diff options
Diffstat (limited to 'linker/linker_block_allocator.h')
| -rw-r--r-- | linker/linker_block_allocator.h | 24 |
1 files changed, 17 insertions, 7 deletions
diff --git a/linker/linker_block_allocator.h b/linker/linker_block_allocator.h index 1d41806..4b9b995 100644 --- a/linker/linker_block_allocator.h +++ b/linker/linker_block_allocator.h @@ -14,8 +14,8 @@ * limitations under the License. */ -#ifndef __LINKER_ALLOCATOR_H -#define __LINKER_ALLOCATOR_H +#ifndef __LINKER_BLOCK_ALLOCATOR_H +#define __LINKER_BLOCK_ALLOCATOR_H #include <stdlib.h> #include <limits.h> @@ -24,11 +24,11 @@ struct LinkerBlockAllocatorPage; /* - * This class is a non-template version of the LinkerAllocator + * This class is a non-template version of the LinkerTypeAllocator * It keeps code inside .cpp file by keeping the interface * template-free. * - * Please use LinkerAllocator<type> where possible (everywhere). + * Please use LinkerTypeAllocator<type> where possible (everywhere). */ class LinkerBlockAllocator { public: @@ -50,11 +50,21 @@ class LinkerBlockAllocator { }; /* - * We can't use malloc(3) in the dynamic linker. - * * A simple allocator for the dynamic linker. An allocator allocates instances * of a single fixed-size type. Allocations are backed by page-sized private * anonymous mmaps. + * + * The differences between this allocator and LinkerMemoryAllocator are: + * 1. This allocator manages space more efficiently. LinkerMemoryAllocator + * operates in power-of-two sized blocks up to 1k, when this implementation + * splits the page to aligned size of structure; For example for structures + * with size 513 this allocator will use 516 (520 for lp64) bytes of data + * where generalized implementation is going to use 1024 sized blocks. + * + * 2. This allocator does not munmap allocated memory, where LinkerMemoryAllocator does. + * + * 3. This allocator provides mprotect services to the user, where LinkerMemoryAllocator + * always treats it's memory as READ|WRITE. */ template<typename T> class LinkerTypeAllocator { @@ -68,4 +78,4 @@ class LinkerTypeAllocator { DISALLOW_COPY_AND_ASSIGN(LinkerTypeAllocator); }; -#endif // __LINKER_ALLOCATOR_H +#endif // __LINKER_BLOCK_ALLOCATOR_H |