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
|
import core.gc.registry;
import core.gc.gcinterface;
import core.stdc.stdlib;
static import core.memory;
extern (C) __gshared string[] rt_options = ["gcopt=gc:malloc"];
extern (C) pragma(crt_constructor) void register_mygc()
{
registerGCFactory("malloc", &MallocGC.initialize);
}
extern (C) void register_default_gcs()
{
// remove default GCs
}
/** Simple GC that requires any pointers passed to it's API
to point to start of the allocation.
*/
class MallocGC : GC
{
nothrow @nogc:
static GC initialize()
{
import core.stdc.string : memcpy;
__gshared align(__traits(classInstanceAlignment, MallocGC))
ubyte[__traits(classInstanceSize, MallocGC)] buf;
auto init = typeid(MallocGC).initializer();
assert(init.length == buf.length);
auto instance = cast(MallocGC) memcpy(buf.ptr, init.ptr, init.length);
instance.__ctor();
return instance;
}
this()
{
}
void Dtor()
{
}
void enable()
{
}
void disable()
{
}
void collect() nothrow
{
}
void collectNoStack() nothrow
{
}
void minimize() nothrow
{
}
uint getAttr(void* p) nothrow
{
return 0;
}
uint setAttr(void* p, uint mask) nothrow
{
return mask;
}
uint clrAttr(void* p, uint mask) nothrow
{
return mask;
}
void* malloc(size_t size, uint bits, const TypeInfo ti) nothrow
{
return sentinelAdd(.malloc(size + sentinelSize), size);
}
BlkInfo qalloc(size_t size, uint bits, const scope TypeInfo ti) nothrow
{
return BlkInfo(malloc(size, bits, ti), size);
}
void* calloc(size_t size, uint bits, const TypeInfo ti) nothrow
{
return sentinelAdd(.calloc(1, size + sentinelSize), size);
}
void* realloc(void* p, size_t size, uint bits, const TypeInfo ti) nothrow
{
return sentinelAdd(.realloc(p - sentinelSize, size + sentinelSize), size);
}
size_t extend(void* p, size_t minsize, size_t maxsize, const TypeInfo ti) nothrow
{
return 0;
}
size_t reserve(size_t size) nothrow
{
return 0;
}
void free(void* p) nothrow
{
free(p - sentinelSize);
}
void* addrOf(void* p) nothrow
{
return p;
}
size_t sizeOf(void* p) nothrow
{
return query(p).size;
}
BlkInfo query(void* p) nothrow
{
return p ? BlkInfo(p, sentinelGet(p)) : BlkInfo.init;
}
core.memory.GC.Stats stats() nothrow
{
return core.memory.GC.Stats.init;
}
core.memory.GC.ProfileStats profileStats() nothrow
{
return typeof(return).init;
}
void addRoot(void* p) nothrow @nogc
{
}
void removeRoot(void* p) nothrow @nogc
{
}
@property RootIterator rootIter() @nogc
{
return null;
}
void addRange(void* p, size_t sz, const TypeInfo ti) nothrow @nogc
{
}
void removeRange(void* p) nothrow @nogc
{
}
@property RangeIterator rangeIter() @nogc
{
return null;
}
void runFinalizers(const scope void[] segment) nothrow
{
}
bool inFinalizer() nothrow
{
return false;
}
ulong allocatedInCurrentThread() nothrow
{
return stats().allocatedInCurrentThread;
}
private:
// doesn't care for alignment
static void* sentinelAdd(void* p, size_t value)
{
*cast(size_t*) p = value;
return p + sentinelSize;
}
static size_t sentinelGet(void* p)
{
return *cast(size_t*)(p - sentinelSize);
}
enum sentinelSize = size_t.sizeof;
}
void main()
{
// test array append cache
char[] s;
foreach (char c; char.min .. char.max + 1)
s ~= c;
}
|
