1.1 --- /dev/null Thu Jan 01 00:00:00 1970 +0000
1.2 +++ b/js/src/jit/JitOptions.cpp Wed Dec 31 06:09:35 2014 +0100
1.3 @@ -0,0 +1,161 @@
1.4 +/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 4 -*-
1.5 + * vim: set ts=8 sts=4 et sw=4 tw=99:
1.6 + * This Source Code Form is subject to the terms of the Mozilla Public
1.7 + * License, v. 2.0. If a copy of the MPL was not distributed with this
1.8 + * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
1.9 +
1.10 +#include "jit/JitOptions.h"
1.11 +
1.12 +#include "jsscript.h"
1.13 +
1.14 +using namespace js;
1.15 +using namespace js::jit;
1.16 +
1.17 +namespace js {
1.18 +namespace jit {
1.19 +
1.20 +JitOptions js_JitOptions;
1.21 +
1.22 +JitOptions::JitOptions()
1.23 +{
1.24 + // Whether to perform expensive graph-consistency DEBUG-only assertions.
1.25 + // It can be useful to disable this to reduce DEBUG-compile time of large
1.26 + // asm.js programs.
1.27 + checkGraphConsistency = true;
1.28 +
1.29 +#ifdef CHECK_OSIPOINT_REGISTERS
1.30 + // Emit extra code to verify live regs at the start of a VM call
1.31 + // are not modified before its OsiPoint.
1.32 + checkOsiPointRegisters = false;
1.33 +#endif
1.34 +
1.35 + // Whether to enable extra code to perform dynamic validation of
1.36 + // RangeAnalysis results.
1.37 + checkRangeAnalysis = false;
1.38 +
1.39 + // Whether Ion should compile try-catch statements.
1.40 + compileTryCatch = true;
1.41 +
1.42 + // Toggle whether global value numbering is globally disabled.
1.43 + disableGvn = false;
1.44 +
1.45 + // Toggles whether loop invariant code motion is globally disabled.
1.46 + disableLicm = false;
1.47 +
1.48 + // Toggles whether inlining is globally disabled.
1.49 + disableInlining = false;
1.50 +
1.51 + // Toggles whether Edge Case Analysis is gobally disabled.
1.52 + disableEdgeCaseAnalysis = false;
1.53 +
1.54 + // Toggles whether Range Analysis is globally disabled.
1.55 + disableRangeAnalysis = false;
1.56 +
1.57 + // Toggles whether Unreachable Code Elimination is globally disabled.
1.58 + disableUce = false;
1.59 +
1.60 + // Toggles whether Effective Address Analysis is globally disabled.
1.61 + disableEaa = false;
1.62 +
1.63 + // Whether functions are compiled immediately.
1.64 + eagerCompilation = false;
1.65 +
1.66 + // Force how many invocation or loop iterations are needed before compiling
1.67 + // a function with the highest ionmonkey optimization level.
1.68 + // (i.e. OptimizationLevel_Normal)
1.69 + forceDefaultIonUsesBeforeCompile = false;
1.70 + forcedDefaultIonUsesBeforeCompile = 1000;
1.71 +
1.72 + // Force the GVN kind to be optimistic or pessimistic instead of letting
1.73 + // the optimization pass decide.
1.74 + forceGvnKind = false;
1.75 + forcedGvnKind = GVN_Optimistic;
1.76 +
1.77 + // Force the used register allocator instead of letting the
1.78 + // optimization pass decide.
1.79 + forceRegisterAllocator = false;
1.80 + forcedRegisterAllocator = RegisterAllocator_LSRA;
1.81 +
1.82 + // Toggles whether large scripts are rejected.
1.83 + limitScriptSize = true;
1.84 +
1.85 + // Toggles whether functions may be entered at loop headers.
1.86 + osr = true;
1.87 +
1.88 + // How many invocations or loop iterations are needed before functions
1.89 + // are compiled with the baseline compiler.
1.90 + baselineUsesBeforeCompile = 10;
1.91 +
1.92 + // Number of exception bailouts (resuming into catch/finally block) before
1.93 + // we invalidate and forbid Ion compilation.
1.94 + exceptionBailoutThreshold = 10;
1.95 +
1.96 + // Number of bailouts without invalidation before we set
1.97 + // JSScript::hadFrequentBailouts and invalidate.
1.98 + frequentBailoutThreshold = 10;
1.99 +
1.100 + // How many actual arguments are accepted on the C stack.
1.101 + maxStackArgs = 4096;
1.102 +
1.103 + // How many times we will try to enter a script via OSR before
1.104 + // invalidating the script.
1.105 + osrPcMismatchesBeforeRecompile = 6000;
1.106 +
1.107 + // The bytecode length limit for small function.
1.108 + //
1.109 + // The default for this was arrived at empirically via benchmarking.
1.110 + // We may want to tune it further after other optimizations have gone
1.111 + // in.
1.112 + smallFunctionMaxBytecodeLength_ = 100;
1.113 +
1.114 + // How many uses of a parallel kernel before we attempt compilation.
1.115 + usesBeforeCompilePar = 1;
1.116 +
1.117 + // Whether to profile inlined functions in Ion or not.
1.118 + profileInlineFrames = false;
1.119 +}
1.120 +
1.121 +bool
1.122 +JitOptions::isSmallFunction(JSScript *script) const
1.123 +{
1.124 + return script->length() <= smallFunctionMaxBytecodeLength_;
1.125 +}
1.126 +
1.127 +void
1.128 +JitOptions::setEagerCompilation()
1.129 +{
1.130 + eagerCompilation = true;
1.131 + baselineUsesBeforeCompile = 0;
1.132 + forceDefaultIonUsesBeforeCompile = true;
1.133 + forcedDefaultIonUsesBeforeCompile = 0;
1.134 +}
1.135 +
1.136 +void
1.137 +JitOptions::setUsesBeforeCompile(uint32_t useCount)
1.138 +{
1.139 + forceDefaultIonUsesBeforeCompile = true;
1.140 + forcedDefaultIonUsesBeforeCompile = useCount;
1.141 +
1.142 + // Undo eager compilation
1.143 + if (eagerCompilation && useCount != 0) {
1.144 + jit::JitOptions defaultValues;
1.145 + eagerCompilation = false;
1.146 + baselineUsesBeforeCompile = defaultValues.baselineUsesBeforeCompile;
1.147 + }
1.148 +}
1.149 +
1.150 +void
1.151 +JitOptions::resetUsesBeforeCompile()
1.152 +{
1.153 + forceDefaultIonUsesBeforeCompile = false;
1.154 +
1.155 + // Undo eager compilation
1.156 + if (eagerCompilation) {
1.157 + jit::JitOptions defaultValues;
1.158 + eagerCompilation = false;
1.159 + baselineUsesBeforeCompile = defaultValues.baselineUsesBeforeCompile;
1.160 + }
1.161 +}
1.162 +
1.163 +} // namespace jit
1.164 +} // namespace js
