[esnext] implement frontend changes for async/await proposal

src/objects.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_OBJECTS_H_
 #define V8_OBJECTS_H_
 
 #include <iosfwd>
 
 #include "src/assert-scope.h"
@@ skipping 4277 matching lines @@
   class FunctionVariableField
       : public BitField<VariableAllocationInfo, HasNewTargetField::kNext, 2> {};
   class FunctionVariableMode
       : public BitField<VariableMode, FunctionVariableField::kNext, 3> {};
   class AsmModuleField : public BitField<bool, FunctionVariableMode::kNext, 1> {
   };
   class AsmFunctionField : public BitField<bool, AsmModuleField::kNext, 1> {};
   class HasSimpleParametersField
       : public BitField<bool, AsmFunctionField::kNext, 1> {};
   class FunctionKindField
-      : public BitField<FunctionKind, HasSimpleParametersField::kNext, 8> {};
+      : public BitField<FunctionKind, HasSimpleParametersField::kNext, 9> {};
 
   // BitFields representing the encoded information for context locals in the
   // ContextLocalInfoEntries part.
   class ContextLocalMode:      public BitField<VariableMode,         0, 3> {};
   class ContextLocalInitFlag:  public BitField<InitializationFlag,   3, 1> {};
   class ContextLocalMaybeAssignedFlag
       : public BitField<MaybeAssignedFlag, 4, 1> {};
 
   friend class ScopeIterator;
 };
@@ skipping 2537 matching lines @@
 
   // Indicates that code for this function cannot be compiled with Crankshaft.
   DECL_BOOLEAN_ACCESSORS(dont_crankshaft)
 
   // Indicates that code for this function cannot be flushed.
   DECL_BOOLEAN_ACCESSORS(dont_flush)
 
   // Indicates that this function is a generator.
   DECL_BOOLEAN_ACCESSORS(is_generator)
 
+  // Indicates that this function is an async function.
+  DECL_BOOLEAN_ACCESSORS(is_async)
+
+  // Indicates that this function can be suspended, either via YieldExpressions
+  // or AwaitExpressions.
+  inline bool is_resumable() const;
+
   // Indicates that this function is an arrow function.
   DECL_BOOLEAN_ACCESSORS(is_arrow)
 
   // Indicates that this function is a concise method.
   DECL_BOOLEAN_ACCESSORS(is_concise_method)
 
   // Indicates that this function is a getter.
   DECL_BOOLEAN_ACCESSORS(is_getter_function)
 
   // Indicates that this function is a setter.
@@ skipping 276 matching lines @@
     kFunctionKind,
     kIsArrow = kFunctionKind,
     kIsGenerator,
     kIsConciseMethod,
     kIsDefaultConstructor,
     kIsSubclassConstructor,
     kIsBaseConstructor,
     kIsGetterFunction,
     kIsSetterFunction,
     // byte 3
+    kIsAsyncFunction,
     kDeserialized,
     kIsDeclaration,
     kCompilerHintsCount,  // Pseudo entry
   };
   // Add hints for other modes when they're added.
   STATIC_ASSERT(LANGUAGE_END == 3);
   // kFunctionKind has to be byte-aligned
   STATIC_ASSERT((kFunctionKind % kBitsPerByte) == 0);
 // Make sure that FunctionKind and byte 2 are in sync:
 #define ASSERT_FUNCTION_KIND_ORDER(functionKind, compilerFunctionKind) \
   STATIC_ASSERT(FunctionKind::functionKind ==                          \
                 1 << (compilerFunctionKind - kFunctionKind))
   ASSERT_FUNCTION_KIND_ORDER(kArrowFunction, kIsArrow);
   ASSERT_FUNCTION_KIND_ORDER(kGeneratorFunction, kIsGenerator);
   ASSERT_FUNCTION_KIND_ORDER(kConciseMethod, kIsConciseMethod);
   ASSERT_FUNCTION_KIND_ORDER(kDefaultConstructor, kIsDefaultConstructor);
   ASSERT_FUNCTION_KIND_ORDER(kSubclassConstructor, kIsSubclassConstructor);
   ASSERT_FUNCTION_KIND_ORDER(kBaseConstructor, kIsBaseConstructor);
   ASSERT_FUNCTION_KIND_ORDER(kGetterFunction, kIsGetterFunction);
   ASSERT_FUNCTION_KIND_ORDER(kSetterFunction, kIsSetterFunction);
 #undef ASSERT_FUNCTION_KIND_ORDER
 
-  class FunctionKindBits : public BitField<FunctionKind, kIsArrow, 8> {};
+  class FunctionKindBits : public BitField<FunctionKind, kIsArrow, 9> {};
 
   class DeoptCountBits : public BitField<int, 0, 4> {};
   class OptReenableTriesBits : public BitField<int, 4, 18> {};
   class ICAgeBits : public BitField<int, 22, 8> {};
 
   class OptCountBits : public BitField<int, 0, 22> {};
   class DisabledOptimizationReasonBits : public BitField<int, 22, 8> {};
 
  private:
 #if V8_HOST_ARCH_32_BIT
@@ skipping 3548 matching lines @@
     }
     return value;
   }
 };
 
 
 }  // NOLINT, false-positive due to second-order macros.
 }  // NOLINT, false-positive due to second-order macros.
 
 #endif  // V8_OBJECTS_H_