Implement iterator finalization in array destructuring.

src/parsing/parser.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_PARSING_PARSER_H_
 #define V8_PARSING_PARSER_H_
 
 #include "src/allocation.h"
 #include "src/ast/ast.h"
 #include "src/ast/scopes.h"
@@ skipping 448 matching lines @@
   // Generate AST node that throws a TypeError with the given
   // type. Both arguments must be non-null (in the handle sense).
   Expression* NewThrowTypeError(MessageTemplate::Template message,
                                 const AstRawString* arg, int pos);
 
   // Generic AST generator for throwing errors from compiled code.
   Expression* NewThrowError(Runtime::FunctionId function_id,
                             MessageTemplate::Template message,
                             const AstRawString* arg, int pos);
 
+  void FinalizeIteratorUse(Variable* completion, Expression* condition,
+      Variable* iter, Block* iterator_use, Block* result);
+
   Statement* FinalizeForOfStatement(ForOfStatement* loop, int pos);
 
   // Reporting errors.
   void ReportMessageAt(Scanner::Location source_location,
                        MessageTemplate::Template message,
                        const char* arg = NULL,
                        ParseErrorType error_type = kSyntaxError);
   void ReportMessage(MessageTemplate::Template message, const char* arg = NULL,
                      ParseErrorType error_type = kSyntaxError);
   void ReportMessage(MessageTemplate::Template message, const AstRawString* arg,
@@ skipping 220 matching lines @@
   void ParseOnBackground(ParseInfo* info);
 
   // Handle errors detected during parsing, move statistics to Isolate,
   // internalize strings (move them to the heap).
   void Internalize(Isolate* isolate, Handle<Script> script, bool error);
   void HandleSourceURLComments(Isolate* isolate, Handle<Script> script);
 
  private:
   friend class ParserTraits;
 
+  // Runtime encoding of different completion modes.
+  enum CompletionKind { NORMAL, THROW, ABRUPT };
+
   // Limit the allowed number of local variables in a function. The hard limit
   // is that offsets computed by FullCodeGenerator::StackOperand and similar
   // functions are ints, and they should not overflow. In addition, accessing
   // local variables creates user-controlled constants in the generated code,
   // and we don't want too much user-controlled memory inside the code (this was
   // the reason why this limit was introduced in the first place; see
   // https://codereview.chromium.org/7003030/ ).
   static const int kMaxNumFunctionLocals = 4194303;  // 2^22-1
 
   // Returns NULL if parsing failed.
@@ skipping 519 matching lines @@
 
 DoExpression* ParserTraits::ParseDoExpression(bool* ok) {
   return parser_->ParseDoExpression(ok);
 }
 
 
 }  // namespace internal
 }  // namespace v8
 
 #endif  // V8_PARSING_PARSER_H_