Track representations of fields

src/arm/stub-cache-arm.cc

 // Copyright 2012 the V8 project authors. All rights reserved.
 // Redistribution and use in source and binary forms, with or without
 // modification, are permitted provided that the following conditions are
 // met:
 //
 //     * Redistributions of source code must retain the above copyright
 //       notice, this list of conditions and the following disclaimer.
 //     * Redistributions in binary form must reproduce the above
 //       copyright notice, this list of conditions and the following
 //       disclaimer in the documentation and/or other materials provided
@@ skipping 2879 matching lines @@
   __ Ret();
 
   // Return the generated code.
   return GetICCode(kind(), Code::NORMAL, name);
 }
 
 
 Handle<Code> BaseLoadStubCompiler::CompilePolymorphicIC(
     MapHandleList* receiver_maps,
     CodeHandleList* handlers,
+    int number_of_valid_maps,
     Handle<Name> name,
     Code::StubType type,
     IcCheckType check) {
   Label miss;
 
   if (check == PROPERTY) {
     GenerateNameCheck(name, this->name(), &miss);
   }
 
   __ JumpIfSmi(receiver(), &miss);
   Register map_reg = scratch1();
 
   int receiver_count = receiver_maps->length();
   __ ldr(map_reg, FieldMemOperand(receiver(), HeapObject::kMapOffset));
   for (int current = 0; current < receiver_count; ++current) {
-    __ mov(ip, Operand(receiver_maps->at(current)));
-    __ cmp(map_reg, ip);
-    __ Jump(handlers->at(current), RelocInfo::CODE_TARGET, eq);
+    Handle<Map> map = receiver_maps->at(current);
+    if (!map->is_invalid_transition()) {
+      __ mov(ip, Operand(receiver_maps->at(current)));
+      __ cmp(map_reg, ip);
+      __ Jump(handlers->at(current), RelocInfo::CODE_TARGET, eq);
+    }
   }
 
   __ bind(&miss);
   TailCallBuiltin(masm(), MissBuiltin(kind()));
 
   // Return the generated code.
-  InlineCacheState state =
-      receiver_maps->length() > 1 ? POLYMORPHIC : MONOMORPHIC;
+  InlineCacheState state = number_of_valid_maps > 1 ? POLYMORPHIC : MONOMORPHIC;
   return GetICCode(kind(), type, name, state);
 }
 
 
 Handle<Code> KeyedStoreStubCompiler::CompileStorePolymorphic(
     MapHandleList* receiver_maps,
     CodeHandleList* handler_stubs,
     MapHandleList* transitioned_maps) {
   Label miss;
   __ JumpIfSmi(receiver(), &miss);
@@ skipping 748 matching lines @@
     TailCallBuiltin(masm, Builtins::kKeyedStoreIC_Slow);
   }
 }
 
 
 #undef __
 
 } }  // namespace v8::internal
 
 #endif  // V8_TARGET_ARCH_ARM