First version of the new generators implementation.

src/interpreter/bytecode-generator.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_INTERPRETER_BYTECODE_GENERATOR_H_
 #define V8_INTERPRETER_BYTECODE_GENERATOR_H_
 
 #include "src/ast/ast.h"
 #include "src/interpreter/bytecode-array-builder.h"
 #include "src/interpreter/bytecodes.h"
@@ skipping 91 matching lines @@
   void BuildKeyedSuperPropertyLoad(Register receiver, Register home_object,
                                    Register key);
 
   void BuildThrowIfHole(Handle<String> name);
   void BuildThrowIfNotHole(Handle<String> name);
   void BuildThrowReassignConstant(Handle<String> name);
   void BuildThrowReferenceError(Handle<String> name);
   void BuildHoleCheckForVariableLoad(VariableMode mode, Handle<String> name);
   void BuildHoleCheckForVariableAssignment(Variable* variable, Token::Value op);
 
+  void BuildGeneratorPrologue();

[rmcilroy, 2016/04/15 13:17:46]

nit - We've been a bit inconsistent with Visit vs. Build, but I think
VisitGeneratorPrologue is probably more appropriate here.

[neis, 2016/04/18 08:04:17]

Done.

+
   void VisitArgumentsObject(Variable* variable);
   void VisitRestArgumentsArray(Variable* rest);
   void VisitCallSuper(Call* call);
   void VisitClassLiteralContents(ClassLiteral* expr);
   void VisitClassLiteralForRuntimeDefinition(ClassLiteral* expr);
   void VisitClassLiteralProperties(ClassLiteral* expr, Register literal,
                                    Register prototype);
   void VisitClassLiteralStaticPrototypeWithComputedName(Register name);
   void VisitThisFunctionVariable(Variable* variable);
   void VisitNewTargetVariable(Variable* variable);
@@ skipping 75 matching lines @@
   Isolate* isolate_;
   Zone* zone_;
   BytecodeArrayBuilder* builder_;
   CompilationInfo* info_;
   Scope* scope_;
   ZoneVector<Handle<Object>> globals_;
   ControlScope* execution_control_;
   ContextScope* execution_context_;
   ExpressionResultScope* execution_result_;
   RegisterAllocationScope* register_allocator_;
+  ZoneVector<BytecodeLabel> resume_points_;  // For generator functions.

[rmcilroy, 2016/04/15 13:17:46]

just generator_resume_points_, then you don't need to comment?

[neis, 2016/04/18 08:04:17]

Done.

   int try_catch_nesting_level_;
   int try_finally_nesting_level_;
+  int yield_count_;  // For generator functions: number of yields seen so far.

[rmcilroy, 2016/04/15 13:17:46]

ditto?

[neis, 2016/04/18 08:04:17]

Done.

 };
 
 }  // namespace interpreter
 }  // namespace internal
 }  // namespace v8
 
 #endif  // V8_INTERPRETER_BYTECODE_GENERATOR_H_