diff -r 000000000000 -r 4f2f89ce4247 JavaScriptCore/runtime/Identifier.cpp --- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/JavaScriptCore/runtime/Identifier.cpp Fri Sep 17 09:02:29 2010 +0300 @@ -0,0 +1,269 @@ +/* + * Copyright (C) 2003, 2004, 2005, 2006, 2007, 2008 Apple Inc. All rights reserved. + * + * This library is free software; you can redistribute it and/or + * modify it under the terms of the GNU Library General Public + * License as published by the Free Software Foundation; either + * version 2 of the License, or (at your option) any later version. + * + * This library is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU + * Library General Public License for more details. + * + * You should have received a copy of the GNU Library General Public License + * along with this library; see the file COPYING.LIB. If not, write to + * the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, + * Boston, MA 02110-1301, USA. + * + */ + +#include "config.h" +#include "Identifier.h" + +#include "CallFrame.h" +#include "NumericStrings.h" +#include // for placement new +#include // for strlen +#include +#include +#include +#include +#include + +using WTF::ThreadSpecific; + +namespace JSC { + +IdentifierTable::~IdentifierTable() +{ + HashSet::iterator end = m_table.end(); + for (HashSet::iterator iter = m_table.begin(); iter != end; ++iter) + (*iter)->setIsIdentifier(false); +} +std::pair::iterator, bool> IdentifierTable::add(StringImpl* value) +{ + std::pair::iterator, bool> result = m_table.add(value); + (*result.first)->setIsIdentifier(true); + return result; +} +template +std::pair::iterator, bool> IdentifierTable::add(U value) +{ + std::pair::iterator, bool> result = m_table.add(value); + (*result.first)->setIsIdentifier(true); + return result; +} + +IdentifierTable* createIdentifierTable() +{ + return new IdentifierTable; +} + +void deleteIdentifierTable(IdentifierTable* table) +{ + delete table; +} + +bool Identifier::equal(const UString::Rep* r, const char* s) +{ + int length = r->length(); + const UChar* d = r->characters(); + for (int i = 0; i != length; ++i) + if (d[i] != (unsigned char)s[i]) + return false; + return s[length] == 0; +} + +bool Identifier::equal(const UString::Rep* r, const UChar* s, unsigned length) +{ + if (r->length() != length) + return false; + const UChar* d = r->characters(); + for (unsigned i = 0; i != length; ++i) + if (d[i] != s[i]) + return false; + return true; +} + +struct IdentifierCStringTranslator { + static unsigned hash(const char* c) + { + return UString::Rep::computeHash(c); + } + + static bool equal(UString::Rep* r, const char* s) + { + return Identifier::equal(r, s); + } + + static void translate(UString::Rep*& location, const char* c, unsigned hash) + { + size_t length = strlen(c); + UChar* d; + UString::Rep* r = UString::Rep::createUninitialized(length, d).releaseRef(); + for (size_t i = 0; i != length; i++) + d[i] = static_cast(c[i]); // use unsigned char to zero-extend instead of sign-extend + r->setHash(hash); + location = r; + } +}; + +PassRefPtr Identifier::add(JSGlobalData* globalData, const char* c) +{ + if (!c) + return UString::null().rep(); + if (!c[0]) + return UString::Rep::empty(); + if (!c[1]) + return add(globalData, globalData->smallStrings.singleCharacterStringRep(static_cast(c[0]))); + + IdentifierTable& identifierTable = *globalData->identifierTable; + LiteralIdentifierTable& literalIdentifierTable = identifierTable.literalTable(); + + const LiteralIdentifierTable::iterator& iter = literalIdentifierTable.find(c); + if (iter != literalIdentifierTable.end()) + return iter->second; + + pair::iterator, bool> addResult = identifierTable.add(c); + + // If the string is newly-translated, then we need to adopt it. + // The boolean in the pair tells us if that is so. + RefPtr addedString = addResult.second ? adoptRef(*addResult.first) : *addResult.first; + + literalIdentifierTable.add(c, addedString.get()); + + return addedString.release(); +} + +PassRefPtr Identifier::add(ExecState* exec, const char* c) +{ + return add(&exec->globalData(), c); +} + +struct UCharBuffer { + const UChar* s; + unsigned int length; +}; + +struct IdentifierUCharBufferTranslator { + static unsigned hash(const UCharBuffer& buf) + { + return UString::Rep::computeHash(buf.s, buf.length); + } + + static bool equal(UString::Rep* str, const UCharBuffer& buf) + { + return Identifier::equal(str, buf.s, buf.length); + } + + static void translate(UString::Rep*& location, const UCharBuffer& buf, unsigned hash) + { + UChar* d; + UString::Rep* r = UString::Rep::createUninitialized(buf.length, d).releaseRef(); + for (unsigned i = 0; i != buf.length; i++) + d[i] = buf.s[i]; + r->setHash(hash); + location = r; + } +}; + +PassRefPtr Identifier::add(JSGlobalData* globalData, const UChar* s, int length) +{ + if (length == 1) { + UChar c = s[0]; + if (c <= 0xFF) + return add(globalData, globalData->smallStrings.singleCharacterStringRep(c)); + } + if (!length) + return UString::Rep::empty(); + UCharBuffer buf = {s, length}; + pair::iterator, bool> addResult = globalData->identifierTable->add(buf); + + // If the string is newly-translated, then we need to adopt it. + // The boolean in the pair tells us if that is so. + return addResult.second ? adoptRef(*addResult.first) : *addResult.first; +} + +PassRefPtr Identifier::add(ExecState* exec, const UChar* s, int length) +{ + return add(&exec->globalData(), s, length); +} + +PassRefPtr Identifier::addSlowCase(JSGlobalData* globalData, UString::Rep* r) +{ + ASSERT(!r->isIdentifier()); + // The empty & null strings are static singletons, and static strings are handled + // in ::add() in the header, so we should never get here with a zero length string. + ASSERT(r->length()); + + if (r->length() == 1) { + UChar c = r->characters()[0]; + if (c <= 0xFF) + r = globalData->smallStrings.singleCharacterStringRep(c); + if (r->isIdentifier()) + return r; + } + + return *globalData->identifierTable->add(r).first; +} + +PassRefPtr Identifier::addSlowCase(ExecState* exec, UString::Rep* r) +{ + return addSlowCase(&exec->globalData(), r); +} + +Identifier Identifier::from(ExecState* exec, unsigned value) +{ + return Identifier(exec, exec->globalData().numericStrings.add(value)); +} + +Identifier Identifier::from(ExecState* exec, int value) +{ + return Identifier(exec, exec->globalData().numericStrings.add(value)); +} + +Identifier Identifier::from(ExecState* exec, double value) +{ + return Identifier(exec, exec->globalData().numericStrings.add(value)); +} + +Identifier Identifier::from(JSGlobalData* globalData, unsigned value) +{ + return Identifier(globalData, globalData->numericStrings.add(value)); +} + +Identifier Identifier::from(JSGlobalData* globalData, int value) +{ + return Identifier(globalData, globalData->numericStrings.add(value)); +} + +Identifier Identifier::from(JSGlobalData* globalData, double value) +{ + return Identifier(globalData, globalData->numericStrings.add(value)); +} + +#ifndef NDEBUG + +void Identifier::checkCurrentIdentifierTable(JSGlobalData* globalData) +{ + // Check the identifier table accessible through the threadspecific matches the + // globalData's identifier table. + ASSERT_UNUSED(globalData, globalData->identifierTable == wtfThreadData().currentIdentifierTable()); +} + +void Identifier::checkCurrentIdentifierTable(ExecState* exec) +{ + checkCurrentIdentifierTable(&exec->globalData()); +} + +#else + +// These only exists so that our exports are the same for debug and release builds. +// This would be an ASSERT_NOT_REACHED(), but we're in NDEBUG only code here! +void Identifier::checkCurrentIdentifierTable(JSGlobalData*) { CRASH(); } +void Identifier::checkCurrentIdentifierTable(ExecState*) { CRASH(); } + +#endif + +} // namespace JSC