gin/gin_features.cc

// Copyright 2017 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 "gin/gin_features.h"
#include "base/metrics/field_trial_params.h"

namespace features {

// Enables optimization of JavaScript in V8.
const base::Feature kV8OptimizeJavascript{"V8OptimizeJavascript",
                                          base::FEATURE_ENABLED_BY_DEFAULT};

// Enables flushing of JS bytecode in V8.
const base::Feature kV8FlushBytecode{"V8FlushBytecode",
                                     base::FEATURE_ENABLED_BY_DEFAULT};

// Enables finalizing streaming JS compilations on a background thread.
const base::Feature kV8OffThreadFinalization{"V8OffThreadFinalization",
                                             base::FEATURE_ENABLED_BY_DEFAULT};

// Enables lazy feedback allocation in V8.
const base::Feature kV8LazyFeedbackAllocation{"V8LazyFeedbackAllocation",
                                              base::FEATURE_ENABLED_BY_DEFAULT};

// Enables concurrent inlining in TurboFan.
const base::Feature kV8ConcurrentInlining{"V8ConcurrentInlining",
                                          base::FEATURE_DISABLED_BY_DEFAULT};

// Enables per-context marking worklists in V8 GC.
const base::Feature kV8PerContextMarkingWorklist{
    "V8PerContextMarkingWorklist", base::FEATURE_DISABLED_BY_DEFAULT};

// Enables flushing of the instruction cache for the embedded blob.
const base::Feature kV8FlushEmbeddedBlobICache{
    "V8FlushEmbeddedBlobICache", base::FEATURE_DISABLED_BY_DEFAULT};

// Enables reduced number of concurrent marking tasks.
const base::Feature kV8ReduceConcurrentMarkingTasks{
    "V8ReduceConcurrentMarkingTasks", base::FEATURE_DISABLED_BY_DEFAULT};

// Disables reclaiming of unmodified wrappers objects.
const base::Feature kV8NoReclaimUnmodifiedWrappers{
    "V8NoReclaimUnmodifiedWrappers", base::FEATURE_DISABLED_BY_DEFAULT};

// Enables fallback to a breadth-first regexp engine on excessive backtracking.
const base::Feature kV8ExperimentalRegexpEngine{
    "V8ExperimentalRegexpEngine", base::FEATURE_ENABLED_BY_DEFAULT};

// Enables experimental Turboprop compiler.
const base::Feature kV8Turboprop{"V8Turboprop",
                                 base::FEATURE_DISABLED_BY_DEFAULT};

// Enables Sparkplug compiler. Note that this only sets the V8 flag when
// manually overridden; otherwise it defers to whatever the V8 default is.
const base::Feature kV8Sparkplug{"V8Sparkplug",
                                 base::FEATURE_ENABLED_BY_DEFAULT};

// Makes sure the experimental Sparkplug compiler is only enabled if short
// builtin calls are enabled too.
const base::Feature kV8SparkplugNeedsShortBuiltinCalls{
    "V8SparkplugNeedsShortBuiltinCalls", base::FEATURE_DISABLED_BY_DEFAULT};

// Enables short builtin calls feature.
const base::Feature kV8ShortBuiltinCalls{"V8ShortBuiltinCalls",
                                         base::FEATURE_ENABLED_BY_DEFAULT};

// Enables fast API calls in TurboFan.
const base::Feature kV8TurboFastApiCalls{"V8TurboFastApiCalls",
                                         base::FEATURE_DISABLED_BY_DEFAULT};

// Artificially delays script execution.
const base::Feature kV8ScriptAblation{"V8ScriptAblation",
                                      base::FEATURE_DISABLED_BY_DEFAULT};
const base::FeatureParam<int> kV8ScriptDelayOnceMs{&kV8ScriptAblation,
                                                   "V8ScriptDelayOnceMs", 0};
const base::FeatureParam<int> kV8ScriptDelayMs{&kV8ScriptAblation,
                                               "V8ScriptDelayMs", 0};
const base::FeatureParam<double> kV8ScriptDelayFraction{
    &kV8ScriptAblation, "V8ScriptDelayFraction", 0.0};

// Experiment to determine the maximum size of the ArrayBuffer cage.
const base::Feature kV8ArrayBufferCageReservationExperiment{
    "V8ArrayBufferCageReservationExperiment",
    base::FEATURE_DISABLED_BY_DEFAULT};

// Enables slow histograms that provide detailed information at increased
// runtime overheads.
const base::Feature kV8SlowHistograms{"V8SlowHistograms",
                                      base::FEATURE_DISABLED_BY_DEFAULT};

}  // namespace features