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Lexer.cpp
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/*
* Copyright (C) 1999-2000 Harri Porten (porten@kde.org)
* Copyright (C) 2006-2024 Apple Inc. All Rights Reserved.
* Copyright (C) 2007 Cameron Zwarich (cwzwarich@uwaterloo.ca)
* Copyright (C) 2010 Zoltan Herczeg (zherczeg@inf.u-szeged.hu)
* Copyright (C) 2012 Mathias Bynens (mathias@qiwi.be)
*
* 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 "Lexer.h"
#include "BuiltinNames.h"
#include "Identifier.h"
#include "KeywordLookup.h"
#include "Lexer.lut.h"
#include "ParseInt.h"
#include <limits.h>
#include <string.h>
#include <variant>
#include <wtf/Assertions.h>
#include <wtf/HexNumber.h>
#include <wtf/dtoa.h>
#include <wtf/text/MakeString.h>
WTF_ALLOW_UNSAFE_BUFFER_USAGE_BEGIN
namespace JSC {
bool isLexerKeyword(const Identifier& identifier)
{
return JSC::mainTable.entry(identifier);
}
enum CharacterType : uint8_t {
// Types for the main switch
// The first three types are fixed, and also used for identifying
// ASCII alpha and alphanumeric characters (see isIdentStart and isIdentPart).
CharacterIdentifierStart,
CharacterZero,
CharacterNumber,
// For single-byte characters grandfathered into Other_ID_Continue -- namely just U+00B7 MIDDLE DOT.
// (http://unicode.org/reports/tr31/#Backward_Compatibility)
CharacterOtherIdentifierPart,
CharacterInvalid,
CharacterLineTerminator,
CharacterExclamationMark,
CharacterOpenParen,
CharacterCloseParen,
CharacterOpenBracket,
CharacterCloseBracket,
CharacterComma,
CharacterColon,
CharacterQuestion,
CharacterTilde,
CharacterQuote,
CharacterBackQuote,
CharacterDot,
CharacterSlash,
CharacterBackSlash,
CharacterSemicolon,
CharacterOpenBrace,
CharacterCloseBrace,
CharacterAdd,
CharacterSub,
CharacterMultiply,
CharacterModulo,
CharacterAnd,
CharacterXor,
CharacterOr,
CharacterLess,
CharacterGreater,
CharacterEqual,
// Other types (only one so far)
CharacterWhiteSpace,
CharacterHash,
CharacterPrivateIdentifierStart
};
// 256 Latin-1 codes
static constexpr const CharacterType typesOfLatin1Characters[256] = {
/* 0 - Null */ CharacterInvalid,
/* 1 - Start of Heading */ CharacterInvalid,
/* 2 - Start of Text */ CharacterInvalid,
/* 3 - End of Text */ CharacterInvalid,
/* 4 - End of Transm. */ CharacterInvalid,
/* 5 - Enquiry */ CharacterInvalid,
/* 6 - Acknowledgment */ CharacterInvalid,
/* 7 - Bell */ CharacterInvalid,
/* 8 - Back Space */ CharacterInvalid,
/* 9 - Horizontal Tab */ CharacterWhiteSpace,
/* 10 - Line Feed */ CharacterLineTerminator,
/* 11 - Vertical Tab */ CharacterWhiteSpace,
/* 12 - Form Feed */ CharacterWhiteSpace,
/* 13 - Carriage Return */ CharacterLineTerminator,
/* 14 - Shift Out */ CharacterInvalid,
/* 15 - Shift In */ CharacterInvalid,
/* 16 - Data Line Escape */ CharacterInvalid,
/* 17 - Device Control 1 */ CharacterInvalid,
/* 18 - Device Control 2 */ CharacterInvalid,
/* 19 - Device Control 3 */ CharacterInvalid,
/* 20 - Device Control 4 */ CharacterInvalid,
/* 21 - Negative Ack. */ CharacterInvalid,
/* 22 - Synchronous Idle */ CharacterInvalid,
/* 23 - End of Transmit */ CharacterInvalid,
/* 24 - Cancel */ CharacterInvalid,
/* 25 - End of Medium */ CharacterInvalid,
/* 26 - Substitute */ CharacterInvalid,
/* 27 - Escape */ CharacterInvalid,
/* 28 - File Separator */ CharacterInvalid,
/* 29 - Group Separator */ CharacterInvalid,
/* 30 - Record Separator */ CharacterInvalid,
/* 31 - Unit Separator */ CharacterInvalid,
/* 32 - Space */ CharacterWhiteSpace,
/* 33 - ! */ CharacterExclamationMark,
/* 34 - " */ CharacterQuote,
/* 35 - # */ CharacterHash,
/* 36 - $ */ CharacterIdentifierStart,
/* 37 - % */ CharacterModulo,
/* 38 - & */ CharacterAnd,
/* 39 - ' */ CharacterQuote,
/* 40 - ( */ CharacterOpenParen,
/* 41 - ) */ CharacterCloseParen,
/* 42 - * */ CharacterMultiply,
/* 43 - + */ CharacterAdd,
/* 44 - , */ CharacterComma,
/* 45 - - */ CharacterSub,
/* 46 - . */ CharacterDot,
/* 47 - / */ CharacterSlash,
/* 48 - 0 */ CharacterZero,
/* 49 - 1 */ CharacterNumber,
/* 50 - 2 */ CharacterNumber,
/* 51 - 3 */ CharacterNumber,
/* 52 - 4 */ CharacterNumber,
/* 53 - 5 */ CharacterNumber,
/* 54 - 6 */ CharacterNumber,
/* 55 - 7 */ CharacterNumber,
/* 56 - 8 */ CharacterNumber,
/* 57 - 9 */ CharacterNumber,
/* 58 - : */ CharacterColon,
/* 59 - ; */ CharacterSemicolon,
/* 60 - < */ CharacterLess,
/* 61 - = */ CharacterEqual,
/* 62 - > */ CharacterGreater,
/* 63 - ? */ CharacterQuestion,
/* 64 - @ */ CharacterPrivateIdentifierStart,
/* 65 - A */ CharacterIdentifierStart,
/* 66 - B */ CharacterIdentifierStart,
/* 67 - C */ CharacterIdentifierStart,
/* 68 - D */ CharacterIdentifierStart,
/* 69 - E */ CharacterIdentifierStart,
/* 70 - F */ CharacterIdentifierStart,
/* 71 - G */ CharacterIdentifierStart,
/* 72 - H */ CharacterIdentifierStart,
/* 73 - I */ CharacterIdentifierStart,
/* 74 - J */ CharacterIdentifierStart,
/* 75 - K */ CharacterIdentifierStart,
/* 76 - L */ CharacterIdentifierStart,
/* 77 - M */ CharacterIdentifierStart,
/* 78 - N */ CharacterIdentifierStart,
/* 79 - O */ CharacterIdentifierStart,
/* 80 - P */ CharacterIdentifierStart,
/* 81 - Q */ CharacterIdentifierStart,
/* 82 - R */ CharacterIdentifierStart,
/* 83 - S */ CharacterIdentifierStart,
/* 84 - T */ CharacterIdentifierStart,
/* 85 - U */ CharacterIdentifierStart,
/* 86 - V */ CharacterIdentifierStart,
/* 87 - W */ CharacterIdentifierStart,
/* 88 - X */ CharacterIdentifierStart,
/* 89 - Y */ CharacterIdentifierStart,
/* 90 - Z */ CharacterIdentifierStart,
/* 91 - [ */ CharacterOpenBracket,
/* 92 - \ */ CharacterBackSlash,
/* 93 - ] */ CharacterCloseBracket,
/* 94 - ^ */ CharacterXor,
/* 95 - _ */ CharacterIdentifierStart,
/* 96 - ` */ CharacterBackQuote,
/* 97 - a */ CharacterIdentifierStart,
/* 98 - b */ CharacterIdentifierStart,
/* 99 - c */ CharacterIdentifierStart,
/* 100 - d */ CharacterIdentifierStart,
/* 101 - e */ CharacterIdentifierStart,
/* 102 - f */ CharacterIdentifierStart,
/* 103 - g */ CharacterIdentifierStart,
/* 104 - h */ CharacterIdentifierStart,
/* 105 - i */ CharacterIdentifierStart,
/* 106 - j */ CharacterIdentifierStart,
/* 107 - k */ CharacterIdentifierStart,
/* 108 - l */ CharacterIdentifierStart,
/* 109 - m */ CharacterIdentifierStart,
/* 110 - n */ CharacterIdentifierStart,
/* 111 - o */ CharacterIdentifierStart,
/* 112 - p */ CharacterIdentifierStart,
/* 113 - q */ CharacterIdentifierStart,
/* 114 - r */ CharacterIdentifierStart,
/* 115 - s */ CharacterIdentifierStart,
/* 116 - t */ CharacterIdentifierStart,
/* 117 - u */ CharacterIdentifierStart,
/* 118 - v */ CharacterIdentifierStart,
/* 119 - w */ CharacterIdentifierStart,
/* 120 - x */ CharacterIdentifierStart,
/* 121 - y */ CharacterIdentifierStart,
/* 122 - z */ CharacterIdentifierStart,
/* 123 - { */ CharacterOpenBrace,
/* 124 - | */ CharacterOr,
/* 125 - } */ CharacterCloseBrace,
/* 126 - ~ */ CharacterTilde,
/* 127 - Delete */ CharacterInvalid,
/* 128 - Cc category */ CharacterInvalid,
/* 129 - Cc category */ CharacterInvalid,
/* 130 - Cc category */ CharacterInvalid,
/* 131 - Cc category */ CharacterInvalid,
/* 132 - Cc category */ CharacterInvalid,
/* 133 - Cc category */ CharacterInvalid,
/* 134 - Cc category */ CharacterInvalid,
/* 135 - Cc category */ CharacterInvalid,
/* 136 - Cc category */ CharacterInvalid,
/* 137 - Cc category */ CharacterInvalid,
/* 138 - Cc category */ CharacterInvalid,
/* 139 - Cc category */ CharacterInvalid,
/* 140 - Cc category */ CharacterInvalid,
/* 141 - Cc category */ CharacterInvalid,
/* 142 - Cc category */ CharacterInvalid,
/* 143 - Cc category */ CharacterInvalid,
/* 144 - Cc category */ CharacterInvalid,
/* 145 - Cc category */ CharacterInvalid,
/* 146 - Cc category */ CharacterInvalid,
/* 147 - Cc category */ CharacterInvalid,
/* 148 - Cc category */ CharacterInvalid,
/* 149 - Cc category */ CharacterInvalid,
/* 150 - Cc category */ CharacterInvalid,
/* 151 - Cc category */ CharacterInvalid,
/* 152 - Cc category */ CharacterInvalid,
/* 153 - Cc category */ CharacterInvalid,
/* 154 - Cc category */ CharacterInvalid,
/* 155 - Cc category */ CharacterInvalid,
/* 156 - Cc category */ CharacterInvalid,
/* 157 - Cc category */ CharacterInvalid,
/* 158 - Cc category */ CharacterInvalid,
/* 159 - Cc category */ CharacterInvalid,
/* 160 - Zs category (nbsp) */ CharacterWhiteSpace,
/* 161 - Po category */ CharacterInvalid,
/* 162 - Sc category */ CharacterInvalid,
/* 163 - Sc category */ CharacterInvalid,
/* 164 - Sc category */ CharacterInvalid,
/* 165 - Sc category */ CharacterInvalid,
/* 166 - So category */ CharacterInvalid,
/* 167 - So category */ CharacterInvalid,
/* 168 - Sk category */ CharacterInvalid,
/* 169 - So category */ CharacterInvalid,
/* 170 - Ll category */ CharacterIdentifierStart,
/* 171 - Pi category */ CharacterInvalid,
/* 172 - Sm category */ CharacterInvalid,
/* 173 - Cf category */ CharacterInvalid,
/* 174 - So category */ CharacterInvalid,
/* 175 - Sk category */ CharacterInvalid,
/* 176 - So category */ CharacterInvalid,
/* 177 - Sm category */ CharacterInvalid,
/* 178 - No category */ CharacterInvalid,
/* 179 - No category */ CharacterInvalid,
/* 180 - Sk category */ CharacterInvalid,
/* 181 - Ll category */ CharacterIdentifierStart,
/* 182 - So category */ CharacterInvalid,
/* 183 - Po category */ CharacterOtherIdentifierPart,
/* 184 - Sk category */ CharacterInvalid,
/* 185 - No category */ CharacterInvalid,
/* 186 - Ll category */ CharacterIdentifierStart,
/* 187 - Pf category */ CharacterInvalid,
/* 188 - No category */ CharacterInvalid,
/* 189 - No category */ CharacterInvalid,
/* 190 - No category */ CharacterInvalid,
/* 191 - Po category */ CharacterInvalid,
/* 192 - Lu category */ CharacterIdentifierStart,
/* 193 - Lu category */ CharacterIdentifierStart,
/* 194 - Lu category */ CharacterIdentifierStart,
/* 195 - Lu category */ CharacterIdentifierStart,
/* 196 - Lu category */ CharacterIdentifierStart,
/* 197 - Lu category */ CharacterIdentifierStart,
/* 198 - Lu category */ CharacterIdentifierStart,
/* 199 - Lu category */ CharacterIdentifierStart,
/* 200 - Lu category */ CharacterIdentifierStart,
/* 201 - Lu category */ CharacterIdentifierStart,
/* 202 - Lu category */ CharacterIdentifierStart,
/* 203 - Lu category */ CharacterIdentifierStart,
/* 204 - Lu category */ CharacterIdentifierStart,
/* 205 - Lu category */ CharacterIdentifierStart,
/* 206 - Lu category */ CharacterIdentifierStart,
/* 207 - Lu category */ CharacterIdentifierStart,
/* 208 - Lu category */ CharacterIdentifierStart,
/* 209 - Lu category */ CharacterIdentifierStart,
/* 210 - Lu category */ CharacterIdentifierStart,
/* 211 - Lu category */ CharacterIdentifierStart,
/* 212 - Lu category */ CharacterIdentifierStart,
/* 213 - Lu category */ CharacterIdentifierStart,
/* 214 - Lu category */ CharacterIdentifierStart,
/* 215 - Sm category */ CharacterInvalid,
/* 216 - Lu category */ CharacterIdentifierStart,
/* 217 - Lu category */ CharacterIdentifierStart,
/* 218 - Lu category */ CharacterIdentifierStart,
/* 219 - Lu category */ CharacterIdentifierStart,
/* 220 - Lu category */ CharacterIdentifierStart,
/* 221 - Lu category */ CharacterIdentifierStart,
/* 222 - Lu category */ CharacterIdentifierStart,
/* 223 - Ll category */ CharacterIdentifierStart,
/* 224 - Ll category */ CharacterIdentifierStart,
/* 225 - Ll category */ CharacterIdentifierStart,
/* 226 - Ll category */ CharacterIdentifierStart,
/* 227 - Ll category */ CharacterIdentifierStart,
/* 228 - Ll category */ CharacterIdentifierStart,
/* 229 - Ll category */ CharacterIdentifierStart,
/* 230 - Ll category */ CharacterIdentifierStart,
/* 231 - Ll category */ CharacterIdentifierStart,
/* 232 - Ll category */ CharacterIdentifierStart,
/* 233 - Ll category */ CharacterIdentifierStart,
/* 234 - Ll category */ CharacterIdentifierStart,
/* 235 - Ll category */ CharacterIdentifierStart,
/* 236 - Ll category */ CharacterIdentifierStart,
/* 237 - Ll category */ CharacterIdentifierStart,
/* 238 - Ll category */ CharacterIdentifierStart,
/* 239 - Ll category */ CharacterIdentifierStart,
/* 240 - Ll category */ CharacterIdentifierStart,
/* 241 - Ll category */ CharacterIdentifierStart,
/* 242 - Ll category */ CharacterIdentifierStart,
/* 243 - Ll category */ CharacterIdentifierStart,
/* 244 - Ll category */ CharacterIdentifierStart,
/* 245 - Ll category */ CharacterIdentifierStart,
/* 246 - Ll category */ CharacterIdentifierStart,
/* 247 - Sm category */ CharacterInvalid,
/* 248 - Ll category */ CharacterIdentifierStart,
/* 249 - Ll category */ CharacterIdentifierStart,
/* 250 - Ll category */ CharacterIdentifierStart,
/* 251 - Ll category */ CharacterIdentifierStart,
/* 252 - Ll category */ CharacterIdentifierStart,
/* 253 - Ll category */ CharacterIdentifierStart,
/* 254 - Ll category */ CharacterIdentifierStart,
/* 255 - Ll category */ CharacterIdentifierStart
};
// This table provides the character that results from \X where X is the index in the table beginning
// with SPACE. A table value of 0 means that more processing needs to be done.
static constexpr const LChar singleCharacterEscapeValuesForASCII[128] = {
/* 0 - Null */ 0,
/* 1 - Start of Heading */ 0,
/* 2 - Start of Text */ 0,
/* 3 - End of Text */ 0,
/* 4 - End of Transm. */ 0,
/* 5 - Enquiry */ 0,
/* 6 - Acknowledgment */ 0,
/* 7 - Bell */ 0,
/* 8 - Back Space */ 0,
/* 9 - Horizontal Tab */ 0,
/* 10 - Line Feed */ 0,
/* 11 - Vertical Tab */ 0,
/* 12 - Form Feed */ 0,
/* 13 - Carriage Return */ 0,
/* 14 - Shift Out */ 0,
/* 15 - Shift In */ 0,
/* 16 - Data Line Escape */ 0,
/* 17 - Device Control 1 */ 0,
/* 18 - Device Control 2 */ 0,
/* 19 - Device Control 3 */ 0,
/* 20 - Device Control 4 */ 0,
/* 21 - Negative Ack. */ 0,
/* 22 - Synchronous Idle */ 0,
/* 23 - End of Transmit */ 0,
/* 24 - Cancel */ 0,
/* 25 - End of Medium */ 0,
/* 26 - Substitute */ 0,
/* 27 - Escape */ 0,
/* 28 - File Separator */ 0,
/* 29 - Group Separator */ 0,
/* 30 - Record Separator */ 0,
/* 31 - Unit Separator */ 0,
/* 32 - Space */ ' ',
/* 33 - ! */ '!',
/* 34 - " */ '"',
/* 35 - # */ '#',
/* 36 - $ */ '$',
/* 37 - % */ '%',
/* 38 - & */ '&',
/* 39 - ' */ '\'',
/* 40 - ( */ '(',
/* 41 - ) */ ')',
/* 42 - * */ '*',
/* 43 - + */ '+',
/* 44 - , */ ',',
/* 45 - - */ '-',
/* 46 - . */ '.',
/* 47 - / */ '/',
/* 48 - 0 */ 0,
/* 49 - 1 */ 0,
/* 50 - 2 */ 0,
/* 51 - 3 */ 0,
/* 52 - 4 */ 0,
/* 53 - 5 */ 0,
/* 54 - 6 */ 0,
/* 55 - 7 */ 0,
/* 56 - 8 */ 0,
/* 57 - 9 */ 0,
/* 58 - : */ ':',
/* 59 - ; */ ';',
/* 60 - < */ '<',
/* 61 - = */ '=',
/* 62 - > */ '>',
/* 63 - ? */ '?',
/* 64 - @ */ '@',
/* 65 - A */ 'A',
/* 66 - B */ 'B',
/* 67 - C */ 'C',
/* 68 - D */ 'D',
/* 69 - E */ 'E',
/* 70 - F */ 'F',
/* 71 - G */ 'G',
/* 72 - H */ 'H',
/* 73 - I */ 'I',
/* 74 - J */ 'J',
/* 75 - K */ 'K',
/* 76 - L */ 'L',
/* 77 - M */ 'M',
/* 78 - N */ 'N',
/* 79 - O */ 'O',
/* 80 - P */ 'P',
/* 81 - Q */ 'Q',
/* 82 - R */ 'R',
/* 83 - S */ 'S',
/* 84 - T */ 'T',
/* 85 - U */ 'U',
/* 86 - V */ 'V',
/* 87 - W */ 'W',
/* 88 - X */ 'X',
/* 89 - Y */ 'Y',
/* 90 - Z */ 'Z',
/* 91 - [ */ '[',
/* 92 - \ */ '\\',
/* 93 - ] */ ']',
/* 94 - ^ */ '^',
/* 95 - _ */ '_',
/* 96 - ` */ '`',
/* 97 - a */ 'a',
/* 98 - b */ 0x08,
/* 99 - c */ 'c',
/* 100 - d */ 'd',
/* 101 - e */ 'e',
/* 102 - f */ 0x0C,
/* 103 - g */ 'g',
/* 104 - h */ 'h',
/* 105 - i */ 'i',
/* 106 - j */ 'j',
/* 107 - k */ 'k',
/* 108 - l */ 'l',
/* 109 - m */ 'm',
/* 110 - n */ 0x0A,
/* 111 - o */ 'o',
/* 112 - p */ 'p',
/* 113 - q */ 'q',
/* 114 - r */ 0x0D,
/* 115 - s */ 's',
/* 116 - t */ 0x09,
/* 117 - u */ 0,
/* 118 - v */ 0x0B,
/* 119 - w */ 'w',
/* 120 - x */ 0,
/* 121 - y */ 'y',
/* 122 - z */ 'z',
/* 123 - { */ '{',
/* 124 - | */ '|',
/* 125 - } */ '}',
/* 126 - ~ */ '~',
/* 127 - Delete */ 0
};
template <typename T>
Lexer<T>::Lexer(VM& vm, JSParserBuiltinMode builtinMode, JSParserScriptMode scriptMode)
: m_positionBeforeLastNewline(0,0,0)
, m_isReparsingFunction(false)
, m_vm(vm)
, m_parsingBuiltinFunction(builtinMode == JSParserBuiltinMode::Builtin || Options::exposePrivateIdentifiers())
, m_scriptMode(scriptMode)
{
}
static inline JSTokenType tokenTypeForIntegerLikeToken(double doubleValue)
{
if ((doubleValue || !std::signbit(doubleValue)) && static_cast<int64_t>(doubleValue) == doubleValue)
return INTEGER;
return DOUBLE;
}
template <typename T>
Lexer<T>::~Lexer()
{
}
template <typename T>
String Lexer<T>::invalidCharacterMessage() const
{
switch (m_current) {
case 0:
return "Invalid character: '\\0'"_s;
case 10:
return "Invalid character: '\\n'"_s;
case 11:
return "Invalid character: '\\v'"_s;
case 13:
return "Invalid character: '\\r'"_s;
case 35:
return "Invalid character: '#'"_s;
case 64:
return "Invalid character: '@'"_s;
case 96:
return "Invalid character: '`'"_s;
default:
return makeString("Invalid character '\\u"_s, hex(m_current, 4, Lowercase), '\'');
}
}
template <typename T>
ALWAYS_INLINE const T* Lexer<T>::currentSourcePtr() const
{
ASSERT(m_code <= m_codeEnd);
return m_code;
}
template <typename T>
void Lexer<T>::setCode(const SourceCode& source, ParserArena* arena)
{
m_arena = &arena->identifierArena();
m_lineNumber = source.firstLine().oneBasedInt();
m_lastToken = -1;
StringView sourceString = source.provider()->source();
if (!sourceString.isNull())
setCodeStart(sourceString);
else
m_codeStart = nullptr;
m_source = &source;
m_sourceOffset = source.startOffset();
m_codeStartPlusOffset = m_codeStart + source.startOffset();
m_code = m_codeStartPlusOffset;
m_codeEnd = m_codeStart + source.endOffset();
m_error = false;
m_atLineStart = true;
m_lineStart = m_code;
m_lexErrorMessage = String();
m_sourceURLDirective = String();
m_sourceMappingURLDirective = String();
m_buffer8.reserveInitialCapacity(initialReadBufferCapacity);
m_buffer16.reserveInitialCapacity(initialReadBufferCapacity);
m_bufferForRawTemplateString16.reserveInitialCapacity(initialReadBufferCapacity);
if (LIKELY(m_code < m_codeEnd))
m_current = *m_code;
else
m_current = 0;
ASSERT(currentOffset() == source.startOffset());
}
template <typename T>
template <int shiftAmount> ALWAYS_INLINE void Lexer<T>::internalShift()
{
m_code += shiftAmount;
ASSERT(currentOffset() >= currentLineStartOffset());
m_current = *m_code;
}
template <typename T>
ALWAYS_INLINE void Lexer<T>::shift()
{
// At one point timing showed that setting m_current to 0 unconditionally was faster than an if-else sequence.
m_current = 0;
++m_code;
if (LIKELY(m_code < m_codeEnd))
m_current = *m_code;
}
template <typename T>
ALWAYS_INLINE bool Lexer<T>::atEnd() const
{
ASSERT(!m_current || m_code < m_codeEnd);
return UNLIKELY(UNLIKELY(!m_current) && m_code == m_codeEnd);
}
template <typename T>
ALWAYS_INLINE T Lexer<T>::peek(int offset) const
{
ASSERT(offset > 0 && offset < 5);
const T* code = m_code + offset;
return (code < m_codeEnd) ? *code : 0;
}
struct ParsedUnicodeEscapeValue {
ParsedUnicodeEscapeValue(char32_t value)
: m_value(value)
{
ASSERT(isValid());
}
enum SpecialValueType : char32_t { Incomplete = 0xFFFFFFFEu, Invalid = 0xFFFFFFFFu };
ParsedUnicodeEscapeValue(SpecialValueType type)
: m_value(type)
{
}
bool isValid() const { return m_value != Incomplete && m_value != Invalid; }
bool isIncomplete() const { return m_value == Incomplete; }
char32_t value() const
{
ASSERT(isValid());
return m_value;
}
private:
char32_t m_value;
};
template<typename CharacterType>
ParsedUnicodeEscapeValue Lexer<CharacterType>::parseUnicodeEscape()
{
if (m_current == '{') {
shift();
char32_t codePoint = 0;
do {
if (!isASCIIHexDigit(m_current))
return m_current ? ParsedUnicodeEscapeValue::Invalid : ParsedUnicodeEscapeValue::Incomplete;
codePoint = (codePoint << 4) | toASCIIHexValue(m_current);
if (codePoint > UCHAR_MAX_VALUE) {
// For raw template literal syntax, we consume `NotEscapeSequence`.
// Here, we consume NotCodePoint's HexDigits.
//
// NotEscapeSequence ::
// u { [lookahread not one of HexDigit]
// u { NotCodePoint
// u { CodePoint [lookahead != }]
//
// NotCodePoint ::
// HexDigits but not if MV of HexDigits <= 0x10FFFF
//
// CodePoint ::
// HexDigits but not if MV of HexDigits > 0x10FFFF
shift();
while (isASCIIHexDigit(m_current))
shift();
return atEnd() ? ParsedUnicodeEscapeValue::Incomplete : ParsedUnicodeEscapeValue::Invalid;
}
shift();
} while (m_current != '}');
shift();
return codePoint;
}
auto character2 = peek(1);
auto character3 = peek(2);
auto character4 = peek(3);
if (UNLIKELY(!isASCIIHexDigit(m_current) || !isASCIIHexDigit(character2) || !isASCIIHexDigit(character3) || !isASCIIHexDigit(character4))) {
auto result = (m_code + 4) >= m_codeEnd ? ParsedUnicodeEscapeValue::Incomplete : ParsedUnicodeEscapeValue::Invalid;
// For raw template literal syntax, we consume `NotEscapeSequence`.
//
// NotEscapeSequence ::
// u [lookahead not one of HexDigit][lookahead != {]
// u HexDigit [lookahead not one of HexDigit]
// u HexDigit HexDigit [lookahead not one of HexDigit]
// u HexDigit HexDigit HexDigit [lookahead not one of HexDigit]
while (isASCIIHexDigit(m_current))
shift();
return result;
}
auto result = convertUnicode(m_current, character2, character3, character4);
shift();
shift();
shift();
shift();
return result;
}
template <typename T>
void Lexer<T>::shiftLineTerminator()
{
ASSERT(isLineTerminator(m_current));
m_positionBeforeLastNewline = currentPosition();
T prev = m_current;
shift();
if (prev == '\r' && m_current == '\n')
shift();
++m_lineNumber;
m_lineStart = m_code;
}
template <typename T>
ALWAYS_INLINE bool Lexer<T>::lastTokenWasRestrKeyword() const
{
return m_lastToken == CONTINUE || m_lastToken == BREAK || m_lastToken == RETURN || m_lastToken == THROW;
}
template <typename T>
ALWAYS_INLINE void Lexer<T>::skipWhitespace()
{
while (isWhiteSpace(m_current))
shift();
}
static bool isNonLatin1IdentStart(char32_t c)
{
return u_hasBinaryProperty(c, UCHAR_ID_START);
}
template<typename CharacterType>
static ALWAYS_INLINE bool isIdentStart(CharacterType c)
{
static_assert(std::is_same_v<CharacterType, LChar> || std::is_same_v<CharacterType, char32_t>, "Call isSingleCharacterIdentStart for UChars that don't need to check for surrogate pairs");
if (!isLatin1(c))
return isNonLatin1IdentStart(c);
return typesOfLatin1Characters[static_cast<LChar>(c)] == CharacterIdentifierStart;
}
static ALWAYS_INLINE UNUSED_FUNCTION bool isSingleCharacterIdentStart(UChar c)
{
if (LIKELY(isLatin1(c)))
return isIdentStart(static_cast<LChar>(c));
return !U16_IS_SURROGATE(c) && isIdentStart(static_cast<char32_t>(c));
}
static ALWAYS_INLINE bool cannotBeIdentStart(LChar c)
{
return !isIdentStart(c) && c != '\\';
}
static ALWAYS_INLINE bool cannotBeIdentStart(UChar c)
{
if (LIKELY(isLatin1(c)))
return cannotBeIdentStart(static_cast<LChar>(c));
return Lexer<UChar>::isWhiteSpace(c) || Lexer<UChar>::isLineTerminator(c);
}
static NEVER_INLINE bool isNonLatin1IdentPart(char32_t c)
{
return u_hasBinaryProperty(c, UCHAR_ID_CONTINUE) || c == 0x200C || c == 0x200D;
}
template<typename CharacterType>
static ALWAYS_INLINE bool isIdentPart(CharacterType c)
{
static_assert(std::is_same_v<CharacterType, LChar> || std::is_same_v<CharacterType, char32_t>, "Call isSingleCharacterIdentPart for UChars that don't need to check for surrogate pairs");
if (!isLatin1(c))
return isNonLatin1IdentPart(c);
// Character types are divided into two groups depending on whether they can be part of an
// identifier or not. Those whose type value is less or equal than CharacterOtherIdentifierPart can be
// part of an identifier. (See the CharacterType definition for more details.)
return typesOfLatin1Characters[static_cast<LChar>(c)] <= CharacterOtherIdentifierPart;
}
static ALWAYS_INLINE bool isSingleCharacterIdentPart(UChar c)
{
if (LIKELY(isLatin1(c)))
return isIdentPart(static_cast<LChar>(c));
return !U16_IS_SURROGATE(c) && isIdentPart(static_cast<char32_t>(c));
}
static ALWAYS_INLINE bool cannotBeIdentPartOrEscapeStart(LChar c)
{
return !isIdentPart(c) && c != '\\';
}
// NOTE: This may give give false negatives (for non-ascii) but won't give false posititves.
// This means it can be used to detect the end of a keyword (all keywords are ascii)
static ALWAYS_INLINE bool cannotBeIdentPartOrEscapeStart(UChar c)
{
if (LIKELY(isLatin1(c)))
return cannotBeIdentPartOrEscapeStart(static_cast<LChar>(c));
return Lexer<UChar>::isWhiteSpace(c) || Lexer<UChar>::isLineTerminator(c);
}
template<>
ALWAYS_INLINE char32_t Lexer<LChar>::currentCodePoint() const
{
return m_current;
}
template<>
ALWAYS_INLINE char32_t Lexer<UChar>::currentCodePoint() const
{
ASSERT_WITH_MESSAGE(!isIdentStart(errorCodePoint), "error values shouldn't appear as a valid identifier start code point");
if (!U16_IS_SURROGATE(m_current))
return m_current;
UChar trail = peek(1);
if (UNLIKELY(!U16_IS_LEAD(m_current) || !U16_IS_SURROGATE_TRAIL(trail)))
return errorCodePoint;
return U16_GET_SUPPLEMENTARY(m_current, trail);
}
template<typename CharacterType>
static inline bool isASCIIDigitOrSeparator(CharacterType character)
{
return isASCIIDigit(character) || character == '_';
}
template<typename CharacterType>
static inline bool isASCIIHexDigitOrSeparator(CharacterType character)
{
return isASCIIHexDigit(character) || character == '_';
}
template<typename CharacterType>
static inline bool isASCIIBinaryDigitOrSeparator(CharacterType character)
{
return isASCIIBinaryDigit(character) || character == '_';
}
template<typename CharacterType>
static inline bool isASCIIOctalDigitOrSeparator(CharacterType character)
{
return isASCIIOctalDigit(character) || character == '_';
}
static inline LChar singleEscape(int c)
{
if (c < 128) {
ASSERT(static_cast<size_t>(c) < std::size(singleCharacterEscapeValuesForASCII));
return singleCharacterEscapeValuesForASCII[c];
}
return 0;
}
template <typename T>
inline void Lexer<T>::record8(int c)
{
ASSERT(isLatin1(c));
m_buffer8.append(static_cast<LChar>(c));
}
template <typename T>
inline void Lexer<T>::append8(std::span<const T> span)
{
size_t currentSize = m_buffer8.size();
m_buffer8.grow(currentSize + span.size());
LChar* rawBuffer = m_buffer8.data() + currentSize;
for (size_t i = 0; i < span.size(); i++) {
T c = span[i];
ASSERT(isLatin1(c));
rawBuffer[i] = c;
}
}
template <typename T>
inline void Lexer<T>::append16(std::span<const LChar> span)
{
size_t currentSize = m_buffer16.size();
m_buffer16.grow(currentSize + span.size());
UChar* rawBuffer = m_buffer16.data() + currentSize;
for (size_t i = 0; i < span.size(); i++)
rawBuffer[i] = span[i];
}
template <typename T>
inline void Lexer<T>::record16(T c)
{
m_buffer16.append(c);
}
template <typename T>
inline void Lexer<T>::record16(int c)
{
ASSERT(c >= 0);
ASSERT(c <= static_cast<int>(USHRT_MAX));
m_buffer16.append(static_cast<UChar>(c));
}
template<typename CharacterType> inline void Lexer<CharacterType>::recordUnicodeCodePoint(char32_t codePoint)
{
ASSERT(codePoint <= UCHAR_MAX_VALUE);
if (U_IS_BMP(codePoint))
record16(static_cast<UChar>(codePoint));
else {
UChar codeUnits[2] = { U16_LEAD(codePoint), U16_TRAIL(codePoint) };
append16(codeUnits);
}
}
#if ASSERT_ENABLED
bool isSafeBuiltinIdentifier(VM& vm, const Identifier* ident)
{
if (!ident)
return true;
/* Just block any use of suspicious identifiers. This is intended to
* be used as a safety net while implementing builtins.
*/
// FIXME: How can a debug-only assertion be a safety net?
if (*ident == vm.propertyNames->builtinNames().callPublicName())
return false;
if (*ident == vm.propertyNames->builtinNames().applyPublicName())
return false;
if (*ident == vm.propertyNames->eval)
return false;
if (*ident == vm.propertyNames->Function)
return false;
return true;
}
#endif // ASSERT_ENABLED
template <>
template <bool shouldCreateIdentifier> ALWAYS_INLINE JSTokenType Lexer<LChar>::parseIdentifier(JSTokenData* tokenData, OptionSet<LexerFlags> lexerFlags, bool strictMode)
{
tokenData->escaped = false;
const ptrdiff_t remaining = m_codeEnd - m_code;
if ((remaining >= maxTokenLength) && !lexerFlags.contains(LexerFlags::IgnoreReservedWords)) {
JSTokenType keyword = parseKeyword<shouldCreateIdentifier>(tokenData);
if (keyword != IDENT) {
ASSERT((!shouldCreateIdentifier) || tokenData->ident);
return keyword == RESERVED_IF_STRICT && !strictMode ? IDENT : keyword;
}
}
bool isPrivateName = m_current == '#';
bool isBuiltinName = m_current == '@' && m_parsingBuiltinFunction;
bool isWellKnownSymbol = false;
if (isBuiltinName) {
ASSERT(m_parsingBuiltinFunction);
shift();
if (m_current == '@') {
isWellKnownSymbol = true;
shift();
}
}
const LChar* identifierStart = currentSourcePtr();
if (isPrivateName)
shift();
ASSERT(isIdentStart(m_current) || m_current == '\\');
while (isIdentPart(m_current))
shift();
if (UNLIKELY(m_current == '\\'))
return parseIdentifierSlowCase<shouldCreateIdentifier>(tokenData, lexerFlags, strictMode, identifierStart);
const Identifier* ident = nullptr;
if (shouldCreateIdentifier || m_parsingBuiltinFunction) {
std::span identifierSpan { identifierStart, static_cast<size_t>(currentSourcePtr() - identifierStart) };
if (m_parsingBuiltinFunction && isBuiltinName) {
if (isWellKnownSymbol)
ident = &m_arena->makeIdentifier(m_vm, m_vm.propertyNames->builtinNames().lookUpWellKnownSymbol(identifierSpan));
else
ident = &m_arena->makeIdentifier(m_vm, m_vm.propertyNames->builtinNames().lookUpPrivateName(identifierSpan));
if (!ident)
return INVALID_PRIVATE_NAME_ERRORTOK;
} else {
ident = makeIdentifier(identifierSpan);
if (m_parsingBuiltinFunction) {
if (!isSafeBuiltinIdentifier(m_vm, ident)) {
m_lexErrorMessage = makeString("The use of '"_s, ident->string(), "' is disallowed in builtin functions."_s);
return ERRORTOK;
}
if (*ident == m_vm.propertyNames->undefinedKeyword)
tokenData->ident = &m_vm.propertyNames->undefinedPrivateName;
}
}
tokenData->ident = ident;
} else
tokenData->ident = nullptr;