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
|
/* libs/pixelflinger/codeflinger/CodeCache.cpp
**
** Copyright 2006, The Android Open Source Project
**
** 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.
*/
#include <assert.h>
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <sys/mman.h>
#include <cutils/log.h>
#include <cutils/atomic.h>
#include "codeflinger/CodeCache.h"
namespace android {
// ----------------------------------------------------------------------------
#if defined(__arm__)
#include <unistd.h>
#include <errno.h>
#endif
// ----------------------------------------------------------------------------
Assembly::Assembly(size_t size)
: mCount(1), mSize(0)
{
mBase = (uint32_t*)mspace_malloc(getMspace(), size);
mSize = size;
ensureMbaseExecutable();
}
Assembly::~Assembly()
{
mspace_free(getMspace(), mBase);
}
void Assembly::incStrong(const void*) const
{
android_atomic_inc(&mCount);
}
void Assembly::decStrong(const void*) const
{
if (android_atomic_dec(&mCount) == 1) {
delete this;
}
}
ssize_t Assembly::size() const
{
if (!mBase) return NO_MEMORY;
return mSize;
}
uint32_t* Assembly::base() const
{
return mBase;
}
ssize_t Assembly::resize(size_t newSize)
{
mBase = (uint32_t*)mspace_realloc(getMspace(), mBase, newSize);
mSize = newSize;
ensureMbaseExecutable();
return size();
}
mspace Assembly::getMspace()
{
static mspace msp = create_contiguous_mspace(2 * 1024, 1024 * 1024, /*locked=*/ false);
return msp;
}
void Assembly::ensureMbaseExecutable()
{
long pagesize = sysconf(_SC_PAGESIZE);
long pagemask = ~(pagesize - 1); // assumes pagesize is a power of 2
uint32_t* pageStart = (uint32_t*) (((uintptr_t) mBase) & pagemask);
size_t adjustedLength = (mBase - pageStart) * sizeof(uint32_t) + mSize;
if (mBase && mprotect(pageStart, adjustedLength, PROT_READ | PROT_WRITE | PROT_EXEC) != 0) {
mspace_free(getMspace(), mBase);
mBase = NULL;
}
}
// ----------------------------------------------------------------------------
CodeCache::CodeCache(size_t size)
: mCacheSize(size), mCacheInUse(0)
{
pthread_mutex_init(&mLock, 0);
}
CodeCache::~CodeCache()
{
pthread_mutex_destroy(&mLock);
}
sp<Assembly> CodeCache::lookup(const AssemblyKeyBase& keyBase) const
{
pthread_mutex_lock(&mLock);
sp<Assembly> r;
ssize_t index = mCacheData.indexOfKey(key_t(keyBase));
if (index >= 0) {
const cache_entry_t& e = mCacheData.valueAt(index);
e.when = mWhen++;
r = e.entry;
}
pthread_mutex_unlock(&mLock);
return r;
}
int CodeCache::cache( const AssemblyKeyBase& keyBase,
const sp<Assembly>& assembly)
{
pthread_mutex_lock(&mLock);
const ssize_t assemblySize = assembly->size();
while (mCacheInUse + assemblySize > mCacheSize) {
// evict the LRU
size_t lru = 0;
size_t count = mCacheData.size();
for (size_t i=0 ; i<count ; i++) {
const cache_entry_t& e = mCacheData.valueAt(i);
if (e.when < mCacheData.valueAt(lru).when) {
lru = i;
}
}
const cache_entry_t& e = mCacheData.valueAt(lru);
mCacheInUse -= e.entry->size();
mCacheData.removeItemsAt(lru);
}
ssize_t err = mCacheData.add(key_t(keyBase), cache_entry_t(assembly, mWhen));
if (err >= 0) {
mCacheInUse += assemblySize;
mWhen++;
// synchronize caches...
#if defined(__arm__)
const long base = long(assembly->base());
const long curr = base + long(assembly->size());
err = cacheflush(base, curr, 0);
LOGE_IF(err, "__ARM_NR_cacheflush error %s\n",
strerror(errno));
#endif
}
pthread_mutex_unlock(&mLock);
return err;
}
// ----------------------------------------------------------------------------
}; // namespace android
|
