#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 IdentifierCStringTranslator {
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));
LChar* d;
StringImpl* r = StringImpl::createUninitialized(length, d).leakRef();
for (size_t i = 0; i != length; i++)
d[i] = c[i];
r->setHash(hash);
location = r;
}
};
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)
{
if (!c)
return 0;
if (!c[0])
return StringImpl::empty();
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*, IdentifierCStringTranslator>(reinterpret_cast<const LChar*>(c));
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);
return addResult.isNewEntry ? adoptRef(*addResult.iterator) : *addResult.iterator;
}
template <typename CharType>
ALWAYS_INLINE uint32_t Identifier::toUInt32FromCharacters(const CharType* characters, unsigned length, bool& ok)
{
uint32_t value = characters[0] - '0';
if (value > 9)
return 0;
if (!value && length > 1)
return 0;
while (--length) {
if (value > 0xFFFFFFFFU / 10)
return 0;
value *= 10;
uint32_t newValue = *(++characters) - '0';
if (newValue > 9)
return 0;
newValue += value;
if (newValue < value)
return 0;
value = newValue;
}
ok = true;
return value;
}
uint32_t Identifier::toUInt32(const UString& string, bool& ok)
{
ok = false;
unsigned length = string.length();
if (!length)
return 0;
if (string.is8Bit())
return toUInt32FromCharacters(string.characters8(), length, ok);
return toUInt32FromCharacters(string.characters16(), length, ok);
}
PassRefPtr<StringImpl> Identifier::addSlowCase(JSGlobalData* globalData, StringImpl* r)
{
ASSERT(!r->isIdentifier());
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)
{
ASSERT_UNUSED(globalData, globalData->identifierTable == wtfThreadData().currentIdentifierTable());
}
void Identifier::checkCurrentIdentifierTable(ExecState* exec)
{
checkCurrentIdentifierTable(&exec->globalData());
}
#else
NO_RETURN_DUE_TO_CRASH void Identifier::checkCurrentIdentifierTable(JSGlobalData*) { CRASH(); }
NO_RETURN_DUE_TO_CRASH void Identifier::checkCurrentIdentifierTable(ExecState*) { CRASH(); }
#endif
}