Write out image bitmap inside of image file.
We now create the image bitmap when we generate the image. The image
bitmap is written after the image inside of the image file. This
speeds up dex2oat by making walking the image during heap creation
unnecessary. This should also help memory pressure by enabling the
image bitmap to be swappable.
Bug: 10432288
Change-Id: Idebf459ed15edbb41a7d9b9b353934155bce2f19
diff --git a/runtime/gc/accounting/space_bitmap.h b/runtime/gc/accounting/space_bitmap.h
index 26ab1de..f975692 100644
--- a/runtime/gc/accounting/space_bitmap.h
+++ b/runtime/gc/accounting/space_bitmap.h
@@ -48,10 +48,16 @@
typedef void SweepCallback(size_t ptr_count, mirror::Object** ptrs, void* arg);
- // Initialize a HeapBitmap so that it points to a bitmap large enough to cover a heap at
+ // Initialize a space bitmap so that it points to a bitmap large enough to cover a heap at
// heap_begin of heap_capacity bytes, where objects are guaranteed to be kAlignment-aligned.
static SpaceBitmap* Create(const std::string& name, byte* heap_begin, size_t heap_capacity);
+ // Initialize a space bitmap using the provided mem_map as the live bits. Takes ownership of the
+ // mem map. The address range covered starts at heap_begin and is of size equal to heap_capacity.
+ // Objects are kAlignement-aligned.
+ static SpaceBitmap* CreateFromMemMap(const std::string& name, MemMap* mem_map,
+ byte* heap_begin, size_t heap_capacity);
+
~SpaceBitmap();
// <offset> is the difference from .base to a pointer address.