[parser]: Skipping inner funcs / initial implemetation of storing scope analysis data from preparse…

src/parsing/preparsed-scope-data.cc

+// Copyright 2017 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/preparsed-scope-data.h"
+
+namespace v8 {
+namespace internal {
+
+PreParsedScopeData::ScopeScope::ScopeScope(PreParsedScopeData* data,
+                                           ScopeType scope_type,
+                                           int start_position, int end_position)
+    : data_(data),
+      previous_scope_(data->current_scope_),
+      inner_scope_count_(0),
+      variable_count_(0) {
+  data->current_scope_ = this;
+  if (previous_scope_ != nullptr) {
+    ++previous_scope_->inner_scope_count_;
+  }
+
+  data->backing_store_.push_back(scope_type);
+  data->backing_store_.push_back(start_position);
+  data->backing_store_.push_back(end_position);
+  // Reserve space for variable and inner scope count (we don't know yet how
+  // many will be added).
+  index_in_data_ = data->backing_store_.size();
+  data->backing_store_.push_back(-1);
+  data->backing_store_.push_back(-1);
+}
+
+PreParsedScopeData::ScopeScope::~ScopeScope() {
+  data_->current_scope_ = previous_scope_;
+  data_->backing_store_[index_in_data_] = inner_scope_count_;
+  data_->backing_store_[index_in_data_ + 1] = variable_count_;
+}
+
+}  // namespace internal
+}  // namespace v8