[turbofan] inline %StringIteratorPrototype%.next in JSBuiltinReducer.

src/compiler/typer.cc

 // Copyright 2014 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/compiler/typer.h"
 
 #include <iomanip>
 
 #include "src/base/flags.h"
 #include "src/bootstrapper.h"
@@ skipping 277 matching lines @@
 
 #define DECLARE_METHOD(x) static Type* x##Typer(Type*, Type*, Typer*);
   JS_SIMPLE_BINOP_LIST(DECLARE_METHOD)
 #undef DECLARE_METHOD
 
   static Type* JSTypeOfTyper(Type*, Typer*);
   static Type* JSCallFunctionTyper(Type*, Typer*);
 
   static Type* ReferenceEqualTyper(Type*, Type*, Typer*);
   static Type* StringFromCharCodeTyper(Type*, Typer*);
+  static Type* StringFromCodePointTyper(Type*, Typer*);
 
   Reduction UpdateType(Node* node, Type* current) {
     if (NodeProperties::IsTyped(node)) {
       // Widen the type of a previously typed node.
       Type* previous = NodeProperties::GetType(node);
       if (node->opcode() == IrOpcode::kPhi ||
           node->opcode() == IrOpcode::kInductionVariablePhi) {
         // Speed up termination in the presence of range types:
         current = Weaken(node, current, previous);
       }
@@ skipping 1236 matching lines @@
   double min = type->Min();
   double max = type->Max();
   if (min == max) {
     uint32_t code = static_cast<uint32_t>(min) & String::kMaxUtf16CodeUnitU;
     Handle<String> string = f->LookupSingleCharacterStringFromCode(code);
     return Type::Constant(string, t->zone());
   }
   return Type::String();
 }
 
+Type* Typer::Visitor::StringFromCodePointTyper(Type* type, Typer* t) {
+  type = NumberToUint32(ToNumber(type, t), t);
+  Factory* f = t->isolate()->factory();
+  double min = type->Min();
+  double max = type->Max();
+  if (min == max) {
+    uint32_t code = static_cast<uint32_t>(min) & String::kMaxUtf16CodeUnitU;
+    Handle<String> string = f->LookupSingleCharacterStringFromCode(code);
+    return Type::Constant(string, t->zone());
+  }
+  return Type::String();
+}
+
 Type* Typer::Visitor::TypeStringCharCodeAt(Node* node) {
   // TODO(bmeurer): We could do better here based on inputs.
   return Type::Range(0, kMaxUInt16, zone());
 }
 
 Type* Typer::Visitor::TypeStringFromCharCode(Node* node) {
   return TypeUnaryOp(node, StringFromCharCodeTyper);
 }
 
+Type* Typer::Visitor::TypeStringFromCodePoint(Node* node) {
+  return TypeUnaryOp(node, StringFromCodePointTyper);
+}
+
 Type* Typer::Visitor::TypeCheckBounds(Node* node) {
   Type* index = Operand(node, 0);
   Type* length = Operand(node, 1);
   index = Type::Intersect(index, Type::Integral32(), zone());
   if (!index->IsInhabited() || !length->IsInhabited()) return Type::None();
   double min = std::max(index->Min(), 0.0);
   double max = std::min(index->Max(), length->Max() - 1);
   if (max < min) return Type::None();
   return Type::Range(min, max, zone());
 }
@@ skipping 143 matching lines @@
 Type* Typer::Visitor::TypeConstant(Handle<Object> value) {
   if (Type::IsInteger(*value)) {
     return Type::Range(value->Number(), value->Number(), zone());
   }
   return Type::Constant(value, zone());
 }
 
 }  // namespace compiler
 }  // namespace internal
 }  // namespace v8