Split parsing of functions and top-level code into two separate methods

src/parsing/parsing.cc

+// Copyright 2016 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.
+
+#include "src/parsing/parsing.h"
+
+#include <memory>
+
+#include "src/ast/ast.h"
+#include "src/parsing/parse-info.h"
+#include "src/parsing/parser.h"
+
+namespace v8 {
+namespace internal {
+namespace parsing {
+
+bool ParseProgram(ParseInfo* info) {
+  DCHECK(info->is_toplevel());
+  DCHECK_NULL(info->literal());
+
+  Parser parser(info);
+
+  FunctionLiteral* result = nullptr;
+  // Ok to use Isolate here; this function is only called in the main thread.
+  DCHECK(parser.parsing_on_main_thread_);
+  Isolate* isolate = info->isolate();
+
+  parser.SetCachedData(info);
+  result = parser.ParseProgram(isolate, info);
+  info->set_literal(result);
+  parser.Internalize(isolate, info->script(), result == nullptr);
+  if (result != nullptr) {
+    info->set_language_mode(info->literal()->language_mode());
+  }
+  return (result != nullptr);
+}
+
+bool ParseFunction(ParseInfo* info) {
+  DCHECK(!info->is_toplevel());
+  DCHECK_NULL(info->literal());
+
+  Parser parser(info);
+
+  FunctionLiteral* result = nullptr;
+  // Ok to use Isolate here; this function is only called in the main thread.
+  DCHECK(parser.parsing_on_main_thread_);
+  Isolate* isolate = info->isolate();
+
+  result = parser.ParseFunction(isolate, info);
+  info->set_literal(result);
+  parser.Internalize(isolate, info->script(), result == nullptr);
+  return (result != nullptr);
+}
+
+bool ParseAny(ParseInfo* info) {
+  return info->is_toplevel() ? ParseProgram(info) : ParseFunction(info);
+}
+
+}  // namespace parsing
+}  // namespace internal
+}  // namespace v8