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// Copyright 2020 The Chromium Authors. All rights reserved.
// 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/measure_memory/measure_memory_controller.h"
#include "third_party/blink/renderer/core/timing/measure_memory/measure_memory_delegate.h"
#include "third_party/blink/public/platform/platform.h"
#include "third_party/blink/renderer/bindings/core/v8/script_promise.h"
#include "third_party/blink/renderer/bindings/core/v8/to_v8_for_core.h"
#include "third_party/blink/renderer/bindings/core/v8/v8_measure_memory.h"
#include "third_party/blink/renderer/bindings/core/v8/v8_measure_memory_breakdown.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/frame/local_frame.h"
#include "third_party/blink/renderer/platform/bindings/exception_state.h"
#include "third_party/blink/renderer/platform/bindings/script_state.h"
#include "third_party/blink/renderer/platform/heap/heap.h"
#include "third_party/blink/renderer/platform/heap/heap_allocator.h"
#include "third_party/blink/renderer/platform/heap/member.h"
#include "third_party/blink/renderer/platform/heap/persistent.h"
#include "third_party/blink/renderer/platform/runtime_enabled_features.h"
#include "third_party/blink/renderer/platform/wtf/functional.h"
#include "v8/include/v8.h"
namespace blink {
static MeasureMemoryController::V8MemoryReporter*
g_dedicated_worker_memory_reporter_ = nullptr;
void MeasureMemoryController::SetDedicatedWorkerMemoryReporter(
V8MemoryReporter* reporter) {
g_dedicated_worker_memory_reporter_ = reporter;
}
MeasureMemoryController::MeasureMemoryController(
util::PassKey<MeasureMemoryController>,
v8::Isolate* isolate,
v8::Local<v8::Context> context,
v8::Local<v8::Promise::Resolver> promise_resolver)
: isolate_(isolate),
context_(isolate, context),
promise_resolver_(isolate, promise_resolver) {
context_.SetPhantom();
// TODO(ulan): Currently we keep a strong reference to the promise resolver.
// This may prolong the lifetime of the context by one more GC in the worst
// case as JSPromise keeps its context alive.
// To avoid that we should use an ephemeron context_ => promise_resolver_.
}
void MeasureMemoryController::Trace(Visitor* visitor) const {
visitor->Trace(promise_resolver_);
visitor->Trace(main_result_);
visitor->Trace(worker_result_);
}
ScriptPromise MeasureMemoryController::StartMeasurement(
ScriptState* script_state,
ExceptionState& exception_state) {
if (!IsMeasureMemoryAvailable(LocalDOMWindow::From(script_state))) {
exception_state.ThrowSecurityError(
"performance.measureMemory is not available in this context");
return ScriptPromise();
}
v8::Isolate* isolate = script_state->GetIsolate();
v8::TryCatch try_catch(isolate);
v8::Local<v8::Context> context = script_state->GetContext();
v8::Local<v8::Promise::Resolver> promise_resolver;
if (!v8::Promise::Resolver::New(context).ToLocal(&promise_resolver)) {
exception_state.RethrowV8Exception(try_catch.Exception());
return ScriptPromise();
}
v8::MeasureMemoryExecution execution =
RuntimeEnabledFeatures::ForceEagerMeasureMemoryEnabled(
ExecutionContext::From(script_state))
? v8::MeasureMemoryExecution::kEager
: v8::MeasureMemoryExecution::kDefault;
auto* impl = MakeGarbageCollected<MeasureMemoryController>(
util::PassKey<MeasureMemoryController>(), isolate, context,
promise_resolver);
isolate->MeasureMemory(
std::make_unique<MeasureMemoryDelegate>(
isolate, context,
WTF::Bind(&MeasureMemoryController::MainMeasurementComplete,
WrapPersistent(impl))),
execution);
if (g_dedicated_worker_memory_reporter_) {
g_dedicated_worker_memory_reporter_->GetMemoryUsage(
WTF::Bind(&MeasureMemoryController::WorkerMeasurementComplete,
WrapPersistent(impl)),
execution);
} else {
HeapVector<Member<MeasureMemoryBreakdown>> result;
impl->WorkerMeasurementComplete(result);
}
return ScriptPromise(script_state, promise_resolver->GetPromise());
}
bool MeasureMemoryController::IsMeasureMemoryAvailable(LocalDOMWindow* window) {
// TODO(ulan): We should check for window.crossOriginIsolated when it ships.
// Until then we enable the API only for processes locked to a site
// similar to the precise mode of the legacy performance.memory API.
if (!Platform::Current()->IsLockedToSite()) {
return false;
}
// The window.crossOriginIsolated will be true only for the top-level frame.
// Until the flag is available we check for the top-level condition manually.
if (!window) {
return false;
}
LocalFrame* local_frame = window->GetFrame();
if (!local_frame || !local_frame->IsMainFrame()) {
return false;
}
return true;
}
void MeasureMemoryController::MainMeasurementComplete(Result result) {
DCHECK(!main_measurement_completed_);
main_result_ = result;
main_measurement_completed_ = true;
MaybeResolvePromise();
}
void MeasureMemoryController::WorkerMeasurementComplete(Result result) {
DCHECK(!worker_measurement_completed_);
worker_result_ = result;
worker_measurement_completed_ = true;
MaybeResolvePromise();
}
void MeasureMemoryController::MaybeResolvePromise() {
if (!main_measurement_completed_ || !worker_measurement_completed_) {
// Wait until we have all results.
return;
}
if (context_.IsEmpty()) {
// The context was garbage collected in the meantime.
return;
}
v8::HandleScope handle_scope(isolate_);
v8::Local<v8::Context> context = context_.NewLocal(isolate_);
v8::Context::Scope context_scope(context);
MeasureMemory* result = MeasureMemory::Create();
auto breakdown = main_result_;
breakdown.AppendVector(worker_result_);
size_t total_size = 0;
for (auto entry : breakdown) {
total_size += entry->bytes();
}
result->setBytes(total_size);
result->setBreakdown(breakdown);
v8::Local<v8::Promise::Resolver> promise_resolver =
promise_resolver_.NewLocal(isolate_);
promise_resolver->Resolve(context, ToV8(result, promise_resolver, isolate_))
.ToChecked();
promise_resolver_.Clear();
}
} // namespace blink
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