABI related declarations ---------------------*- C++ -*-===//
//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
//===----------------------------------------------------------------------===//
///
/// \file
/// Enums/classes describing ABI related information about constructors,
/// destructors and thunks.
///
//===----------------------------------------------------------------------===//
#ifndef LLVM_CLANG_BASIC_ABI_H
#define LLVM_CLANG_BASIC_ABI_H
#include "llvm/Support/DataTypes.h"
#include <cstring>
namespace clang {
/// C++ constructor types.
enum CXXCtorType {
Ctor_Complete, ///< Complete object ctor
Ctor_Base, ///< Base object ctor
Ctor_Comdat, ///< The COMDAT used for ctors
Ctor_CopyingClosure, ///< Copying closure variant of a ctor
Ctor_DefaultClosure, ///< Default closure variant of a ctor
};
/// C++ destructor types.
enum CXXDtorType {
Dtor_Deleting, ///< Deleting dtor
Dtor_Complete, ///< Complete object dtor
Dtor_Base, ///< Base object dtor
Dtor_Comdat ///< The COMDAT used for dtors
};
/// A return adjustment.
struct ReturnAdjustment {
/// The non-virtual adjustment from the derived object to its
/// nearest virtual base.
int64_t NonVirtual;
/// Holds the ABI-specific information about the virtual return
/// adjustment, if needed.
union VirtualAdjustment {
// Itanium ABI
struct {
/// The offset (in bytes), relative to the address point
/// of the virtual base class offset.
int64_t VBaseOffsetOffset;
} Itanium;
// Microsoft ABI
struct {
/// The offset (in bytes) of the vbptr, relative to the beginning
/// of the derived class.
uint32_t VBPtrOffset;
/// Index of the virtual base in the vbtable.
uint32_t VBIndex;
} Microsoft;
VirtualAdjustment() {
memset(this, 0, sizeof(*this));
}
bool Equals(const VirtualAdjustment &Other) const {
return memcmp(this, &Other, sizeof(Other)) == 0;
}
bool isEmpty() const {
VirtualAdjustment Zero;
return Equals(Zero);
}
bool Less(const VirtualAdjustment &RHS) const {
return memcmp(this, &RHS, sizeof(RHS)) < 0;
}
} Virtual;
ReturnAdjustment() : NonVirtual(0) {}
bool isEmpty() const { return !NonVirtual && Virtual.isEmpty(); }
friend bool operator==(const ReturnAdjustment &LHS,
const ReturnAdjustment &RHS) {
return LHS.NonVirtual == RHS.NonVirtual && LHS.Virtual.Equals(RHS.Virtual);
}
friend bool operator!=(const ReturnAdjustment &LHS, const ReturnAdjustment &RHS) {
return !(LHS == RHS);
}
friend bool operator<(const ReturnAdjustment &LHS,
const ReturnAdjustment &RHS) {
if (LHS.NonVirtual < RHS.NonVirtual)
return true;
return LHS.NonVirtual == RHS.NonVirtual && LHS.Virtual.Less(RHS.Virtual);
}
};
/// A \c this pointer adjustment.
struct ThisAdjustment {
/// The non-virtual adjustment from the derived object to its
/// nearest virtual base.
int64_t NonVirtual;
/// Holds the ABI-specific information about the virtual this
/// adjustment, if needed.
union VirtualAdjustment {
// Itanium ABI
struct {
/// The offset (in bytes), relative to the address point,
/// of the virtual call offset.
int64_t VCallOffsetOffset;
} Itanium;
struct {
/// The offset of the vtordisp (in bytes), relative to the ECX.
int32_t VtordispOffset;
/// The offset of the vbptr of the derived class (in bytes),
/// relative to the ECX after vtordisp adjustment.
int32_t VBPtrOffset;
/// The offset (in bytes) of the vbase offset in the vbtable.
int32_t VBOffsetOffset;
} Microsoft;
VirtualAdjustment() {
memset(this, 0, sizeof(*this));
}
bool Equals(const VirtualAdjustment &Other) const {
return memcmp(this, &Other, sizeof(Other)) == 0;
}
bool isEmpty() const {
VirtualAdjustment Zero;
return Equals(Zero);
}
bool Less(const VirtualAdjustment &RHS) const {
return memcmp(this, &RHS, sizeof(RHS)) < 0;
}
} Virtual;
ThisAdjustment() : NonVirtual(0) { }
bool isEmpty() const { return !NonVirtual && Virtual.isEmpty(); }
friend bool operator==(const ThisAdjustment &LHS,
const ThisAdjustment &RHS) {
return LHS.NonVirtual == RHS.NonVirtual && LHS.Virtual.Equals(RHS.Virtual);
}
friend bool operator!=(const ThisAdjustment &LHS, const ThisAdjustment &RHS) {
return !(LHS == RHS);
}
friend bool operator<(const ThisAdjustment &LHS,
const ThisAdjustment &RHS) {
if (LHS.NonVirtual < RHS.NonVirtual)
return true;
return LHS.NonVirtual == RHS.NonVirtual && LHS.Virtual.Less(RHS.Virtual);
}
};
class CXXMethodDecl;
/// The \c this pointer adjustment as well as an optional return
/// adjustment for a thunk.
struct ThunkInfo {
/// The \c this pointer adjustment.
ThisAdjustment This;
/// The return adjustment.
ReturnAdjustment Return;
/// Holds a pointer to the overridden method this thunk is for,
/// if needed by the ABI to distinguish different thunks with equal
/// adjustments. Otherwise, null.
/// CAUTION: In the unlikely event you need to sort ThunkInfos, consider using
/// an ABI-specific comparator.
const CXXMethodDecl *Method;
ThunkInfo() : Method(nullptr) { }
ThunkInfo(const ThisAdjustment &This, const ReturnAdjustment &Return,
const CXXMethodDecl *Method = nullptr)
: This(This), Return(Return), Method(Method) {}
friend bool operator==(const ThunkInfo &LHS, const ThunkInfo &RHS) {
return LHS.This == RHS.This && LHS.Return == RHS.Return &&
LHS.Method == RHS.Method;
}
bool isEmpty() const {
return This.isEmpty() && Return.isEmpty() && Method == nullptr;
}
};
} // end namespace clang
#endif
|
