[es7] implement |do| expressions proposal

src/parser.h

Index: src/parser.h
diff --git a/src/parser.h b/src/parser.h
index 569236c593df736db2dc3786f327019b16fa4b80..7906563bd42191fbd9018996e397ba4e2c127db7 100644
--- a/src/parser.h
+++ b/src/parser.h
@@ -796,6 +796,8 @@ class ParserTraits {
       const Scanner::Location& params_loc,
       Scanner::Location* duplicate_loc, bool* ok);
 
+  V8_INLINE DoExpression* ParseDoExpression(bool* ok);
+
   void ReindexLiterals(const ParserFormalParameters& parameters);
 
   // Temporary glue; these functions will move to ParserBase.
@@ -971,6 +973,7 @@ class Parser : public ParserBase<ParserTraits> {
   Block* ParseVariableStatement(VariableDeclarationContext var_context,
                                 ZoneList<const AstRawString*>* names,
                                 bool* ok);
+  DoExpression* ParseDoExpression(bool* ok);
 
   struct DeclarationDescriptor {
     enum Kind { NORMAL, PARAMETER };
@@ -1104,6 +1107,8 @@ class Parser : public ParserBase<ParserTraits> {
       ForStatement* loop, Statement* init, Expression* cond, Statement* next,
       Statement* body, bool* ok);
 
+  void RewriteDoExpression(Expression* expr, bool* ok);
+
   FunctionLiteral* ParseFunctionLiteral(
       const AstRawString* name, Scanner::Location function_name_location,
       FunctionNameValidity function_name_validity, FunctionKind kind,
@@ -1248,6 +1253,7 @@ ZoneList<Statement*>* ParserTraits::ParseEagerFunctionBody(
                                          function_type, ok);
 }
 
+
 void ParserTraits::CheckConflictingVarDeclarations(v8::internal::Scope* scope,
                                                    bool* ok) {
   parser_->CheckConflictingVarDeclarations(scope, ok);
@@ -1377,6 +1383,13 @@ void ParserTraits::AddParameterInitializationBlock(
     }
   }
 }
+
+
+DoExpression* ParserTraits::ParseDoExpression(bool* ok) {
+  return parser_->ParseDoExpression(ok);
+}
+
+
 }  // namespace internal
 }  // namespace v8