[inspector] fix positions for single expression arrow function

src/ast/ast.h

 // Copyright 2012 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_AST_AST_H_
 #define V8_AST_AST_H_
 
 #include "src/ast/ast-types.h"
 #include "src/ast/ast-value-factory.h"
 #include "src/ast/modules.h"
@@ skipping 2689 matching lines @@
         RequiresClassFieldInit::update(bit_field_, requires_class_field_init);
   }
   bool is_class_field_initializer() {
     return IsClassFieldInitializer::decode(bit_field_);
   }
   void set_is_class_field_initializer(bool is_class_field_initializer) {
     bit_field_ =
         IsClassFieldInitializer::update(bit_field_, is_class_field_initializer);
   }
 
+  int return_position() {
+    return std::max(start_position(), end_position() - (has_braces_ ? 1 : 0));
+  }
+
  private:
   friend class AstNodeFactory;
 
   FunctionLiteral(Zone* zone, const AstString* name,
                   AstValueFactory* ast_value_factory, DeclarationScope* scope,
                   ZoneList<Statement*>* body, int materialized_literal_count,
                   int expected_property_count, int parameter_count,
                   int function_length, FunctionType function_type,
                   ParameterFlag has_duplicate_parameters,
                   EagerCompileHint eager_compile_hint, int position,
-                  bool is_function)
+                  bool is_function, bool has_braces)
       : Expression(position, kFunctionLiteral),
         materialized_literal_count_(materialized_literal_count),
         expected_property_count_(expected_property_count),
         parameter_count_(parameter_count),
         function_length_(function_length),
         function_token_position_(kNoSourcePosition),
         yield_count_(0),
+        has_braces_(has_braces),
         raw_name_(name),
         scope_(scope),
         body_(body),
         raw_inferred_name_(ast_value_factory->empty_string()),
         ast_properties_(zone) {
     bit_field_ |=
         FunctionTypeBits::encode(function_type) | Pretenure::encode(false) |
         HasDuplicateParameters::encode(has_duplicate_parameters ==
                                        kHasDuplicateParameters) |
         IsFunction::encode(is_function) |
@@ skipping 17 matching lines @@
       : public BitField<bool, RequiresClassFieldInit::kNext, 1> {};
   class DontOptimizeReasonField
       : public BitField<BailoutReason, IsClassFieldInitializer::kNext, 8> {};
 
   int materialized_literal_count_;
   int expected_property_count_;
   int parameter_count_;
   int function_length_;
   int function_token_position_;
   int yield_count_;
+  bool has_braces_;
 
   const AstString* raw_name_;
   DeclarationScope* scope_;
   ZoneList<Statement*>* body_;
   const AstString* raw_inferred_name_;
   Handle<String> inferred_name_;
   AstProperties ast_properties_;
 };
 
 // Property is used for passing information
@@ skipping 675 matching lines @@
   Throw* NewThrow(Expression* exception, int pos) {
     return new (zone_) Throw(exception, pos);
   }
 
   FunctionLiteral* NewFunctionLiteral(
       const AstRawString* name, DeclarationScope* scope,
       ZoneList<Statement*>* body, int materialized_literal_count,
       int expected_property_count, int parameter_count, int function_length,
       FunctionLiteral::ParameterFlag has_duplicate_parameters,
       FunctionLiteral::FunctionType function_type,
-      FunctionLiteral::EagerCompileHint eager_compile_hint, int position) {
+      FunctionLiteral::EagerCompileHint eager_compile_hint, int position,
+      bool has_braces) {
     return new (zone_) FunctionLiteral(
         zone_, name, ast_value_factory_, scope, body,
         materialized_literal_count, expected_property_count, parameter_count,
         function_length, function_type, has_duplicate_parameters,
-        eager_compile_hint, position, true);
+        eager_compile_hint, position, true, has_braces);
   }
 
   // Creates a FunctionLiteral representing a top-level script, the
   // result of an eval (top-level or otherwise), or the result of calling
   // the Function constructor.
   FunctionLiteral* NewScriptOrEvalFunctionLiteral(
       DeclarationScope* scope, ZoneList<Statement*>* body,
       int materialized_literal_count, int expected_property_count,
       int parameter_count) {
     return new (zone_) FunctionLiteral(
         zone_, ast_value_factory_->empty_string(), ast_value_factory_, scope,
         body, materialized_literal_count, expected_property_count,
         parameter_count, parameter_count, FunctionLiteral::kAnonymousExpression,
         FunctionLiteral::kNoDuplicateParameters,
-        FunctionLiteral::kShouldLazyCompile, 0, false);
+        FunctionLiteral::kShouldLazyCompile, 0, false, true);
   }
 
   ClassLiteral::Property* NewClassLiteralProperty(
       Expression* key, Expression* value, ClassLiteralProperty::Kind kind,
       bool is_static, bool is_computed_name) {
     return new (zone_)
         ClassLiteral::Property(key, value, kind, is_static, is_computed_name);
   }
 
   ClassLiteral* NewClassLiteral(VariableProxy* proxy, Expression* extends,
@@ skipping 105 matching lines @@
                                     : NULL;                                   \
   }
 AST_NODE_LIST(DECLARE_NODE_FUNCTIONS)
 #undef DECLARE_NODE_FUNCTIONS
 
 
 }  // namespace internal
 }  // namespace v8
 
 #endif  // V8_AST_AST_H_