WIP [esnext] implement async iteration proposal

src/compiler/js-operator.h

 // Copyright 2013 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_JS_OPERATOR_H_
 #define V8_COMPILER_JS_OPERATOR_H_
 
 #include "src/base/compiler-specific.h"
 #include "src/globals.h"
 #include "src/runtime/runtime.h"
@@ skipping 471 matching lines @@
 
 bool operator==(CreateLiteralParameters const&, CreateLiteralParameters const&);
 bool operator!=(CreateLiteralParameters const&, CreateLiteralParameters const&);
 
 size_t hash_value(CreateLiteralParameters const&);
 
 std::ostream& operator<<(std::ostream&, CreateLiteralParameters const&);
 
 const CreateLiteralParameters& CreateLiteralParametersOf(const Operator* op);
 
+enum class SuspendType { kYield, kAwait };
+class GeneratorStoreParameters final {
+ public:
+  GeneratorStoreParameters(int register_count, SuspendType suspend_type)
+      : register_count_(register_count), suspend_type_(suspend_type) {}
+
+  int register_count() const { return register_count_; }
+  SuspendType suspend_type() const { return suspend_type_; }
+
+ private:
+  int register_count_;
+  SuspendType suspend_type_;
+};
+
+bool operator==(GeneratorStoreParameters const&,
+                GeneratorStoreParameters const&);
+bool operator!=(GeneratorStoreParameters const&,
+                GeneratorStoreParameters const&);
+
+size_t hash_value(GeneratorStoreParameters const&);
+
+std::ostream& operator<<(std::ostream&, GeneratorStoreParameters const&);
+
+const GeneratorStoreParameters& GeneratorStoreParametersOf(const Operator* op);
+
 BinaryOperationHint BinaryOperationHintOf(const Operator* op);
 
 CompareOperationHint CompareOperationHintOf(const Operator* op);
 
 // Interface for building JavaScript-level operators, e.g. directly from the
 // AST. Most operators have no parameters, thus can be globally shared for all
 // graphs.
 class V8_EXPORT_PRIVATE JSOperatorBuilder final
     : public NON_EXPORTED_BASE(ZoneObject) {
  public:
@@ skipping 91 matching lines @@
   const Operator* TypeOf();
   const Operator* InstanceOf();
   const Operator* OrdinaryHasInstance();
 
   const Operator* ForInNext();
   const Operator* ForInPrepare();
 
   const Operator* LoadMessage();
   const Operator* StoreMessage();
 
-  // Used to implement Ignition's SuspendGenerator bytecode.
-  const Operator* GeneratorStore(int register_count);
+  // Used to implement Ignition's SuspendGenerator / AwaitGenerator bytecode.
+  const Operator* GeneratorStore(int register_count, SuspendType suspend_type);
 
   // Used to implement Ignition's ResumeGenerator bytecode.
   const Operator* GeneratorRestoreContinuation();
   const Operator* GeneratorRestoreRegister(int index);
 
   const Operator* StackCheck();
 
   const Operator* CreateFunctionContext(int slot_count, ScopeType scope_type);
   const Operator* CreateCatchContext(const Handle<String>& name,
                                      const Handle<ScopeInfo>& scope_info);
   const Operator* CreateWithContext(const Handle<ScopeInfo>& scope_info);
   const Operator* CreateBlockContext(const Handle<ScopeInfo>& scpope_info);
   const Operator* CreateModuleContext();
   const Operator* CreateScriptContext(const Handle<ScopeInfo>& scpope_info);
 
  private:
   Zone* zone() const { return zone_; }
 
   const JSOperatorGlobalCache& cache_;
   Zone* const zone_;
 
   DISALLOW_COPY_AND_ASSIGN(JSOperatorBuilder);
 };
 
 }  // namespace compiler
 }  // namespace internal
 }  // namespace v8
 
 #endif  // V8_COMPILER_JS_OPERATOR_H_