blob: f60307870ffcc6bec9b297ff5397117ce894739e (
plain)
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
|
//===--- Block.cpp - Allocated blocks for the interpreter -------*- 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
//
//===----------------------------------------------------------------------===//
//
// Defines the classes describing allocated blocks.
//
//===----------------------------------------------------------------------===//
#include "InterpBlock.h"
#include "Pointer.h"
using namespace clang;
using namespace clang::interp;
void Block::addPointer(Pointer *P) {
assert(P);
if (IsStatic) {
assert(!Pointers);
return;
}
#ifndef NDEBUG
assert(!hasPointer(P));
#endif
if (Pointers)
Pointers->Prev = P;
P->Next = Pointers;
P->Prev = nullptr;
Pointers = P;
#ifndef NDEBUG
assert(hasPointer(P));
#endif
}
void Block::removePointer(Pointer *P) {
assert(P->isBlockPointer());
assert(P);
if (IsStatic) {
assert(!Pointers);
return;
}
#ifndef NDEBUG
assert(hasPointer(P));
#endif
if (Pointers == P)
Pointers = P->Next;
if (P->Prev)
P->Prev->Next = P->Next;
if (P->Next)
P->Next->Prev = P->Prev;
P->PointeeStorage.BS.Pointee = nullptr;
#ifndef NDEBUG
assert(!hasPointer(P));
#endif
}
void Block::cleanup() {
if (Pointers == nullptr && IsDead)
(reinterpret_cast<DeadBlock *>(this + 1) - 1)->free();
}
void Block::replacePointer(Pointer *Old, Pointer *New) {
assert(Old);
assert(New);
assert(Old != New);
if (IsStatic) {
assert(!Pointers);
return;
}
#ifndef NDEBUG
assert(hasPointer(Old));
#endif
if (Old->Prev)
Old->Prev->Next = New;
if (Old->Next)
Old->Next->Prev = New;
New->Prev = Old->Prev;
New->Next = Old->Next;
if (Pointers == Old)
Pointers = New;
Old->PointeeStorage.BS.Pointee = nullptr;
New->PointeeStorage.BS.Pointee = this;
#ifndef NDEBUG
assert(!hasPointer(Old));
assert(hasPointer(New));
#endif
}
#ifndef NDEBUG
bool Block::hasPointer(const Pointer *P) const {
for (const Pointer *C = Pointers; C; C = C->Next) {
if (C == P)
return true;
}
return false;
}
#endif
DeadBlock::DeadBlock(DeadBlock *&Root, Block *Blk)
: Root(Root), B(~0u, Blk->Desc, Blk->IsStatic, Blk->IsExtern, Blk->IsWeak,
/*isDead=*/true) {
// Add the block to the chain of dead blocks.
if (Root)
Root->Prev = this;
Next = Root;
Prev = nullptr;
Root = this;
B.IsDynamic = Blk->IsDynamic;
// Transfer pointers.
B.Pointers = Blk->Pointers;
for (Pointer *P = Blk->Pointers; P; P = P->Next)
P->PointeeStorage.BS.Pointee = &B;
Blk->Pointers = nullptr;
}
void DeadBlock::free() {
if (B.IsInitialized)
B.invokeDtor();
if (Prev)
Prev->Next = Next;
if (Next)
Next->Prev = Prev;
if (Root == this)
Root = Next;
std::free(this);
}
|
