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      1 // Copyright 2013 the V8 project authors. All rights reserved.
      2 // Use of this source code is governed by a BSD-style license that can be
      3 // found in the LICENSE file.
      4 
      5 #ifndef V8_HEAP_SNAPSHOT_GENERATOR_INL_H_
      6 #define V8_HEAP_SNAPSHOT_GENERATOR_INL_H_
      7 
      8 #include "src/heap-snapshot-generator.h"
      9 
     10 namespace v8 {
     11 namespace internal {
     12 
     13 
     14 HeapEntry* HeapGraphEdge::from() const {
     15   return &snapshot()->entries()[from_index_];
     16 }
     17 
     18 
     19 HeapSnapshot* HeapGraphEdge::snapshot() const {
     20   return to_entry_->snapshot();
     21 }
     22 
     23 
     24 int HeapEntry::index() const {
     25   return static_cast<int>(this - &snapshot_->entries().first());
     26 }
     27 
     28 
     29 int HeapEntry::set_children_index(int index) {
     30   children_index_ = index;
     31   int next_index = index + children_count_;
     32   children_count_ = 0;
     33   return next_index;
     34 }
     35 
     36 
     37 HeapGraphEdge** HeapEntry::children_arr() {
     38   ASSERT(children_index_ >= 0);
     39   SLOW_ASSERT(children_index_ < snapshot_->children().length() ||
     40       (children_index_ == snapshot_->children().length() &&
     41        children_count_ == 0));
     42   return &snapshot_->children().first() + children_index_;
     43 }
     44 
     45 
     46 SnapshotObjectId HeapObjectsMap::GetNthGcSubrootId(int delta) {
     47   return kGcRootsFirstSubrootId + delta * kObjectIdStep;
     48 }
     49 
     50 
     51 HeapObject* V8HeapExplorer::GetNthGcSubrootObject(int delta) {
     52   return reinterpret_cast<HeapObject*>(
     53       reinterpret_cast<char*>(kFirstGcSubrootObject) +
     54       delta * HeapObjectsMap::kObjectIdStep);
     55 }
     56 
     57 
     58 int V8HeapExplorer::GetGcSubrootOrder(HeapObject* subroot) {
     59   return static_cast<int>(
     60       (reinterpret_cast<char*>(subroot) -
     61        reinterpret_cast<char*>(kFirstGcSubrootObject)) /
     62       HeapObjectsMap::kObjectIdStep);
     63 }
     64 
     65 } }  // namespace v8::internal
     66 
     67 #endif  // V8_HEAP_SNAPSHOT_GENERATOR_INL_H_
     68