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/*
* Copyright (C) 2003, 2004, 2005, 2006, 2007, 2008, 2012 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 "JSObject.h"
#include "NumericStrings.h"
#include "ScopeChain.h"
#include <new> // for placement new
#include <string.h> // for strlen
#include <wtf/Assertions.h>
#include <wtf/FastMalloc.h>
#include <wtf/HashSet.h>
#include <wtf/text/StringHash.h>
using WTF::ThreadSpecific;
namespace JSC {
IdentifierTable* createIdentifierTable()
{
return new IdentifierTable;
}
void deleteIdentifierTable(IdentifierTable* table)
{
delete table;
}
struct IdentifierASCIIStringTranslator {
static unsigned hash(const LChar* c)
{
return StringHasher::computeHashAndMaskTop8Bits<LChar>(c);
}
static bool equal(StringImpl* r, const LChar* s)
{
return Identifier::equal(r, s);
}
static void translate(StringImpl*& location, const LChar* c, unsigned hash)
{
size_t length = strlen(reinterpret_cast<const char*>(c));
location = StringImpl::createFromLiteral(reinterpret_cast<const char*>(c), length).leakRef();
location->setHash(hash);
}
};
struct IdentifierLCharFromUCharTranslator {
static unsigned hash(const CharBuffer<UChar>& buf)
{
return StringHasher::computeHashAndMaskTop8Bits<UChar>(buf.s, buf.length);
}
static bool equal(StringImpl* str, const CharBuffer<UChar>& buf)
{
return Identifier::equal(str, buf.s, buf.length);
}
static void translate(StringImpl*& location, const CharBuffer<UChar>& buf, unsigned hash)
{
LChar* d;
StringImpl* r = StringImpl::createUninitialized(buf.length, d).leakRef();
for (unsigned i = 0; i != buf.length; i++) {
UChar c = buf.s[i];
ASSERT(c <= 0xff);
d[i] = c;
}
r->setHash(hash);
location = r;
}
};
PassRefPtr<StringImpl> Identifier::add(JSGlobalData* globalData, const char* c)
{
ASSERT(c);
ASSERT(c[0]);
if (!c[1])
return add(globalData, globalData->smallStrings.singleCharacterStringRep(c[0]));
IdentifierTable& identifierTable = *globalData->identifierTable;
LiteralIdentifierTable& literalIdentifierTable = identifierTable.literalTable();
const LiteralIdentifierTable::iterator& iter = literalIdentifierTable.find(c);
if (iter != literalIdentifierTable.end())
return iter->second;
HashSet<StringImpl*>::AddResult addResult = identifierTable.add<const LChar*, IdentifierASCIIStringTranslator>(reinterpret_cast<const LChar*>(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<StringImpl> addedString = addResult.isNewEntry ? adoptRef(*addResult.iterator) : *addResult.iterator;
literalIdentifierTable.add(c, addedString.get());
return addedString.release();
}
PassRefPtr<StringImpl> Identifier::add(ExecState* exec, const char* c)
{
return add(&exec->globalData(), c);
}
PassRefPtr<StringImpl> Identifier::add8(JSGlobalData* globalData, const UChar* s, int length)
{
if (length == 1) {
UChar c = s[0];
ASSERT(c <= 0xff);
if (canUseSingleCharacterString(c))
return add(globalData, globalData->smallStrings.singleCharacterStringRep(c));
}
if (!length)
return StringImpl::empty();
CharBuffer<UChar> buf = {s, length};
HashSet<StringImpl*>::AddResult addResult = globalData->identifierTable->add<CharBuffer<UChar>, IdentifierLCharFromUCharTranslator >(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.isNewEntry ? adoptRef(*addResult.iterator) : *addResult.iterator;
}
PassRefPtr<StringImpl> Identifier::addSlowCase(JSGlobalData* globalData, StringImpl* 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)[0];
if (c <= maxSingleCharacterString)
r = globalData->smallStrings.singleCharacterStringRep(c);
if (r->isIdentifier())
return r;
}
return *globalData->identifierTable->add(r).iterator;
}
PassRefPtr<StringImpl> Identifier::addSlowCase(ExecState* exec, StringImpl* 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!
NO_RETURN_DUE_TO_CRASH void Identifier::checkCurrentIdentifierTable(JSGlobalData*) { CRASH(); }
NO_RETURN_DUE_TO_CRASH void Identifier::checkCurrentIdentifierTable(ExecState*) { CRASH(); }
#endif
} // namespace JSC
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