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/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*-
* vim: set ts=8 sts=2 et sw=2 tw=80:
* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at */
#ifndef jit_JitOptions_h
#define jit_JitOptions_h
#include "mozilla/Maybe.h"
#include "jit/IonTypes.h"
#include "js/TypeDecls.h"
namespace js {
namespace jit {
// Possible register allocators which may be used.
enum IonRegisterAllocator {
static inline mozilla::Maybe<IonRegisterAllocator> LookupRegisterAllocator(
const char* name) {
if (!strcmp(name, "backtracking")) {
return mozilla::Some(RegisterAllocator_Backtracking);
if (!strcmp(name, "testbed")) {
return mozilla::Some(RegisterAllocator_Testbed);
return mozilla::Nothing();
struct DefaultJitOptions {
bool checkGraphConsistency;
bool checkOsiPointRegisters;
bool checkRangeAnalysis;
bool runExtraChecks;
bool disableAma;
bool disableEaa;
bool disableEdgeCaseAnalysis;
bool disableGvn;
bool disableInlining;
bool disableLicm;
bool disablePruning;
bool disableInstructionReordering;
bool disableRangeAnalysis;
bool disableRecoverIns;
bool disableScalarReplacement;
bool disableCacheIR;
bool disableSink;
bool disableBailoutLoopCheck;
bool baselineInterpreter;
bool baselineJit;
bool ion;
bool warpAsync;
bool warpGenerator;
bool jitForTrustedPrincipals;
bool nativeRegExp;
bool forceInlineCaches;
bool forceMegamorphicICs;
bool fullDebugChecks;
bool limitScriptSize;
bool osr;
bool wasmFoldOffsets;
bool wasmDelayTier2;
bool enableTraceLogger;
bool traceRegExpParser;
bool traceRegExpAssembler;
bool traceRegExpInterpreter;
bool traceRegExpPeephole;
bool lessDebugCode;
bool enableWasmJitExit;
bool enableWasmJitEntry;
bool enableWasmIonFastCalls;
bool enableWasmImportCallSpew;
bool enableWasmFuncCallSpew;
uint32_t baselineInterpreterWarmUpThreshold;
uint32_t baselineJitWarmUpThreshold;
uint32_t trialInliningWarmUpThreshold;
uint32_t trialInliningInitialWarmUpCount;
uint32_t normalIonWarmUpThreshold;
uint32_t regexpWarmUpThreshold;
uint32_t exceptionBailoutThreshold;
uint32_t frequentBailoutThreshold;
uint32_t maxStackArgs;
uint32_t osrPcMismatchesBeforeRecompile;
uint32_t smallFunctionMaxBytecodeLength;
uint32_t inliningEntryThreshold;
uint32_t jumpThreshold;
uint32_t branchPruningHitCountFactor;
uint32_t branchPruningInstFactor;
uint32_t branchPruningBlockSpanFactor;
uint32_t branchPruningEffectfulInstFactor;
uint32_t branchPruningThreshold;
uint32_t ionMaxScriptSize;
uint32_t ionMaxScriptSizeMainThread;
uint32_t ionMaxLocalsAndArgs;
uint32_t ionMaxLocalsAndArgsMainThread;
uint32_t wasmBatchBaselineThreshold;
uint32_t wasmBatchIonThreshold;
uint32_t wasmBatchCraneliftThreshold;
mozilla::Maybe<IonRegisterAllocator> forcedRegisterAllocator;
// Spectre mitigation flags. Each mitigation has its own flag in order to
// measure the effectiveness of each mitigation with various proof of
// concept.
bool spectreIndexMasking;
bool spectreObjectMitigations;
bool spectreStringMitigations;
bool spectreValueMasking;
bool spectreJitToCxxCalls;
bool supportsFloatingPoint;
bool supportsUnalignedAccesses;
bool isSmallFunction(JSScript* script) const;
void setEagerBaselineCompilation();
void setEagerIonCompilation();
void setNormalIonWarmUpThreshold(uint32_t warmUpThreshold);
void resetNormalIonWarmUpThreshold();
void enableGvn(bool val);
void setFastWarmUp();
bool eagerIonCompilation() const { return normalIonWarmUpThreshold == 0; }
extern DefaultJitOptions JitOptions;
inline bool IsBaselineInterpreterEnabled() {
return false;
return JitOptions.baselineInterpreter && JitOptions.supportsFloatingPoint;
} // namespace jit
extern mozilla::Atomic<bool> fuzzingSafe;
static inline bool IsFuzzing() {
#ifdef FUZZING
return true;
return fuzzingSafe;
} // namespace js
#endif /* jit_JitOptions_h */