Create a scoped arena allocator and use that for LVN.
This saves more than 0.5s of boot.oat compilation time
on Nexus 5.
TODO: Move other stuff to the scoped allocator. This CL
alone increases the peak memory allocation. By reusing
the memory for other parts of the compilation we should
reduce this overhead.
Change-Id: Ifbc00aab4f3afd0000da818dfe68b96713824a08
diff --git a/compiler/dex/compiler_ir.h b/compiler/dex/compiler_ir.h
index ee88041..c71f047 100644
--- a/compiler/dex/compiler_ir.h
+++ b/compiler/dex/compiler_ir.h
@@ -25,6 +25,7 @@
#include "driver/compiler_driver.h"
#include "driver/dex_compilation_unit.h"
#include "safe_map.h"
+#include "utils/scoped_arena_allocator.h"
#include "base/timing_logger.h"
#include "utils/arena_allocator.h"
@@ -82,6 +83,7 @@
// TODO: move memory management to mir_graph, or just switch to using standard containers.
ArenaAllocator arena;
+ ArenaStack arena_stack; // Arenas for ScopedArenaAllocator.
UniquePtr<MIRGraph> mir_graph; // MIR container.
UniquePtr<Backend> cg; // Target-specific codegen.