JavaScriptCore-1218.tar.gz

[apple/javascriptcore.git] / runtime / JSGlobalObjectFunctions.cpp

diff --git a/runtime/JSGlobalObjectFunctions.cpp b/runtime/JSGlobalObjectFunctions.cpp
index be160a823c391f400ca1cc01f88f41a773f25bb6..0efaf84bc5ab0e4e8fc88c3a7a1630b3534cb425 100644 (file)
--- a/runtime/JSGlobalObjectFunctions.cpp
+++ b/runtime/JSGlobalObjectFunctions.cpp
@@ -1,7 +1,7 @@
 /*
  *  Copyright (C) 1999-2002 Harri Porten (porten@kde.org)
  *  Copyright (C) 2001 Peter Kelly (pmk@post.com)
 /*
  *  Copyright (C) 1999-2002 Harri Porten (porten@kde.org)
  *  Copyright (C) 2001 Peter Kelly (pmk@post.com)

- *  Copyright (C) 2003, 2004, 2005, 2006, 2007, 2008, 2009 Apple Inc. All rights reserved.
+ *  Copyright (C) 2003, 2004, 2005, 2006, 2007, 2008, 2009, 2012 Apple Inc. All rights reserved.

  *  Copyright (C) 2007 Cameron Zwarich (cwzwarich@uwaterloo.ca)
  *  Copyright (C) 2007 Maks Orlovich
  *
  *  Copyright (C) 2007 Cameron Zwarich (cwzwarich@uwaterloo.ca)
  *  Copyright (C) 2007 Maks Orlovich
  *


@@ -26,21 +26,24 @@
 #include "JSGlobalObjectFunctions.h"
 
 #include "CallFrame.h"
 #include "JSGlobalObjectFunctions.h"
 
 #include "CallFrame.h"

-#include "GlobalEvalFunction.h"
+#include "Interpreter.h"
+#include "JSFunction.h"

 #include "JSGlobalObject.h"
 #include "JSGlobalObject.h"

-#include "LiteralParser.h"

 #include "JSString.h"
 #include "JSString.h"

-#include "Interpreter.h"
-#include "Parser.h"
-#include "dtoa.h"
+#include "JSStringBuilder.h"

 #include "Lexer.h"
 #include "Lexer.h"

+#include "LiteralParser.h"

 #include "Nodes.h"
 #include "Nodes.h"

+#include "Operations.h"
+#include "Parser.h"
+#include <wtf/dtoa.h>

 #include <stdio.h>
 #include <stdlib.h>
 #include <stdio.h>
 #include <stdlib.h>

-#include <string.h>

 #include <wtf/ASCIICType.h>
 #include <wtf/Assertions.h>
 #include <wtf/MathExtras.h>
 #include <wtf/ASCIICType.h>
 #include <wtf/Assertions.h>
 #include <wtf/MathExtras.h>

+#include <wtf/StringExtras.h>
+#include <wtf/text/StringBuilder.h>

 #include <wtf/unicode/UTF8.h>
 
 using namespace WTF;
 #include <wtf/unicode/UTF8.h>
 
 using namespace WTF;


@@ -48,52 +51,50 @@ using namespace Unicode;
 
 namespace JSC {
 
 
 namespace JSC {
 

-static JSValue encode(ExecState* exec, const ArgList& args, const char* doNotEscape)
+static JSValue encode(ExecState* exec, const char* doNotEscape)

 {
 {

-    UString str = args.at(0).toString(exec);
-    CString cstr = str.UTF8String(true);
-    if (!cstr.c_str())
-        return throwError(exec, URIError, "String contained an illegal UTF-16 sequence.");
-
-    UString result = "";
-    const char* p = cstr.c_str();
-    for (size_t k = 0; k < cstr.size(); k++, p++) {
+    CString cstr = exec->argument(0).toString(exec)->value(exec).utf8(String::StrictConversion);
+    if (!cstr.data())
+        return throwError(exec, createURIError(exec, ASCIILiteral("String contained an illegal UTF-16 sequence.")));
+
+    JSStringBuilder builder;
+    const char* p = cstr.data();
+    for (size_t k = 0; k < cstr.length(); k++, p++) {

         char c = *p;
         if (c && strchr(doNotEscape, c))
         char c = *p;
         if (c && strchr(doNotEscape, c))

-            result.append(c);
+            builder.append(c);

         else {
             char tmp[4];
             snprintf(tmp, sizeof(tmp), "%%%02X", static_cast<unsigned char>(c));
         else {
             char tmp[4];
             snprintf(tmp, sizeof(tmp), "%%%02X", static_cast<unsigned char>(c));

-            result += tmp;
+            builder.append(tmp);

         }
     }
         }
     }

-    return jsString(exec, result);
+    return builder.build(exec);

 }
 
 }
 

-static JSValue decode(ExecState* exec, const ArgList& args, const char* doNotUnescape, bool strict)
+template <typename CharType>
+ALWAYS_INLINE
+static JSValue decode(ExecState* exec, const CharType* characters, int length, const char* doNotUnescape, bool strict)

 {
 {

-    UString result = "";
-    UString str = args.at(0).toString(exec);
+    JSStringBuilder builder;

     int k = 0;
     int k = 0;

-    int len = str.size();
-    const UChar* d = str.data();

     UChar u = 0;
     UChar u = 0;

-    while (k < len) {
-        const UChar* p = d + k;
-        UChar c = *p;
+    while (k < length) {
+        const CharType* p = characters + k;
+        CharType c = *p;

         if (c == '%') {
             int charLen = 0;
         if (c == '%') {
             int charLen = 0;

-            if (k <= len - 3 && isASCIIHexDigit(p[1]) && isASCIIHexDigit(p[2])) {
-                const char b0 = Lexer::convertHex(p[1], p[2]);
+            if (k <= length - 3 && isASCIIHexDigit(p[1]) && isASCIIHexDigit(p[2])) {
+                const char b0 = Lexer<CharType>::convertHex(p[1], p[2]);

                 const int sequenceLen = UTF8SequenceLength(b0);
                 const int sequenceLen = UTF8SequenceLength(b0);

-                if (sequenceLen != 0 && k <= len - sequenceLen * 3) {
+                if (sequenceLen && k <= length - sequenceLen * 3) {

                     charLen = sequenceLen * 3;
                     char sequence[5];
                     sequence[0] = b0;
                     for (int i = 1; i < sequenceLen; ++i) {
                     charLen = sequenceLen * 3;
                     char sequence[5];
                     sequence[0] = b0;
                     for (int i = 1; i < sequenceLen; ++i) {

-                        const UChar* q = p + i * 3;
+                        const CharType* q = p + i * 3;

                         if (q[0] == '%' && isASCIIHexDigit(q[1]) && isASCIIHexDigit(q[2]))
                         if (q[0] == '%' && isASCIIHexDigit(q[1]) && isASCIIHexDigit(q[2]))

-                            sequence[i] = Lexer::convertHex(q[1], q[2]);
+                            sequence[i] = Lexer<CharType>::convertHex(q[1], q[2]);

                         else {
                             charLen = 0;
                             break;
                         else {
                             charLen = 0;
                             break;


@@ -106,7 +107,7 @@ static JSValue decode(ExecState* exec, const ArgList& args, const char* doNotUne
                             charLen = 0;
                         else if (character >= 0x10000) {
                             // Convert to surrogate pair.
                             charLen = 0;
                         else if (character >= 0x10000) {
                             // Convert to surrogate pair.

-                            result.append(static_cast<UChar>(0xD800 | ((character - 0x10000) >> 10)));
+                            builder.append(static_cast<UChar>(0xD800 | ((character - 0x10000) >> 10)));

                             u = static_cast<UChar>(0xDC00 | ((character - 0x10000) & 0x3FF));
                         } else
                             u = static_cast<UChar>(character);
                             u = static_cast<UChar>(0xDC00 | ((character - 0x10000) & 0x3FF));
                         } else
                             u = static_cast<UChar>(character);


@@ -115,30 +116,45 @@ static JSValue decode(ExecState* exec, const ArgList& args, const char* doNotUne
             }
             if (charLen == 0) {
                 if (strict)
             }
             if (charLen == 0) {
                 if (strict)

-                    return throwError(exec, URIError);
+                    return throwError(exec, createURIError(exec, ASCIILiteral("URI error")));

                 // The only case where we don't use "strict" mode is the "unescape" function.
                 // For that, it's good to support the wonky "%u" syntax for compatibility with WinIE.
                 // The only case where we don't use "strict" mode is the "unescape" function.
                 // For that, it's good to support the wonky "%u" syntax for compatibility with WinIE.

-                if (k <= len - 6 && p[1] == 'u'
+                if (k <= length - 6 && p[1] == 'u'

                         && isASCIIHexDigit(p[2]) && isASCIIHexDigit(p[3])
                         && isASCIIHexDigit(p[4]) && isASCIIHexDigit(p[5])) {
                     charLen = 6;
                         && isASCIIHexDigit(p[2]) && isASCIIHexDigit(p[3])
                         && isASCIIHexDigit(p[4]) && isASCIIHexDigit(p[5])) {
                     charLen = 6;

-                    u = Lexer::convertUnicode(p[2], p[3], p[4], p[5]);
+                    u = Lexer<UChar>::convertUnicode(p[2], p[3], p[4], p[5]);

                 }
             }
             if (charLen && (u == 0 || u >= 128 || !strchr(doNotUnescape, u))) {
                 }
             }
             if (charLen && (u == 0 || u >= 128 || !strchr(doNotUnescape, u))) {

-                c = u;
-                k += charLen - 1;
+                if (u < 256)
+                    builder.append(static_cast<LChar>(u));
+                else
+                    builder.append(u);
+                k += charLen;
+                continue;

             }
         }
         k++;
             }
         }
         k++;

-        result.append(c);
+        builder.append(c);

     }
     }

-    return jsString(exec, result);
+    return builder.build(exec);
+}
+
+static JSValue decode(ExecState* exec, const char* doNotUnescape, bool strict)
+{
+    JSStringBuilder builder;
+    String str = exec->argument(0).toString(exec)->value(exec);
+    
+    if (str.is8Bit())
+        return decode(exec, str.characters8(), str.length(), doNotUnescape, strict);
+    return decode(exec, str.characters16(), str.length(), doNotUnescape, strict);

 }
 
 bool isStrWhiteSpace(UChar c)
 {
     switch (c) {
 }
 
 bool isStrWhiteSpace(UChar c)
 {
     switch (c) {

+        // ECMA-262-5th 7.2 & 7.3

         case 0x0009:
         case 0x000A:
         case 0x000B:
         case 0x0009:
         case 0x000A:
         case 0x000B:


@@ -148,6 +164,7 @@ bool isStrWhiteSpace(UChar c)
         case 0x00A0:
         case 0x2028:
         case 0x2029:
         case 0x00A0:
         case 0x2028:
         case 0x2029:

+        case 0xFEFF:

             return true;
         default:
             return c > 0xff && isSeparatorSpace(c);
             return true;
         default:
             return c > 0xff && isSeparatorSpace(c);


@@ -170,15 +187,15 @@ static int parseDigit(unsigned short c, int radix)
     return digit;
 }
 
     return digit;
 }
 

-double parseIntOverflow(const char* s, int length, int radix)
+double parseIntOverflow(const LChar* s, int length, int radix)

 {
     double number = 0.0;
     double radixMultiplier = 1.0;
 
 {
     double number = 0.0;
     double radixMultiplier = 1.0;
 

-    for (const char* p = s + length - 1; p >= s; p--) {
-        if (radixMultiplier == Inf) {
+    for (const LChar* p = s + length - 1; p >= s; p--) {
+        if (radixMultiplier == std::numeric_limits<double>::infinity()) {

             if (*p != '0') {
             if (*p != '0') {

-                number = Inf;
+                number = std::numeric_limits<double>::infinity();

                 break;
             }
         } else {
                 break;
             }
         } else {


@@ -192,15 +209,45 @@ double parseIntOverflow(const char* s, int length, int radix)
     return number;
 }
 
     return number;
 }
 

-static double parseInt(const UString& s, int radix)
+double parseIntOverflow(const UChar* s, int length, int radix)

 {
 {

-    int length = s.size();
-    const UChar* data = s.data();
-    int p = 0;
+    double number = 0.0;
+    double radixMultiplier = 1.0;

 
 

+    for (const UChar* p = s + length - 1; p >= s; p--) {
+        if (radixMultiplier == std::numeric_limits<double>::infinity()) {
+            if (*p != '0') {
+                number = std::numeric_limits<double>::infinity();
+                break;
+            }
+        } else {
+            int digit = parseDigit(*p, radix);
+            number += digit * radixMultiplier;
+        }
+
+        radixMultiplier *= radix;
+    }
+
+    return number;
+}
+
+// ES5.1 15.1.2.2
+template <typename CharType>
+ALWAYS_INLINE
+static double parseInt(const String& s, const CharType* data, int radix)
+{
+    // 1. Let inputString be ToString(string).
+    // 2. Let S be a newly created substring of inputString consisting of the first character that is not a
+    //    StrWhiteSpaceChar and all characters following that character. (In other words, remove leading white
+    //    space.) If inputString does not contain any such characters, let S be the empty string.
+    int length = s.length();
+    int p = 0;

     while (p < length && isStrWhiteSpace(data[p]))
         ++p;
 
     while (p < length && isStrWhiteSpace(data[p]))
         ++p;
 

+    // 3. Let sign be 1.
+    // 4. If S is not empty and the first character of S is a minus sign -, let sign be -1.
+    // 5. If S is not empty and the first character of S is a plus sign + or a minus sign -, then remove the first character from S.

     double sign = 1;
     if (p < length) {
         if (data[p] == '+')
     double sign = 1;
     if (p < length) {
         if (data[p] == '+')


@@ -211,19 +258,33 @@ static double parseInt(const UString& s, int radix)
         }
     }
 
         }
     }
 

+    // 6. Let R = ToInt32(radix).
+    // 7. Let stripPrefix be true.
+    // 8. If R != 0,then
+    //   b. If R != 16, let stripPrefix be false.
+    // 9. Else, R == 0
+    //   a. LetR = 10.
+    // 10. If stripPrefix is true, then
+    //   a. If the length of S is at least 2 and the first two characters of S are either ―0x or ―0X,
+    //      then remove the first two characters from S and let R = 16.
+    // 11. If S contains any character that is not a radix-R digit, then let Z be the substring of S
+    //     consisting of all characters before the first such character; otherwise, let Z be S.

     if ((radix == 0 || radix == 16) && length - p >= 2 && data[p] == '0' && (data[p + 1] == 'x' || data[p + 1] == 'X')) {
         radix = 16;
         p += 2;
     if ((radix == 0 || radix == 16) && length - p >= 2 && data[p] == '0' && (data[p + 1] == 'x' || data[p + 1] == 'X')) {
         radix = 16;
         p += 2;

-    } else if (radix == 0) {
-        if (p < length && data[p] == '0')
-            radix = 8;
-        else
-            radix = 10;
-    }
+    } else if (radix == 0)
+        radix = 10;

 
 

+    // 8.a If R < 2 or R > 36, then return NaN.

     if (radix < 2 || radix > 36)
     if (radix < 2 || radix > 36)

-        return NaN;
-
+        return QNaN;
+
+    // 13. Let mathInt be the mathematical integer value that is represented by Z in radix-R notation, using the letters
+    //     A-Z and a-z for digits with values 10 through 35. (However, if R is 10 and Z contains more than 20 significant
+    //     digits, every significant digit after the 20th may be replaced by a 0 digit, at the option of the implementation;
+    //     and if R is not 2, 4, 8, 10, 16, or 32, then mathInt may be an implementation-dependent approximation to the
+    //     mathematical integer value that is represented by Z in radix-R notation.)
+    // 14. Let number be the Number value for mathInt.

     int firstDigitPosition = p;
     bool sawDigit = false;
     double number = 0;
     int firstDigitPosition = p;
     bool sawDigit = false;
     double number = 0;


@@ -237,120 +298,291 @@ static double parseInt(const UString& s, int radix)
         ++p;
     }
 
         ++p;
     }
 

+    // 12. If Z is empty, return NaN.
+    if (!sawDigit)
+        return QNaN;
+
+    // Alternate code path for certain large numbers.

     if (number >= mantissaOverflowLowerBound) {
     if (number >= mantissaOverflowLowerBound) {

-        if (radix == 10)
-            number = WTF::strtod(s.substr(firstDigitPosition, p - firstDigitPosition).ascii(), 0);
-        else if (radix == 2 || radix == 4 || radix == 8 || radix == 16 || radix == 32)
-            number = parseIntOverflow(s.substr(firstDigitPosition, p - firstDigitPosition).ascii(), p - firstDigitPosition, radix);
+        if (radix == 10) {
+            size_t parsedLength;
+            number = parseDouble(s.characters() + firstDigitPosition, p - firstDigitPosition, parsedLength);
+        } else if (radix == 2 || radix == 4 || radix == 8 || radix == 16 || radix == 32)
+            number = parseIntOverflow(s.substringSharingImpl(firstDigitPosition, p - firstDigitPosition).utf8().data(), p - firstDigitPosition, radix);

     }
 
     }
 

-    if (!sawDigit)
-        return NaN;
-
+    // 15. Return sign x number.

     return sign * number;
 }
 
     return sign * number;
 }
 

-static double parseFloat(const UString& s)
+static double parseInt(const String& s, int radix)

 {
 {

-    // Check for 0x prefix here, because toDouble allows it, but we must treat it as 0.
-    // Need to skip any whitespace and then one + or - sign.
-    int length = s.size();
-    const UChar* data = s.data();
-    int p = 0;
-    while (p < length && isStrWhiteSpace(data[p]))
-        ++p;
+    if (s.is8Bit())
+        return parseInt(s, s.characters8(), radix);
+    return parseInt(s, s.characters16(), radix);
+}

 
 

-    if (p < length && (data[p] == '+' || data[p] == '-'))
-        ++p;
+static const int SizeOfInfinity = 8;

 
 

-    if (length - p >= 2 && data[p] == '0' && (data[p + 1] == 'x' || data[p + 1] == 'X'))
-        return 0;
+template <typename CharType>
+static bool isInfinity(const CharType* data, const CharType* end)
+{
+    return (end - data) >= SizeOfInfinity
+        && data[0] == 'I'
+        && data[1] == 'n'
+        && data[2] == 'f'
+        && data[3] == 'i'
+        && data[4] == 'n'
+        && data[5] == 'i'
+        && data[6] == 't'
+        && data[7] == 'y';
+}

 
 

-    return s.toDouble(true /*tolerant*/, false /* NaN for empty string */);
+// See ecma-262 9.3.1
+template <typename CharType>
+static double jsHexIntegerLiteral(const CharType*& data, const CharType* end)
+{
+    // Hex number.
+    data += 2;
+    const CharType* firstDigitPosition = data;
+    double number = 0;
+    while (true) {
+        number = number * 16 + toASCIIHexValue(*data);
+        ++data;
+        if (data == end)
+            break;
+        if (!isASCIIHexDigit(*data))
+            break;
+    }
+    if (number >= mantissaOverflowLowerBound)
+        number = parseIntOverflow(firstDigitPosition, data - firstDigitPosition, 16);
+
+    return number;

 }
 
 }
 

-JSValue JSC_HOST_CALL globalFuncEval(ExecState* exec, JSObject* function, JSValue thisValue, const ArgList& args)
+// See ecma-262 9.3.1
+template <typename CharType>
+static double jsStrDecimalLiteral(const CharType*& data, const CharType* end)

 {
 {

-    JSObject* thisObject = thisValue.toThisObject(exec);
-    JSObject* unwrappedObject = thisObject->unwrappedObject();
-    if (!unwrappedObject->isGlobalObject() || static_cast<JSGlobalObject*>(unwrappedObject)->evalFunction() != function)
-        return throwError(exec, EvalError, "The \"this\" value passed to eval must be the global object from which eval originated");
+    RELEASE_ASSERT(data < end);

 
 

-    JSValue x = args.at(0);
-    if (!x.isString())
-        return x;
+    size_t parsedLength;
+    double number = parseDouble(data, end - data, parsedLength);
+    if (parsedLength) {
+        data += parsedLength;
+        return number;
+    }

 
 

-    UString s = x.toString(exec);
+    // Check for [+-]?Infinity
+    switch (*data) {
+    case 'I':
+        if (isInfinity(data, end)) {
+            data += SizeOfInfinity;
+            return std::numeric_limits<double>::infinity();
+        }
+        break;

 
 

-    LiteralParser preparser(exec, s, LiteralParser::NonStrictJSON);
-    if (JSValue parsedObject = preparser.tryLiteralParse())
-        return parsedObject;
+    case '+':
+        if (isInfinity(data + 1, end)) {
+            data += SizeOfInfinity + 1;
+            return std::numeric_limits<double>::infinity();
+        }
+        break;

 
 

-    int errLine;
-    UString errMsg;
+    case '-':
+        if (isInfinity(data + 1, end)) {
+            data += SizeOfInfinity + 1;
+            return -std::numeric_limits<double>::infinity();
+        }
+        break;
+    }

 
 

-    SourceCode source = makeSource(s);
-    RefPtr<EvalNode> evalNode = exec->globalData().parser->parse<EvalNode>(exec, exec->dynamicGlobalObject()->debugger(), source, &errLine, &errMsg);
+    // Not a number.
+    return QNaN;
+}

 
 

-    if (!evalNode)
-        return throwError(exec, SyntaxError, errMsg, errLine, source.provider()->asID(), NULL);
+template <typename CharType>
+static double toDouble(const CharType* characters, unsigned size)
+{
+    const CharType* endCharacters = characters + size;

 
 

-    return exec->interpreter()->execute(evalNode.get(), exec, thisObject, static_cast<JSGlobalObject*>(unwrappedObject)->globalScopeChain().node(), exec->exceptionSlot());
+    // Skip leading white space.
+    for (; characters < endCharacters; ++characters) {
+        if (!isStrWhiteSpace(*characters))
+            break;
+    }
+    
+    // Empty string.
+    if (characters == endCharacters)
+        return 0.0;
+    
+    double number;
+    if (characters[0] == '0' && characters + 2 < endCharacters && (characters[1] | 0x20) == 'x' && isASCIIHexDigit(characters[2]))
+        number = jsHexIntegerLiteral(characters, endCharacters);
+    else
+        number = jsStrDecimalLiteral(characters, endCharacters);
+    
+    // Allow trailing white space.
+    for (; characters < endCharacters; ++characters) {
+        if (!isStrWhiteSpace(*characters))
+            break;
+    }
+    if (characters != endCharacters)
+        return QNaN;
+    
+    return number;

 }
 
 }
 

-JSValue JSC_HOST_CALL globalFuncParseInt(ExecState* exec, JSObject*, JSValue, const ArgList& args)
+// See ecma-262 9.3.1
+double jsToNumber(const String& s)

 {
 {

-    JSValue value = args.at(0);
-    int32_t radix = args.at(1).toInt32(exec);
-
-    if (radix != 0 && radix != 10)
-        return jsNumber(exec, parseInt(value.toString(exec), radix));
-
-    if (value.isInt32())
-        return value;
-
-    if (value.isDouble()) {
-        double d = value.asDouble();
-        if (isfinite(d))
-            return jsNumber(exec, (d > 0) ? floor(d) : ceil(d));
-        if (isnan(d) || isinf(d))
-            return jsNaN(exec);
-        return jsNumber(exec, 0);
+    unsigned size = s.length();
+
+    if (size == 1) {
+        UChar c = s[0];
+        if (isASCIIDigit(c))
+            return c - '0';
+        if (isStrWhiteSpace(c))
+            return 0;
+        return QNaN;

     }
 
     }
 

-    return jsNumber(exec, parseInt(value.toString(exec), radix));
+    if (s.is8Bit())
+        return toDouble(s.characters8(), size);
+    return toDouble(s.characters16(), size);

 }
 
 }
 

-JSValue JSC_HOST_CALL globalFuncParseFloat(ExecState* exec, JSObject*, JSValue, const ArgList& args)
+static double parseFloat(const String& s)

 {
 {

-    return jsNumber(exec, parseFloat(args.at(0).toString(exec)));
+    unsigned size = s.length();
+
+    if (size == 1) {
+        UChar c = s[0];
+        if (isASCIIDigit(c))
+            return c - '0';
+        return QNaN;
+    }
+
+    if (s.is8Bit()) {
+        const LChar* data = s.characters8();
+        const LChar* end = data + size;
+
+        // Skip leading white space.
+        for (; data < end; ++data) {
+            if (!isStrWhiteSpace(*data))
+                break;
+        }
+
+        // Empty string.
+        if (data == end)
+            return QNaN;
+
+        return jsStrDecimalLiteral(data, end);
+    }
+
+    const UChar* data = s.characters16();
+    const UChar* end = data + size;
+
+    // Skip leading white space.
+    for (; data < end; ++data) {
+        if (!isStrWhiteSpace(*data))
+            break;
+    }
+
+    // Empty string.
+    if (data == end)
+        return QNaN;
+
+    return jsStrDecimalLiteral(data, end);
+}
+
+EncodedJSValue JSC_HOST_CALL globalFuncEval(ExecState* exec)
+{
+    JSValue x = exec->argument(0);
+    if (!x.isString())
+        return JSValue::encode(x);
+
+    String s = x.toString(exec)->value(exec);
+
+    if (s.is8Bit()) {
+        LiteralParser<LChar> preparser(exec, s.characters8(), s.length(), NonStrictJSON);
+        if (JSValue parsedObject = preparser.tryLiteralParse())
+            return JSValue::encode(parsedObject);
+    } else {
+        LiteralParser<UChar> preparser(exec, s.characters16(), s.length(), NonStrictJSON);
+        if (JSValue parsedObject = preparser.tryLiteralParse())
+            return JSValue::encode(parsedObject);        
+    }
+
+    JSGlobalObject* calleeGlobalObject = exec->callee()->globalObject();
+    EvalExecutable* eval = EvalExecutable::create(exec, exec->vm().codeCache(), makeSource(s), false);
+    JSObject* error = eval->compile(exec, calleeGlobalObject);
+    if (error)
+        return throwVMError(exec, error);
+
+    return JSValue::encode(exec->interpreter()->execute(eval, exec, calleeGlobalObject->globalThis(), calleeGlobalObject));

 }
 
 }
 

-JSValue JSC_HOST_CALL globalFuncIsNaN(ExecState* exec, JSObject*, JSValue, const ArgList& args)
+EncodedJSValue JSC_HOST_CALL globalFuncParseInt(ExecState* exec)

 {
 {

-    return jsBoolean(isnan(args.at(0).toNumber(exec)));
+    JSValue value = exec->argument(0);
+    JSValue radixValue = exec->argument(1);
+
+    // Optimized handling for numbers:
+    // If the argument is 0 or a number in range 10^-6 <= n < INT_MAX+1, then parseInt
+    // results in a truncation to integer. In the case of -0, this is converted to 0.
+    //
+    // This is also a truncation for values in the range INT_MAX+1 <= n < 10^21,
+    // however these values cannot be trivially truncated to int since 10^21 exceeds
+    // even the int64_t range. Negative numbers are a little trickier, the case for
+    // values in the range -10^21 < n <= -1 are similar to those for integer, but
+    // values in the range -1 < n <= -10^-6 need to truncate to -0, not 0.
+    static const double tenToTheMinus6 = 0.000001;
+    static const double intMaxPlusOne = 2147483648.0;
+    if (value.isNumber()) {
+        double n = value.asNumber();
+        if (((n < intMaxPlusOne && n >= tenToTheMinus6) || !n) && radixValue.isUndefinedOrNull())
+            return JSValue::encode(jsNumber(static_cast<int32_t>(n)));
+    }
+
+    // If ToString throws, we shouldn't call ToInt32.
+    String s = value.toString(exec)->value(exec);
+    if (exec->hadException())
+        return JSValue::encode(jsUndefined());
+
+    return JSValue::encode(jsNumber(parseInt(s, radixValue.toInt32(exec))));

 }
 
 }
 

-JSValue JSC_HOST_CALL globalFuncIsFinite(ExecState* exec, JSObject*, JSValue, const ArgList& args)
+EncodedJSValue JSC_HOST_CALL globalFuncParseFloat(ExecState* exec)

 {
 {

-    double n = args.at(0).toNumber(exec);
-    return jsBoolean(!isnan(n) && !isinf(n));
+    return JSValue::encode(jsNumber(parseFloat(exec->argument(0).toString(exec)->value(exec))));

 }
 
 }
 

-JSValue JSC_HOST_CALL globalFuncDecodeURI(ExecState* exec, JSObject*, JSValue, const ArgList& args)
+EncodedJSValue JSC_HOST_CALL globalFuncIsNaN(ExecState* exec)
+{
+    return JSValue::encode(jsBoolean(std::isnan(exec->argument(0).toNumber(exec))));
+}
+
+EncodedJSValue JSC_HOST_CALL globalFuncIsFinite(ExecState* exec)
+{
+    double n = exec->argument(0).toNumber(exec);
+    return JSValue::encode(jsBoolean(std::isfinite(n)));
+}
+
+EncodedJSValue JSC_HOST_CALL globalFuncDecodeURI(ExecState* exec)

 {
     static const char do_not_unescape_when_decoding_URI[] =
         "#$&+,/:;=?@";
 
 {
     static const char do_not_unescape_when_decoding_URI[] =
         "#$&+,/:;=?@";
 

-    return decode(exec, args, do_not_unescape_when_decoding_URI, true);
+    return JSValue::encode(decode(exec, do_not_unescape_when_decoding_URI, true));

 }
 
 }
 

-JSValue JSC_HOST_CALL globalFuncDecodeURIComponent(ExecState* exec, JSObject*, JSValue, const ArgList& args)
+EncodedJSValue JSC_HOST_CALL globalFuncDecodeURIComponent(ExecState* exec)

 {
 {

-    return decode(exec, args, "", true);
+    return JSValue::encode(decode(exec, "", true));

 }
 
 }
 

-JSValue JSC_HOST_CALL globalFuncEncodeURI(ExecState* exec, JSObject*, JSValue, const ArgList& args)
+EncodedJSValue JSC_HOST_CALL globalFuncEncodeURI(ExecState* exec)

 {
     static const char do_not_escape_when_encoding_URI[] =
         "ABCDEFGHIJKLMNOPQRSTUVWXYZ"
 {
     static const char do_not_escape_when_encoding_URI[] =
         "ABCDEFGHIJKLMNOPQRSTUVWXYZ"


@@ -358,10 +590,10 @@ JSValue JSC_HOST_CALL globalFuncEncodeURI(ExecState* exec, JSObject*, JSValue, c
         "0123456789"
         "!#$&'()*+,-./:;=?@_~";
 
         "0123456789"
         "!#$&'()*+,-./:;=?@_~";
 

-    return encode(exec, args, do_not_escape_when_encoding_URI);
+    return JSValue::encode(encode(exec, do_not_escape_when_encoding_URI));

 }
 
 }
 

-JSValue JSC_HOST_CALL globalFuncEncodeURIComponent(ExecState* exec, JSObject*, JSValue, const ArgList& args)
+EncodedJSValue JSC_HOST_CALL globalFuncEncodeURIComponent(ExecState* exec)

 {
     static const char do_not_escape_when_encoding_URI_component[] =
         "ABCDEFGHIJKLMNOPQRSTUVWXYZ"
 {
     static const char do_not_escape_when_encoding_URI_component[] =
         "ABCDEFGHIJKLMNOPQRSTUVWXYZ"


@@ -369,10 +601,10 @@ JSValue JSC_HOST_CALL globalFuncEncodeURIComponent(ExecState* exec, JSObject*, J
         "0123456789"
         "!'()*-._~";
 
         "0123456789"
         "!'()*-._~";
 

-    return encode(exec, args, do_not_escape_when_encoding_URI_component);
+    return JSValue::encode(encode(exec, do_not_escape_when_encoding_URI_component));

 }
 
 }
 

-JSValue JSC_HOST_CALL globalFuncEscape(ExecState* exec, JSObject*, JSValue, const ArgList& args)
+EncodedJSValue JSC_HOST_CALL globalFuncEscape(ExecState* exec)

 {
     static const char do_not_escape[] =
         "ABCDEFGHIJKLMNOPQRSTUVWXYZ"
 {
     static const char do_not_escape[] =
         "ABCDEFGHIJKLMNOPQRSTUVWXYZ"


@@ -380,64 +612,133 @@ JSValue JSC_HOST_CALL globalFuncEscape(ExecState* exec, JSObject*, JSValue, cons
         "0123456789"
         "*+-./@_";
 
         "0123456789"
         "*+-./@_";
 

-    UString result = "";
-    UString s;
-    UString str = args.at(0).toString(exec);
-    const UChar* c = str.data();
-    for (int k = 0; k < str.size(); k++, c++) {
+    JSStringBuilder builder;
+    String str = exec->argument(0).toString(exec)->value(exec);
+    if (str.is8Bit()) {
+        const LChar* c = str.characters8();
+        for (unsigned k = 0; k < str.length(); k++, c++) {
+            int u = c[0];
+            if (u && strchr(do_not_escape, static_cast<char>(u)))
+                builder.append(c, 1);
+            else {
+                char tmp[4];
+                snprintf(tmp, sizeof(tmp), "%%%02X", u);
+                builder.append(tmp);
+            }
+        }
+
+        return JSValue::encode(builder.build(exec));        
+    }
+
+    const UChar* c = str.characters16();
+    for (unsigned k = 0; k < str.length(); k++, c++) {

         int u = c[0];
         if (u > 255) {
             char tmp[7];
             snprintf(tmp, sizeof(tmp), "%%u%04X", u);
         int u = c[0];
         if (u > 255) {
             char tmp[7];
             snprintf(tmp, sizeof(tmp), "%%u%04X", u);

-            s = UString(tmp);
+            builder.append(tmp);

         } else if (u != 0 && strchr(do_not_escape, static_cast<char>(u)))
         } else if (u != 0 && strchr(do_not_escape, static_cast<char>(u)))

-            s = UString(c, 1);
+            builder.append(c, 1);

         else {
             char tmp[4];
             snprintf(tmp, sizeof(tmp), "%%%02X", u);
         else {
             char tmp[4];
             snprintf(tmp, sizeof(tmp), "%%%02X", u);

-            s = UString(tmp);
+            builder.append(tmp);

         }
         }

-        result += s;

     }
 
     }
 

-    return jsString(exec, result);
+    return JSValue::encode(builder.build(exec));

 }
 
 }
 

-JSValue JSC_HOST_CALL globalFuncUnescape(ExecState* exec, JSObject*, JSValue, const ArgList& args)
+EncodedJSValue JSC_HOST_CALL globalFuncUnescape(ExecState* exec)

 {
 {

-    UString result = "";
-    UString str = args.at(0).toString(exec);
+    StringBuilder builder;
+    String str = exec->argument(0).toString(exec)->value(exec);

     int k = 0;
     int k = 0;

-    int len = str.size();
-    while (k < len) {
-        const UChar* c = str.data() + k;
-        UChar u;
-        if (c[0] == '%' && k <= len - 6 && c[1] == 'u') {
-            if (isASCIIHexDigit(c[2]) && isASCIIHexDigit(c[3]) && isASCIIHexDigit(c[4]) && isASCIIHexDigit(c[5])) {
-                u = Lexer::convertUnicode(c[2], c[3], c[4], c[5]);
-                c = &u;
-                k += 5;
+    int len = str.length();
+    
+    if (str.is8Bit()) {
+        const LChar* characters = str.characters8();
+        LChar convertedLChar;
+        while (k < len) {
+            const LChar* c = characters + k;
+            if (c[0] == '%' && k <= len - 6 && c[1] == 'u') {
+                if (isASCIIHexDigit(c[2]) && isASCIIHexDigit(c[3]) && isASCIIHexDigit(c[4]) && isASCIIHexDigit(c[5])) {
+                    builder.append(Lexer<UChar>::convertUnicode(c[2], c[3], c[4], c[5]));
+                    k += 6;
+                    continue;
+                }
+            } else if (c[0] == '%' && k <= len - 3 && isASCIIHexDigit(c[1]) && isASCIIHexDigit(c[2])) {
+                convertedLChar = LChar(Lexer<LChar>::convertHex(c[1], c[2]));
+                c = &convertedLChar;
+                k += 2;
+            }
+            builder.append(*c);
+            k++;
+        }        
+    } else {
+        const UChar* characters = str.characters16();
+
+        while (k < len) {
+            const UChar* c = characters + k;
+            UChar convertedUChar;
+            if (c[0] == '%' && k <= len - 6 && c[1] == 'u') {
+                if (isASCIIHexDigit(c[2]) && isASCIIHexDigit(c[3]) && isASCIIHexDigit(c[4]) && isASCIIHexDigit(c[5])) {
+                    convertedUChar = Lexer<UChar>::convertUnicode(c[2], c[3], c[4], c[5]);
+                    c = &convertedUChar;
+                    k += 5;
+                }
+            } else if (c[0] == '%' && k <= len - 3 && isASCIIHexDigit(c[1]) && isASCIIHexDigit(c[2])) {
+                convertedUChar = UChar(Lexer<UChar>::convertHex(c[1], c[2]));
+                c = &convertedUChar;
+                k += 2;

             }
             }

-        } else if (c[0] == '%' && k <= len - 3 && isASCIIHexDigit(c[1]) && isASCIIHexDigit(c[2])) {
-            u = UChar(Lexer::convertHex(c[1], c[2]));
-            c = &u;
-            k += 2;
+            k++;
+            builder.append(*c);

         }
         }

-        k++;
-        result.append(*c);

     }
 
     }
 

-    return jsString(exec, result);
+    return JSValue::encode(jsString(exec, builder.toString()));
+}
+
+EncodedJSValue JSC_HOST_CALL globalFuncThrowTypeError(ExecState* exec)
+{
+    return throwVMTypeError(exec);
+}
+
+EncodedJSValue JSC_HOST_CALL globalFuncProtoGetter(ExecState* exec)
+{
+    if (!exec->thisValue().isObject())
+        return JSValue::encode(exec->thisValue().synthesizePrototype(exec));
+
+    JSObject* thisObject = asObject(exec->thisValue());
+    if (!thisObject->allowsAccessFrom(exec->trueCallerFrame()))
+        return JSValue::encode(jsUndefined());
+
+    return JSValue::encode(thisObject->prototype());

 }
 
 }
 

-#ifndef NDEBUG
-JSValue JSC_HOST_CALL globalFuncJSCPrint(ExecState* exec, JSObject*, JSValue, const ArgList& args)
+EncodedJSValue JSC_HOST_CALL globalFuncProtoSetter(ExecState* exec)

 {
 {

-    CStringBuffer string;
-    args.at(0).toString(exec).getCString(string);
-    puts(string.data());
-    return jsUndefined();
+    JSValue value = exec->argument(0);
+
+    // Setting __proto__ of a primitive should have no effect.
+    if (!exec->thisValue().isObject())
+        return JSValue::encode(jsUndefined());
+
+    JSObject* thisObject = asObject(exec->thisValue());
+    if (!thisObject->allowsAccessFrom(exec->trueCallerFrame()))
+        return JSValue::encode(jsUndefined());
+
+    // Setting __proto__ to a non-object, non-null value is silently ignored to match Mozilla.
+    if (!value.isObject() && !value.isNull())
+        return JSValue::encode(jsUndefined());
+
+    if (!thisObject->isExtensible())
+        return throwVMError(exec, createTypeError(exec, StrictModeReadonlyPropertyWriteError));
+
+    if (!thisObject->setPrototypeWithCycleCheck(exec->vm(), value))
+        throwError(exec, createError(exec, "cyclic __proto__ value"));
+    return JSValue::encode(jsUndefined());

 }
 }

-#endif

 
 } // namespace JSC
 
 } // namespace JSC