* Copyright (C) 1999-2000 Harri Porten (porten@kde.org)
* Copyright (C) 2006, 2007, 2008, 2009 Apple Inc. All Rights Reserved.
* Copyright (C) 2007 Cameron Zwarich (cwzwarich@uwaterloo.ca)
+ * Copyright (C) 2010 Zoltan Herczeg (zherczeg@inf.u-szeged.hu)
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Library General Public
#include "Lexer.h"
#include "JSFunction.h"
+
#include "JSGlobalObjectFunctions.h"
+#include "Identifier.h"
#include "NodeInfo.h"
#include "Nodes.h"
#include "dtoa.h"
using namespace WTF;
using namespace Unicode;
-// We can't specify the namespace in yacc's C output, so do it here instead.
-using namespace JSC;
-
-#include "Grammar.h"
+#include "JSParser.h"
+#include "KeywordLookup.h"
#include "Lookup.h"
#include "Lexer.lut.h"
namespace JSC {
-static const UChar byteOrderMark = 0xFEFF;
+
+enum CharacterType {
+ // 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,
+
+ CharacterInvalid,
+ CharacterLineTerminator,
+ CharacterExclamationMark,
+ CharacterOpenParen,
+ CharacterCloseParen,
+ CharacterOpenBracket,
+ CharacterCloseBracket,
+ CharacterComma,
+ CharacterColon,
+ CharacterQuestion,
+ CharacterTilde,
+ CharacterQuote,
+ CharacterDot,
+ CharacterSlash,
+ CharacterBackSlash,
+ CharacterSemicolon,
+ CharacterOpenBrace,
+ CharacterCloseBrace,
+
+ CharacterAdd,
+ CharacterSub,
+ CharacterMultiply,
+ CharacterModulo,
+ CharacterAnd,
+ CharacterXor,
+ CharacterOr,
+ CharacterLess,
+ CharacterGreater,
+ CharacterEqual,
+
+ // Other types (only one so far)
+ CharacterWhiteSpace,
+};
+
+// 128 ASCII codes
+static const unsigned short typesOfASCIICharacters[128] = {
+/* 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 - # */ CharacterInvalid,
+/* 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 - @ */ CharacterInvalid,
+/* 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 - ` */ CharacterInvalid,
+/* 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,
+};
Lexer::Lexer(JSGlobalData* globalData)
: m_isReparsing(false)
m_keywordTable.deleteTable();
}
-inline const UChar* Lexer::currentCharacter() const
+ALWAYS_INLINE const UChar* Lexer::currentCharacter() const
{
- return m_code - 4;
+ ASSERT(m_code <= m_codeEnd);
+ return m_code;
}
-inline int Lexer::currentOffset() const
+ALWAYS_INLINE int Lexer::currentOffset() const
{
return currentCharacter() - m_codeStart;
}
-ALWAYS_INLINE void Lexer::shift1()
-{
- m_current = m_next1;
- m_next1 = m_next2;
- m_next2 = m_next3;
- if (LIKELY(m_code < m_codeEnd))
- m_next3 = m_code[0];
- else
- m_next3 = -1;
-
- ++m_code;
-}
-
-ALWAYS_INLINE void Lexer::shift2()
-{
- m_current = m_next2;
- m_next1 = m_next3;
- if (LIKELY(m_code + 1 < m_codeEnd)) {
- m_next2 = m_code[0];
- m_next3 = m_code[1];
- } else {
- m_next2 = m_code < m_codeEnd ? m_code[0] : -1;
- m_next3 = -1;
- }
-
- m_code += 2;
-}
-
-ALWAYS_INLINE void Lexer::shift3()
-{
- m_current = m_next3;
- if (LIKELY(m_code + 2 < m_codeEnd)) {
- m_next1 = m_code[0];
- m_next2 = m_code[1];
- m_next3 = m_code[2];
- } else {
- m_next1 = m_code < m_codeEnd ? m_code[0] : -1;
- m_next2 = m_code + 1 < m_codeEnd ? m_code[1] : -1;
- m_next3 = -1;
- }
-
- m_code += 3;
-}
-
-ALWAYS_INLINE void Lexer::shift4()
-{
- if (LIKELY(m_code + 3 < m_codeEnd)) {
- m_current = m_code[0];
- m_next1 = m_code[1];
- m_next2 = m_code[2];
- m_next3 = m_code[3];
- } else {
- m_current = m_code < m_codeEnd ? m_code[0] : -1;
- m_next1 = m_code + 1 < m_codeEnd ? m_code[1] : -1;
- m_next2 = m_code + 2 < m_codeEnd ? m_code[2] : -1;
- m_next3 = -1;
- }
-
- m_code += 4;
-}
-
void Lexer::setCode(const SourceCode& source, ParserArena& arena)
{
m_arena = &arena.identifierArena();
m_buffer8.reserveInitialCapacity(initialReadBufferCapacity);
m_buffer16.reserveInitialCapacity((m_codeEnd - m_code) / 2);
- // ECMA-262 calls for stripping all Cf characters, but we only strip BOM characters.
- // See <https://bugs.webkit.org/show_bug.cgi?id=4931> for details.
- if (source.provider()->hasBOMs()) {
- for (const UChar* p = m_codeStart; p < m_codeEnd; ++p) {
- if (UNLIKELY(*p == byteOrderMark)) {
- copyCodeWithoutBOMs();
- break;
- }
- }
- }
-
- // Read the first characters into the 4-character buffer.
- shift4();
+ if (LIKELY(m_code < m_codeEnd))
+ m_current = *m_code;
+ else
+ m_current = -1;
ASSERT(currentOffset() == source.startOffset());
}
-void Lexer::copyCodeWithoutBOMs()
+template <int shiftAmount, Lexer::ShiftType shouldBoundsCheck> ALWAYS_INLINE void Lexer::internalShift()
{
- // Note: In this case, the character offset data for debugging will be incorrect.
- // If it's important to correctly debug code with extraneous BOMs, then the caller
- // should strip the BOMs when creating the SourceProvider object and do its own
- // mapping of offsets within the stripped text to original text offset.
-
- m_codeWithoutBOMs.reserveCapacity(m_codeEnd - m_code);
- for (const UChar* p = m_code; p < m_codeEnd; ++p) {
- UChar c = *p;
- if (c != byteOrderMark)
- m_codeWithoutBOMs.append(c);
+ if (shouldBoundsCheck == DoBoundsCheck) {
+ // Faster than an if-else sequence
+ ASSERT(m_current != -1);
+ m_current = -1;
+ m_code += shiftAmount;
+ if (LIKELY(m_code < m_codeEnd))
+ m_current = *m_code;
+ } else {
+ m_code += shiftAmount;
+ m_current = *m_code;
}
- ptrdiff_t startDelta = m_codeStart - m_code;
- m_code = m_codeWithoutBOMs.data();
- m_codeStart = m_code + startDelta;
- m_codeEnd = m_codeWithoutBOMs.data() + m_codeWithoutBOMs.size();
+}
+
+ALWAYS_INLINE void Lexer::shift()
+{
+ internalShift<1, DoBoundsCheck>();
+}
+
+ALWAYS_INLINE int Lexer::peek(int offset)
+{
+ // Only use if necessary
+ ASSERT(offset > 0 && offset < 5);
+ const UChar* code = m_code + offset;
+ return (code < m_codeEnd) ? *code : -1;
+}
+
+int Lexer::getUnicodeCharacter()
+{
+ int char1 = peek(1);
+ int char2 = peek(2);
+ int char3 = peek(3);
+
+ if (UNLIKELY(!isASCIIHexDigit(m_current) || !isASCIIHexDigit(char1) || !isASCIIHexDigit(char2) || !isASCIIHexDigit(char3)))
+ return -1;
+
+ int result = convertUnicode(m_current, char1, char2, char3);
+ shift();
+ shift();
+ shift();
+ shift();
+ return result;
}
void Lexer::shiftLineTerminator()
{
ASSERT(isLineTerminator(m_current));
+ int m_prev = m_current;
+ shift();
+
// Allow both CRLF and LFCR.
- if (m_current + m_next1 == '\n' + '\r')
- shift2();
- else
- shift1();
+ if (m_prev + m_current == '\n' + '\r')
+ shift();
++m_lineNumber;
}
-ALWAYS_INLINE const Identifier* Lexer::makeIdentifier(const UChar* characters, size_t length)
-{
- return &m_arena->makeIdentifier(m_globalData, characters, length);
-}
-
-inline bool Lexer::lastTokenWasRestrKeyword() const
+ALWAYS_INLINE bool Lexer::lastTokenWasRestrKeyword() const
{
return m_lastToken == CONTINUE || m_lastToken == BREAK || m_lastToken == RETURN || m_lastToken == THROW;
}
static inline bool isIdentStart(int c)
{
- return isASCII(c) ? isASCIIAlpha(c) || c == '$' || c == '_' : isNonASCIIIdentStart(c);
+ return isASCII(c) ? typesOfASCIICharacters[c] == CharacterIdentifierStart : isNonASCIIIdentStart(c);
}
static NEVER_INLINE bool isNonASCIIIdentPart(int c)
| Mark_NonSpacing | Mark_SpacingCombining | Number_DecimalDigit | Punctuation_Connector);
}
-static inline bool isIdentPart(int c)
+static ALWAYS_INLINE bool isIdentPart(int c)
{
- return isASCII(c) ? isASCIIAlphanumeric(c) || c == '$' || c == '_' : isNonASCIIIdentPart(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 CharacterNumber can be
+ // part of an identifier. (See the CharacterType definition for more details.)
+ return isASCII(c) ? typesOfASCIICharacters[c] <= CharacterNumber : isNonASCIIIdentPart(c);
}
static inline int singleEscape(int c)
{
switch (c) {
- case 'b':
- return 0x08;
- case 't':
- return 0x09;
- case 'n':
- return 0x0A;
- case 'v':
- return 0x0B;
- case 'f':
- return 0x0C;
- case 'r':
- return 0x0D;
- default:
- return c;
+ case 'b':
+ return 0x08;
+ case 't':
+ return 0x09;
+ case 'n':
+ return 0x0A;
+ case 'v':
+ return 0x0B;
+ case 'f':
+ return 0x0C;
+ case 'r':
+ return 0x0D;
+ case '\\':
+ return '\\';
+ case '\'':
+ return '\'';
+ case '"':
+ return '"';
+ default:
+ return 0;
}
}
record16(UChar(static_cast<unsigned short>(c)));
}
-int Lexer::lex(void* p1, void* p2)
+template <bool shouldCreateIdentifier> ALWAYS_INLINE JSTokenType Lexer::parseIdentifier(JSTokenData* tokenData, unsigned lexType)
+{
+ const ptrdiff_t remaining = m_codeEnd - m_code;
+ if ((remaining >= maxTokenLength) && !(lexType & IgnoreReservedWords)) {
+ JSTokenType keyword = parseKeyword<shouldCreateIdentifier>(tokenData);
+ if (keyword != IDENT) {
+ ASSERT((!shouldCreateIdentifier) || tokenData->ident);
+ return keyword;
+ }
+ }
+ const UChar* identifierStart = currentCharacter();
+ bool bufferRequired = false;
+
+ while (true) {
+ if (LIKELY(isIdentPart(m_current))) {
+ shift();
+ continue;
+ }
+ if (LIKELY(m_current != '\\'))
+ break;
+
+ // \uXXXX unicode characters.
+ bufferRequired = true;
+ if (identifierStart != currentCharacter())
+ m_buffer16.append(identifierStart, currentCharacter() - identifierStart);
+ shift();
+ if (UNLIKELY(m_current != 'u'))
+ return ERRORTOK;
+ shift();
+ int character = getUnicodeCharacter();
+ if (UNLIKELY(character == -1))
+ return ERRORTOK;
+ if (UNLIKELY(m_buffer16.size() ? !isIdentPart(character) : !isIdentStart(character)))
+ return ERRORTOK;
+ if (shouldCreateIdentifier)
+ record16(character);
+ identifierStart = currentCharacter();
+ }
+
+ int identifierLength;
+ const Identifier* ident = 0;
+ if (shouldCreateIdentifier) {
+ if (!bufferRequired)
+ identifierLength = currentCharacter() - identifierStart;
+ else {
+ if (identifierStart != currentCharacter())
+ m_buffer16.append(identifierStart, currentCharacter() - identifierStart);
+ identifierStart = m_buffer16.data();
+ identifierLength = m_buffer16.size();
+ }
+
+ ident = makeIdentifier(identifierStart, identifierLength);
+ tokenData->ident = ident;
+ } else
+ tokenData->ident = 0;
+
+ m_delimited = false;
+
+ if (LIKELY(!bufferRequired && !(lexType & IgnoreReservedWords))) {
+ ASSERT(shouldCreateIdentifier);
+ // Keywords must not be recognized if there was an \uXXXX in the identifier.
+ if (remaining < maxTokenLength) {
+ const HashEntry* entry = m_keywordTable.entry(m_globalData, *ident);
+ ASSERT((remaining < maxTokenLength) || !entry);
+ return entry ? static_cast<JSTokenType>(entry->lexerValue()) : IDENT;
+ }
+ return IDENT;
+ }
+
+ m_buffer16.resize(0);
+ return IDENT;
+}
+
+bool Lexer::isKeyword(const Identifier& ident)
+{
+ return m_keywordTable.entry(m_globalData, ident);
+}
+
+template <bool shouldBuildStrings> ALWAYS_INLINE bool Lexer::parseString(JSTokenData* tokenData, bool strictMode)
+{
+ int stringQuoteCharacter = m_current;
+ shift();
+
+ const UChar* stringStart = currentCharacter();
+
+ while (m_current != stringQuoteCharacter) {
+ if (UNLIKELY(m_current == '\\')) {
+ if (stringStart != currentCharacter() && shouldBuildStrings)
+ m_buffer16.append(stringStart, currentCharacter() - stringStart);
+ shift();
+
+ int escape = singleEscape(m_current);
+
+ // Most common escape sequences first
+ if (escape) {
+ if (shouldBuildStrings)
+ record16(escape);
+ shift();
+ } else if (UNLIKELY(isLineTerminator(m_current)))
+ shiftLineTerminator();
+ else if (m_current == 'x') {
+ shift();
+ if (isASCIIHexDigit(m_current) && isASCIIHexDigit(peek(1))) {
+ int prev = m_current;
+ shift();
+ if (shouldBuildStrings)
+ record16(convertHex(prev, m_current));
+ shift();
+ } else if (shouldBuildStrings)
+ record16('x');
+ } else if (m_current == 'u') {
+ shift();
+ int character = getUnicodeCharacter();
+ if (character != -1) {
+ if (shouldBuildStrings)
+ record16(character);
+ } else if (m_current == stringQuoteCharacter) {
+ if (shouldBuildStrings)
+ record16('u');
+ } else // Only stringQuoteCharacter allowed after \u
+ return false;
+ } else if (strictMode && isASCIIDigit(m_current)) {
+ // The only valid numeric escape in strict mode is '\0', and this must not be followed by a decimal digit.
+ int character1 = m_current;
+ shift();
+ if (character1 != '0' || isASCIIDigit(m_current))
+ return false;
+ if (shouldBuildStrings)
+ record16(0);
+ } else if (!strictMode && isASCIIOctalDigit(m_current)) {
+ // Octal character sequences
+ int character1 = m_current;
+ shift();
+ if (isASCIIOctalDigit(m_current)) {
+ // Two octal characters
+ int character2 = m_current;
+ shift();
+ if (character1 >= '0' && character1 <= '3' && isASCIIOctalDigit(m_current)) {
+ if (shouldBuildStrings)
+ record16((character1 - '0') * 64 + (character2 - '0') * 8 + m_current - '0');
+ shift();
+ } else {
+ if (shouldBuildStrings)
+ record16((character1 - '0') * 8 + character2 - '0');
+ }
+ } else {
+ if (shouldBuildStrings)
+ record16(character1 - '0');
+ }
+ } else if (m_current != -1) {
+ if (shouldBuildStrings)
+ record16(m_current);
+ shift();
+ } else
+ return false;
+
+ stringStart = currentCharacter();
+ continue;
+ }
+ // Fast check for characters that require special handling.
+ // Catches -1, \n, \r, 0x2028, and 0x2029 as efficiently
+ // as possible, and lets through all common ASCII characters.
+ if (UNLIKELY(((static_cast<unsigned>(m_current) - 0xE) & 0x2000))) {
+ // New-line or end of input is not allowed
+ if (UNLIKELY(isLineTerminator(m_current)) || UNLIKELY(m_current == -1))
+ return false;
+ // Anything else is just a normal character
+ }
+ shift();
+ }
+
+ if (currentCharacter() != stringStart && shouldBuildStrings)
+ m_buffer16.append(stringStart, currentCharacter() - stringStart);
+ if (shouldBuildStrings)
+ tokenData->ident = makeIdentifier(m_buffer16.data(), m_buffer16.size());
+ else
+ tokenData->ident = 0;
+
+ m_buffer16.resize(0);
+ return true;
+}
+
+ALWAYS_INLINE void Lexer::parseHex(double& returnValue)
+{
+ // Optimization: most hexadecimal values fit into 4 bytes.
+ uint32_t hexValue = 0;
+ int maximumDigits = 7;
+
+ // Shift out the 'x' prefix.
+ shift();
+
+ do {
+ hexValue = (hexValue << 4) + toASCIIHexValue(m_current);
+ shift();
+ --maximumDigits;
+ } while (isASCIIHexDigit(m_current) && maximumDigits >= 0);
+
+ if (maximumDigits >= 0) {
+ returnValue = hexValue;
+ return;
+ }
+
+ // No more place in the hexValue buffer.
+ // The values are shifted out and placed into the m_buffer8 vector.
+ for (int i = 0; i < 8; ++i) {
+ int digit = hexValue >> 28;
+ if (digit < 10)
+ record8(digit + '0');
+ else
+ record8(digit - 10 + 'a');
+ hexValue <<= 4;
+ }
+
+ while (isASCIIHexDigit(m_current)) {
+ record8(m_current);
+ shift();
+ }
+
+ returnValue = parseIntOverflow(m_buffer8.data(), m_buffer8.size(), 16);
+}
+
+ALWAYS_INLINE bool Lexer::parseOctal(double& returnValue)
+{
+ // Optimization: most octal values fit into 4 bytes.
+ uint32_t octalValue = 0;
+ int maximumDigits = 9;
+ // Temporary buffer for the digits. Makes easier
+ // to reconstruct the input characters when needed.
+ char digits[10];
+
+ do {
+ octalValue = octalValue * 8 + (m_current - '0');
+ digits[maximumDigits] = m_current;
+ shift();
+ --maximumDigits;
+ } while (isASCIIOctalDigit(m_current) && maximumDigits >= 0);
+
+ if (!isASCIIDigit(m_current) && maximumDigits >= 0) {
+ returnValue = octalValue;
+ return true;
+ }
+
+ for (int i = 9; i > maximumDigits; --i)
+ record8(digits[i]);
+
+ while (isASCIIOctalDigit(m_current)) {
+ record8(m_current);
+ shift();
+ }
+
+ if (isASCIIDigit(m_current))
+ return false;
+
+ returnValue = parseIntOverflow(m_buffer8.data(), m_buffer8.size(), 8);
+ return true;
+}
+
+ALWAYS_INLINE bool Lexer::parseDecimal(double& returnValue)
+{
+ // Optimization: most decimal values fit into 4 bytes.
+ uint32_t decimalValue = 0;
+
+ // Since parseOctal may be executed before parseDecimal,
+ // the m_buffer8 may hold ascii digits.
+ if (!m_buffer8.size()) {
+ int maximumDigits = 9;
+ // Temporary buffer for the digits. Makes easier
+ // to reconstruct the input characters when needed.
+ char digits[10];
+
+ do {
+ decimalValue = decimalValue * 10 + (m_current - '0');
+ digits[maximumDigits] = m_current;
+ shift();
+ --maximumDigits;
+ } while (isASCIIDigit(m_current) && maximumDigits >= 0);
+
+ if (maximumDigits >= 0 && m_current != '.' && (m_current | 0x20) != 'e') {
+ returnValue = decimalValue;
+ return true;
+ }
+
+ for (int i = 9; i > maximumDigits; --i)
+ record8(digits[i]);
+ }
+
+ while (isASCIIDigit(m_current)) {
+ record8(m_current);
+ shift();
+ }
+
+ return false;
+}
+
+ALWAYS_INLINE void Lexer::parseNumberAfterDecimalPoint()
+{
+ record8('.');
+ while (isASCIIDigit(m_current)) {
+ record8(m_current);
+ shift();
+ }
+}
+
+ALWAYS_INLINE bool Lexer::parseNumberAfterExponentIndicator()
+{
+ record8('e');
+ shift();
+ if (m_current == '+' || m_current == '-') {
+ record8(m_current);
+ shift();
+ }
+
+ if (!isASCIIDigit(m_current))
+ return false;
+
+ do {
+ record8(m_current);
+ shift();
+ } while (isASCIIDigit(m_current));
+ return true;
+}
+
+ALWAYS_INLINE bool Lexer::parseMultilineComment()
+{
+ while (true) {
+ while (UNLIKELY(m_current == '*')) {
+ shift();
+ if (m_current == '/') {
+ shift();
+ return true;
+ }
+ }
+
+ if (UNLIKELY(m_current == -1))
+ return false;
+
+ if (isLineTerminator(m_current))
+ shiftLineTerminator();
+ else
+ shift();
+ }
+}
+
+bool Lexer::nextTokenIsColon()
+{
+ const UChar* code = m_code;
+ while (code < m_codeEnd && (isWhiteSpace(*code) || isLineTerminator(*code)))
+ code++;
+
+ return code < m_codeEnd && *code == ':';
+}
+
+JSTokenType Lexer::lex(JSTokenData* tokenData, JSTokenInfo* tokenInfo, unsigned lexType, bool strictMode)
{
ASSERT(!m_error);
ASSERT(m_buffer8.isEmpty());
ASSERT(m_buffer16.isEmpty());
- YYSTYPE* lvalp = static_cast<YYSTYPE*>(p1);
- YYLTYPE* llocp = static_cast<YYLTYPE*>(p2);
- int token = 0;
+ JSTokenType token = ERRORTOK;
m_terminator = false;
start:
while (isWhiteSpace(m_current))
- shift1();
+ shift();
int startOffset = currentOffset();
- if (m_current == -1) {
- if (!m_terminator && !m_delimited && !m_isReparsing) {
- // automatic semicolon insertion if program incomplete
- token = ';';
- goto doneSemicolon;
- }
- return 0;
- }
+ if (UNLIKELY(m_current == -1))
+ return EOFTOK;
m_delimited = false;
- switch (m_current) {
- case '>':
- if (m_next1 == '>' && m_next2 == '>') {
- if (m_next3 == '=') {
- shift4();
+
+ CharacterType type;
+ if (LIKELY(isASCII(m_current)))
+ type = static_cast<CharacterType>(typesOfASCIICharacters[m_current]);
+ else if (isNonASCIIIdentStart(m_current))
+ type = CharacterIdentifierStart;
+ else if (isLineTerminator(m_current))
+ type = CharacterLineTerminator;
+ else
+ type = CharacterInvalid;
+
+ switch (type) {
+ case CharacterGreater:
+ shift();
+ if (m_current == '>') {
+ shift();
+ if (m_current == '>') {
+ shift();
+ if (m_current == '=') {
+ shift();
token = URSHIFTEQUAL;
break;
}
- shift3();
token = URSHIFT;
break;
}
- if (m_next1 == '>') {
- if (m_next2 == '=') {
- shift3();
- token = RSHIFTEQUAL;
- break;
- }
- shift2();
- token = RSHIFT;
- break;
- }
- if (m_next1 == '=') {
- shift2();
- token = GE;
+ if (m_current == '=') {
+ shift();
+ token = RSHIFTEQUAL;
break;
}
- shift1();
- token = '>';
+ token = RSHIFT;
break;
- case '=':
- if (m_next1 == '=') {
- if (m_next2 == '=') {
- shift3();
- token = STREQ;
- break;
- }
- shift2();
- token = EQEQ;
- break;
- }
- shift1();
- token = '=';
+ }
+ if (m_current == '=') {
+ shift();
+ token = GE;
break;
- case '!':
- if (m_next1 == '=') {
- if (m_next2 == '=') {
- shift3();
- token = STRNEQ;
- break;
- }
- shift2();
- token = NE;
+ }
+ token = GT;
+ break;
+ case CharacterEqual:
+ shift();
+ if (m_current == '=') {
+ shift();
+ if (m_current == '=') {
+ shift();
+ token = STREQ;
break;
}
- shift1();
- token = '!';
+ token = EQEQ;
break;
- case '<':
- if (m_next1 == '!' && m_next2 == '-' && m_next3 == '-') {
- // <!-- marks the beginning of a line comment (for www usage)
- shift4();
- goto inSingleLineComment;
- }
- if (m_next1 == '<') {
- if (m_next2 == '=') {
- shift3();
- token = LSHIFTEQUAL;
- break;
- }
- shift2();
- token = LSHIFT;
- break;
- }
- if (m_next1 == '=') {
- shift2();
- token = LE;
+ }
+ token = EQUAL;
+ break;
+ case CharacterLess:
+ shift();
+ if (m_current == '!' && peek(1) == '-' && peek(2) == '-') {
+ // <!-- marks the beginning of a line comment (for www usage)
+ goto inSingleLineComment;
+ }
+ if (m_current == '<') {
+ shift();
+ if (m_current == '=') {
+ shift();
+ token = LSHIFTEQUAL;
break;
}
- shift1();
- token = '<';
+ token = LSHIFT;
break;
- case '+':
- if (m_next1 == '+') {
- shift2();
- if (m_terminator) {
- token = AUTOPLUSPLUS;
- break;
- }
- token = PLUSPLUS;
- break;
- }
- if (m_next1 == '=') {
- shift2();
- token = PLUSEQUAL;
- break;
- }
- shift1();
- token = '+';
+ }
+ if (m_current == '=') {
+ shift();
+ token = LE;
break;
- case '-':
- if (m_next1 == '-') {
- if (m_atLineStart && m_next2 == '>') {
- shift3();
- goto inSingleLineComment;
- }
- shift2();
- if (m_terminator) {
- token = AUTOMINUSMINUS;
- break;
- }
- token = MINUSMINUS;
- break;
- }
- if (m_next1 == '=') {
- shift2();
- token = MINUSEQUAL;
+ }
+ token = LT;
+ break;
+ case CharacterExclamationMark:
+ shift();
+ if (m_current == '=') {
+ shift();
+ if (m_current == '=') {
+ shift();
+ token = STRNEQ;
break;
}
- shift1();
- token = '-';
+ token = NE;
break;
- case '*':
- if (m_next1 == '=') {
- shift2();
- token = MULTEQUAL;
- break;
- }
- shift1();
- token = '*';
+ }
+ token = EXCLAMATION;
+ break;
+ case CharacterAdd:
+ shift();
+ if (m_current == '+') {
+ shift();
+ token = (!m_terminator) ? PLUSPLUS : AUTOPLUSPLUS;
+ break;
+ }
+ if (m_current == '=') {
+ shift();
+ token = PLUSEQUAL;
break;
- case '/':
- if (m_next1 == '/') {
- shift2();
+ }
+ token = PLUS;
+ break;
+ case CharacterSub:
+ shift();
+ if (m_current == '-') {
+ shift();
+ if (m_atLineStart && m_current == '>') {
+ shift();
goto inSingleLineComment;
}
- if (m_next1 == '*')
- goto inMultiLineComment;
- if (m_next1 == '=') {
- shift2();
- token = DIVEQUAL;
- break;
- }
- shift1();
- token = '/';
+ token = (!m_terminator) ? MINUSMINUS : AUTOMINUSMINUS;
break;
- case '&':
- if (m_next1 == '&') {
- shift2();
- token = AND;
- break;
- }
- if (m_next1 == '=') {
- shift2();
- token = ANDEQUAL;
- break;
- }
- shift1();
- token = '&';
+ }
+ if (m_current == '=') {
+ shift();
+ token = MINUSEQUAL;
break;
- case '^':
- if (m_next1 == '=') {
- shift2();
- token = XOREQUAL;
- break;
- }
- shift1();
- token = '^';
+ }
+ token = MINUS;
+ break;
+ case CharacterMultiply:
+ shift();
+ if (m_current == '=') {
+ shift();
+ token = MULTEQUAL;
break;
- case '%':
- if (m_next1 == '=') {
- shift2();
- token = MODEQUAL;
- break;
- }
- shift1();
- token = '%';
+ }
+ token = TIMES;
+ break;
+ case CharacterSlash:
+ shift();
+ if (m_current == '/') {
+ shift();
+ goto inSingleLineComment;
+ }
+ if (m_current == '*') {
+ shift();
+ if (parseMultilineComment())
+ goto start;
+ goto returnError;
+ }
+ if (m_current == '=') {
+ shift();
+ token = DIVEQUAL;
break;
- case '|':
- if (m_next1 == '=') {
- shift2();
- token = OREQUAL;
- break;
- }
- if (m_next1 == '|') {
- shift2();
- token = OR;
- break;
- }
- shift1();
- token = '|';
+ }
+ token = DIVIDE;
+ break;
+ case CharacterAnd:
+ shift();
+ if (m_current == '&') {
+ shift();
+ token = AND;
break;
- case '.':
- if (isASCIIDigit(m_next1)) {
- record8('.');
- shift1();
- goto inNumberAfterDecimalPoint;
- }
- token = '.';
- shift1();
+ }
+ if (m_current == '=') {
+ shift();
+ token = ANDEQUAL;
break;
- case ',':
- case '~':
- case '?':
- case ':':
- case '(':
- case ')':
- case '[':
- case ']':
- token = m_current;
- shift1();
+ }
+ token = BITAND;
+ break;
+ case CharacterXor:
+ shift();
+ if (m_current == '=') {
+ shift();
+ token = XOREQUAL;
break;
- case ';':
- shift1();
- m_delimited = true;
- token = ';';
+ }
+ token = BITXOR;
+ break;
+ case CharacterModulo:
+ shift();
+ if (m_current == '=') {
+ shift();
+ token = MODEQUAL;
break;
- case '{':
- lvalp->intValue = currentOffset();
- shift1();
- token = OPENBRACE;
+ }
+ token = MOD;
+ break;
+ case CharacterOr:
+ shift();
+ if (m_current == '=') {
+ shift();
+ token = OREQUAL;
break;
- case '}':
- lvalp->intValue = currentOffset();
- shift1();
- m_delimited = true;
- token = CLOSEBRACE;
+ }
+ if (m_current == '|') {
+ shift();
+ token = OR;
break;
- case '\\':
- goto startIdentifierWithBackslash;
- case '0':
- goto startNumberWithZeroDigit;
- case '1':
- case '2':
- case '3':
- case '4':
- case '5':
- case '6':
- case '7':
- case '8':
- case '9':
- goto startNumber;
- case '"':
- case '\'':
- goto startString;
- default:
- if (isIdentStart(m_current))
- goto startIdentifierOrKeyword;
- if (isLineTerminator(m_current)) {
- shiftLineTerminator();
- m_atLineStart = true;
- m_terminator = true;
- if (lastTokenWasRestrKeyword()) {
- token = ';';
- goto doneSemicolon;
+ }
+ token = BITOR;
+ break;
+ case CharacterOpenParen:
+ token = OPENPAREN;
+ shift();
+ break;
+ case CharacterCloseParen:
+ token = CLOSEPAREN;
+ shift();
+ break;
+ case CharacterOpenBracket:
+ token = OPENBRACKET;
+ shift();
+ break;
+ case CharacterCloseBracket:
+ token = CLOSEBRACKET;
+ shift();
+ break;
+ case CharacterComma:
+ token = COMMA;
+ shift();
+ break;
+ case CharacterColon:
+ token = COLON;
+ shift();
+ break;
+ case CharacterQuestion:
+ token = QUESTION;
+ shift();
+ break;
+ case CharacterTilde:
+ token = TILDE;
+ shift();
+ break;
+ case CharacterSemicolon:
+ m_delimited = true;
+ shift();
+ token = SEMICOLON;
+ break;
+ case CharacterOpenBrace:
+ tokenData->intValue = currentOffset();
+ shift();
+ token = OPENBRACE;
+ break;
+ case CharacterCloseBrace:
+ tokenData->intValue = currentOffset();
+ m_delimited = true;
+ shift();
+ token = CLOSEBRACE;
+ break;
+ case CharacterDot:
+ shift();
+ if (!isASCIIDigit(m_current)) {
+ token = DOT;
+ break;
+ }
+ goto inNumberAfterDecimalPoint;
+ case CharacterZero:
+ shift();
+ if ((m_current | 0x20) == 'x' && isASCIIHexDigit(peek(1))) {
+ parseHex(tokenData->doubleValue);
+ token = NUMBER;
+ } else {
+ record8('0');
+ if (isASCIIOctalDigit(m_current)) {
+ if (parseOctal(tokenData->doubleValue)) {
+ if (strictMode)
+ goto returnError;
+ token = NUMBER;
}
- goto start;
}
- goto returnError;
- }
-
- m_atLineStart = false;
- goto returnToken;
-
-startString: {
- int stringQuoteCharacter = m_current;
- shift1();
-
- const UChar* stringStart = currentCharacter();
- while (m_current != stringQuoteCharacter) {
- // Fast check for characters that require special handling.
- // Catches -1, \n, \r, \, 0x2028, and 0x2029 as efficiently
- // as possible, and lets through all common ASCII characters.
- if (UNLIKELY(m_current == '\\') || UNLIKELY(((static_cast<unsigned>(m_current) - 0xE) & 0x2000))) {
- m_buffer16.append(stringStart, currentCharacter() - stringStart);
- goto inString;
}
- shift1();
- }
- lvalp->ident = makeIdentifier(stringStart, currentCharacter() - stringStart);
- shift1();
- m_atLineStart = false;
- m_delimited = false;
- token = STRING;
- goto returnToken;
+ // Fall through into CharacterNumber
+ case CharacterNumber:
+ if (LIKELY(token != NUMBER)) {
+ if (!parseDecimal(tokenData->doubleValue)) {
+ if (m_current == '.') {
+ shift();
+inNumberAfterDecimalPoint:
+ parseNumberAfterDecimalPoint();
+ }
+ if ((m_current | 0x20) == 'e')
+ if (!parseNumberAfterExponentIndicator())
+ goto returnError;
+ // Null-terminate string for strtod.
+ m_buffer8.append('\0');
+ tokenData->doubleValue = WTF::strtod(m_buffer8.data(), 0);
+ }
+ token = NUMBER;
+ }
-inString:
- while (m_current != stringQuoteCharacter) {
- if (m_current == '\\')
- goto inStringEscapeSequence;
- if (UNLIKELY(isLineTerminator(m_current)))
- goto returnError;
- if (UNLIKELY(m_current == -1))
+ // No identifiers allowed directly after numeric literal, e.g. "3in" is bad.
+ if (UNLIKELY(isIdentStart(m_current)))
goto returnError;
- record16(m_current);
- shift1();
- }
- goto doneString;
-
-inStringEscapeSequence:
- shift1();
- if (m_current == 'x') {
- shift1();
- if (isASCIIHexDigit(m_current) && isASCIIHexDigit(m_next1)) {
- record16(convertHex(m_current, m_next1));
- shift2();
- goto inString;
- }
- record16('x');
- if (m_current == stringQuoteCharacter)
- goto doneString;
- goto inString;
- }
- if (m_current == 'u') {
- shift1();
- if (isASCIIHexDigit(m_current) && isASCIIHexDigit(m_next1) && isASCIIHexDigit(m_next2) && isASCIIHexDigit(m_next3)) {
- record16(convertUnicode(m_current, m_next1, m_next2, m_next3));
- shift4();
- goto inString;
- }
- if (m_current == stringQuoteCharacter) {
- record16('u');
- goto doneString;
- }
- goto returnError;
- }
- if (isASCIIOctalDigit(m_current)) {
- if (m_current >= '0' && m_current <= '3' && isASCIIOctalDigit(m_next1) && isASCIIOctalDigit(m_next2)) {
- record16((m_current - '0') * 64 + (m_next1 - '0') * 8 + m_next2 - '0');
- shift3();
- goto inString;
- }
- if (isASCIIOctalDigit(m_next1)) {
- record16((m_current - '0') * 8 + m_next1 - '0');
- shift2();
- goto inString;
+ m_buffer8.resize(0);
+ m_delimited = false;
+ break;
+ case CharacterQuote:
+ if (lexType & DontBuildStrings) {
+ if (UNLIKELY(!parseString<false>(tokenData, strictMode)))
+ goto returnError;
+ } else {
+ if (UNLIKELY(!parseString<true>(tokenData, strictMode)))
+ goto returnError;
}
- record16(m_current - '0');
- shift1();
- goto inString;
- }
- if (isLineTerminator(m_current)) {
+ shift();
+ m_delimited = false;
+ token = STRING;
+ break;
+ case CharacterIdentifierStart:
+ ASSERT(isIdentStart(m_current));
+ // Fall through into CharacterBackSlash.
+ case CharacterBackSlash:
+ if (lexType & DontBuildKeywords)
+ token = parseIdentifier<false>(tokenData, lexType);
+ else
+ token = parseIdentifier<true>(tokenData, lexType);
+ break;
+ case CharacterLineTerminator:
+ ASSERT(isLineTerminator(m_current));
shiftLineTerminator();
- goto inString;
- }
- if (m_current == -1)
- goto returnError;
- record16(singleEscape(m_current));
- shift1();
- goto inString;
-}
-
-startIdentifierWithBackslash:
- shift1();
- if (UNLIKELY(m_current != 'u'))
- goto returnError;
- shift1();
- if (UNLIKELY(!isASCIIHexDigit(m_current) || !isASCIIHexDigit(m_next1) || !isASCIIHexDigit(m_next2) || !isASCIIHexDigit(m_next3)))
+ m_atLineStart = true;
+ m_terminator = true;
+ goto start;
+ case CharacterInvalid:
goto returnError;
- token = convertUnicode(m_current, m_next1, m_next2, m_next3);
- if (UNLIKELY(!isIdentStart(token)))
+ default:
+ ASSERT_NOT_REACHED();
goto returnError;
- goto inIdentifierAfterCharacterCheck;
-
-startIdentifierOrKeyword: {
- const UChar* identifierStart = currentCharacter();
- shift1();
- while (isIdentPart(m_current))
- shift1();
- if (LIKELY(m_current != '\\')) {
- lvalp->ident = makeIdentifier(identifierStart, currentCharacter() - identifierStart);
- goto doneIdentifierOrKeyword;
}
- m_buffer16.append(identifierStart, currentCharacter() - identifierStart);
-}
- do {
- shift1();
- if (UNLIKELY(m_current != 'u'))
- goto returnError;
- shift1();
- if (UNLIKELY(!isASCIIHexDigit(m_current) || !isASCIIHexDigit(m_next1) || !isASCIIHexDigit(m_next2) || !isASCIIHexDigit(m_next3)))
- goto returnError;
- token = convertUnicode(m_current, m_next1, m_next2, m_next3);
- if (UNLIKELY(!isIdentPart(token)))
- goto returnError;
-inIdentifierAfterCharacterCheck:
- record16(token);
- shift4();
-
- while (isIdentPart(m_current)) {
- record16(m_current);
- shift1();
- }
- } while (UNLIKELY(m_current == '\\'));
- goto doneIdentifier;
+ m_atLineStart = false;
+ goto returnToken;
inSingleLineComment:
while (!isLineTerminator(m_current)) {
if (UNLIKELY(m_current == -1))
- return 0;
- shift1();
+ return EOFTOK;
+ shift();
}
shiftLineTerminator();
m_atLineStart = true;
m_terminator = true;
- if (lastTokenWasRestrKeyword())
- goto doneSemicolon;
- goto start;
-
-inMultiLineComment:
- shift2();
- while (m_current != '*' || m_next1 != '/') {
- if (isLineTerminator(m_current))
- shiftLineTerminator();
- else {
- shift1();
- if (UNLIKELY(m_current == -1))
- goto returnError;
- }
- }
- shift2();
- m_atLineStart = false;
- goto start;
-
-startNumberWithZeroDigit:
- shift1();
- if ((m_current | 0x20) == 'x' && isASCIIHexDigit(m_next1)) {
- shift1();
- goto inHex;
- }
- if (m_current == '.') {
- record8('0');
- record8('.');
- shift1();
- goto inNumberAfterDecimalPoint;
- }
- if ((m_current | 0x20) == 'e') {
- record8('0');
- record8('e');
- shift1();
- goto inExponentIndicator;
- }
- if (isASCIIOctalDigit(m_current))
- goto inOctal;
- if (isASCIIDigit(m_current))
- goto startNumber;
- lvalp->doubleValue = 0;
- goto doneNumeric;
-
-inNumberAfterDecimalPoint:
- while (isASCIIDigit(m_current)) {
- record8(m_current);
- shift1();
- }
- if ((m_current | 0x20) == 'e') {
- record8('e');
- shift1();
- goto inExponentIndicator;
- }
- goto doneNumber;
-
-inExponentIndicator:
- if (m_current == '+' || m_current == '-') {
- record8(m_current);
- shift1();
- }
- if (!isASCIIDigit(m_current))
- goto returnError;
- do {
- record8(m_current);
- shift1();
- } while (isASCIIDigit(m_current));
- goto doneNumber;
+ if (!lastTokenWasRestrKeyword())
+ goto start;
-inOctal: {
- do {
- record8(m_current);
- shift1();
- } while (isASCIIOctalDigit(m_current));
- if (isASCIIDigit(m_current))
- goto startNumber;
-
- double dval = 0;
-
- const char* end = m_buffer8.end();
- for (const char* p = m_buffer8.data(); p < end; ++p) {
- dval *= 8;
- dval += *p - '0';
- }
- if (dval >= mantissaOverflowLowerBound)
- dval = parseIntOverflow(m_buffer8.data(), end - m_buffer8.data(), 8);
-
- m_buffer8.resize(0);
-
- lvalp->doubleValue = dval;
- goto doneNumeric;
-}
-
-inHex: {
- do {
- record8(m_current);
- shift1();
- } while (isASCIIHexDigit(m_current));
-
- double dval = 0;
-
- const char* end = m_buffer8.end();
- for (const char* p = m_buffer8.data(); p < end; ++p) {
- dval *= 16;
- dval += toASCIIHexValue(*p);
- }
- if (dval >= mantissaOverflowLowerBound)
- dval = parseIntOverflow(m_buffer8.data(), end - m_buffer8.data(), 16);
-
- m_buffer8.resize(0);
-
- lvalp->doubleValue = dval;
- goto doneNumeric;
-}
-
-startNumber:
- record8(m_current);
- shift1();
- while (isASCIIDigit(m_current)) {
- record8(m_current);
- shift1();
- }
- if (m_current == '.') {
- record8('.');
- shift1();
- goto inNumberAfterDecimalPoint;
- }
- if ((m_current | 0x20) == 'e') {
- record8('e');
- shift1();
- goto inExponentIndicator;
- }
-
- // Fall through into doneNumber.
-
-doneNumber:
- // Null-terminate string for strtod.
- m_buffer8.append('\0');
- lvalp->doubleValue = WTF::strtod(m_buffer8.data(), 0);
- m_buffer8.resize(0);
-
- // Fall through into doneNumeric.
-
-doneNumeric:
- // No identifiers allowed directly after numeric literal, e.g. "3in" is bad.
- if (UNLIKELY(isIdentStart(m_current)))
- goto returnError;
-
- m_atLineStart = false;
- m_delimited = false;
- token = NUMBER;
- goto returnToken;
-
-doneSemicolon:
- token = ';';
+ token = SEMICOLON;
m_delimited = true;
- goto returnToken;
-
-doneIdentifier:
- m_atLineStart = false;
- m_delimited = false;
- lvalp->ident = makeIdentifier(m_buffer16.data(), m_buffer16.size());
- m_buffer16.resize(0);
- token = IDENT;
- goto returnToken;
-
-doneIdentifierOrKeyword: {
- m_atLineStart = false;
- m_delimited = false;
- m_buffer16.resize(0);
- const HashEntry* entry = m_keywordTable.entry(m_globalData, *lvalp->ident);
- token = entry ? entry->lexerValue() : IDENT;
- goto returnToken;
-}
-
-doneString:
- // Atomize constant strings in case they're later used in property lookup.
- shift1();
- m_atLineStart = false;
- m_delimited = false;
- lvalp->ident = makeIdentifier(m_buffer16.data(), m_buffer16.size());
- m_buffer16.resize(0);
- token = STRING;
-
// Fall through into returnToken.
-returnToken: {
- int lineNumber = m_lineNumber;
- llocp->first_line = lineNumber;
- llocp->last_line = lineNumber;
- llocp->first_column = startOffset;
- llocp->last_column = currentOffset();
-
+returnToken:
+ tokenInfo->line = m_lineNumber;
+ tokenInfo->startOffset = startOffset;
+ tokenInfo->endOffset = currentOffset();
m_lastToken = token;
return token;
-}
returnError:
m_error = true;
- return -1;
+ return ERRORTOK;
}
bool Lexer::scanRegExp(const Identifier*& pattern, const Identifier*& flags, UChar patternPrefix)
return false;
}
- shift1();
+ shift();
if (current == '/' && !lastWasEscape && !inBrackets)
break;
while (isIdentPart(m_current)) {
record16(m_current);
- shift1();
+ shift();
}
flags = makeIdentifier(m_buffer16.data(), m_buffer16.size());
if (isLineTerminator(current) || current == -1)
return false;
- shift1();
+ shift();
if (current == '/' && !lastWasEscape && !inBrackets)
break;
}
while (isIdentPart(m_current))
- shift1();
+ shift();
return true;
}
void Lexer::clear()
{
m_arena = 0;
- m_codeWithoutBOMs.clear();
Vector<char> newBuffer8;
m_buffer8.swap(newBuffer8);
SourceCode Lexer::sourceCode(int openBrace, int closeBrace, int firstLine)
{
- if (m_codeWithoutBOMs.isEmpty())
- return SourceCode(m_source->provider(), openBrace, closeBrace + 1, firstLine);
-
- const UChar* data = m_source->provider()->data();
-
- ASSERT(openBrace < closeBrace);
- int i;
- for (i = m_source->startOffset(); i < openBrace; ++i) {
- if (data[i] == byteOrderMark) {
- openBrace++;
- closeBrace++;
- }
- }
- for (; i < closeBrace; ++i) {
- if (data[i] == byteOrderMark)
- closeBrace++;
- }
-
- ASSERT(openBrace < closeBrace);
-
+ ASSERT(m_source->provider()->data()[openBrace] == '{');
+ ASSERT(m_source->provider()->data()[closeBrace] == '}');
return SourceCode(m_source->provider(), openBrace, closeBrace + 1, firstLine);
}
projects / apple / javascriptcore.git / blobdiff