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Ideally we'd trace VM operations from inside the VM, but we don't yet have DartVM wired into tracing. Instead, we use these GC hooks to trace how long major GC takes. R=rafaelw@chromium.org Review URL: https://codereview.chromium.org/1031083003
54 lines
1.4 KiB
C++
54 lines
1.4 KiB
C++
// Copyright 2015 The Chromium Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style license that can be
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// found in the LICENSE file.
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#include "sky/engine/config.h"
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#include "sky/engine/tonic/dart_gc_controller.h"
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#include "base/trace_event/trace_event.h"
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#include "dart/runtime/include/dart_api.h"
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#include "sky/engine/tonic/dart_gc_context.h"
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#include "sky/engine/tonic/dart_gc_visitor.h"
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#include "sky/engine/tonic/dart_wrappable.h"
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namespace blink {
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namespace {
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DartGCContext* g_gc_context = nullptr;
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DartWrappable* GetWrappable(intptr_t* fields) {
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return reinterpret_cast<DartWrappable*>(fields[DartWrappable::kPeerIndex]);
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}
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void Visit(void* isolate_callback_data,
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Dart_WeakPersistentHandle handle,
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intptr_t native_field_count,
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intptr_t* native_fields) {
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if (!native_field_count)
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return;
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DCHECK(native_field_count == DartWrappable::kNumberOfNativeFields);
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DartGCVisitor visitor(g_gc_context);
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GetWrappable(native_fields)->AcceptDartGCVisitor(visitor);
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}
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} // namespace
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void DartGCPrologue() {
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TRACE_EVENT_ASYNC_BEGIN0("sky", "DartGC", 0);
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Dart_EnterScope();
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DCHECK(!g_gc_context);
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g_gc_context = new DartGCContext();
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Dart_VisitPrologueWeakHandles(Visit);
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}
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void DartGCEpilogue() {
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delete g_gc_context;
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g_gc_context = nullptr;
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Dart_ExitScope();
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TRACE_EVENT_ASYNC_END0("sky", "DartGC", 0);
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}
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} // namespace blink
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