CSA fast path for Map.prototype.(Get|Has) for string keys.

src/code-stub-assembler.cc

 // Copyright 2016 the V8 project authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 #include "src/code-stub-assembler.h"
 #include "src/code-factory.h"
 #include "src/frames-inl.h"
 #include "src/frames.h"
 
 namespace v8 {
 namespace internal {
@@ skipping 1202 matching lines @@
 }
 
 Node* CodeStubAssembler::LoadNameHashField(Node* name) {
   CSA_ASSERT(this, IsName(name));
   return LoadObjectField(name, Name::kHashFieldOffset, MachineType::Uint32());
 }
 
 Node* CodeStubAssembler::LoadNameHash(Node* name, Label* if_hash_not_computed) {
   Node* hash_field = LoadNameHashField(name);
   if (if_hash_not_computed != nullptr) {
-    GotoIf(IsClearWord32(hash_field, Name::kHashNotComputedMask),

[Camillo Bruni, 2017/07/03 14:51:29]

doh! that might have been me during a refactoring...

[Jarin, 2017/07/04 04:24:47]

Acknowledged.

+    GotoIf(IsSetWord32(hash_field, Name::kHashNotComputedMask),
            if_hash_not_computed);
   }
   return Word32Shr(hash_field, Int32Constant(Name::kHashShift));
 }
 
 Node* CodeStubAssembler::LoadStringLength(Node* object) {
   CSA_ASSERT(this, IsString(object));
   return LoadObjectField(object, String::kLengthOffset);
 }
 
@@ skipping 8151 matching lines @@
         formatted.c_str(), TENURED);
     CallRuntime(Runtime::kGlobalPrint, NoContextConstant(),
                 HeapConstant(string));
   }
   CallRuntime(Runtime::kDebugPrint, NoContextConstant(), tagged_value);
 #endif
 }
 
 }  // namespace internal
 }  // namespace v8