Add MEGAMORPHIC state support for KeyedStoreIC

src/ic/arm/ic-arm.cc

Index: src/ic/arm/ic-arm.cc
diff --git a/src/ic/arm/ic-arm.cc b/src/ic/arm/ic-arm.cc
index ae13161501fd29b6ffa679636fbb8d44660f18b4..d26dc491eb930d6e2aaec6d339ac6b3d13cc7312 100644
--- a/src/ic/arm/ic-arm.cc
+++ b/src/ic/arm/ic-arm.cc
@@ -765,8 +765,9 @@ static void KeyedStoreGenerateGenericHelper(
 }
 
 
-void KeyedStoreIC::GenerateGeneric(MacroAssembler* masm,
-                                   StrictMode strict_mode) {
+void KeyedStoreIC::GenerateGeneric(
+    MacroAssembler* masm, StrictMode strict_mode,
+    KeyedStoreStubCacheRequirement handler_requirement) {
   // ---------- S t a t e --------------
   //  -- r0     : value
   //  -- r1     : key
@@ -775,7 +776,7 @@ void KeyedStoreIC::GenerateGeneric(MacroAssembler* masm,
   // -----------------------------------
   Label slow, fast_object, fast_object_grow;
   Label fast_double, fast_double_grow;
-  Label array, extra, check_if_double_array;
+  Label array, extra, check_if_double_array, maybe_name_key, miss;
 
   // Register usage.
   Register value = StoreDescriptor::ValueRegister();
@@ -790,7 +791,7 @@ void KeyedStoreIC::GenerateGeneric(MacroAssembler* masm,
   // r4 and r5 are used as general scratch registers.
 
   // Check that the key is a smi.
-  __ JumpIfNotSmi(key, &slow);
+  __ JumpIfNotSmi(key, &maybe_name_key);
   // Check that the object isn't a smi.
   __ JumpIfSmi(receiver, &slow);
   // Get the map of the object.
@@ -822,6 +823,23 @@ void KeyedStoreIC::GenerateGeneric(MacroAssembler* masm,
   // r1: key.
   // r2: receiver.
   PropertyICCompiler::GenerateRuntimeSetProperty(masm, strict_mode);
+  // Never returns to here.
+
+  __ bind(&maybe_name_key);
+  __ ldr(r4, FieldMemOperand(key, HeapObject::kMapOffset));
+  __ ldrb(r4, FieldMemOperand(r4, Map::kInstanceTypeOffset));
+  __ JumpIfNotUniqueNameInstanceType(r4, &slow);
+  Code::Flags flags = Code::RemoveTypeAndHolderFromFlags(
+      Code::ComputeHandlerFlags(Code::STORE_IC));
+  masm->isolate()->stub_cache()->GenerateProbe(masm, flags, false, receiver,
+                                               key, r3, r4, r5, r6);
+  // Cache miss.
+  if (handler_requirement == kCallRuntimeOnMissingHandler) {
+    __ b(&slow);
+  } else {
+    DCHECK(handler_requirement == kMissOnMissingHandler);
+    __ b(&miss);
+  }
 
   // Extra capacity case: Check if there is extra capacity to
   // perform the store and update the length. Used for adding one
@@ -863,6 +881,9 @@ void KeyedStoreIC::GenerateGeneric(MacroAssembler* masm,
                                   &slow, kDontCheckMap, kIncrementLength, value,
                                   key, receiver, receiver_map, elements_map,
                                   elements);
+
+  __ bind(&miss);
+  GenerateMiss(masm);
 }