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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.
*/
#include "config.h"
#include "Options.h"
#include <algorithm>
#include <limits>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <wtf/NumberOfCores.h>
#include <wtf/PageBlock.h>
#include <wtf/StdLibExtras.h>
#include <wtf/StringExtras.h>
#if OS(DARWIN) && ENABLE(PARALLEL_GC)
#include <sys/sysctl.h>
#endif
// Set to 1 to control the heuristics using environment variables.
#define ENABLE_RUN_TIME_HEURISTICS 0
namespace JSC {
static bool parse(const char* string, bool& value)
{
if (!strcasecmp(string, "true") || !strcasecmp(string, "yes") || !strcmp(string, "1")) {
value = true;
return true;
}
if (!strcasecmp(string, "false") || !strcasecmp(string, "no") || !strcmp(string, "0")) {
value = false;
return true;
}
return false;
}
static bool parse(const char* string, int32_t& value)
{
return sscanf(string, "%d", &value) == 1;
}
static bool parse(const char* string, unsigned& value)
{
return sscanf(string, "%u", &value) == 1;
}
static bool parse(const char* string, double& value)
{
return sscanf(string, "%lf", &value) == 1;
}
#if ENABLE(RUN_TIME_HEURISTICS)
template<typename T>
void overrideOptionWithHeuristic(T& variable, const char* name)
{
const char* stringValue = getenv(name);
if (!stringValue)
return;
if (parse(stringValue, variable))
return;
fprintf(stderr, "WARNING: failed to parse %s=%s\n", name, stringValue);
}
#endif
static unsigned computeNumberOfGCMarkers(int maxNumberOfGCMarkers)
{
int cpusToUse = 1;
#if ENABLE(PARALLEL_GC)
cpusToUse = std::min(WTF::numberOfProcessorCores(), maxNumberOfGCMarkers);
// Be paranoid, it is the OS we're dealing with, after all.
ASSERT(cpusToUse >= 1);
if (cpusToUse < 1)
cpusToUse = 1;
#endif
return cpusToUse;
}
Options::Entry Options::s_options[Options::numberOfOptions];
// Realize the names for each of the options:
const Options::EntryInfo Options::s_optionsInfo[Options::numberOfOptions] = {
#define FOR_EACH_OPTION(type_, name_, defaultValue_) \
{ #name_, Options::type_##Type },
JSC_OPTIONS(FOR_EACH_OPTION)
#undef FOR_EACH_OPTION
};
void Options::initialize()
{
// Initialize each of the options with their default values:
#define FOR_EACH_OPTION(type_, name_, defaultValue_) \
name_() = defaultValue_;
JSC_OPTIONS(FOR_EACH_OPTION)
#undef FOR_EACH_OPTION
// Allow environment vars to override options if applicable.
// The evn var should be the name of the option prefixed with
// "JSC_".
#if ENABLE(RUN_TIME_HEURISTICS)
#define FOR_EACH_OPTION(type_, name_, defaultValue_) \
overrideOptionWithHeuristic(name_(), "JSC_" #name_);
JSC_OPTIONS(FOR_EACH_OPTION)
#undef FOR_EACH_OPTION
#endif // RUN_TIME_HEURISTICS
#if 0
; // Deconfuse editors that do auto indentation
#endif
// Do range checks where needed and make corrections to the options:
ASSERT(thresholdForOptimizeAfterLongWarmUp() >= thresholdForOptimizeAfterWarmUp());
ASSERT(thresholdForOptimizeAfterWarmUp() >= thresholdForOptimizeSoon());
ASSERT(thresholdForOptimizeAfterWarmUp() >= 0);
// Compute the maximum value of the reoptimization retry counter. This is simply
// the largest value at which we don't overflow the execute counter, when using it
// to left-shift the execution counter by this amount. Currently the value ends
// up being 18, so this loop is not so terrible; it probably takes up ~100 cycles
// total on a 32-bit processor.
reoptimizationRetryCounterMax() = 0;
while ((static_cast<int64_t>(thresholdForOptimizeAfterLongWarmUp()) << (reoptimizationRetryCounterMax() + 1)) <= static_cast<int64_t>(std::numeric_limits<int32>::max()))
reoptimizationRetryCounterMax()++;
ASSERT((static_cast<int64_t>(thresholdForOptimizeAfterLongWarmUp()) << reoptimizationRetryCounterMax()) > 0);
ASSERT((static_cast<int64_t>(thresholdForOptimizeAfterLongWarmUp()) << reoptimizationRetryCounterMax()) <= static_cast<int64_t>(std::numeric_limits<int32>::max()));
}
// Parses a single command line option in the format "<optionName>=<value>"
// (no spaces allowed) and set the specified option if appropriate.
bool Options::setOption(const char* arg)
{
// arg should look like this:
// <jscOptionName>=<appropriate value>
const char* equalStr = strchr(arg, '=');
if (!equalStr)
return false;
const char* valueStr = equalStr + 1;
// For each option, check if the specify arg is a match. If so, set the arg
// if the value makes sense. Otherwise, move on to checking the next option.
#define FOR_EACH_OPTION(type_, name_, defaultValue_) \
if (!strncmp(arg, #name_, equalStr - arg)) { \
type_ value; \
bool success = parse(valueStr, value); \
if (success) { \
name_() = value; \
return true; \
} \
return false; \
}
JSC_OPTIONS(FOR_EACH_OPTION)
#undef FOR_EACH_OPTION
return false; // No option matched.
}
void Options::dumpAllOptions(FILE* stream)
{
fprintf(stream, "JSC runtime options:\n");
for (int id = 0; id < numberOfOptions; id++)
dumpOption(static_cast<OptionID>(id), stream, " ", "\n");
}
void Options::dumpOption(OptionID id, FILE* stream, const char* header, const char* footer)
{
if (id >= numberOfOptions)
return; // Illegal option.
fprintf(stream, "%s%s: ", header, s_optionsInfo[id].name);
switch (s_optionsInfo[id].type) {
case boolType:
fprintf(stream, "%s", s_options[id].u.boolVal?"true":"false");
break;
case unsignedType:
fprintf(stream, "%u", s_options[id].u.unsignedVal);
break;
case doubleType:
fprintf(stream, "%lf", s_options[id].u.doubleVal);
break;
case int32Type:
fprintf(stream, "%d", s_options[id].u.int32Val);
break;
}
fprintf(stream, "%s", footer);
}
} // namespace JSC
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