gecko-dev/dom/workers/JSSettings.h

133 lines
3.4 KiB
C++

/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* vim: set ts=8 sts=2 et sw=2 tw=80: */
/* 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/. */
#ifndef mozilla_dom_workerinternals_JSSettings_h
#define mozilla_dom_workerinternals_JSSettings_h
#include "jsapi.h"
#include "mozilla/Maybe.h"
#include "nsString.h"
#include "nsTArray.h"
namespace mozilla {
namespace dom {
namespace workerinternals {
// Random unique constant to facilitate JSPrincipal debugging
const uint32_t kJSPrincipalsDebugToken = 0x7e2df9d2;
struct JSSettings
{
enum {
// All the GC parameters that we support.
JSSettings_JSGC_MAX_BYTES = 0,
JSSettings_JSGC_MAX_MALLOC_BYTES,
JSSettings_JSGC_HIGH_FREQUENCY_TIME_LIMIT,
JSSettings_JSGC_LOW_FREQUENCY_HEAP_GROWTH,
JSSettings_JSGC_HIGH_FREQUENCY_HEAP_GROWTH_MIN,
JSSettings_JSGC_HIGH_FREQUENCY_HEAP_GROWTH_MAX,
JSSettings_JSGC_HIGH_FREQUENCY_LOW_LIMIT,
JSSettings_JSGC_HIGH_FREQUENCY_HIGH_LIMIT,
JSSettings_JSGC_ALLOCATION_THRESHOLD,
JSSettings_JSGC_SLICE_TIME_BUDGET,
JSSettings_JSGC_DYNAMIC_HEAP_GROWTH,
JSSettings_JSGC_DYNAMIC_MARK_SLICE,
// JSGC_MODE not supported
// This must be last so that we get an accurate count.
kGCSettingsArraySize
};
struct JSGCSetting
{
mozilla::Maybe<JSGCParamKey> key;
uint32_t value;
JSGCSetting()
: key(), value(0)
{ }
};
// There are several settings that we know we need so it makes sense to
// preallocate here.
typedef JSGCSetting JSGCSettingsArray[kGCSettingsArraySize];
// Settings that change based on chrome/content context.
struct JSContentChromeSettings
{
JS::CompartmentOptions compartmentOptions;
int32_t maxScriptRuntime;
JSContentChromeSettings()
: compartmentOptions(), maxScriptRuntime(0)
{ }
};
JSContentChromeSettings chrome;
JSContentChromeSettings content;
JSGCSettingsArray gcSettings;
JS::ContextOptions contextOptions;
#ifdef JS_GC_ZEAL
uint8_t gcZeal;
uint32_t gcZealFrequency;
#endif
JSSettings()
#ifdef JS_GC_ZEAL
: gcZeal(0), gcZealFrequency(0)
#endif
{
for (uint32_t index = 0; index < ArrayLength(gcSettings); index++) {
new (gcSettings + index) JSGCSetting();
}
}
bool
ApplyGCSetting(JSGCParamKey aKey, uint32_t aValue)
{
JSSettings::JSGCSetting* firstEmptySetting = nullptr;
JSSettings::JSGCSetting* foundSetting = nullptr;
for (uint32_t index = 0; index < ArrayLength(gcSettings); index++) {
JSSettings::JSGCSetting& setting = gcSettings[index];
if (setting.key.isSome() && *setting.key == aKey) {
foundSetting = &setting;
break;
}
if (!firstEmptySetting && setting.key.isNothing()) {
firstEmptySetting = &setting;
}
}
if (aValue) {
if (!foundSetting) {
foundSetting = firstEmptySetting;
if (!foundSetting) {
NS_ERROR("Not enough space for this value!");
return false;
}
}
foundSetting->key = mozilla::Some(aKey);
foundSetting->value = aValue;
return true;
}
if (foundSetting) {
foundSetting->key.reset();
return true;
}
return false;
}
};
} // workerinternals namespace
} // dom namespace
} // mozilla namespace
#endif // mozilla_dom_workerinternals_JSSettings_h