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// Copyright 2016 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#ifndef BASE_TRACE_EVENT_HEAP_PROFILER_H_
#define BASE_TRACE_EVENT_HEAP_PROFILER_H_
#include "base/compiler_specific.h"
#include "base/trace_event/heap_profiler_allocation_context_tracker.h"
// This header file defines the set of macros that are used to track memory
// usage in the heap profiler. This is in addition to the macros defined in
// trace_event.h and are specific to heap profiler. This file also defines
// implementation details of these macros.
// Scoped tracker for task execution context in the heap profiler.
#define TRACE_HEAP_PROFILER_API_SCOPED_TASK_EXECUTION \
trace_event_internal::HeapProfilerScopedTaskExecutionTracker
// Returns the current task context (c-string) tracked by heap profiler. This is
// useful along with TRACE_HEAP_PROFILER_API_SCOPED_TASK_EXECUTION if a async
// system needs to track client's allocation context across post tasks. Use this
// macro to get the current context and use
// TRACE_HEAP_PROFILER_API_SCOPED_TASK_EXECUTION in the posted task which
// allocates memory for a client.
#define TRACE_HEAP_PROFILER_API_GET_CURRENT_TASK_CONTEXT \
trace_event_internal::HeapProfilerCurrentTaskContext
// A scoped ignore event used to tell heap profiler to ignore all the
// allocations in the scope. It is useful to exclude allocations made for
// tracing from the heap profiler dumps.
// TODO(https://crbug.com/1378619): This is a no-op since
// AllocationContextTracker::GetContextSnapshot was removed. Clean up the call
// sites.
#define HEAP_PROFILER_SCOPED_IGNORE ((void)0)
namespace trace_event_internal {
// HeapProfilerScopedTaskExecutionTracker records the current task's context in
// the heap profiler.
class HeapProfilerScopedTaskExecutionTracker {
public:
inline explicit HeapProfilerScopedTaskExecutionTracker(
const char* task_context)
: context_(task_context) {
using base::trace_event::AllocationContextTracker;
if (UNLIKELY(AllocationContextTracker::capture_mode() !=
AllocationContextTracker::CaptureMode::kDisabled)) {
AllocationContextTracker::GetInstanceForCurrentThread()
->PushCurrentTaskContext(context_);
}
}
inline ~HeapProfilerScopedTaskExecutionTracker() {
using base::trace_event::AllocationContextTracker;
if (UNLIKELY(AllocationContextTracker::capture_mode() !=
AllocationContextTracker::CaptureMode::kDisabled)) {
AllocationContextTracker::GetInstanceForCurrentThread()
->PopCurrentTaskContext(context_);
}
}
private:
const char* context_;
};
inline const char* HeapProfilerCurrentTaskContext() {
return base::trace_event::AllocationContextTracker::
GetInstanceForCurrentThread()
->TaskContext();
}
} // namespace trace_event_internal
#endif // BASE_TRACE_EVENT_HEAP_PROFILER_H_
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