[inspector] cache stack frame for call sites

src/objects.cc

Index: src/objects.cc
diff --git a/src/objects.cc b/src/objects.cc
index db419b0c04b77b5ba4d80c4dba66da83fa30a4bb..9fd725cf408a45e1c5c6e045b2434a488426034c 100644
--- a/src/objects.cc
+++ b/src/objects.cc
@@ -2199,6 +2199,24 @@ Object* GetSimpleHash(Object* object) {
     uint32_t hash = Oddball::cast(object)->to_string()->Hash();
     return Smi::FromInt(hash);
   }
+  if (object->IsByteArray()) {
+    ByteArray* array = ByteArray::cast(object);
+    int size = array->Size();
+    uint32_t hash = kZeroHashSeed;
+    uint32_t* data = reinterpret_cast<uint32_t*>(array->GetDataStartAddress());
+    for (int i = 0; i < size / 4; i += 4) {

[Yang, 2017/04/04 21:15:18]

Do we really need to hash the entire byte array? First and last word hashed
together sounds sufficient to me.

[kozy, 2017/04/04 23:08:12]

Done.

+      hash = ComputeIntegerHash(hash, *data);
+      ++data;
+    }
+    int tail_start = size - size % 4;
+    uint32_t tail = 0;
+    for (int i = tail_start; i < size; ++i) {
+      tail |= array->get(i);
+      tail <<= 8;
+    }
+    hash = ComputeIntegerHash(hash, tail);
+    return Smi::FromInt(hash);
+  }
   DCHECK(object->IsJSReceiver());
   // Simply return the receiver as it is guaranteed to not be a SMI.
   return object;