Use Type in CheckPrototypes.

src/x64/stub-cache-x64.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 627 matching lines @@
     if (can_do_fast_api_call) {
       __ IncrementCounter(counters->call_const_interceptor_fast_api(), 1);
       ReserveSpaceForFastApiCall(masm, scratch1);
     }
 
     // Check that the maps from receiver to interceptor's holder
     // haven't changed and thus we can invoke interceptor.
     Label miss_cleanup;
     Label* miss = can_do_fast_api_call ? &miss_cleanup : miss_label;
     Register holder =
-        stub_compiler_->CheckPrototypes(object, receiver, interceptor_holder,
-                                        scratch1, scratch2, scratch3,
-                                        name, depth1, miss);
+        stub_compiler_->CheckPrototypes(
+            IC::CurrentTypeOf(object, masm->isolate()), receiver,
+            interceptor_holder, scratch1, scratch2, scratch3,
+            name, depth1, miss);
 
     // Invoke an interceptor and if it provides a value,
     // branch to |regular_invoke|.
     Label regular_invoke;
     LoadWithInterceptor(masm, receiver, holder, interceptor_holder,
                         &regular_invoke);
 
     // Interceptor returned nothing for this property.  Try to use cached
     // constant function.
 
     // Check that the maps from interceptor's holder to constant function's
     // holder haven't changed and thus we can use cached constant function.
     if (*interceptor_holder != lookup->holder()) {
-      stub_compiler_->CheckPrototypes(interceptor_holder, receiver,
-                                      Handle<JSObject>(lookup->holder()),
-                                      scratch1, scratch2, scratch3,
-                                      name, depth2, miss);
+      stub_compiler_->CheckPrototypes(
+          IC::CurrentTypeOf(interceptor_holder, masm->isolate()), receiver,
+          handle(lookup->holder()), scratch1, scratch2, scratch3,
+          name, depth2, miss);
     } else {
       // CheckPrototypes has a side effect of fetching a 'holder'
       // for API (object which is instanceof for the signature).  It's
       // safe to omit it here, as if present, it should be fetched
       // by the previous CheckPrototypes.
       ASSERT(depth2 == kInvalidProtoDepth);
     }
 
     // Invoke function.
     if (can_do_fast_api_call) {
@@ skipping 25 matching lines @@
   void CompileRegular(MacroAssembler* masm,
                       Handle<JSObject> object,
                       Register receiver,
                       Register scratch1,
                       Register scratch2,
                       Register scratch3,
                       Handle<Name> name,
                       Handle<JSObject> interceptor_holder,
                       Label* miss_label) {
     Register holder =
-        stub_compiler_->CheckPrototypes(object, receiver, interceptor_holder,
-                                        scratch1, scratch2, scratch3,
-                                        name, miss_label);
+        stub_compiler_->CheckPrototypes(
+            IC::CurrentTypeOf(object, masm->isolate()), receiver,
+            interceptor_holder, scratch1, scratch2, scratch3, name, miss_label);
 
     FrameScope scope(masm, StackFrame::INTERNAL);
     // Save the name_ register across the call.
     __ push(name_);
 
     PushInterceptorArguments(masm, receiver, holder, name_, interceptor_holder);
 
     __ CallExternalReference(
         ExternalReference(IC_Utility(IC::kLoadPropertyWithInterceptorForCall),
                           masm->isolate()),
@@ skipping 314 matching lines @@
           EMIT_REMEMBERED_SET, smi_check);
     }
   }
 
   // Return the value (register rax).
   ASSERT(value_reg.is(rax));
   __ ret(0);
 }
 
 
-void StubCompiler::GenerateCheckPropertyCells(MacroAssembler* masm,
-                                              Handle<JSObject> object,
-                                              Handle<JSObject> holder,
-                                              Handle<Name> name,
-                                              Register scratch,
-                                              Label* miss) {
-  Handle<JSObject> current = object;
-  while (!current.is_identical_to(holder)) {
-    if (current->IsJSGlobalObject()) {
-      GenerateCheckPropertyCell(masm,
-                                Handle<JSGlobalObject>::cast(current),
-                                name,
-                                scratch,
-                                miss);
-    }
-    current = Handle<JSObject>(JSObject::cast(current->GetPrototype()));
-  }
-}
-
-
 void StubCompiler::GenerateTailCall(MacroAssembler* masm, Handle<Code> code) {
   __ jmp(code, RelocInfo::CODE_TARGET);
 }
 
 
 #undef __
 #define __ ACCESS_MASM((masm()))
 
 
-Register StubCompiler::CheckPrototypes(Handle<JSObject> object,
+Register StubCompiler::CheckPrototypes(Handle<Type> type,
                                        Register object_reg,
                                        Handle<JSObject> holder,
                                        Register holder_reg,
                                        Register scratch1,
                                        Register scratch2,
                                        Handle<Name> name,
                                        int save_at_depth,
                                        Label* miss,
                                        PrototypeCheckType check) {
+  Handle<Map> receiver_map(IC::TypeToMap(*type, isolate()));
   // Make sure that the type feedback oracle harvests the receiver map.
   // TODO(svenpanne) Remove this hack when all ICs are reworked.
-  __ Move(scratch1, Handle<Map>(object->map()));
+  __ Move(scratch1, receiver_map);
 
-  Handle<JSObject> first = object;
   // Make sure there's no overlap between holder and object registers.
   ASSERT(!scratch1.is(object_reg) && !scratch1.is(holder_reg));
   ASSERT(!scratch2.is(object_reg) && !scratch2.is(holder_reg)
          && !scratch2.is(scratch1));
 
   // Keep track of the current object in register reg.  On the first
   // iteration, reg is an alias for object_reg, on later iterations,
   // it is an alias for holder_reg.
   Register reg = object_reg;
   int depth = 0;
 
   StackArgumentsAccessor args(rsp, kFastApiCallArguments,
                               ARGUMENTS_DONT_CONTAIN_RECEIVER);
   const int kHolderIndex = kFastApiCallArguments - 1 -
       FunctionCallbackArguments::kHolderIndex;
 
   if (save_at_depth == depth) {
     __ movq(args.GetArgumentOperand(kHolderIndex), object_reg);
   }
 
-  // Check the maps in the prototype chain.
-  // Traverse the prototype chain from the object and do map checks.
-  Handle<JSObject> current = object;
-  while (!current.is_identical_to(holder)) {
+  Handle<JSObject> current = Handle<JSObject>::null();
+  if (type->IsConstant()) current = Handle<JSObject>::cast(type->AsConstant());
+  Handle<JSObject> prototype = Handle<JSObject>::null();
+  Handle<Map> current_map = receiver_map;
+  Handle<Map> holder_map(holder->map());
+  // Traverse the prototype chain and check the maps in the prototype chain for
+  // fast and global objects or do negative lookup for normal objects.
+  while (!current_map.is_identical_to(holder_map)) {
     ++depth;
 
     // Only global objects and objects that do not require access
     // checks are allowed in stubs.
-    ASSERT(current->IsJSGlobalProxy() || !current->IsAccessCheckNeeded());
+    ASSERT(current_map->IsJSGlobalProxyMap() ||
+           !current_map->is_access_check_needed());
 
-    Handle<JSObject> prototype(JSObject::cast(current->GetPrototype()));
-    if (!current->HasFastProperties() &&
-        !current->IsJSGlobalObject() &&
-        !current->IsJSGlobalProxy()) {
+    prototype = handle(JSObject::cast(current_map->prototype()));
+    if (current_map->is_dictionary_map() &&
+        !current_map->IsJSGlobalObjectMap() &&
+        !current_map->IsJSGlobalProxyMap()) {
       if (!name->IsUniqueName()) {
         ASSERT(name->IsString());
         name = factory()->InternalizeString(Handle<String>::cast(name));
       }
-      ASSERT(current->property_dictionary()->FindEntry(*name) ==
+      ASSERT(current.is_null() ||
+             current->property_dictionary()->FindEntry(*name) ==
              NameDictionary::kNotFound);
 
       GenerateDictionaryNegativeLookup(masm(), miss, reg, name,
                                        scratch1, scratch2);
 
       __ movq(scratch1, FieldOperand(reg, HeapObject::kMapOffset));
       reg = holder_reg;  // From now on the object will be in holder_reg.
       __ movq(reg, FieldOperand(scratch1, Map::kPrototypeOffset));
     } else {
       bool in_new_space = heap()->InNewSpace(*prototype);
-      Handle<Map> current_map(current->map());
       if (in_new_space) {
         // Save the map in scratch1 for later.
         __ movq(scratch1, FieldOperand(reg, HeapObject::kMapOffset));
       }
-      if (!current.is_identical_to(first) || check == CHECK_ALL_MAPS) {
+      if (depth != 1 || check == CHECK_ALL_MAPS) {
         __ CheckMap(reg, current_map, miss, DONT_DO_SMI_CHECK);
       }
 
       // Check access rights to the global object.  This has to happen after
       // the map check so that we know that the object is actually a global
       // object.
-      if (current->IsJSGlobalProxy()) {
+      if (current_map->IsJSGlobalProxyMap()) {
         __ CheckAccessGlobalProxy(reg, scratch2, miss);
+      } else if (current_map->IsJSGlobalObjectMap()) {
+        GenerateCheckPropertyCell(
+            masm(), Handle<JSGlobalObject>::cast(current), name,
+            scratch2, miss);
       }
       reg = holder_reg;  // From now on the object will be in holder_reg.
 
       if (in_new_space) {
         // The prototype is in new space; we cannot store a reference to it
         // in the code.  Load it from the map.
         __ movq(reg, FieldOperand(scratch1, Map::kPrototypeOffset));
       } else {
         // The prototype is in old space; load it directly.
         __ Move(reg, prototype);
       }
     }
 
     if (save_at_depth == depth) {
       __ movq(args.GetArgumentOperand(kHolderIndex), reg);
     }
 
     // Go to the next object in the prototype chain.
     current = prototype;
+    current_map = handle(current->map());
   }
-  ASSERT(current.is_identical_to(holder));
 
   // Log the check depth.
   LOG(isolate(), IntEvent("check-maps-depth", depth + 1));
 
-  if (!holder.is_identical_to(first) || check == CHECK_ALL_MAPS) {
+  if (depth != 0 || check == CHECK_ALL_MAPS) {
     // Check the holder map.
-    __ CheckMap(reg, Handle<Map>(holder->map()), miss, DONT_DO_SMI_CHECK);
+    __ CheckMap(reg, current_map, miss, DONT_DO_SMI_CHECK);
   }
 
   // Perform security check for access to the global object.
-  ASSERT(current->IsJSGlobalProxy() || !current->IsAccessCheckNeeded());
-  if (current->IsJSGlobalProxy()) {
+  ASSERT(current_map->IsJSGlobalProxyMap() ||
+         !current_map->is_access_check_needed());
+  if (current_map->IsJSGlobalProxyMap()) {
     __ CheckAccessGlobalProxy(reg, scratch1, miss);
   }
 
-  // If we've skipped any global objects, it's not enough to verify that
-  // their maps haven't changed.  We also need to check that the property
-  // cell for the property is still empty.
-  GenerateCheckPropertyCells(masm(), object, holder, name, scratch1, miss);
-
   // Return the register containing the holder.
   return reg;
 }
 
 
 void LoadStubCompiler::HandlerFrontendFooter(Handle<Name> name, Label* miss) {
   if (!miss->is_unused()) {
     Label success;
     __ jmp(&success);
     __ bind(miss);
@@ skipping 284 matching lines @@
                                                    Handle<Name> name,
                                                    Label* miss) {
   ASSERT(holder->IsGlobalObject());
 
   StackArgumentsAccessor args(rsp, arguments());
   __ movq(rdx, args.GetReceiverOperand());
 
 
   // Check that the maps haven't changed.
   __ JumpIfSmi(rdx, miss);
-  CheckPrototypes(object, rdx, holder, rbx, rax, rdi, name, miss);
+  CheckPrototypes(IC::CurrentTypeOf(object, isolate()), rdx, holder,
+                  rbx, rax, rdi, name, miss);
 }
 
 
 void CallStubCompiler::GenerateLoadFunctionFromCell(
     Handle<Cell> cell,
     Handle<JSFunction> function,
     Label* miss) {
   // Get the value from the cell.
   __ Move(rdi, cell);
   __ movq(rdi, FieldOperand(rdi, Cell::kValueOffset));
@@ skipping 45 matching lines @@
 
   GenerateNameCheck(name, &miss);
 
   StackArgumentsAccessor args(rsp, arguments());
   __ movq(rdx, args.GetReceiverOperand());
 
   // Check that the receiver isn't a smi.
   __ JumpIfSmi(rdx, &miss);
 
   // Do the right check and compute the holder register.
-  Register reg = CheckPrototypes(object, rdx, holder, rbx, rax, rdi,
-                                 name, &miss);
+  Register reg = CheckPrototypes(IC::CurrentTypeOf(object, isolate()), rdx,
+                                 holder, rbx, rax, rdi, name, &miss);
 
   GenerateFastPropertyLoad(masm(), rdi, reg, index.is_inobject(holder),
                            index.translate(holder), Representation::Tagged());
 
   // Check that the function really is a function.
   __ JumpIfSmi(rdi, &miss);
   __ CmpObjectType(rdi, JS_FUNCTION_TYPE, rbx);
   __ j(not_equal, &miss);
 
   // Patch the receiver on the stack with the global proxy if
@@ skipping 31 matching lines @@
   // Check that function is still array
   const int argc = arguments().immediate();
   StackArgumentsAccessor args(rsp, argc);
   GenerateNameCheck(name, &miss);
 
   if (cell.is_null()) {
     __ movq(rdx, args.GetReceiverOperand());
 
     // Check that the receiver isn't a smi.
     __ JumpIfSmi(rdx, &miss);
-    CheckPrototypes(Handle<JSObject>::cast(object), rdx, holder, rbx, rax, rdi,
-                    name, &miss);
+    CheckPrototypes(IC::CurrentTypeOf(object, isolate()), rdx, holder,
+                    rbx, rax, rdi, name, &miss);
   } else {
     ASSERT(cell->value() == *function);
     GenerateGlobalReceiverCheck(Handle<JSObject>::cast(object), holder, name,
                                 &miss);
     GenerateLoadFunctionFromCell(cell, function, &miss);
   }
 
   Handle<AllocationSite> site = isolate()->factory()->NewAllocationSite();
   site->SetElementsKind(GetInitialFastElementsKind());
   Handle<Cell> site_feedback_cell = isolate()->factory()->NewCell(site);
@@ skipping 37 matching lines @@
   Label miss;
   GenerateNameCheck(name, &miss);
 
   const int argc = arguments().immediate();
   StackArgumentsAccessor args(rsp, argc);
   __ movq(rdx, args.GetReceiverOperand());
 
   // Check that the receiver isn't a smi.
   __ JumpIfSmi(rdx, &miss);
 
-  CheckPrototypes(Handle<JSObject>::cast(object), rdx, holder, rbx, rax, rdi,
-                  name, &miss);
+  CheckPrototypes(IC::CurrentTypeOf(object, isolate()), rdx, holder,
+                  rbx, rax, rdi, name, &miss);
 
   if (argc == 0) {
     // Noop, return the length.
     __ movq(rax, FieldOperand(rdx, JSArray::kLengthOffset));
     __ ret((argc + 1) * kPointerSize);
   } else {
     Label call_builtin;
 
     if (argc == 1) {  // Otherwise fall through to call builtin.
       Label attempt_to_grow_elements, with_write_barrier, check_double;
@@ skipping 233 matching lines @@
   Label miss, return_undefined, call_builtin;
   GenerateNameCheck(name, &miss);
 
   const int argc = arguments().immediate();
   StackArgumentsAccessor args(rsp, argc);
   __ movq(rdx, args.GetReceiverOperand());
 
   // Check that the receiver isn't a smi.
   __ JumpIfSmi(rdx, &miss);
 
-  CheckPrototypes(Handle<JSObject>::cast(object), rdx, holder, rbx, rax, rdi,
-                  name, &miss);
+  CheckPrototypes(IC::CurrentTypeOf(object, isolate()), rdx, holder,
+                  rbx, rax, rdi, name, &miss);
 
   // Get the elements array of the object.
   __ movq(rbx, FieldOperand(rdx, JSArray::kElementsOffset));
 
   // Check that the elements are in fast mode and writable.
   __ CompareRoot(FieldOperand(rbx, HeapObject::kMapOffset),
                  Heap::kFixedArrayMapRootIndex);
   __ j(not_equal, &call_builtin);
 
   // Get the array's length into rcx and calculate new length.
@@ skipping 70 matching lines @@
     index_out_of_range_label = &miss;
   }
   GenerateNameCheck(name, &name_miss);
 
   // Check that the maps starting from the prototype haven't changed.
   GenerateDirectLoadGlobalFunctionPrototype(masm(),
                                             Context::STRING_FUNCTION_INDEX,
                                             rax,
                                             &miss);
   ASSERT(!object.is_identical_to(holder));
+  Handle<Object> prototype(object->GetPrototype(isolate()), isolate());
   CheckPrototypes(
-      Handle<JSObject>(JSObject::cast(object->GetPrototype(isolate()))),
+      IC::CurrentTypeOf(prototype, isolate()),
       rax, holder, rbx, rdx, rdi, name, &miss);
 
   Register receiver = rbx;
   Register index = rdi;
   Register result = rax;
   __ movq(receiver, args.GetReceiverOperand());
   if (argc > 0) {
     __ movq(index, args.GetArgumentOperand(1));
   } else {
     __ LoadRoot(index, Heap::kUndefinedValueRootIndex);
@@ skipping 60 matching lines @@
     index_out_of_range_label = &miss;
   }
   GenerateNameCheck(name, &name_miss);
 
   // Check that the maps starting from the prototype haven't changed.
   GenerateDirectLoadGlobalFunctionPrototype(masm(),
                                             Context::STRING_FUNCTION_INDEX,
                                             rax,
                                             &miss);
   ASSERT(!object.is_identical_to(holder));
+  Handle<Object> prototype(object->GetPrototype(isolate()), isolate());
   CheckPrototypes(
-      Handle<JSObject>(JSObject::cast(object->GetPrototype(isolate()))),
+      IC::CurrentTypeOf(prototype, isolate()),
       rax, holder, rbx, rdx, rdi, name, &miss);
 
   Register receiver = rax;
   Register index = rdi;
   Register scratch = rdx;
   Register result = rax;
   __ movq(receiver, args.GetReceiverOperand());
   if (argc > 0) {
     __ movq(index, args.GetArgumentOperand(1));
   } else {
@@ skipping 50 matching lines @@
   const int argc = arguments().immediate();
   StackArgumentsAccessor args(rsp, argc);
   if (!object->IsJSObject() || argc != 1) return Handle<Code>::null();
 
   Label miss;
   GenerateNameCheck(name, &miss);
 
   if (cell.is_null()) {
     __ movq(rdx, args.GetReceiverOperand());
     __ JumpIfSmi(rdx, &miss);
-    CheckPrototypes(Handle<JSObject>::cast(object), rdx, holder, rbx, rax, rdi,
-                    name, &miss);
+    CheckPrototypes(IC::CurrentTypeOf(object, isolate()), rdx, holder,
+                    rbx, rax, rdi, name, &miss);
   } else {
     ASSERT(cell->value() == *function);
     GenerateGlobalReceiverCheck(Handle<JSObject>::cast(object), holder, name,
                                 &miss);
     GenerateLoadFunctionFromCell(cell, function, &miss);
   }
 
   // Load the char code argument.
   Register code = rbx;
   __ movq(code, args.GetArgumentOperand(1));
@@ skipping 56 matching lines @@
 
   Label miss;
   GenerateNameCheck(name, &miss);
 
   if (cell.is_null()) {
     __ movq(rdx, args.GetReceiverOperand());
 
     STATIC_ASSERT(kSmiTag == 0);
     __ JumpIfSmi(rdx, &miss);
 
-    CheckPrototypes(Handle<JSObject>::cast(object), rdx, holder, rbx, rax, rdi,
-                    name, &miss);
+    CheckPrototypes(IC::CurrentTypeOf(object, isolate()), rdx, holder,
+                    rbx, rax, rdi, name, &miss);
   } else {
     ASSERT(cell->value() == *function);
     GenerateGlobalReceiverCheck(Handle<JSObject>::cast(object), holder, name,
                                 &miss);
     GenerateLoadFunctionFromCell(cell, function, &miss);
   }
 
   // Load the (only) argument into rax.
   __ movq(rax, args.GetArgumentOperand(1));
 
@@ skipping 101 matching lines @@
   const int argc = arguments().immediate();
   StackArgumentsAccessor args(rsp, argc);
   if (!object->IsJSObject() || argc != 1) return Handle<Code>::null();
 
   Label miss;
   GenerateNameCheck(name, &miss);
 
   if (cell.is_null()) {
     __ movq(rdx, args.GetReceiverOperand());
     __ JumpIfSmi(rdx, &miss);
-    CheckPrototypes(Handle<JSObject>::cast(object), rdx, holder, rbx, rax, rdi,
-                    name, &miss);
+    CheckPrototypes(IC::CurrentTypeOf(object, isolate()), rdx, holder,
+                    rbx, rax, rdi, name, &miss);
   } else {
     ASSERT(cell->value() == *function);
     GenerateGlobalReceiverCheck(Handle<JSObject>::cast(object), holder, name,
                                 &miss);
     GenerateLoadFunctionFromCell(cell, function, &miss);
   }
   // Load the (only) argument into rax.
   __ movq(rax, args.GetArgumentOperand(1));
 
   // Check if the argument is a smi.
@@ skipping 92 matching lines @@
 
   Counters* counters = isolate()->counters();
   __ IncrementCounter(counters->call_const(), 1);
   __ IncrementCounter(counters->call_const_fast_api(), 1);
 
   // Allocate space for v8::Arguments implicit values. Must be initialized
   // before calling any runtime function.
   __ subq(rsp, Immediate(kFastApiCallArguments * kPointerSize));
 
   // Check that the maps haven't changed and find a Holder as a side effect.
-  CheckPrototypes(Handle<JSObject>::cast(object), rdx, holder, rbx, rax, rdi,
-                  name, depth, &miss);
+  CheckPrototypes(IC::CurrentTypeOf(object, isolate()), rdx, holder,
+                  rbx, rax, rdi, name, depth, &miss);
 
   // Move the return address on top of the stack.
   __ movq(rax,
           StackOperandForReturnAddress(kFastApiCallArguments * kPointerSize));
   __ movq(StackOperandForReturnAddress(0), rax);
 
   GenerateFastApiCall(masm(), optimization, argc, false);
 
   __ bind(&miss);
   __ addq(rsp, Immediate(kFastApiCallArguments * kPointerSize));
@@ skipping 44 matching lines @@
   // Make sure that it's okay not to patch the on stack receiver
   // unless we're doing a receiver map check.
   ASSERT(!object->IsGlobalObject() || check == RECEIVER_MAP_CHECK);
 
   Counters* counters = isolate()->counters();
   switch (check) {
     case RECEIVER_MAP_CHECK:
       __ IncrementCounter(counters->call_const(), 1);
 
       // Check that the maps haven't changed.
-      CheckPrototypes(Handle<JSObject>::cast(object), rdx, holder, rbx, rax,
-                      rdi, name, &miss);
+      CheckPrototypes(IC::CurrentTypeOf(object, isolate()), rdx, holder,
+                      rbx, rax, rdi, name, &miss);
 
       // Patch the receiver on the stack with the global proxy if
       // necessary.
       if (object->IsGlobalObject()) {
         __ movq(rdx, FieldOperand(rdx, GlobalObject::kGlobalReceiverOffset));
         __ movq(args.GetReceiverOperand(), rdx);
       }
       break;
 
-    case STRING_CHECK:
+    case STRING_CHECK: {
       // Check that the object is a string.
       __ CmpObjectType(rdx, FIRST_NONSTRING_TYPE, rax);
       __ j(above_equal, &miss);
       // Check that the maps starting from the prototype haven't changed.
       GenerateDirectLoadGlobalFunctionPrototype(
           masm(), Context::STRING_FUNCTION_INDEX, rax, &miss);
+      Handle<Object> prototype(object->GetPrototype(isolate()), isolate());
       CheckPrototypes(
-          Handle<JSObject>(JSObject::cast(object->GetPrototype(isolate()))),
+          IC::CurrentTypeOf(prototype, isolate()),
           rax, holder, rbx, rdx, rdi, name, &miss);
       break;
-
-    case SYMBOL_CHECK:
+    }
+    case SYMBOL_CHECK: {
       // Check that the object is a symbol.
       __ CmpObjectType(rdx, SYMBOL_TYPE, rax);
       __ j(not_equal, &miss);
       // Check that the maps starting from the prototype haven't changed.
       GenerateDirectLoadGlobalFunctionPrototype(
           masm(), Context::SYMBOL_FUNCTION_INDEX, rax, &miss);
+      Handle<Object> prototype(object->GetPrototype(isolate()), isolate());
       CheckPrototypes(
-          Handle<JSObject>(JSObject::cast(object->GetPrototype(isolate()))),
+          IC::CurrentTypeOf(prototype, isolate()),
           rax, holder, rbx, rdx, rdi, name, &miss);
       break;
-
+    }
     case NUMBER_CHECK: {
       Label fast;
       // Check that the object is a smi or a heap number.
       __ JumpIfSmi(rdx, &fast);
       __ CmpObjectType(rdx, HEAP_NUMBER_TYPE, rax);
       __ j(not_equal, &miss);
       __ bind(&fast);
       // Check that the maps starting from the prototype haven't changed.
       GenerateDirectLoadGlobalFunctionPrototype(
           masm(), Context::NUMBER_FUNCTION_INDEX, rax, &miss);
+      Handle<Object> prototype(object->GetPrototype(isolate()), isolate());
       CheckPrototypes(
-          Handle<JSObject>(JSObject::cast(object->GetPrototype(isolate()))),
+          IC::CurrentTypeOf(prototype, isolate()),
           rax, holder, rbx, rdx, rdi, name, &miss);
       break;
     }
     case BOOLEAN_CHECK: {
       GenerateBooleanCheck(rdx, &miss);
       // Check that the maps starting from the prototype haven't changed.
       GenerateDirectLoadGlobalFunctionPrototype(
           masm(), Context::BOOLEAN_FUNCTION_INDEX, rax, &miss);
+      Handle<Object> prototype(object->GetPrototype(isolate()), isolate());
       CheckPrototypes(
-          Handle<JSObject>(JSObject::cast(object->GetPrototype(isolate()))),
+          IC::CurrentTypeOf(prototype, isolate()),
           rax, holder, rbx, rdx, rdi, name, &miss);
       break;
     }
   }
 
   Label success;
   __ jmp(&success);
 
   // Handle call cache miss.
   __ bind(&miss);
@@ skipping 528 matching lines @@
   // -----------------------------------
   TailCallBuiltin(masm, Builtins::kKeyedLoadIC_Miss);
 }
 
 
 #undef __
 
 } }  // namespace v8::internal
 
 #endif  // V8_TARGET_ARCH_X64