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// Copyright 2019 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "third_party/blink/renderer/core/timing/profiler.h"
#include "third_party/blink/renderer/bindings/core/v8/script_promise_resolver.h"
#include "third_party/blink/renderer/core/dom/dom_exception.h"
#include "third_party/blink/renderer/core/event_target_names.h"
#include "third_party/blink/renderer/core/execution_context/execution_context.h"
#include "third_party/blink/renderer/core/frame/local_dom_window.h"
#include "third_party/blink/renderer/core/timing/dom_window_performance.h"
#include "third_party/blink/renderer/core/timing/profiler_group.h"
#include "third_party/blink/renderer/platform/bindings/script_forbidden_scope.h"
namespace blink {
Profiler* Profiler::Create(ScriptState* script_state,
const ProfilerInitOptions* options,
ExceptionState& exception_state) {
auto* execution_context = ExecutionContext::From(script_state);
DCHECK(execution_context);
Performance* performance = nullptr;
bool can_profile = false;
if (LocalDOMWindow* window = LocalDOMWindow::From(script_state)) {
can_profile = ProfilerGroup::CanProfile(window, &exception_state,
ReportOptions::kReportOnFailure);
performance = DOMWindowPerformance::performance(*window);
}
if (!can_profile) {
DCHECK(exception_state.HadException());
return nullptr;
}
DCHECK(performance);
auto* profiler_group = ProfilerGroup::From(script_state->GetIsolate());
DCHECK(profiler_group);
auto* profiler = profiler_group->CreateProfiler(
script_state, *options, performance->GetTimeOriginInternal(),
exception_state);
if (exception_state.HadException())
return nullptr;
return profiler;
}
void Profiler::Trace(Visitor* visitor) const {
visitor->Trace(profiler_group_);
visitor->Trace(script_state_);
EventTarget::Trace(visitor);
}
void Profiler::DisposeAsync() {
if (profiler_group_) {
// It's safe to touch |profiler_group_| in Profiler's pre-finalizer as
// |profiler_group_| is guaranteed to outlive the Profiler, if set. This is
// due to ProfilerGroup nulling out this field for all attached Profilers
// prior to destruction.
profiler_group_->CancelProfilerAsync(script_state_, this);
profiler_group_ = nullptr;
}
}
const AtomicString& Profiler::InterfaceName() const {
return event_target_names::kProfiler;
}
ExecutionContext* Profiler::GetExecutionContext() const {
return ExecutionContext::From(script_state_);
}
ScriptPromise<ProfilerTrace> Profiler::stop(ScriptState* script_state) {
auto* resolver =
MakeGarbageCollected<ScriptPromiseResolver<ProfilerTrace>>(script_state);
auto promise = resolver->Promise();
if (!stopped()) {
// Ensure that we don't synchronously invoke script when resolving
// (crbug.com/1119865).
ScriptForbiddenScope forbid_script;
DCHECK(profiler_group_);
profiler_group_->StopProfiler(script_state, this, resolver);
profiler_group_ = nullptr;
} else {
resolver->Reject(MakeGarbageCollected<DOMException>(
DOMExceptionCode::kInvalidStateError, "Profiler already stopped."));
}
return promise;
}
} // namespace blink
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