gin_features.cc | Explore in Territory

// Copyright 2017 The Chromium Authors
// 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 {

// Enable code space compaction when finalizing a full GC with stack.
BASE_FEATURE(…);

// Enable compaction when finalizing a full GC with stack.
BASE_FEATURE(…);

// Decommit (rather than discard) pooled pages.
BASE_FEATURE(…);

// Enables optimization of JavaScript in V8.
BASE_FEATURE(…);

// Enables flushing of JS bytecode in V8.
BASE_FEATURE(…);
const base::FeatureParam<int> kV8FlushBytecodeOldAge{ … };

// Enables flushing of baseline code in V8.
BASE_FEATURE(…);

// Enables code flushing based on tab visibility.
BASE_FEATURE(…);

// Enables code flushing based on time.
BASE_FEATURE(…);
const base::FeatureParam<int> kV8FlushCodeOldTime{ … };

// Enables finalizing streaming JS compilations on a background thread.
BASE_FEATURE(…);

// Enables lazy feedback allocation in V8.
BASE_FEATURE(…);

// Enables per-context marking worklists in V8 GC.
BASE_FEATURE(…);

// Enables flushing of the instruction cache for the embedded blob.
BASE_FEATURE(…);

// Enables reduced number of concurrent marking tasks.
BASE_FEATURE(…);

// Disables reclaiming of unmodified wrappers objects.
BASE_FEATURE(…);

// Enables W^X code memory protection in V8.
// This is enabled in V8 by default. To test the performance impact, we are
// going to disable this feature in a finch experiment.
BASE_FEATURE(…);

// Enables fallback to a breadth-first regexp engine on excessive backtracking.
BASE_FEATURE(…);

// Enables the Turbofan compiler.
BASE_FEATURE(…);

// Enables Turbofan's new compiler IR Turboshaft.
BASE_FEATURE(…);

// Enable running instruction selection on Turboshaft IR directly.
BASE_FEATURE(…);

// Enables Maglev compiler. Note that this only sets the V8 flag when
// manually overridden; otherwise it defers to whatever the V8 default is.
BASE_FEATURE(…);
BASE_FEATURE(…);

BASE_FEATURE(…);

const base::FeatureParam<int> kV8MemoryReducerGCCount{ … };

// Enables MinorMC young generation garbage collector.
BASE_FEATURE(…);

BASE_FEATURE(…);

const base::FeatureParam<int> kV8ScavengerMaxCapacity{ … };

// Enables Sparkplug compiler. Note that this only sets the V8 flag when
// manually overridden; otherwise it defers to whatever the V8 default is.
BASE_FEATURE(…);

// Enables the concurrent Sparkplug compiler.
BASE_FEATURE(…);
const base::FeatureParam<int> kV8ConcurrentSparkplugMaxThreads{ … };
BASE_FEATURE(…);
// Makes sure the experimental Sparkplug compiler is only enabled if short
// builtin calls are enabled too.
BASE_FEATURE(…);

// Enables batch compilation for Sparkplug (baseline) compilation.
BASE_FEATURE(…);

// Enables short builtin calls feature.
BASE_FEATURE(…);

// Enables fast API calls in TurboFan.
BASE_FEATURE(…);

// Enables faster DOM methods for megamorphic ICs
BASE_FEATURE(…);

// Faster object cloning
BASE_FEATURE(…);

// Avoids background threads for GC if isolate is in background.
BASE_FEATURE(…);

BASE_FEATURE(…);

BASE_FEATURE(…);

// Use V8 efficiency mode for tiering decisions.
BASE_FEATURE(…);
const base::FeatureParam<int> kV8EfficiencyModeTieringDelayTurbofan{ … };

// Enables slow histograms that provide detailed information at increased
// runtime overheads.
BASE_FEATURE(…);
// Multiple finch experiments might use slow-histograms. We introduce
// separate feature flags to circumvent finch limitations.
BASE_FEATURE(…);
BASE_FEATURE(…);
BASE_FEATURE(…);
BASE_FEATURE(…);
BASE_FEATURE(…);

// Enable 16GB heap reservation for Oilpan.
BASE_FEATURE(…);

BASE_FEATURE(…);
const base::FeatureParam<base::TimeDelta> kV8MemoryReducerStartDelay{ … };

BASE_FEATURE(…);

BASE_FEATURE(…);

BASE_FEATURE(…);

BASE_FEATURE(…);

BASE_FEATURE(…);

BASE_FEATURE(…);

BASE_FEATURE(…);

// Elide redundant TDZ hole checks in bytecode. This only sets the V8 flag when
// manually overridden.
BASE_FEATURE(…);

// Add additional alignment for some jumps in generated x64 code, to mitigate
// the performance impact of the Intel JCC erratum (https://crbug.com/v8/14225).
// Currently disabled by default in V8, but adding here temporarily to test
// real-world performance impact via a Finch experiment.
BASE_FEATURE(…);

// JavaScript language features.

// Enables the experiment with compile hints as magic comments.
BASE_FEATURE(…);

// Enables the iterator helpers proposal.
BASE_FEATURE(…);

// Enables the Promise.withResolvers proposal.
BASE_FEATURE(…);

// Enables the RegExp modifiers proposal.
BASE_FEATURE(…);

// Enables the `with` syntax for the Import Attributes proposal.
BASE_FEATURE(…);

// Enables the set methods proposal.
BASE_FEATURE(…);

// Enables the RegExp duplicate named capture groups proposal.
BASE_FEATURE(…);

// Enables the Promise.try proposal.
BASE_FEATURE(…);

// WebAssembly features.

// Enable WebAssembly deoptimization support (not user visible), see
// https://crbug.com/42204618.
BASE_FEATURE(…);

// Enable WebAssembly inlining (not user visible).
BASE_FEATURE(…);

// Feature for WebAssembly speculative inlining of indirect calls (see
// https://crbug.com/335082212; and https://crbug.com/40898108 for direct call
// and call_ref inlining, which has already launched above). Not user visible.
BASE_FEATURE(…);

// Enable WebAssembly code flushing.
BASE_FEATURE(…);

// Enable the generic wasm-to-js wrapper.
BASE_FEATURE(…);

// Enable support for multiple memories according to the multi-memory proposal:
// https://github.com/WebAssembly/multi-memory. See
// https://chromestatus.com/feature/5106389887746048.
BASE_FEATURE(…);

BASE_FEATURE(…);

BASE_FEATURE(…);

// Feature for more aggressive code caching (https://crbug.com/v8/14411,
// https://crbug.com/40945417) and three parameters to control caching behavior.
BASE_FEATURE(…);
const base::FeatureParam<int> kWebAssemblyMoreAggressiveCodeCachingThreshold{ … };
const base::FeatureParam<int> kWebAssemblyMoreAggressiveCodeCachingTimeoutMs{ … };
const base::FeatureParam<int>
    kWebAssemblyMoreAggressiveCodeCachingHardThreshold{ … };

}  // namespace features
chromium/gin/gin_features.cc
