Track JS allocations as they arrive with no affection on performance when tracking is switched off

src/heap-profiler.cc

 // Copyright 2009-2010 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 "deoptimizer.h"
 #include "heap-profiler.h"
 #include "heap-snapshot-generator-inl.h"
 
 namespace v8 {
 namespace internal {
 
 HeapProfiler::HeapProfiler(Heap* heap)
     : snapshots_(new HeapSnapshotsCollection(heap)),
-      next_snapshot_uid_(1) {
+      next_snapshot_uid_(1),
+      is_tracking_allocations_(false) {
 }
 
 
 HeapProfiler::~HeapProfiler() {
   delete snapshots_;
 }
 
 
 void HeapProfiler::DeleteAllSnapshots() {
   Heap* the_heap = heap();
@@ skipping 76 matching lines @@
 }
 
 
 SnapshotObjectId HeapProfiler::GetSnapshotObjectId(Handle<Object> obj) {
   if (!obj->IsHeapObject())
     return v8::HeapProfiler::kUnknownObjectId;
   return snapshots_->FindObjectId(HeapObject::cast(*obj)->address());
 }
 
 
-void HeapProfiler::ObjectMoveEvent(Address from, Address to) {
-  snapshots_->ObjectMoveEvent(from, to);
+void HeapProfiler::ObjectMoveEvent(Address from, Address to, int size) {
+  snapshots_->ObjectMoveEvent(from, to, size);
 }
 
+
+void HeapProfiler::NewObjectEvent(Address addr, int size) {
+  snapshots_->NewObjectEvent(addr, size);
+}
+
+
+void HeapProfiler::UpdateObjectSizeEvent(Address addr, int size) {
+  snapshots_->UpdateObjectSizeEvent(addr, size);
+}
+
+
 void HeapProfiler::SetRetainedObjectInfo(UniqueId id,
                                          RetainedObjectInfo* info) {
   // TODO(yurus, marja): Don't route this information through GlobalHandles.
   heap()->isolate()->global_handles()->SetRetainedObjectInfo(id, info);
 }
 
+
+void HeapProfiler::StartHeapAllocationsRecording() {
+  StartHeapObjectsTracking();
+  is_tracking_allocations_ = true;
+  UpdateMap();
+  DropCompiledCode();
+}
+
+
+void HeapProfiler::StopHeapAllocationsRecording() {
+  StopHeapObjectsTracking();
+  is_tracking_allocations_ = false;
+  DropCompiledCode();
+}
+
+
+void HeapProfiler::RecordObjectAllocationFromMasm(Isolate* isolate,
+                                                  Address obj,
+                                                  int size) {
+  isolate->heap_profiler()->NewObjectEvent(obj, size);
+}
+
+
+void HeapProfiler::DropCompiledCode() {
+  Heap* heap_ = heap();
+  Isolate* isolate = heap_->isolate();
+  HandleScope scope(isolate);
+
+  if (FLAG_concurrent_recompilation) {
+    isolate->optimizing_compiler_thread()->Flush();
+  }
+
+  Deoptimizer::DeoptimizeAll(isolate);
+
+  Handle<Code> lazy_compile =
+    Handle<Code>(isolate->builtins()->builtin(Builtins::kLazyCompile));
+
+  heap_->CollectAllGarbage(Heap::kMakeHeapIterableMask,
+                          "switch allocations tracking");
+
+  DisallowHeapAllocation no_allocation;
+
+  HeapIterator iterator(heap_);
+  HeapObject* obj = NULL;
+  while (((obj = iterator.next()) != NULL)) {
+    if (obj->IsJSFunction()) {
+      JSFunction* function = JSFunction::cast(obj);
+      SharedFunctionInfo* shared = function->shared();
+
+      if (!shared->allows_lazy_compilation()) continue;
+      if (!shared->script()->IsScript()) continue;
+
+      Code::Kind kind = function->code()->kind();
+      if (kind == Code::FUNCTION || kind == Code::BUILTIN) {
+        function->set_code(*lazy_compile);
+        shared->set_code(*lazy_compile);
+      }
+    }
+  }
+}
+
+
 } }  // namespace v8::internal