| // 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(kV8CompactCodeSpaceWithStack, |
| "V8CompactCodeSpaceWithStack", |
| base::FEATURE_ENABLED_BY_DEFAULT); |
| |
| // Enable compaction when finalizing a full GC with stack. |
| BASE_FEATURE(kV8CompactWithStack, |
| "V8CompactWithStack", |
| base::FEATURE_ENABLED_BY_DEFAULT); |
| |
| // Enables optimization of JavaScript in V8. |
| BASE_FEATURE(kV8OptimizeJavascript, |
| "V8OptimizeJavascript", |
| base::FEATURE_ENABLED_BY_DEFAULT); |
| |
| // Enables flushing of JS bytecode in V8. |
| BASE_FEATURE(kV8FlushBytecode, |
| "V8FlushBytecode", |
| base::FEATURE_ENABLED_BY_DEFAULT); |
| const base::FeatureParam<int> kV8FlushBytecodeOldAge{ |
| &kV8FlushBytecode, "V8FlushBytecodeOldAge", 5}; |
| |
| // Enables flushing of baseline code in V8. |
| BASE_FEATURE(kV8FlushBaselineCode, |
| "V8FlushBaselineCode", |
| base::FEATURE_DISABLED_BY_DEFAULT); |
| |
| // Enables code flushing based on tab visibility. |
| BASE_FEATURE(kV8FlushCodeBasedOnTabVisibility, |
| "V8FlushCodeBasedOnTabVisibility", |
| base::FEATURE_DISABLED_BY_DEFAULT); |
| |
| // Enables code flushing based on time. |
| BASE_FEATURE(kV8FlushCodeBasedOnTime, |
| "V8FlushCodeBasedOnTime", |
| base::FEATURE_DISABLED_BY_DEFAULT); |
| const base::FeatureParam<int> kV8FlushCodeOldTime{&kV8FlushCodeBasedOnTime, |
| "V8FlushCodeOldTime", 30}; |
| |
| // Enables finalizing streaming JS compilations on a background thread. |
| BASE_FEATURE(kV8OffThreadFinalization, |
| "V8OffThreadFinalization", |
| base::FEATURE_ENABLED_BY_DEFAULT); |
| |
| // Enables lazy feedback allocation in V8. |
| BASE_FEATURE(kV8LazyFeedbackAllocation, |
| "V8LazyFeedbackAllocation", |
| base::FEATURE_ENABLED_BY_DEFAULT); |
| |
| // Enables per-context marking worklists in V8 GC. |
| BASE_FEATURE(kV8PerContextMarkingWorklist, |
| "V8PerContextMarkingWorklist", |
| base::FEATURE_DISABLED_BY_DEFAULT); |
| |
| // Enables flushing of the instruction cache for the embedded blob. |
| BASE_FEATURE(kV8FlushEmbeddedBlobICache, |
| "V8FlushEmbeddedBlobICache", |
| base::FEATURE_DISABLED_BY_DEFAULT); |
| |
| // Enables reduced number of concurrent marking tasks. |
| BASE_FEATURE(kV8ReduceConcurrentMarkingTasks, |
| "V8ReduceConcurrentMarkingTasks", |
| base::FEATURE_DISABLED_BY_DEFAULT); |
| |
| // Disables reclaiming of unmodified wrappers objects. |
| BASE_FEATURE(kV8NoReclaimUnmodifiedWrappers, |
| "V8NoReclaimUnmodifiedWrappers", |
| base::FEATURE_DISABLED_BY_DEFAULT); |
| |
| // 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(kV8CodeMemoryWriteProtection, |
| "V8CodeMemoryWriteProtection", |
| base::FEATURE_ENABLED_BY_DEFAULT); |
| |
| // Enables fallback to a breadth-first regexp engine on excessive backtracking. |
| BASE_FEATURE(kV8ExperimentalRegexpEngine, |
| "V8ExperimentalRegexpEngine", |
| base::FEATURE_ENABLED_BY_DEFAULT); |
| |
| // Enables the Turbofan compiler. |
| BASE_FEATURE(kV8Turbofan, "V8Turbofan", base::FEATURE_ENABLED_BY_DEFAULT); |
| |
| // Enables Turbofan's new compiler IR Turboshaft. |
| BASE_FEATURE(kV8Turboshaft, "V8Turboshaft", base::FEATURE_ENABLED_BY_DEFAULT); |
| |
| // Enable running instruction selection on Turboshaft IR directly. |
| BASE_FEATURE(kV8TurboshaftInstructionSelection, |
| "V8TurboshaftInstructionSelection", |
| base::FEATURE_DISABLED_BY_DEFAULT); |
| |
| // 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(kV8Maglev, "V8Maglev", base::FEATURE_ENABLED_BY_DEFAULT); |
| |
| BASE_FEATURE(kV8MemoryReducer, |
| "V8MemoryReducer", |
| base::FEATURE_DISABLED_BY_DEFAULT); |
| |
| const base::FeatureParam<int> kV8MemoryReducerGCCount{ |
| &kV8MemoryReducer, "V8MemoryReducerGCCount", 3}; |
| |
| // Enables MinorMC young generation garbage collector. |
| BASE_FEATURE(kV8MinorMS, "V8MinorMS", 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. |
| BASE_FEATURE(kV8Sparkplug, "V8Sparkplug", base::FEATURE_ENABLED_BY_DEFAULT); |
| |
| // Enables the concurrent Sparkplug compiler. |
| BASE_FEATURE(kV8ConcurrentSparkplug, |
| "V8ConcurrentSparkplug", |
| base::FEATURE_DISABLED_BY_DEFAULT); |
| const base::FeatureParam<int> kV8ConcurrentSparkplugMaxThreads{ |
| &kV8ConcurrentSparkplug, "V8ConcurrentSparkplugMaxThreads", 0}; |
| BASE_FEATURE(kV8ConcurrentSparkplugHighPriorityThreads, |
| "V8ConcurrentSparkplugHighPriorityThreads", |
| base::FEATURE_DISABLED_BY_DEFAULT); |
| // Makes sure the experimental Sparkplug compiler is only enabled if short |
| // builtin calls are enabled too. |
| BASE_FEATURE(kV8SparkplugNeedsShortBuiltinCalls, |
| "V8SparkplugNeedsShortBuiltinCalls", |
| base::FEATURE_DISABLED_BY_DEFAULT); |
| |
| // Enables short builtin calls feature. |
| BASE_FEATURE(kV8ShortBuiltinCalls, |
| "V8ShortBuiltinCalls", |
| base::FEATURE_ENABLED_BY_DEFAULT); |
| |
| // Enables fast API calls in TurboFan. |
| BASE_FEATURE(kV8TurboFastApiCalls, |
| "V8TurboFastApiCalls", |
| base::FEATURE_ENABLED_BY_DEFAULT); |
| |
| // Enables faster DOM methods for megamorphic ICs |
| BASE_FEATURE(kV8MegaDomIC, "V8MegaDomIC", base::FEATURE_DISABLED_BY_DEFAULT); |
| |
| // Avoids background threads for GC if isolate is in background. |
| BASE_FEATURE(kV8SingleThreadedGCInBackground, |
| "V8SingleThreadedGCInBackground", |
| base::FEATURE_DISABLED_BY_DEFAULT); |
| |
| // Enables slow histograms that provide detailed information at increased |
| // runtime overheads. |
| BASE_FEATURE(kV8SlowHistograms, |
| "V8SlowHistograms", |
| base::FEATURE_DISABLED_BY_DEFAULT); |
| // Multiple finch experiments might use slow-histograms. We introduce |
| // separate feature flags to circumvent finch limitations. |
| BASE_FEATURE(kV8SlowHistogramsCodeMemoryWriteProtection, |
| "V8SlowHistogramsCodeMemoryWriteProtection", |
| base::FEATURE_DISABLED_BY_DEFAULT); |
| BASE_FEATURE(kV8SlowHistogramsSparkplug, |
| "V8SlowHistogramsSparkplug", |
| base::FEATURE_DISABLED_BY_DEFAULT); |
| BASE_FEATURE(kV8SlowHistogramsSparkplugAndroid, |
| "V8SlowHistogramsSparkplugAndroid", |
| base::FEATURE_DISABLED_BY_DEFAULT); |
| BASE_FEATURE(kV8SlowHistogramsNoTurbofan, |
| "V8SlowHistogramsNoTurbofan", |
| base::FEATURE_DISABLED_BY_DEFAULT); |
| |
| BASE_FEATURE(kV8DelayMemoryReducer, |
| "V8DelayMemoryReducer", |
| base::FEATURE_ENABLED_BY_DEFAULT); |
| const base::FeatureParam<base::TimeDelta> kV8MemoryReducerStartDelay{ |
| &kV8DelayMemoryReducer, "delay", base::Seconds(30)}; |
| |
| BASE_FEATURE(kV8ConcurrentMarkingHighPriorityThreads, |
| "V8ConcurrentMarkingHighPriorityThreads", |
| base::FEATURE_DISABLED_BY_DEFAULT); |
| |
| BASE_FEATURE(kV8UseLibmTrigFunctions, |
| "V8UseLibmTrigFunctions", |
| base::FEATURE_ENABLED_BY_DEFAULT); |
| |
| // Elide redundant TDZ hole checks in bytecode. This only sets the V8 flag when |
| // manually overridden. |
| BASE_FEATURE(kV8IgnitionElideRedundantTdzChecks, |
| "V8IgnitionElideRedundantTdzChecks", |
| base::FEATURE_ENABLED_BY_DEFAULT); |
| |
| // The currently enabled fallback to the mid-tier register allocator for huge |
| // Wasm functions. We want to remove this fallback in the future. |
| BASE_FEATURE(kV8MidtierRegallocFallback, |
| "V8MidtierRegallocFallback", |
| base::FEATURE_DISABLED_BY_DEFAULT); |
| |
| // JavaScript language features. |
| |
| // Enables the Symbols-as-WeakMap-keys proposal. |
| BASE_FEATURE(kJavaScriptSymbolAsWeakMapKey, |
| "JavaScriptSymbolAsWeakMapKey", |
| base::FEATURE_ENABLED_BY_DEFAULT); |
| |
| // Enables the change-Array-by-copy proposal. |
| BASE_FEATURE(kJavaScriptChangeArrayByCopy, |
| "JavaScriptChangeArrayByCopy", |
| base::FEATURE_ENABLED_BY_DEFAULT); |
| |
| // Enables the Resizable ArrayBuffer proposal. |
| BASE_FEATURE(kJavaScriptRabGsab, |
| "JavaScriptRabGsab", |
| base::FEATURE_ENABLED_BY_DEFAULT); |
| |
| // Enables the JavaScript RegExp Unicode set notation proposal. |
| BASE_FEATURE(kJavaScriptRegExpUnicodeSets, |
| "JavaScriptRegExpUnicodeSets", |
| base::FEATURE_ENABLED_BY_DEFAULT); |
| |
| // Enables the JSON.parse with source proposal. |
| BASE_FEATURE(kJavaScriptJsonParseWithSource, |
| "JavaScriptJsonParseWithSource", |
| base::FEATURE_ENABLED_BY_DEFAULT); |
| |
| // Enables the ArrayBuffer transfer proposal. |
| BASE_FEATURE(kJavaScriptArrayBufferTransfer, |
| "JavaScriptArrayBufferTransfer", |
| base::FEATURE_ENABLED_BY_DEFAULT); |
| |
| // Enables the experiment with compile hints as magic comments. |
| BASE_FEATURE(kJavaScriptCompileHintsMagic, |
| "JavaScriptCompileHintsMagic", |
| base::FEATURE_DISABLED_BY_DEFAULT); |
| |
| // Enables the iterator helpers proposal. |
| BASE_FEATURE(kJavaScriptIteratorHelpers, |
| "kJavaScriptIteratorHelpers", |
| base::FEATURE_ENABLED_BY_DEFAULT); |
| |
| // Enables the Promise.withResolvers proposal. |
| BASE_FEATURE(kJavaScriptPromiseWithResolvers, |
| "JavaScriptPromiseWithResolvers", |
| base::FEATURE_ENABLED_BY_DEFAULT); |
| |
| // WebAssembly features. |
| |
| // Enable support for the WebAssembly tail-call proposal: |
| // https://github.com/WebAssembly/tail-call. |
| BASE_FEATURE(kWebAssemblyTailCall, |
| "WebAssemblyTailCall", |
| base::FEATURE_ENABLED_BY_DEFAULT); |
| |
| // Enable WebAssembly inlining (not user visible). |
| BASE_FEATURE(kWebAssemblyInlining, |
| "WebAssemblyInlining", |
| base::FEATURE_DISABLED_BY_DEFAULT); |
| |
| // Enable the generic wasm-to-js wrapper. |
| BASE_FEATURE(kWebAssemblyGenericWrapper, |
| "WebAssemblyGenericWrapper", |
| base::FEATURE_DISABLED_BY_DEFAULT); |
| |
| // 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(kWebAssemblyMultipleMemories, |
| "WebAssemblyMultipleMemories", |
| base::FEATURE_ENABLED_BY_DEFAULT); |
| |
| BASE_FEATURE(kWebAssemblyTurboshaft, |
| "WebAssemblyTurboshaft", |
| base::FEATURE_DISABLED_BY_DEFAULT); |
| |
| } // namespace features |