michael@0: /* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 4 -*-
michael@0:  * vim: set ts=8 sts=4 et sw=4 tw=99:
michael@0:  * This Source Code Form is subject to the terms of the Mozilla Public
michael@0:  * License, v. 2.0. If a copy of the MPL was not distributed with this
michael@0:  * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
michael@0: 
michael@0: #include "jit/JitOptions.h"
michael@0: 
michael@0: #include "jsscript.h"
michael@0: 
michael@0: using namespace js;
michael@0: using namespace js::jit;
michael@0: 
michael@0: namespace js {
michael@0: namespace jit {
michael@0: 
michael@0: JitOptions js_JitOptions;
michael@0: 
michael@0: JitOptions::JitOptions()
michael@0: {
michael@0:     // Whether to perform expensive graph-consistency DEBUG-only assertions.
michael@0:     // It can be useful to disable this to reduce DEBUG-compile time of large
michael@0:     // asm.js programs.
michael@0:     checkGraphConsistency = true;
michael@0: 
michael@0: #ifdef CHECK_OSIPOINT_REGISTERS
michael@0:     // Emit extra code to verify live regs at the start of a VM call
michael@0:     // are not modified before its OsiPoint.
michael@0:     checkOsiPointRegisters = false;
michael@0: #endif
michael@0: 
michael@0:     // Whether to enable extra code to perform dynamic validation of
michael@0:     // RangeAnalysis results.
michael@0:     checkRangeAnalysis = false;
michael@0: 
michael@0:     // Whether Ion should compile try-catch statements.
michael@0:     compileTryCatch = true;
michael@0: 
michael@0:     // Toggle whether global value numbering is globally disabled.
michael@0:     disableGvn = false;
michael@0: 
michael@0:     // Toggles whether loop invariant code motion is globally disabled.
michael@0:     disableLicm = false;
michael@0: 
michael@0:     // Toggles whether inlining is globally disabled.
michael@0:     disableInlining = false;
michael@0: 
michael@0:     // Toggles whether Edge Case Analysis is gobally disabled.
michael@0:     disableEdgeCaseAnalysis = false;
michael@0: 
michael@0:     // Toggles whether Range Analysis is globally disabled.
michael@0:     disableRangeAnalysis = false;
michael@0: 
michael@0:     // Toggles whether Unreachable Code Elimination is globally disabled.
michael@0:     disableUce = false;
michael@0: 
michael@0:     // Toggles whether Effective Address Analysis is globally disabled.
michael@0:     disableEaa = false;
michael@0: 
michael@0:     // Whether functions are compiled immediately.
michael@0:     eagerCompilation = false;
michael@0: 
michael@0:     // Force how many invocation or loop iterations are needed before compiling
michael@0:     // a function with the highest ionmonkey optimization level.
michael@0:     // (i.e. OptimizationLevel_Normal)
michael@0:     forceDefaultIonUsesBeforeCompile = false;
michael@0:     forcedDefaultIonUsesBeforeCompile = 1000;
michael@0: 
michael@0:     // Force the GVN kind to be optimistic or pessimistic instead of letting
michael@0:     // the optimization pass decide.
michael@0:     forceGvnKind = false;
michael@0:     forcedGvnKind = GVN_Optimistic;
michael@0: 
michael@0:     // Force the used register allocator instead of letting the
michael@0:     // optimization pass decide.
michael@0:     forceRegisterAllocator = false;
michael@0:     forcedRegisterAllocator = RegisterAllocator_LSRA;
michael@0: 
michael@0:     // Toggles whether large scripts are rejected.
michael@0:     limitScriptSize = true;
michael@0: 
michael@0:     // Toggles whether functions may be entered at loop headers.
michael@0:     osr = true;
michael@0: 
michael@0:     // How many invocations or loop iterations are needed before functions
michael@0:     // are compiled with the baseline compiler.
michael@0:     baselineUsesBeforeCompile = 10;
michael@0: 
michael@0:     // Number of exception bailouts (resuming into catch/finally block) before
michael@0:     // we invalidate and forbid Ion compilation.
michael@0:     exceptionBailoutThreshold = 10;
michael@0: 
michael@0:     // Number of bailouts without invalidation before we set
michael@0:     // JSScript::hadFrequentBailouts and invalidate.
michael@0:     frequentBailoutThreshold = 10;
michael@0: 
michael@0:     // How many actual arguments are accepted on the C stack.
michael@0:     maxStackArgs = 4096;
michael@0: 
michael@0:     // How many times we will try to enter a script via OSR before
michael@0:     // invalidating the script.
michael@0:     osrPcMismatchesBeforeRecompile = 6000;
michael@0: 
michael@0:     // The bytecode length limit for small function.
michael@0:     //
michael@0:     // The default for this was arrived at empirically via benchmarking.
michael@0:     // We may want to tune it further after other optimizations have gone
michael@0:     // in.
michael@0:     smallFunctionMaxBytecodeLength_ = 100;
michael@0: 
michael@0:     // How many uses of a parallel kernel before we attempt compilation.
michael@0:     usesBeforeCompilePar = 1;
michael@0: 
michael@0:     // Whether to profile inlined functions in Ion or not.
michael@0:     profileInlineFrames = false;
michael@0: }
michael@0: 
michael@0: bool
michael@0: JitOptions::isSmallFunction(JSScript *script) const
michael@0: {
michael@0:     return script->length() <= smallFunctionMaxBytecodeLength_;
michael@0: }
michael@0: 
michael@0: void
michael@0: JitOptions::setEagerCompilation()
michael@0: {
michael@0:     eagerCompilation = true;
michael@0:     baselineUsesBeforeCompile = 0;
michael@0:     forceDefaultIonUsesBeforeCompile = true;
michael@0:     forcedDefaultIonUsesBeforeCompile = 0;
michael@0: }
michael@0: 
michael@0: void
michael@0: JitOptions::setUsesBeforeCompile(uint32_t useCount)
michael@0: {
michael@0:     forceDefaultIonUsesBeforeCompile = true;
michael@0:     forcedDefaultIonUsesBeforeCompile = useCount;
michael@0: 
michael@0:     // Undo eager compilation
michael@0:     if (eagerCompilation && useCount != 0) {
michael@0:         jit::JitOptions defaultValues;
michael@0:         eagerCompilation = false;
michael@0:         baselineUsesBeforeCompile = defaultValues.baselineUsesBeforeCompile;
michael@0:     }
michael@0: }
michael@0: 
michael@0: void
michael@0: JitOptions::resetUsesBeforeCompile()
michael@0: {
michael@0:     forceDefaultIonUsesBeforeCompile = false;
michael@0: 
michael@0:     // Undo eager compilation
michael@0:     if (eagerCompilation) {
michael@0:         jit::JitOptions defaultValues;
michael@0:         eagerCompilation = false;
michael@0:         baselineUsesBeforeCompile = defaultValues.baselineUsesBeforeCompile;
michael@0:     }
michael@0: }
michael@0: 
michael@0: } // namespace jit
michael@0: } // namespace js