mirror of
https://github.com/darlinghq/darling-JavaScriptCore.git
synced 2024-11-23 04:09:40 +00:00
296 lines
9.1 KiB
C++
296 lines
9.1 KiB
C++
/*
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* Copyright (C) 2013-2019 Apple Inc. All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY APPLE INC. ``AS IS'' AND ANY
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* EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR
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* CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
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* EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
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* PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
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* PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
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* OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#include "config.h"
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#include "DFGLazyJSValue.h"
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#if ENABLE(DFG_JIT)
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#include "CCallHelpers.h"
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#include "DFGGraph.h"
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#include "JSCJSValueInlines.h"
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#include "LinkBuffer.h"
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namespace JSC { namespace DFG {
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LazyJSValue LazyJSValue::newString(Graph& graph, const String& string)
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{
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LazyJSValue result;
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result.m_kind = NewStringImpl;
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result.u.stringImpl = graph.m_localStrings.add(string).iterator->impl();
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return result;
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}
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JSValue LazyJSValue::getValue(VM& vm) const
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{
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switch (m_kind) {
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case KnownValue:
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return value()->value();
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case SingleCharacterString:
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return jsSingleCharacterString(vm, u.character);
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case KnownStringImpl:
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return jsString(vm, u.stringImpl);
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case NewStringImpl:
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return jsString(vm, AtomStringImpl::add(u.stringImpl));
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}
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RELEASE_ASSERT_NOT_REACHED();
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return JSValue();
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}
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static TriState equalToSingleCharacter(JSValue value, UChar character)
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{
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if (!value.isString())
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return TriState::False;
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JSString* jsString = asString(value);
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if (jsString->length() != 1)
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return TriState::False;
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const StringImpl* string = jsString->tryGetValueImpl();
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if (!string)
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return TriState::Indeterminate;
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return triState(string->at(0) == character);
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}
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static TriState equalToStringImpl(JSValue value, StringImpl* stringImpl)
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{
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if (!value.isString())
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return TriState::False;
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JSString* jsString = asString(value);
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const StringImpl* string = jsString->tryGetValueImpl();
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if (!string)
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return TriState::Indeterminate;
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return triState(WTF::equal(stringImpl, string));
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}
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const StringImpl* LazyJSValue::tryGetStringImpl(VM& vm) const
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{
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switch (m_kind) {
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case KnownStringImpl:
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case NewStringImpl:
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return u.stringImpl;
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case KnownValue:
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if (JSString* string = value()->dynamicCast<JSString*>(vm))
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return string->tryGetValueImpl();
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return nullptr;
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case SingleCharacterString:
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return nullptr;
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}
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RELEASE_ASSERT_NOT_REACHED();
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return nullptr;
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}
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String LazyJSValue::tryGetString(Graph& graph) const
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{
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switch (m_kind) {
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case NewStringImpl:
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return u.stringImpl;
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case SingleCharacterString:
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return String(&u.character, 1);
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case KnownValue:
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case KnownStringImpl:
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if (const StringImpl* string = tryGetStringImpl(graph.m_vm)) {
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unsigned ginormousStringLength = 10000;
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if (string->length() > ginormousStringLength)
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return String();
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auto result = graph.m_copiedStrings.add(string, String());
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if (result.isNewEntry)
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result.iterator->value = string->isolatedCopy();
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return result.iterator->value;
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}
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return String();
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}
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RELEASE_ASSERT_NOT_REACHED();
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return String();
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}
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TriState LazyJSValue::strictEqual(const LazyJSValue& other) const
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{
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switch (m_kind) {
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case KnownValue:
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switch (other.m_kind) {
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case KnownValue: {
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if (!value()->value() || !other.value()->value())
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return value()->value() == other.value()->value() ? TriState::True : TriState::False;
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return JSValue::pureStrictEqual(value()->value(), other.value()->value());
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}
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case SingleCharacterString: {
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if (!value()->value())
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return TriState::False;
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return equalToSingleCharacter(value()->value(), other.character());
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}
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case KnownStringImpl:
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case NewStringImpl: {
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if (!value()->value())
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return TriState::False;
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return equalToStringImpl(value()->value(), other.stringImpl());
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}
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}
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break;
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case SingleCharacterString:
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switch (other.m_kind) {
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case SingleCharacterString:
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return triState(character() == other.character());
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case KnownStringImpl:
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case NewStringImpl:
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if (other.stringImpl()->length() != 1)
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return TriState::False;
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return triState(other.stringImpl()->at(0) == character());
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case KnownValue:
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return other.strictEqual(*this);
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}
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break;
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case KnownStringImpl:
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case NewStringImpl:
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switch (other.m_kind) {
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case KnownStringImpl:
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case NewStringImpl:
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return triState(WTF::equal(stringImpl(), other.stringImpl()));
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case SingleCharacterString:
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case KnownValue:
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return other.strictEqual(*this);
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}
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break;
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}
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RELEASE_ASSERT_NOT_REACHED();
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return TriState::False;
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}
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uintptr_t LazyJSValue::switchLookupValue(SwitchKind kind) const
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{
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// NB. Not every kind of JSValue will be able to give you a switch lookup
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// value, and this method will assert, or do bad things, if you use it
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// for a kind of value that can't.
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switch (m_kind) {
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case KnownValue:
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switch (kind) {
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case SwitchImm:
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if (value()->value())
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return value()->value().asInt32();
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return 0;
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case SwitchCell:
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if (value()->value())
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return bitwise_cast<uintptr_t>(value()->value().asCell());
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return 0;
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default:
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RELEASE_ASSERT_NOT_REACHED();
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return 0;
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}
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case SingleCharacterString:
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switch (kind) {
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case SwitchChar:
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return character();
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default:
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RELEASE_ASSERT_NOT_REACHED();
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return 0;
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}
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case KnownStringImpl:
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case NewStringImpl:
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RELEASE_ASSERT_NOT_REACHED();
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return 0;
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}
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RELEASE_ASSERT_NOT_REACHED();
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return 0;
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}
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void LazyJSValue::emit(CCallHelpers& jit, JSValueRegs result) const
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{
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if (m_kind == KnownValue) {
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jit.moveValue(value()->value(), result);
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return;
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}
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// It must be some kind of cell.
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#if USE(JSVALUE32_64)
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jit.move(CCallHelpers::TrustedImm32(JSValue::CellTag), result.tagGPR());
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#endif
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CCallHelpers::DataLabelPtr label = jit.moveWithPatch(
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CCallHelpers::TrustedImmPtr(static_cast<size_t>(0xd1e7beeflu)),
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result.payloadGPR());
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LazyJSValue thisValue = *this;
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// Once we do this, we're committed. Otherwise we leak memory. Note that we call ref/deref
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// manually to ensure that there is no concurrency shadiness. We are doing something here
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// that might be rather brutal: transfering ownership of this string.
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if (m_kind == NewStringImpl)
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thisValue.u.stringImpl->ref();
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CodeBlock* codeBlock = jit.codeBlock();
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jit.addLinkTask(
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[codeBlock, label, thisValue] (LinkBuffer& linkBuffer) {
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JSValue realValue = thisValue.getValue(codeBlock->vm());
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RELEASE_ASSERT(realValue.isCell());
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codeBlock->addConstant(ConcurrentJSLocker(codeBlock->m_lock), realValue);
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if (thisValue.m_kind == NewStringImpl)
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thisValue.u.stringImpl->deref();
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linkBuffer.patch(label, realValue.asCell());
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});
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}
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void LazyJSValue::dumpInContext(PrintStream& out, DumpContext* context) const
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{
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switch (m_kind) {
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case KnownValue:
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value()->dumpInContext(out, context);
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return;
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case SingleCharacterString:
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out.print("Lazy:SingleCharacterString(");
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out.printf("%04X", static_cast<unsigned>(character()));
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out.print(" / ", StringImpl::utf8ForCharacters(&u.character, 1).value(), ")");
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return;
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case KnownStringImpl:
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out.print("Lazy:KnownString(", stringImpl(), ")");
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return;
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case NewStringImpl:
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out.print("Lazy:NewString(", stringImpl(), ")");
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return;
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}
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RELEASE_ASSERT_NOT_REACHED();
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}
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void LazyJSValue::dump(PrintStream& out) const
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{
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dumpInContext(out, nullptr);
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}
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} } // namespace JSC::DFG
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#endif // ENABLE(DFG_JIT)
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