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/*
* Copyright (C) 2011, 2012 Apple Inc. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY APPLE INC. ``AS IS'' AND ANY
* EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR
* CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
* EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
* PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
* PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
* OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#ifndef Options_h
#define Options_h
#include "JSExportMacros.h"
#include <stdint.h>
#include <stdio.h>
namespace JSC {
// How do JSC VM options work?
// ===========================
// The JSC_OPTIONS() macro below defines a list of all JSC options in use,
// along with their types and default values. The options values are actually
// realized as an array of Options::Entry elements.
//
// Options::initialize() will initialize the array of options values with
// the defaults specified in JSC_OPTIONS() below. After that, the values can
// be programmatically read and written to using an accessor method with the
// same name as the option. For example, the option "useJIT" can be read and
// set like so:
//
// bool jitIsOn = Options::useJIT(); // Get the option value.
// Options::useJIT() = false; // Sets the option value.
//
// If you want to tweak any of these values programmatically for testing
// purposes, you can do so in Options::initialize() after the default values
// are set.
//
// Alternatively, you can enable RUN_TIME_HEURISTICS which will allow you
// to override the default values by specifying environment variables of the
// form: JSC_<name of JSC option>.
//
// Note: Options::initialize() tries to ensure some sanity on the option values
// which are set by doing some range checks, and value corrections. These
// checks are done after the option values are set. If you alter the option
// values after the sanity checks (for your own testing), then you're liable to
// ensure that the new values set are sane and reasonable for your own run.
#define JSC_OPTIONS(v) \
v(bool, useJIT, true) \
v(bool, useDFGJIT, true) \
\
/* showDisassembly implies showDFGDisassembly. */ \
v(bool, showDisassembly, false) \
v(bool, showDFGDisassembly, false) \
\
v(unsigned, maximumOptimizationCandidateInstructionCount, 10000) \
\
v(unsigned, maximumFunctionForCallInlineCandidateInstructionCount, 180) \
v(unsigned, maximumFunctionForConstructInlineCandidateInstructionCount, 100) \
\
/* Depth of inline stack, so 1 = no inlining, 2 = one level, etc. */ \
v(unsigned, maximumInliningDepth, 5) \
\
v(int32, thresholdForJITAfterWarmUp, 100) \
v(int32, thresholdForJITSoon, 100) \
\
v(int32, thresholdForOptimizeAfterWarmUp, 1000) \
v(int32, thresholdForOptimizeAfterLongWarmUp, 5000) \
v(int32, thresholdForOptimizeSoon, 1000) \
\
v(int32, executionCounterIncrementForLoop, 1) \
v(int32, executionCounterIncrementForReturn, 15) \
\
v(bool, randomizeExecutionCountsBetweenCheckpoints, false) \
v(int32, maximumExecutionCountsBetweenCheckpoints, 1000) \
\
v(double, likelyToTakeSlowCaseThreshold, 0.15) \
v(double, couldTakeSlowCaseThreshold, 0.05) \
v(unsigned, likelyToTakeSlowCaseMinimumCount, 100) \
v(unsigned, couldTakeSlowCaseMinimumCount, 10) \
\
v(double, osrExitProminenceForFrequentExitSite, 0.3) \
v(unsigned, osrExitCountForReoptimization, 100) \
v(unsigned, osrExitCountForReoptimizationFromLoop, 5) \
\
v(unsigned, reoptimizationRetryCounterMax, 0) \
v(unsigned, reoptimizationRetryCounterStep, 1) \
\
v(unsigned, minimumOptimizationDelay, 1) \
v(unsigned, maximumOptimizationDelay, 5) \
v(double, desiredProfileLivenessRate, 0.75) \
v(double, desiredProfileFullnessRate, 0.35) \
\
v(double, doubleVoteRatioForDoubleFormat, 2) \
v(double, structureCheckVoteRatioForHoisting, 1) \
\
v(unsigned, minimumNumberOfScansBetweenRebalance, 100) \
v(unsigned, gcMarkStackSegmentSize, pageSize()) \
v(unsigned, numberOfGCMarkers, computeNumberOfGCMarkers(7)) \
v(unsigned, opaqueRootMergeThreshold, 1000) \
\
v(bool, forceWeakRandomSeed, false) \
v(unsigned, forcedWeakRandomSeed, 0)
class Options {
public:
// This typedef is to allow us to eliminate the '_' in the field name in
// union inside Entry. This is needed to keep the style checker happy.
typedef int32_t int32;
// Declare the option IDs:
enum OptionID {
#define FOR_EACH_OPTION(type_, name_, defaultValue_) \
OPT_##name_,
JSC_OPTIONS(FOR_EACH_OPTION)
#undef FOR_EACH_OPTION
numberOfOptions
};
static void initialize();
// Parses a single command line option in the format "<optionName>=<value>"
// (no spaces allowed) and set the specified option if appropriate.
JS_EXPORT_PRIVATE static bool setOption(const char* arg);
JS_EXPORT_PRIVATE static void dumpAllOptions(FILE* stream = stdout);
static void dumpOption(OptionID id, FILE* stream = stdout, const char* header = "", const char* footer = "");
// Declare accessors for each option:
#define FOR_EACH_OPTION(type_, name_, defaultValue_) \
ALWAYS_INLINE static type_& name_() { return s_options[OPT_##name_].u.type_##Val; }
JSC_OPTIONS(FOR_EACH_OPTION)
#undef FOR_EACH_OPTION
private:
enum EntryType {
boolType,
unsignedType,
doubleType,
int32Type
};
// For storing for an option value:
struct Entry {
union {
bool boolVal;
unsigned unsignedVal;
double doubleVal;
int32 int32Val;
} u;
};
// For storing constant meta data about each option:
struct EntryInfo {
const char* name;
EntryType type;
};
Options();
// Declare the options:
#define FOR_EACH_OPTION(type_, name_, defaultValue_) \
type_ m_##name_;
JSC_OPTIONS(FOR_EACH_OPTION)
#undef FOR_EACH_OPTION
// Declare the singleton instance of the options store:
JS_EXPORTDATA static Entry s_options[numberOfOptions];
static const EntryInfo s_optionsInfo[numberOfOptions];
};
} // namespace JSC
#endif // Options_h
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