--verify-predictable mode added for ensuring that GC behaves deterministically.

src/heap.cc

Index: src/heap.cc
diff --git a/src/heap.cc b/src/heap.cc
index 2271ae875585b7d4c1493cc66cb463013a3ad5a1..f89191a6c29d6bd253134b0cc871caaaacd2479b 100644
--- a/src/heap.cc
+++ b/src/heap.cc
@@ -79,6 +79,9 @@ Heap::Heap()
       lo_space_(NULL),
       gc_state_(NOT_IN_GC),
       gc_post_processing_depth_(0),
+      allocations_count_(0),
+      raw_allocations_hash_(0),
+      dump_allocations_hash_countdown_(FLAG_dump_allocations_digest_at_alloc),
       ms_count_(0),
       gc_count_(0),
       remembered_unmapped_pages_index_(0),
@@ -3338,8 +3341,7 @@ AllocationResult Heap::AllocateFixedTypedArray(int length,
 }
 
 
-AllocationResult Heap::AllocateCode(int object_size,
-                                bool immovable) {
+AllocationResult Heap::AllocateCode(int object_size, bool immovable) {
   ASSERT(IsAligned(static_cast<intptr_t>(object_size), kCodeAlignment));
   AllocationResult allocation;
   // Large code objects and code objects which should stay at a fixed address
@@ -5317,6 +5319,10 @@ void Heap::TearDown() {
     PrintF("\n\n");
   }
 
+  if (FLAG_allocations_digest) {
+    PrintAlloctionsHash();
+  }
+
   TearDownArrayBuffers();
 
   isolate_->global_handles()->TearDown();