The Tor Browser: js/src/jit/JitOptions.cpp@129ffea94266 (annotated)

js/src/jit/JitOptions.cpp@129ffea94266 (annotated)

js/src/jit/JitOptions.cpp

Sat, 03 Jan 2015 20:18:00 +0100

author: Michael Schloh von Bennewitz <michael@schloh.com>
date: Sat, 03 Jan 2015 20:18:00 +0100
branch: TOR_BUG_3246
changeset 7: 129ffea94266
permissions: -rw-r--r--

Conditionally enable double key logic according to:
private browsing mode or privacy.thirdparty.isolate preference and
implement in GetCookieStringCommon and FindCookie where it counts...
With some reservations of how to convince FindCookie users to test
condition and pass a nullptr when disabling double key logic.

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

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js/src/jit/JitOptions.cpp@129ffea94266 (annotated)

js/src/jit/JitOptions.cpp