Reference type propagation

- propagate reference types between instructions
- remove checked casts when possible
- add StackHandleScopeCollection to manage an arbitrary number of stack
handles (see comments)

Change-Id: I31200067c5e7375a5ea8e2f873c4374ebdb5ee60

1 files changed, 4 insertions, 0 deletions

diff --git a/compiler/optimizing/optimizing_compiler_stats.h b/compiler/optimizing/optimizing_compiler_stats.h
index cc2723df99..3ebf0f8cd2 100644
--- a/compiler/optimizing/optimizing_compiler_stats.h
+++ b/compiler/optimizing/optimizing_compiler_stats.h
@@ -43,6 +43,8 @@ enum MethodCompilationStat {
   kNotCompiledCantAccesType,
   kNotOptimizedRegisterAllocator,
   kNotCompiledUnhandledInstruction,
+  kRemovedCheckedCast,
+  kRemovedNullCheck,
   kLastStat
 };
 
@@ -96,6 +98,8 @@ class OptimizingCompilerStats {
       case kNotCompiledCantAccesType : return "kNotCompiledCantAccesType";
       case kNotOptimizedRegisterAllocator : return "kNotOptimizedRegisterAllocator";
       case kNotCompiledUnhandledInstruction : return "kNotCompiledUnhandledInstruction";
+      case kRemovedCheckedCast: return "kRemovedCheckedCast";
+      case kRemovedNullCheck: return "kRemovedNullCheck";
       default: LOG(FATAL) << "invalid stat";
     }
     return "";