[es7] implement |do| expressions proposal

src/parser.cc

Index: src/parser.cc
diff --git a/src/parser.cc b/src/parser.cc
index 4ddb6c18fc46e28c706c0b229255a2e81fa2a32a..f6db0d545bb095b90c333a34fdcacf99a1be82c0 100644
--- a/src/parser.cc
+++ b/src/parser.cc
@@ -15,6 +15,7 @@
 #include "src/compiler.h"
 #include "src/messages.h"
 #include "src/preparser.h"
+#include "src/rewriter.h"
 #include "src/runtime/runtime.h"
 #include "src/scanner-character-streams.h"
 #include "src/scopeinfo.h"
@@ -924,6 +925,7 @@ Parser::Parser(ParseInfo* info)
   set_allow_harmony_new_target(FLAG_harmony_new_target);
   set_allow_strong_mode(FLAG_strong_mode);
   set_allow_legacy_const(FLAG_legacy_const);
+  set_allow_do_expression_parsing(FLAG_do_expression_parsing);
   for (int feature = 0; feature < v8::Isolate::kUseCounterFeatureCount;
        ++feature) {
     use_counts_[feature] = 0;
@@ -3581,6 +3583,14 @@ Statement* Parser::DesugarLexicalBindingsInForStatement(
 }
 
 
+void Parser::RewriteDoExpression(Expression* expr, bool* ok) {
+  DCHECK(expr->IsDoExpression());
+  if (!Rewriter::Rewrite(this, expr->AsDoExpression(), ast_value_factory())) {
+    *ok = false;
+  }
+}
+
+
 Statement* Parser::ParseForStatement(ZoneList<const AstRawString*>* labels,
                                      bool* ok) {
   // ForStatement ::
@@ -4768,6 +4778,7 @@ PreParser::PreParseResult Parser::ParseLazyFunctionBodyWithPreParser(
     SET_ALLOW(harmony_spread_arrays);
     SET_ALLOW(harmony_new_target);
     SET_ALLOW(strong_mode);
+    SET_ALLOW(do_expression_parsing);
 #undef SET_ALLOW
   }
   PreParser::PreParseResult result = reusable_preparser_->PreParseLazyFunction(