[builtins] Migrate String.prototype.charCodeAt and String.prototype.charAt to TurboFan.

src/compiler/code-stub-assembler.h

 // Copyright 2015 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.
 
 #ifndef V8_COMPILER_CODE_STUB_ASSEMBLER_H_
 #define V8_COMPILER_CODE_STUB_ASSEMBLER_H_
 
 #include <map>
 
 // Clients of this interface shouldn't depend on lots of compiler internals.
@@ skipping 148 matching lines @@
   // Constants.
   Node* Int32Constant(int value);
   Node* IntPtrConstant(intptr_t value);
   Node* NumberConstant(double value);
   Node* SmiConstant(Smi* value);
   Node* HeapConstant(Handle<HeapObject> object);
   Node* BooleanConstant(bool value);
   Node* ExternalConstant(ExternalReference address);
   Node* Float64Constant(double value);
   Node* BooleanMapConstant();
+  Node* EmptyStringConstant();
   Node* HeapNumberMapConstant();
+  Node* NaNConstant();
+  Node* NoContextConstant();
   Node* NullConstant();
   Node* UndefinedConstant();
 
   Node* Parameter(int value);
   void Return(Node* value);
 
   void Bind(Label* label);
   void Goto(Label* label);
   void GotoIf(Node* condition, Label* true_label);
   void GotoUnless(Node* condition, Label* false_label);
@@ skipping 95 matching lines @@
   // Float64 operations.
   Node* Float64Ceil(Node* x);
   Node* Float64Floor(Node* x);
   Node* Float64Round(Node* x);
   Node* Float64Trunc(Node* x);
 
   // Tag a Word as a Smi value.
   Node* SmiTag(Node* value);
   // Untag a Smi value as a Word.
   Node* SmiUntag(Node* value);
+  Node* SmiToWord(Node* value) { return SmiUntag(value); }
 
   // Smi conversions.
   Node* SmiToFloat64(Node* value);
+  Node* SmiFromWord32(Node* value);
   Node* SmiToWord32(Node* value);
 
   // Smi operations.
   Node* SmiAdd(Node* a, Node* b);
   Node* SmiAddWithOverflow(Node* a, Node* b);
   Node* SmiSub(Node* a, Node* b);
   Node* SmiSubWithOverflow(Node* a, Node* b);
   Node* SmiEqual(Node* a, Node* b);
+  Node* SmiAboveOrEqual(Node* a, Node* b);
   Node* SmiLessThan(Node* a, Node* b);
   Node* SmiLessThanOrEqual(Node* a, Node* b);
   Node* SmiMin(Node* a, Node* b);
 
   // Load a value from the root array.
   Node* LoadRoot(Heap::RootListIndex root_index);
 
   // Check a value for smi-ness
   Node* WordIsSmi(Node* a);
 
   // Check that the value is a positive smi.
   Node* WordIsPositiveSmi(Node* a);
 
   // Load an object pointer from a buffer that isn't in the heap.
   Node* LoadBufferObject(Node* buffer, int offset,
                          MachineType rep = MachineType::AnyTagged());
   // Load a field from an object on the heap.
   Node* LoadObjectField(Node* object, int offset,
                         MachineType rep = MachineType::AnyTagged());
+  // Store a field to an object on the heap.
+  Node* StoreObjectFieldNoWriteBarrier(
+      Node* object, int offset, Node* value,
+      MachineRepresentation rep = MachineRepresentation::kTagged);
   // Load the floating point value of a HeapNumber.
   Node* LoadHeapNumberValue(Node* object);
   // Store the floating point value of a HeapNumber.
   Node* StoreHeapNumberValue(Node* object, Node* value);
   // Truncate the floating point value of a HeapNumber to an Int32.
   Node* TruncateHeapNumberValueToWord32(Node* object);
   // Load the bit field of a Map.
   Node* LoadMapBitField(Node* map);
   // Load bit field 2 of a map.
   Node* LoadMapBitField2(Node* map);
   // Load bit field 3 of a map.
   Node* LoadMapBitField3(Node* map);
   // Load the instance type of a map.
   Node* LoadMapInstanceType(Node* map);
   // Load the instance descriptors of a map.
   Node* LoadMapDescriptors(Node* map);
 
   // Load the hash field of a name.
   Node* LoadNameHash(Node* name);
 
   // Load an array element from a FixedArray.
   Node* LoadFixedArrayElementInt32Index(Node* object, Node* int32_index,
                                         int additional_offset = 0);
   Node* LoadFixedArrayElementSmiIndex(Node* object, Node* smi_index,
                                       int additional_offset = 0);
   Node* LoadFixedArrayElementConstantIndex(Node* object, int index);
 
   // Allocate an object of the given size.
   Node* Allocate(int size, AllocationFlags flags = kNone);
+  Node* InnerAllocate(Node* previous, int offset);
   // Allocate a HeapNumber without initializing its value.
   Node* AllocateHeapNumber();
   // Allocate a HeapNumber with a specific value.
   Node* AllocateHeapNumberWithValue(Node* value);
+  // Allocate a SeqOneByteString with the given length.
+  Node* AllocateSeqOneByteString(int length);
+  // Allocate a SeqTwoByteString with the given length.
+  Node* AllocateSeqTwoByteString(int length);
 
   // Store an array element to a FixedArray.
+  Node* StoreFixedArrayElementInt32Index(Node* object, Node* index,
+                                         Node* value);
   Node* StoreFixedArrayElementNoWriteBarrier(Node* object, Node* index,
                                              Node* value);
   // Load the Map of an HeapObject.
   Node* LoadMap(Node* object);
   // Store the Map of an HeapObject.
   Node* StoreMapNoWriteBarrier(Node* object, Node* map);
   // Load the instance type of an HeapObject.
   Node* LoadInstanceType(Node* object);
 
   // Load the elements backing store of a JSObject.
   Node* LoadElements(Node* object);
   // Load the length of a fixed array base instance.
   Node* LoadFixedArrayBaseLength(Node* array);
 
   // Returns a node that is true if the given bit is set in |word32|.
   template <typename T>
   Node* BitFieldDecode(Node* word32) {
     return BitFieldDecode(word32, T::kShift, T::kMask);
   }
 
   Node* BitFieldDecode(Node* word32, uint32_t shift, uint32_t mask);
 
   // Conversions.
   Node* ChangeFloat64ToTagged(Node* value);
   Node* ChangeInt32ToTagged(Node* value);
   Node* TruncateTaggedToFloat64(Node* context, Node* value);
   Node* TruncateTaggedToWord32(Node* context, Node* value);
 
+  // Type conversions.
+  // Throws a TypeError for {method_name} if {value} is not coercible to Object,
+  // or returns the {value} converted to a String otherwise.
+  Node* ToThisString(Node* context, Node* value, char const* method_name);
+
+  // String helpers.
+  // Load a character from a String (might flatten a ConsString).
+  Node* StringCharCodeAt(Node* string, Node* smi_index);
+  // Return the single character string with only {code}.
+  Node* StringFromCharCode(Node* code);
+
   // Branching helpers.
   // TODO(danno): Can we be more cleverish wrt. edge-split?
   void BranchIf(Node* condition, Label* if_true, Label* if_false);
 
 #define BRANCH_HELPER(name)                                                \
   void BranchIf##name(Node* a, Node* b, Label* if_true, Label* if_false) { \
     BranchIf(name(a, b), if_true, if_false);                               \
   }
   CODE_STUB_ASSEMBLER_COMPARE_BINARY_OP_LIST(BRANCH_HELPER)
 #undef BRANCH_HELPER
@@ skipping 87 matching lines @@
   // Map of variables to the list of value nodes that have been added from each
   // merge path in their order of merging.
   std::map<Variable::Impl*, std::vector<Node*>> variable_merges_;
 };
 
 }  // namespace compiler
 }  // namespace internal
 }  // namespace v8
 
 #endif  // V8_COMPILER_CODE_STUB_ASSEMBLER_H_