[string] Move String.p.toLowerCase to CSA

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 1220 matching lines @@
            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);
 }
 
+Node* CodeStubAssembler::PointerToSeqStringData(Node* seq_string) {
+  CSA_ASSERT(this, IsString(seq_string));
+  CSA_ASSERT(this,
+             IsSequentialStringInstanceType(LoadInstanceType(seq_string)));
+  STATIC_ASSERT(SeqOneByteString::kHeaderSize == SeqTwoByteString::kHeaderSize);
+  return IntPtrAdd(
+      BitcastTaggedToWord(seq_string),
+      IntPtrConstant(SeqOneByteString::kHeaderSize - kHeapObjectTag));
+}
+
 Node* CodeStubAssembler::LoadJSValueValue(Node* object) {
   CSA_ASSERT(this, IsJSValue(object));
   return LoadObjectField(object, JSValue::kValueOffset);
 }
 
 Node* CodeStubAssembler::LoadWeakCellValueUnchecked(Node* weak_cell) {
   // TODO(ishell): fix callers.
   return LoadObjectField(weak_cell, WeakCell::kValueOffset);
 }
 
@@ skipping 2398 matching lines @@
     var_result.Bind(
         CallRuntime(Runtime::kSubString, context, string, from, to));
     Goto(&end);
   }
 
   BIND(&end);
   return var_result.value();
 }
 
 ToDirectStringAssembler::ToDirectStringAssembler(
-    compiler::CodeAssemblerState* state, Node* string)
+    compiler::CodeAssemblerState* state, Node* string, Flags flags)
     : CodeStubAssembler(state),
       var_string_(this, MachineRepresentation::kTagged, string),
       var_instance_type_(this, MachineRepresentation::kWord32),
       var_offset_(this, MachineType::PointerRepresentation()),
-      var_is_external_(this, MachineRepresentation::kWord32) {
+      var_is_external_(this, MachineRepresentation::kWord32),
+      flags_(flags) {
   CSA_ASSERT(this, TaggedIsNotSmi(string));
   CSA_ASSERT(this, IsString(string));
 
   var_string_.Bind(string);
   var_offset_.Bind(IntPtrConstant(0));
   var_instance_type_.Bind(LoadInstanceType(string));
   var_is_external_.Bind(Int32Constant(0));
 }
 
 Node* ToDirectStringAssembler::TryToDirect(Label* if_bailout) {
@@ skipping 36 matching lines @@
     Node* const lhs = LoadObjectField(string, ConsString::kFirstOffset);
     var_string_.Bind(lhs);
     var_instance_type_.Bind(LoadInstanceType(lhs));
 
     Goto(&dispatch);
   }
 
   // Sliced string. Fetch parent and correct start index by offset.
   BIND(&if_issliced);
   {
-    Node* const string = var_string_.value();
-    Node* const sliced_offset =
-        LoadAndUntagObjectField(string, SlicedString::kOffsetOffset);
-    var_offset_.Bind(IntPtrAdd(var_offset_.value(), sliced_offset));
+    if (flags_ & kDontUnpackSlicedStrings) {
+      Goto(if_bailout);
+    } else {
+      Node* const string = var_string_.value();
+      Node* const sliced_offset =
+          LoadAndUntagObjectField(string, SlicedString::kOffsetOffset);
+      var_offset_.Bind(IntPtrAdd(var_offset_.value(), sliced_offset));
 
-    Node* const parent = LoadObjectField(string, SlicedString::kParentOffset);
-    var_string_.Bind(parent);
-    var_instance_type_.Bind(LoadInstanceType(parent));
+      Node* const parent = LoadObjectField(string, SlicedString::kParentOffset);
+      var_string_.Bind(parent);
+      var_instance_type_.Bind(LoadInstanceType(parent));
 
-    Goto(&dispatch);
+      Goto(&dispatch);
+    }
   }
 
   // Thin string. Fetch the actual string.
   BIND(&if_isthin);
   {
     Node* const string = var_string_.value();
     Node* const actual_string =
         LoadObjectField(string, ThinString::kActualOffset);
     Node* const actual_instance_type = LoadInstanceType(actual_string);
 
@@ skipping 5145 matching lines @@
         formatted.c_str(), TENURED);
     CallRuntime(Runtime::kGlobalPrint, NoContextConstant(),
                 HeapConstant(string));
   }
   CallRuntime(Runtime::kDebugPrint, NoContextConstant(), tagged_value);
 #endif
 }
 
 }  // namespace internal
 }  // namespace v8