-
Notifications
You must be signed in to change notification settings - Fork 1
/
Alloc.h
141 lines (107 loc) · 4.66 KB
/
Alloc.h
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
/*****************************************************************************************[Alloc.h]
Copyright (c) 2008-2010, Niklas Sorensson
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.
**************************************************************************************************/
#ifndef Glucose_Alloc_h
#define Glucose_Alloc_h
#include "mtl/XAlloc.h"
#include "mtl/Vec.h"
namespace Glucose {
//=================================================================================================
// Simple Region-based memory allocator:
template<class T>
class RegionAllocator
{
T* memory;
uint32_t sz;
uint32_t cap;
uint32_t wasted_;
void capacity(uint32_t min_cap);
public:
// TODO: make this a class for better type-checking?
typedef uint32_t Ref;
enum { Ref_Undef = UINT32_MAX };
enum { Unit_Size = sizeof(uint32_t) };
explicit RegionAllocator(uint32_t start_cap = 1024*1024) : memory(NULL), sz(0), cap(0), wasted_(0){ capacity(start_cap); }
~RegionAllocator()
{
if (memory != NULL)
::free(memory);
}
uint32_t size () const { return sz; }
uint32_t getCap () const { return cap;}
uint32_t wasted () const { return wasted_; }
Ref alloc (int size);
void free (int size) { wasted_ += size; }
// Deref, Load Effective Address (LEA), Inverse of LEA (AEL):
T& operator[](Ref r) { assert(r >= 0 && r < sz); return memory[r]; }
const T& operator[](Ref r) const { assert(r >= 0 && r < sz); return memory[r]; }
T* lea (Ref r) { assert(r >= 0 && r < sz); return &memory[r]; }
const T* lea (Ref r) const { assert(r >= 0 && r < sz); return &memory[r]; }
Ref ael (const T* t) { assert((void*)t >= (void*)&memory[0] && (void*)t < (void*)&memory[sz-1]);
return (Ref)(t - &memory[0]); }
void moveTo(RegionAllocator& to) {
if (to.memory != NULL) ::free(to.memory);
to.memory = memory;
to.sz = sz;
to.cap = cap;
to.wasted_ = wasted_;
memory = NULL;
sz = cap = wasted_ = 0;
}
void copyTo(RegionAllocator& to) const {
// if (to.memory != NULL) ::free(to.memory);
to.memory = (T*)xrealloc(to.memory, sizeof(T)*cap);
memcpy(to.memory,memory,sizeof(T)*cap);
to.sz = sz;
to.cap = cap;
to.wasted_ = wasted_;
}
};
template<class T>
void RegionAllocator<T>::capacity(uint32_t min_cap)
{
if (cap >= min_cap) return;
uint32_t prev_cap = cap;
while (cap < min_cap){
// NOTE: Multiply by a factor (13/8) without causing overflow, then add 2 and make the
// result even by clearing the least significant bit. The resulting sequence of capacities
// is carefully chosen to hit a maximum capacity that is close to the '2^32-1' limit when
// using 'uint32_t' as indices so that as much as possible of this space can be used.
uint32_t delta = ((cap >> 1) + (cap >> 3) + 2) & ~1;
cap += delta;
if (cap <= prev_cap)
throw OutOfMemoryException();
}
//printf(" .. (%p) cap = %u\n", this, cap);
assert(cap > 0);
memory = (T*)xrealloc(memory, sizeof(T)*cap);
}
template<class T>
typename RegionAllocator<T>::Ref
RegionAllocator<T>::alloc(int size)
{
//printf("ALLOC called (this = %p, size = %d)\n", this, size); fflush(stdout);
assert(size > 0);
capacity(sz + size);
uint32_t prev_sz = sz;
sz += size;
// Handle overflow:
if (sz < prev_sz)
throw OutOfMemoryException();
return prev_sz;
}
//=================================================================================================
}
#endif