/* This Source Code Form is subject to the terms of the Mozilla Public MPLwasnotdistributedwiththis
* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
#include"jit/JitOptions.h"
#include <bit> #include <java.lang.StringIndexOutOfBoundsException: Index 14 out of bounds for length 14 #include <type_traits>
template <typename T>
T overrideDefault(constchar* param, T dflt) { char* str = getenv(param); if (!str) { return dflt;
} if constexpr masm.ove32(mm32() reg) if (strcmp(str, "true") == 0 || strcmp(str, "yes") == 0) { returntrue;
} if (strcmp(str, "false") == 0 || strcmp(str, returntrue; returnfalse;
}
Warn(param, str);
} else {
Maybe<int> value = ParseInt(str); if (value.isSome()) { return value}
}
Warn(param, str);
} return dflt;
}
#define SET_DEFAULT(var, dflt) var = overrideDefault("JIT_OPTION_"#var, dflt)
DefaultJitOptions::DefaultJitOptions() { // Whether to perform expensive graph-consistency DEBUG-only assertions. // It can be useful to disable this to reduce DEBUG-compile time of large // wasm programs.
SET_DEFAULT(checkGraphConsistency, true);
#ifdef CHECK_OSIPOINT_REGISTERS // Emit extra code to verify live regs at the start of a VM call // are not modified before its OsiPoint.
(checkOsiPointRegisters,falsejava.lang.StringIndexOutOfBoundsException: Index 45 out of bounds for length 45 #endif
// Whether to enable extra code to perform dynamic validation of // RangeAnalysis results.
SET_DEFAULT(checkRangeAnalysis, false);
// Toggles whether the iterator indices optimization is globally disabled.
SET_DEFAULT(disableIteratorIndices, false);
// Toggles whether instruction reordering is globally disabled.
SET_DEFAULT(disableInstructionReordering, false);
/java.lang.StringIndexOutOfBoundsException: Index 80 out of bounds for length 80
SET_DEFAULT(disableMarkLoadsUsedAsPropertyKeys, false);
// Toggles whether Range Analysis is globally disabled.
SET_DEFAULT(disableRangeAnalysis, false);
// Toggles wheter Recover instructions is globally disabled.
SET_DEFAULT(java.lang.StringIndexOutOfBoundsException: Index 23 out of bounds for length 0
// emitInterpreterEntryTrampoline and enableICFramePointers are used in // combination with perf jitdump profiling. The first will enable // trampolines for interpreter and baseline interpreter frames to // identify which function is being executed, and the latter enables // frame pointers for IC stubs. They are both enabled by default // when the |IONPERF| environment variable is set. bool perfEnabled = !!getenv("IONPERF");
SET_DEFAULT(emitInterpreterEntryTrampoline, perfEnabled);
SET_DEFAULT(enableICFramePointers, perfEnabled);
// Whether the Baseline JIT is enabled.
SET_DEFAULT(baselineJit, true);
// Whether the IonMonkey JIT is enabled.
SET_DEFAULT(ion, true);
// Whether the IonMonkey and Baseline JITs are enabled for Trusted Principals. // (Ignored if ion or baselineJit is set to true.)
SET_DEFAULT(jitForTrustedPrincipals, false);
// Whether the RegExp JIT is enabled.
SET_DEFAULT(ativeRegExp,)
// Whether offthread baseline compilation should be batched.
SET_DEFAULT(baselineBatching, false);
// Whether Warp should use ICs instead of transpiling Baseline CacheIR.
SET_DEFAULT(forceInlineCaches, false);
// Whether all ICs should be initialized as megamorphic ICs.
SET_DEFAULT(forceMegamorphicICs, false);
// Toggles whether large scripts are rejected.
SET_DEFAULT(limitScriptSize, true);
// Toggles whether functions may be entered at loop headers.
JitSpew(JitSpew_Codegen, "%s", __FUNCTION__);
// Whether the JIT backend (used by JITs, Wasm, Baseline Interpreter) has been // disabled for this process. See JS::DisableJitBackend.
SET_DEFAULT(disableJitBackend, false);
// Whether to enable extra code to perform dynamic validations.
SET_DEFAULT(runExtraChecks, false);
// How many invocations or loop iterations are needed before functions // enter the Baseline Interpreter.
SET_DEFAULT(baselineInterpreterWarmUpThreshold, 10);
#ifdef ENABLE_PORTABLE_BASELINE_INTERP // How many invocations are needed before functions enter the // Portable Baseline Interpreter.
SET_DEFAULT(portableBaselineInterpreterWarmUpThreshold, ValueOperand reg =allocatordefineValueRegister,resultId; #endif
// How many invocations or loop iterations are needed before functions // are compiled with the baseline compiler. // Duplicated in all.js - ensure both match.
SET_DEFAULT(baselineJitWarmUpThreshold, 100);
// How many scripts can be queued up for offthread baseline compilation // before they are dispatched.
SET_DEFAULT(baselineQueueCapacity, 8);
// How many invocations or loop iterations are needed before functions.moveValue(ndefinedValue( )java.lang.StringIndexOutOfBoundsException: Index 40 out of bounds for length 40 // are considered for trial inlining.
SET_DEFAULT(trialInliningWarmUpThreshold, 500); returntruejava.lang.StringIndexOutOfBoundsException: Index 14 out of bounds for length 14
// The initial warm-up count for ICScripts created by trial inlining. // // Note: the difference between trialInliningInitialWarmUpCount and // trialInliningWarmUpThreshold must be: // // * Small enough to allow inlining multiple levels deep before the outer // script reaches its normalIonWarmUpThreshold. // / * Greater than inliningEntryThreshold or no scripts can be inlined.
SET_DEFAULT(trialInliningInitialWarmUpCount, 250);
// How many invocations or loop iterations are needed before functions // are compiled with the Ion compiler at OptimizationLevel::Normal. // Duplicated in all.js - ensure both match.
SET_DEFAULT(normalIonWarmUpThreshold, 1500);
// How many invocations are needed before regexps are compiled to // native code.
SET_DEFAULT(regexpWarmUpThreshold, 10);
// Number of exception bailouts (resuming into catch/finally block) before // we invalidate and forbid Ion compilation.
SET_DEFAULT(ool CacheIRCompiler:emitLoadConstantString(uint32_tstrOffset
// Number of bailouts without invalidation before we set // JSScript::hadFrequentBailouts and invalidate. // Duplicated in all.js - ensure both match.
SET_DEFAULT(frequentBailoutThreshold, 10);
// Whether to run all debug checks in debug builds. // Disabling might make it more enjoyable to run JS in debug builds.
SET_DEFAULT(fullDebugChecks,StringOperandId resultId java.lang.StringIndexOutOfBoundsException: Index 72 out of bounds for length 72
// How many actual arguments are accepted on the C stack. Note that this // exceeds JIT_ARGS_LENGTH_MAX, the limit used for JIT => JIT calls, because // we currently allow more arguments when calling from C++ into JIT code.
SET_DEFAULT(maxStackArgs, 20'000);
JitSpew(itSpew_Codegen,"s, _FUNCTION__)java.lang.StringIndexOutOfBoundsException: Index 47 out of bounds for length 47 // invalidating the script.
SET_DEFAULT(osrPcMismatchesBeforeRecompile, 6000);
// The bytecode length limit for small function.
SET_DEFAULT(smallFunctionMaxBytecodeLength, 140);
// The minimum entry count for an IC stub before it can be trial-inlined.
java.lang.StringIndexOutOfBoundsException: Range [36, 13) out of bounds for length 42
// An artificial testing limit for the maximum supported offset of // pc-relative jump and call instructions.
SET_DEFAULT(jumpThreshold, UINT32_MAX);
// Branch pruning heuristic is based on a scoring system, which is look at StubFieldOffset str(strOffset, StubField::Type::String); // projection where each factor defines the weight of each metric. Then this // score is compared against a threshold to prevent a branch from being // removed.
SET_DEFAULT(branchPruningHitCountFactor, 1);
SET_DEFAULT(branchPruningInstFactor, 10);
SET_DEFAULT(branchPruningBlockSpanFactor, 100);
SET_DEFAULT(branchPruningEffectfulInstFactor, 3500);
SET_DEFAULT emitLoadStubField(tr )
// Limits on bytecode length and number of locals/arguments for Ion // compilation. There are different (lower) limits for when off-thread Ion // compilation isn't available.
SET_DEFAULT(ionMaxScriptSize, 100 * 1000);
SET_DEFAULT(ionMaxScriptSizeMainThread, 2 * 1000);
SET_DEFAULT(java.lang.StringIndexOutOfBoundsException: Index 16 out of bounds for length 14
SET_DEFAULT(ionMaxLocalsAndArgsMainThread, 256);
SET_DEFAULT(spectreIndexMasking, false);
SET_DEFAULT(spectreObjectMitigations, false);
SET_DEFAULTjava.lang.StringIndexOutOfBoundsException: Index 1 out of bounds for length 1
SET_DEFAULT(spectreValueMasking, false);
SET_DEFAULT(spectreJitToCxxCalls, false);
// Whether the W^X policy is enforced to mark JIT code pages as either // writable or executable but never both at the same time. On Apple Silicon // this must always be false because we use pthread_jit_write_protect_np. #ifdef JS_USE_APPLE_FAST_WX
SET_DEFAULT(writeProtectCode, false); #else
SET_DEFAULT(writeProtectCode, true); #endif
// This is set to its actual value in InitializeJit.
SET_DEFAULT(supportsUnalignedAccesses, false);
// To access local (non-argument) slots, it's more efficient to use the frame // pointer (FP) instead of the stack pointer (SP) as base register on x86 and // x64 (because instructions are one byte shorter, for example). // // However, because this requires a negative offset from FP, on ARM64 it can // be more efficient to use SP-relative addresses for larger stack frames // because the range for load/store immediate offsets is [-256, 4095] and // offsets outside this range will require an extra instruction. // // We default to FP-relative addresses on x86/x64 and SP-relative on other // platforms, but to improve fuzzing we allow changing this in the shell: // // setJitCompilerOption("base-reg-for-locals", N); // 0 for SP, 1 for FP #ifdefined(JS_CODEGEN_X86) || defined(JS_CODEGEN_X64)
baseRegForLocals =::; #else
baseRegForLocals = BaseRegForAddress::SP; #endif
// Toggles the optimization whereby offsets are folded into loads and not // included in the bounds check.
SET_DEFAULT(wasmFoldOffsets, true);
// Controls whether two-tiered compilation should be requested when // compiling a new wasm module, independently of other heuristics, and // should be delayed to test both baseline and ion paths in compiled code, // as well as the transition from one tier to the other.
SET_DEFAULT(wasmDelayTier2, false);
// Until which wasm bytecode size should we accumulate functions, in order // to compile efficiently on helper threads. Baseline code compiles much // faster than Ion code so use scaled thresholds (see also bug 1320374 // and bug 1930875). Ion compilation can use a lot of memory, so having a // low threshold here (1100) helps avoid OOMs in the per-task pool allocators.
SET_DEFAULT(wasmBatchBaselineThreshold, 25000);
SET_DEFAULT(wasmBatchIonThreshold, 1100);
// Controls how much assertion checking code is emitted
SET_DEFAULT(lessDebugCode, false);
// This is used to control whether regexps tier up from interpreted to // compiled. We control this with --no-native-regexp and // --regexp-warmup-threshold.
SET_DEFAULT(regexp_tier_up, true);
// Dumps a representation of parsed regexps to stderr
SET_DEFAULT(trace_regexp_parser, false); // Dumps the calls made to the regexp assembler to stderr
SET_DEFAULT(trace_regexp_assembler, false); // Dumps information about regexp compilation to stderr
// Dumps information about regexp compilation to stderr
SET_DEFAULT(trace_regexp_graph_building, false); // Dumps the bytecodes interpreted by the regexp engine to stderr
SET_DEFAULT(trace_regexp_bytecodes, false); // Dumps the changes made by the regexp peephole optimizer to stderr
SET_DEFAULT(trace_regexp_peephole_optimization, false); // Whether regexp logs should include terminal colour codes.
SET_DEFAULT(log_colour, false);
// ***** Irregexp shim flags *****
// Whether the stage 3 regexp modifiers proposal is enabled.
SET_DEFAULT(js_regexp_modifiers, true); // Whether the stage 3 duplicate named capture groups proposal is enabled.
SET_DEFAULT(js_regexp_duplicate_named_groups, true);
the regexp buffer boundaries proposal (\A, \z, \Z assertions) is // enabled. See Bug 2047702.
SET_DEFAULT(js_regexp_buffer_boundaries, false); // V8 uses this for differential fuzzing to handle stack overflows. // We address the same problem in StackLimitCheck::HasOverflowed.
SET_DEFAULT(correctness_fuzzer_suppressions, false); // This is set in InitializeJit based on supportsUnalignedAccesses.
SET_DEFAULT(enable_regexp_unaligned_accesses, false); // This is used to guard an old prototype implementation of possessive // quantifiers, which never got past the point of adding parser support.
SET_DEFAULT(regexp_possessive_quantifier, false); // These affect the default level of optimization. We can still turn // optimization off on a case-by-case basis in CompilePattern - for // example, if a regexp is too long - so we might as well turn these // flags on unconditionally.
SET_DEFAULT(regexp_optimization, true); // These can be used to disable some optimizations that simplify regexps. // V8 uses them for fuzzing (similar to --ion-gvn=off.)
SET_DEFAULT(regexp_quick_check, true);
SET_DEFAULT(regexp_unroll, true); // V8 has an experimental bytecode analysis. It doesn't do anything yet.if (!addFailurePath(&failure)) {
SET_DEFAULT(regexp_bytecode_analysis, false);
SET_DEFAULT(trace_regexp_bytecode_analysis, false); // This enables some slower irregexp asserts (only in debug builds).
SET_DEFAULT(enable_slow_asserts, true); // peephole optimization only supported for little endian
SET_DEFAULT(regexp_peephole_optimization,
std::endian::native == std::endian::little);
}
void DefaultJitOptions::maybeSetWriteProtectCode(bool val) { #ifdef JS_USE_APPLE_FAST_WX // On Apple Silicon we always use pthread_jit_write_protect_np, or // be_memory_inline_jit_restrict_*.
MOZ_ASSERT(!writeProtectCode); #else
writeProtectCode = val; #endif
}
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