Revert "Record allocation stack traces".

src/allocation-tracker.cc

-// Copyright 2013 the V8 project authors. All rights reserved.
-// Redistribution and use in source and binary forms, with or without
-// modification, are permitted provided that the following conditions are
-// met:
-//
-//     * Redistributions of source code must retain the above copyright
-//       notice, this list of conditions and the following disclaimer.
-//     * Redistributions in binary form must reproduce the above
-//       copyright notice, this list of conditions and the following
-//       disclaimer in the documentation and/or other materials provided
-//       with the distribution.
-//     * Neither the name of Google Inc. nor the names of its
-//       contributors may be used to endorse or promote products derived
-//       from this software without specific prior written permission.
-//
-// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
-// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
-// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
-// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
-// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
-// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
-// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
-// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
-// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
-// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
-// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
-
-#include "v8.h"
-
-#include "allocation-tracker.h"
-
-#include "heap-snapshot-generator.h"
-#include "frames-inl.h"
-
-namespace v8 {
-namespace internal {
-
-AllocationTraceNode::AllocationTraceNode(
-    AllocationTraceTree* tree, SnapshotObjectId shared_function_info_id)
-    : tree_(tree),
-      function_id_(shared_function_info_id),
-      total_size_(0),
-      allocation_count_(0),
-      id_(tree->next_node_id()) {
-}
-
-
-AllocationTraceNode::~AllocationTraceNode() {
-}
-
-
-AllocationTraceNode* AllocationTraceNode::FindChild(SnapshotObjectId id) {
-  for (int i = 0; i < children_.length(); i++) {
-    AllocationTraceNode* node = children_[i];
-    if (node->function_id() == id) return node;
-  }
-  return NULL;
-}
-
-
-AllocationTraceNode* AllocationTraceNode::FindOrAddChild(SnapshotObjectId id) {
-  AllocationTraceNode* child = FindChild(id);
-  if (child == NULL) {
-    child = new AllocationTraceNode(tree_, id);
-    children_.Add(child);
-  }
-  return child;
-}
-
-
-void AllocationTraceNode::AddAllocation(unsigned size) {
-  total_size_ += size;
-  ++allocation_count_;
-}
-
-
-void AllocationTraceNode::Print(int indent, AllocationTracker* tracker) {
-  OS::Print("%10u %10u %*c", total_size_, allocation_count_, indent, ' ');
-  if (tracker != NULL) {
-    const char* name = "<unknown function>";
-    if (function_id_ != 0) {
-      AllocationTracker::FunctionInfo* info =
-          tracker->GetFunctionInfo(function_id_);
-      if (info != NULL) {
-        name = info->name;
-      }
-    }
-    OS::Print("%s #%u", name, id_);
-  } else {
-    OS::Print("%u #%u", function_id_, id_);
-  }
-  OS::Print("\n");
-  indent += 2;
-  for (int i = 0; i < children_.length(); i++) {
-    children_[i]->Print(indent, tracker);
-  }
-}
-
-
-AllocationTraceTree::AllocationTraceTree()
-    : next_node_id_(1),
-      root_(this, 0) {
-}
-
-
-AllocationTraceTree::~AllocationTraceTree() {
-}
-
-
-AllocationTraceNode* AllocationTraceTree::AddPathFromEnd(
-    const Vector<SnapshotObjectId>& path) {
-  AllocationTraceNode* node = root();
-  for (SnapshotObjectId* entry = path.start() + path.length() - 1;
-       entry != path.start() - 1;
-       --entry) {
-    node = node->FindOrAddChild(*entry);
-  }
-  return node;
-}
-
-
-void AllocationTraceTree::Print(AllocationTracker* tracker) {
-  OS::Print("[AllocationTraceTree:]\n");
-  OS::Print("Total size | Allocation count | Function id | id\n");
-  root()->Print(0, tracker);
-}
-
-void AllocationTracker::DeleteUnresolvedLocation(
-    UnresolvedLocation** location) {
-  delete *location;
-}
-
-
-AllocationTracker::FunctionInfo::FunctionInfo()
-    : name(""),
-      script_name(""),
-      script_id(0),
-      line(-1),
-      column(-1) {
-}
-
-
-static bool AddressesMatch(void* key1, void* key2) {
-  return key1 == key2;
-}
-
-
-AllocationTracker::AllocationTracker(
-    HeapObjectsMap* ids, StringsStorage* names)
-    : ids_(ids),
-      names_(names),
-      id_to_function_info_(AddressesMatch) {
-}
-
-
-AllocationTracker::~AllocationTracker() {
-  unresolved_locations_.Iterate(DeleteUnresolvedLocation);
-}
-
-
-void AllocationTracker::PrepareForSerialization() {
-  List<UnresolvedLocation*> copy(unresolved_locations_.length());
-  copy.AddAll(unresolved_locations_);
-  unresolved_locations_.Clear();
-  for (int i = 0; i < copy.length(); i++) {
-    copy[i]->Resolve();
-    delete copy[i];
-  }
-}
-
-
-void AllocationTracker::NewObjectEvent(Address addr, int size) {
-  DisallowHeapAllocation no_allocation;
-  Heap* heap = ids_->heap();
-
-  // Mark the new block as FreeSpace to make sure the heap is iterable
-  // while we are capturing stack trace.
-  FreeListNode::FromAddress(addr)->set_size(heap, size);
-  ASSERT_EQ(HeapObject::FromAddress(addr)->Size(), size);
-  ASSERT(FreeListNode::IsFreeListNode(HeapObject::FromAddress(addr)));
-
-  Isolate* isolate = heap->isolate();
-  int length = 0;
-  StackTraceFrameIterator it(isolate);
-  while (!it.done() && length < kMaxAllocationTraceLength) {
-    JavaScriptFrame* frame = it.frame();
-    SharedFunctionInfo* shared = frame->function()->shared();
-    SnapshotObjectId id = ids_->FindEntry(shared->address());
-    allocation_trace_buffer_[length++] = id;
-    AddFunctionInfo(shared, id);
-    it.Advance();
-  }
-  AllocationTraceNode* top_node = trace_tree_.AddPathFromEnd(
-      Vector<SnapshotObjectId>(allocation_trace_buffer_, length));
-  top_node->AddAllocation(size);
-}
-
-
-static uint32_t SnapshotObjectIdHash(SnapshotObjectId id) {
-  return ComputeIntegerHash(static_cast<uint32_t>(id),
-                            v8::internal::kZeroHashSeed);
-}
-
-
-AllocationTracker::FunctionInfo* AllocationTracker::GetFunctionInfo(
-    SnapshotObjectId id) {
-  HashMap::Entry* entry = id_to_function_info_.Lookup(
-      reinterpret_cast<void*>(id), SnapshotObjectIdHash(id), false);
-  if (entry == NULL) {
-    return NULL;
-  }
-  return reinterpret_cast<FunctionInfo*>(entry->value);
-}
-
-
-void AllocationTracker::AddFunctionInfo(SharedFunctionInfo* shared,
-                                        SnapshotObjectId id) {
-  HashMap::Entry* entry = id_to_function_info_.Lookup(
-      reinterpret_cast<void*>(id), SnapshotObjectIdHash(id), true);
-  if (entry->value == NULL) {
-    FunctionInfo* info = new FunctionInfo();
-    info->name = names_->GetFunctionName(shared->DebugName());
-    if (shared->script()->IsScript()) {
-      Script* script = Script::cast(shared->script());
-      if (script->name()->IsName()) {
-        Name* name = Name::cast(script->name());
-        info->script_name = names_->GetName(name);
-      }
-      info->script_id = script->id()->value();
-      // Converting start offset into line and column may cause heap
-      // allocations so we postpone them until snapshot serialization.
-      unresolved_locations_.Add(new UnresolvedLocation(
-          script,
-          shared->start_position(),
-          info));
-    }
-    entry->value = info;
-  }
-}
-
-
-AllocationTracker::UnresolvedLocation::UnresolvedLocation(
-    Script* script, int start, FunctionInfo* info)
-    : start_position_(start),
-      info_(info) {
-  script_ = Handle<Script>::cast(
-      script->GetIsolate()->global_handles()->Create(script));
-  GlobalHandles::MakeWeak(
-      reinterpret_cast<Object**>(script_.location()),
-      this, &HandleWeakScript);
-}
-
-
-AllocationTracker::UnresolvedLocation::~UnresolvedLocation() {
-  if (!script_.is_null()) {
-    script_->GetIsolate()->global_handles()->Destroy(
-        reinterpret_cast<Object**>(script_.location()));
-  }
-}
-
-
-void AllocationTracker::UnresolvedLocation::Resolve() {
-  if (script_.is_null()) return;
-  info_->line = GetScriptLineNumber(script_, start_position_);
-  info_->column = GetScriptColumnNumber(script_, start_position_);
-}
-
-
-void AllocationTracker::UnresolvedLocation::HandleWeakScript(
-    v8::Isolate* isolate,
-    v8::Persistent<v8::Value>* obj,
-    void* data) {
-  UnresolvedLocation* location = reinterpret_cast<UnresolvedLocation*>(data);
-  location->script_ = Handle<Script>::null();
-  obj->Dispose();
-}
-
-
-} }  // namespace v8::internal