Create ImportDeclarations for default imports.

BUG=v8:1569
LOG=n

Review URL: https://codereview.chromium.org/958213006

Cr-Commit-Position: refs/heads/master@{#26921}

src/parser.cc

@@ -1422,16 +1422,19 @@ Statement* Parser::ParseImportDeclaration(bool* ok) {
   }
 
   // Parse ImportedDefaultBinding if present.
-  const AstRawString* imported_default_binding = NULL;
+  ImportDeclaration* import_default_declaration = NULL;
   if (tok != Token::MUL && tok != Token::LBRACE) {
-    imported_default_binding =
+    const AstRawString* local_name =
         ParseIdentifier(kDontAllowEvalOrArguments, CHECK_OK);
-    // TODO(ES6): Add an appropriate declaration.
+    VariableProxy* proxy = NewUnresolved(local_name, IMPORT);
+    import_default_declaration = factory()->NewImportDeclaration(
+        proxy, ast_value_factory()->default_string(), NULL, scope_, pos);
+    Declare(import_default_declaration, true, CHECK_OK);
   }
 
   const AstRawString* module_instance_binding = NULL;
   ZoneList<ImportDeclaration*>* named_declarations = NULL;
-  if (imported_default_binding == NULL || Check(Token::COMMA)) {
+  if (import_default_declaration == NULL || Check(Token::COMMA)) {
     switch (peek()) {
       case Token::MUL: {
         Consume(Token::MUL);
@@ -1461,8 +1464,8 @@ Statement* Parser::ParseImportDeclaration(bool* ok) {
     // TODO(ES6): Set the module specifier for the module namespace binding.
   }
 
-  if (imported_default_binding != NULL) {
-    // TODO(ES6): Set the module specifier for the default binding.
+  if (import_default_declaration != NULL) {
+    import_default_declaration->set_module_specifier(module_specifier);
   }
 
   if (named_declarations != NULL) {

test/cctest/test-parsing.cc

@@ -5219,7 +5219,10 @@ TEST(ModuleParsingInternals) {
                                         128 * 1024);
 
   static const char kSource[] =
-      "let x = 5; export { x as y }; import { q as z } from 'm.js';";
+      "let x = 5;"
+      "export { x as y };"
+      "import { q as z } from 'm.js';"
+      "import n from 'n.js'";
   i::Handle<i::String> source = factory->NewStringFromAsciiChecked(kSource);
   i::Handle<i::Script> script = factory->NewScript(source);
   i::CompilationInfoWithZone info(script);
@@ -5242,13 +5245,17 @@ TEST(ModuleParsingInternals) {
   CHECK_NOT_NULL(local_name);
   CHECK(local_name->IsOneByteEqualTo("x"));
   i::ZoneList<i::Declaration*>* declarations = func->scope()->declarations();
-  CHECK_EQ(2, declarations->length());
+  CHECK_EQ(3, declarations->length());
   CHECK(declarations->at(0)->proxy()->raw_name()->IsOneByteEqualTo("x"));
   i::ImportDeclaration* import_decl =
       declarations->at(1)->AsImportDeclaration();
   CHECK(import_decl->import_name()->IsOneByteEqualTo("q"));
   CHECK(import_decl->proxy()->raw_name()->IsOneByteEqualTo("z"));
   CHECK(import_decl->module_specifier()->IsOneByteEqualTo("m.js"));
+  import_decl = declarations->at(2)->AsImportDeclaration();
+  CHECK(import_decl->import_name()->IsOneByteEqualTo("default"));
+  CHECK(import_decl->proxy()->raw_name()->IsOneByteEqualTo("n"));
+  CHECK(import_decl->module_specifier()->IsOneByteEqualTo("n.js"));
 }