1 /*
2  * Copyright (C) 2014 The Android Open Source Project
3  *
4  * Licensed under the Apache License, Version 2.0 (the "License");
5  * you may not use this file except in compliance with the License.
6  * You may obtain a copy of the License at
7  *
8  *      http://www.apache.org/licenses/LICENSE-2.0
9  *
10  * Unless required by applicable law or agreed to in writing, software
11  * distributed under the License is distributed on an "AS IS" BASIS,
12  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13  * See the License for the specific language governing permissions and
14  * limitations under the License.
15  */
16 
17 #ifndef ART_RUNTIME_GC_ALLOCATOR_TYPE_H_
18 #define ART_RUNTIME_GC_ALLOCATOR_TYPE_H_
19 
20 #include <iosfwd>
21 
22 namespace art {
23 namespace gc {
24 
25 // Different types of allocators.
26 // Those marked with * have fast path entrypoints callable from generated code.
27 enum AllocatorType : char {
28   // BumpPointer spaces are currently only used for ZygoteSpace construction.
29   kAllocatorTypeBumpPointer,  // Use global CAS-based BumpPointer allocator. (*)
30   kAllocatorTypeTLAB,  // Use TLAB allocator within BumpPointer space. (*)
31   kAllocatorTypeRosAlloc,  // Use RosAlloc (segregated size, free list) allocator. (*)
32   kAllocatorTypeDlMalloc,  // Use dlmalloc (well-known C malloc) allocator. (*)
33   kAllocatorTypeNonMoving,  // Special allocator for non moving objects.
34   kAllocatorTypeLOS,  // Large object space.
35   // The following differ from the BumpPointer allocators primarily in that memory is
36   // allocated from multiple regions, instead of a single contiguous space.
37   kAllocatorTypeRegion,  // Use CAS-based contiguous bump-pointer allocation within a region. (*)
38   kAllocatorTypeRegionTLAB,  // Use region pieces as TLABs. Default for most small objects. (*)
39 };
40 std::ostream& operator<<(std::ostream& os, const AllocatorType& rhs);
41 
IsTLABAllocator(AllocatorType allocator)42 inline constexpr bool IsTLABAllocator(AllocatorType allocator) {
43   return allocator == kAllocatorTypeTLAB || allocator == kAllocatorTypeRegionTLAB;
44 }
45 
46 }  // namespace gc
47 }  // namespace art
48 
49 #endif  // ART_RUNTIME_GC_ALLOCATOR_TYPE_H_
50