1 files changed, 184 insertions, 0 deletions
diff --git a/js/src/jit/JitOptions.h b/js/src/jit/JitOptions.h
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+++ b/js/src/jit/JitOptions.h
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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 http://mozilla.org/MPL/2.0/. */
+
+#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 {
+  RegisterAllocator_Backtracking,
+  RegisterAllocator_Testbed,
+};
+
+// Which register to use as base register to access stack slots: frame pointer,
+// stack pointer, or whichever is the default for this platform. See comment
+// for baseRegForLocals in JitOptions.cpp for more information.
+enum class BaseRegForAddress { Default, FP, SP };
+
+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;
+#ifdef CHECK_OSIPOINT_REGISTERS
+  bool checkOsiPointRegisters;
+#endif
+  bool checkRangeAnalysis;
+  bool runExtraChecks;
+  bool disableJitBackend;
+  bool disableJitHints;
+  bool disableAma;
+  bool disableEaa;
+  bool disableEdgeCaseAnalysis;
+  bool disableGvn;
+  bool disableInlining;
+  bool disableLicm;
+  bool disablePruning;
+  bool disableInstructionReordering;
+  bool disableIteratorIndices;
+  bool disableRangeAnalysis;
+  bool disableRecoverIns;
+  bool disableScalarReplacement;
+  bool disableCacheIR;
+  bool disableSink;
+  bool disableRedundantShapeGuards;
+  bool disableRedundantGCBarriers;
+  bool disableBailoutLoopCheck;
+  bool baselineInterpreter;
+  bool baselineJit;
+  bool ion;
+  bool jitForTrustedPrincipals;
+  bool nativeRegExp;
+  bool forceInlineCaches;
+  bool forceMegamorphicICs;
+  bool fullDebugChecks;
+  bool limitScriptSize;
+  bool osr;
+  bool wasmFoldOffsets;
+  bool wasmDelayTier2;
+  bool lessDebugCode;
+  bool enableWatchtowerMegamorphic;
+  bool onlyInlineSelfHosted;
+  bool enableICFramePointers;
+  bool enableWasmJitExit;
+  bool enableWasmJitEntry;
+  bool enableWasmIonFastCalls;
+#ifdef WASM_CODEGEN_DEBUG
+  bool enableWasmImportCallSpew;
+  bool enableWasmFuncCallSpew;
+#endif
+  bool emitInterpreterEntryTrampoline;
+  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;
+  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 supportsUnalignedAccesses;
+  BaseRegForAddress baseRegForLocals;
+
+  // Irregexp shim flags
+  bool correctness_fuzzer_suppressions;
+  bool enable_regexp_unaligned_accesses;
+  bool regexp_possessive_quantifier;
+  bool regexp_optimization;
+  bool regexp_peephole_optimization;
+  bool regexp_tier_up;
+  bool trace_regexp_assembler;
+  bool trace_regexp_bytecodes;
+  bool trace_regexp_parser;
+  bool trace_regexp_peephole_optimization;
+
+  DefaultJitOptions();
+  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 HasJitBackend() {
+#if defined(JS_CODEGEN_NONE)
+  return false;
+#else
+  return !JitOptions.disableJitBackend;
+#endif
+}
+
+inline bool IsBaselineInterpreterEnabled() {
+  return HasJitBackend() && JitOptions.baselineInterpreter;
+}
+
+inline bool TooManyActualArguments(size_t nargs) {
+  return nargs > JitOptions.maxStackArgs;
+}
+
+}  // namespace jit
+
+extern mozilla::Atomic<bool> fuzzingSafe;
+
+static inline bool IsFuzzing() {
+#ifdef FUZZING
+  return true;
+#else
+  return fuzzingSafe;
+#endif
+}
+
+}  // namespace js
+
+#endif /* jit_JitOptions_h */