JavaScriptCore-1097.13.tar.gz

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

diff --git a/runtime/Identifier.cpp b/runtime/Identifier.cpp
index f2642a93f13bba05b437fe056ce9c95c78ca1d1f..182bcc462022b4ec2cbac6855c5029f64c711fff 100644 (file)
--- a/runtime/Identifier.cpp
+++ b/runtime/Identifier.cpp
@@ -22,39 +22,20 @@
 #include "Identifier.h"
 
 #include "CallFrame.h"
 #include "Identifier.h"
 
 #include "CallFrame.h"

+#include "JSObject.h"

 #include "NumericStrings.h"
 #include "NumericStrings.h"

+#include "ScopeChain.h"

 #include <new> // for placement new
 #include <string.h> // for strlen
 #include <wtf/Assertions.h>
 #include <wtf/FastMalloc.h>
 #include <wtf/HashSet.h>
 #include <new> // for placement new
 #include <string.h> // for strlen
 #include <wtf/Assertions.h>
 #include <wtf/FastMalloc.h>
 #include <wtf/HashSet.h>

-#include <wtf/WTFThreadData.h>

 #include <wtf/text/StringHash.h>
 
 using WTF::ThreadSpecific;
 
 namespace JSC {
 
 #include <wtf/text/StringHash.h>
 
 using WTF::ThreadSpecific;
 
 namespace JSC {
 

-IdentifierTable::~IdentifierTable()
-{
-    HashSet<StringImpl*>::iterator end = m_table.end();
-    for (HashSet<StringImpl*>::iterator iter = m_table.begin(); iter != end; ++iter)
-        (*iter)->setIsIdentifier(false);
-}
-std::pair<HashSet<StringImpl*>::iterator, bool> IdentifierTable::add(StringImpl* value)
-{
-    std::pair<HashSet<StringImpl*>::iterator, bool> result = m_table.add(value);
-    (*result.first)->setIsIdentifier(true);
-    return result;
-}
-template<typename U, typename V>
-std::pair<HashSet<StringImpl*>::iterator, bool> IdentifierTable::add(U value)
-{
-    std::pair<HashSet<StringImpl*>::iterator, bool> result = m_table.add<U, V>(value);
-    (*result.first)->setIsIdentifier(true);
-    return result;
-}
-

 IdentifierTable* createIdentifierTable()
 {
     return new IdentifierTable;
 IdentifierTable* createIdentifierTable()
 {
     return new IdentifierTable;


@@ -65,58 +46,62 @@ void deleteIdentifierTable(IdentifierTable* table)
     delete table;
 }
 
     delete table;
 }
 

-bool Identifier::equal(const UString::Rep* r, const char* s)
-{
-    int length = r->length();
-    const UChar* d = r->characters();
-    for (int i = 0; i != length; ++i)
-        if (d[i] != (unsigned char)s[i])
-            return false;
-    return s[length] == 0;
-}
-
-bool Identifier::equal(const UString::Rep* r, const UChar* s, unsigned length)
-{
-    if (r->length() != length)
-        return false;
-    const UChar* d = r->characters();
-    for (unsigned i = 0; i != length; ++i)
-        if (d[i] != s[i])
-            return false;
-    return true;
-}
-

 struct IdentifierCStringTranslator {
 struct IdentifierCStringTranslator {

-    static unsigned hash(const char* c)
+    static unsigned hash(const LChar* c)

     {
     {

-        return UString::Rep::computeHash(c);
+        return StringHasher::computeHash<LChar>(c);

     }
 
     }
 

-    static bool equal(UString::Rep* r, const char* s)
+    static bool equal(StringImpl* r, const LChar* s)

     {
         return Identifier::equal(r, s);
     }
 
     {
         return Identifier::equal(r, s);
     }
 

-    static void translate(UString::Rep*& location, const char* c, unsigned hash)
+    static void translate(StringImpl*& location, const LChar* c, unsigned hash)

     {
     {

-        size_t length = strlen(c);
-        UChar* d;
-        UString::Rep* r = UString::Rep::createUninitialized(length, d).releaseRef();
+        size_t length = strlen(reinterpret_cast<const char*>(c));
+        LChar* d;
+        StringImpl* r = StringImpl::createUninitialized(length, d).leakRef();

         for (size_t i = 0; i != length; i++)
         for (size_t i = 0; i != length; i++)

-            d[i] = static_cast<unsigned char>(c[i]); // use unsigned char to zero-extend instead of sign-extend
+            d[i] = c[i];

         r->setHash(hash);
         location = r;
     }
 };
 
         r->setHash(hash);
         location = r;
     }
 };
 

-PassRefPtr<UString::Rep> Identifier::add(JSGlobalData* globalData, const char* c)
+struct IdentifierLCharFromUCharTranslator {
+    static unsigned hash(const CharBuffer<UChar>& buf)
+    {
+        return StringHasher::computeHash<UChar>(buf.s, buf.length);
+    }
+    
+    static bool equal(StringImpl* str, const CharBuffer<UChar>& buf)
+    {
+        return Identifier::equal(str, buf.s, buf.length);
+    }
+    
+    static void translate(StringImpl*& location, const CharBuffer<UChar>& buf, unsigned hash)
+    {
+        LChar* d;
+        StringImpl* r = StringImpl::createUninitialized(buf.length, d).leakRef();
+        for (unsigned i = 0; i != buf.length; i++) {
+            UChar c = buf.s[i];
+            ASSERT(c <= 0xff);
+            d[i] = c;
+        }
+        r->setHash(hash);
+        location = r; 
+    }
+};
+
+PassRefPtr<StringImpl> Identifier::add(JSGlobalData* globalData, const char* c)

 {
     if (!c)
 {
     if (!c)

-        return UString::null().rep();
+        return 0;

     if (!c[0])
     if (!c[0])

-        return UString::Rep::empty();
+        return StringImpl::empty();

     if (!c[1])
     if (!c[1])

-        return add(globalData, globalData->smallStrings.singleCharacterStringRep(static_cast<unsigned char>(c[0])));
+        return add(globalData, globalData->smallStrings.singleCharacterStringRep(c[0]));

 
     IdentifierTable& identifierTable = *globalData->identifierTable;
     LiteralIdentifierTable& literalIdentifierTable = identifierTable.literalTable();
 
     IdentifierTable& identifierTable = *globalData->identifierTable;
     LiteralIdentifierTable& literalIdentifierTable = identifierTable.literalTable();


@@ -125,72 +110,92 @@ PassRefPtr<UString::Rep> Identifier::add(JSGlobalData* globalData, const char* c
     if (iter != literalIdentifierTable.end())
         return iter->second;
 
     if (iter != literalIdentifierTable.end())
         return iter->second;
 

-    pair<HashSet<UString::Rep*>::iterator, bool> addResult = identifierTable.add<const char*, IdentifierCStringTranslator>(c);
+    HashSet<StringImpl*>::AddResult addResult = identifierTable.add<const LChar*, IdentifierCStringTranslator>(reinterpret_cast<const LChar*>(c));

 
     // If the string is newly-translated, then we need to adopt it.
     // The boolean in the pair tells us if that is so.
 
     // If the string is newly-translated, then we need to adopt it.
     // The boolean in the pair tells us if that is so.

-    RefPtr<UString::Rep> addedString = addResult.second ? adoptRef(*addResult.first) : *addResult.first;
+    RefPtr<StringImpl> addedString = addResult.isNewEntry ? adoptRef(*addResult.iterator) : *addResult.iterator;

 
     literalIdentifierTable.add(c, addedString.get());
 
     return addedString.release();
 }
 
 
     literalIdentifierTable.add(c, addedString.get());
 
     return addedString.release();
 }
 

-PassRefPtr<UString::Rep> Identifier::add(ExecState* exec, const char* c)
+PassRefPtr<StringImpl> Identifier::add(ExecState* exec, const char* c)

 {
     return add(&exec->globalData(), c);
 }
 
 {
     return add(&exec->globalData(), c);
 }
 

-struct UCharBuffer {
-    const UChar* s;
-    unsigned int length;
-};
-
-struct IdentifierUCharBufferTranslator {
-    static unsigned hash(const UCharBuffer& buf)
-    {
-        return UString::Rep::computeHash(buf.s, buf.length);
-    }
-
-    static bool equal(UString::Rep* str, const UCharBuffer& buf)
-    {
-        return Identifier::equal(str, buf.s, buf.length);
-    }
-
-    static void translate(UString::Rep*& location, const UCharBuffer& buf, unsigned hash)
-    {
-        UChar* d;
-        UString::Rep* r = UString::Rep::createUninitialized(buf.length, d).releaseRef();
-        for (unsigned i = 0; i != buf.length; i++)
-            d[i] = buf.s[i];
-        r->setHash(hash);
-        location = r; 
-    }
-};
-
-PassRefPtr<UString::Rep> Identifier::add(JSGlobalData* globalData, const UChar* s, int length)
+PassRefPtr<StringImpl> Identifier::add8(JSGlobalData* globalData, const UChar* s, int length)

 {
     if (length == 1) {
         UChar c = s[0];
 {
     if (length == 1) {
         UChar c = s[0];

-        if (c <= 0xFF)
+        ASSERT(c <= 0xff);
+        if (canUseSingleCharacterString(c))

             return add(globalData, globalData->smallStrings.singleCharacterStringRep(c));
     }
             return add(globalData, globalData->smallStrings.singleCharacterStringRep(c));
     }

+    

     if (!length)
     if (!length)

-        return UString::Rep::empty();
-    UCharBuffer buf = {s, length}; 
-    pair<HashSet<UString::Rep*>::iterator, bool> addResult = globalData->identifierTable->add<UCharBuffer, IdentifierUCharBufferTranslator>(buf);
-
+        return StringImpl::empty();
+    CharBuffer<UChar> buf = {s, length}; 
+    HashSet<StringImpl*>::AddResult addResult = globalData->identifierTable->add<CharBuffer<UChar>, IdentifierLCharFromUCharTranslator >(buf);
+    

     // If the string is newly-translated, then we need to adopt it.
     // The boolean in the pair tells us if that is so.
     // If the string is newly-translated, then we need to adopt it.
     // The boolean in the pair tells us if that is so.

-    return addResult.second ? adoptRef(*addResult.first) : *addResult.first;
+    return addResult.isNewEntry ? adoptRef(*addResult.iterator) : *addResult.iterator;
+}
+
+template <typename CharType>
+ALWAYS_INLINE uint32_t Identifier::toUInt32FromCharacters(const CharType* characters, unsigned length, bool& ok)
+{
+    // Get the first character, turning it into a digit.
+    uint32_t value = characters[0] - '0';
+    if (value > 9)
+        return 0;
+    
+    // Check for leading zeros. If the first characher is 0, then the
+    // length of the string must be one - e.g. "042" is not equal to "42".
+    if (!value && length > 1)
+        return 0;
+    
+    while (--length) {
+        // Multiply value by 10, checking for overflow out of 32 bits.
+        if (value > 0xFFFFFFFFU / 10)
+            return 0;
+        value *= 10;
+        
+        // Get the next character, turning it into a digit.
+        uint32_t newValue = *(++characters) - '0';
+        if (newValue > 9)
+            return 0;
+        
+        // Add in the old value, checking for overflow out of 32 bits.
+        newValue += value;
+        if (newValue < value)
+            return 0;
+        value = newValue;
+    }
+    
+    ok = true;
+    return value;

 }
 
 }
 

-PassRefPtr<UString::Rep> Identifier::add(ExecState* exec, const UChar* s, int length)
+uint32_t Identifier::toUInt32(const UString& string, bool& ok)

 {
 {

-    return add(&exec->globalData(), s, length);
+    ok = false;
+
+    unsigned length = string.length();
+
+    // An empty string is not a number.
+    if (!length)
+        return 0;
+
+    if (string.is8Bit())
+        return toUInt32FromCharacters(string.characters8(), length, ok);
+    return toUInt32FromCharacters(string.characters16(), length, ok);

 }
 
 }
 

-PassRefPtr<UString::Rep> Identifier::addSlowCase(JSGlobalData* globalData, UString::Rep* r)
+PassRefPtr<StringImpl> Identifier::addSlowCase(JSGlobalData* globalData, StringImpl* r)

 {
     ASSERT(!r->isIdentifier());
     // The empty & null strings are static singletons, and static strings are handled
 {
     ASSERT(!r->isIdentifier());
     // The empty & null strings are static singletons, and static strings are handled


@@ -198,17 +203,17 @@ PassRefPtr<UString::Rep> Identifier::addSlowCase(JSGlobalData* globalData, UStri
     ASSERT(r->length());
 
     if (r->length() == 1) {
     ASSERT(r->length());
 
     if (r->length() == 1) {

-        UChar c = r->characters()[0];
-        if (c <= 0xFF)
+        UChar c = (*r)[0];
+        if (c <= maxSingleCharacterString)

             r = globalData->smallStrings.singleCharacterStringRep(c);
             if (r->isIdentifier())
                 return r;
     }
 
             r = globalData->smallStrings.singleCharacterStringRep(c);
             if (r->isIdentifier())
                 return r;
     }
 

-    return *globalData->identifierTable->add(r).first;
+    return *globalData->identifierTable->add(r).iterator;

 }
 
 }
 

-PassRefPtr<UString::Rep> Identifier::addSlowCase(ExecState* exec, UString::Rep* r)
+PassRefPtr<StringImpl> Identifier::addSlowCase(ExecState* exec, StringImpl* r)

 {
     return addSlowCase(&exec->globalData(), r);
 }
 {
     return addSlowCase(&exec->globalData(), r);
 }


@@ -228,6 +233,21 @@ Identifier Identifier::from(ExecState* exec, double value)
     return Identifier(exec, exec->globalData().numericStrings.add(value));
 }
 
     return Identifier(exec, exec->globalData().numericStrings.add(value));
 }
 

+Identifier Identifier::from(JSGlobalData* globalData, unsigned value)
+{
+    return Identifier(globalData, globalData->numericStrings.add(value));
+}
+
+Identifier Identifier::from(JSGlobalData* globalData, int value)
+{
+    return Identifier(globalData, globalData->numericStrings.add(value));
+}
+
+Identifier Identifier::from(JSGlobalData* globalData, double value)
+{
+    return Identifier(globalData, globalData->numericStrings.add(value));
+}
+

 #ifndef NDEBUG
 
 void Identifier::checkCurrentIdentifierTable(JSGlobalData* globalData)
 #ifndef NDEBUG
 
 void Identifier::checkCurrentIdentifierTable(JSGlobalData* globalData)


@@ -246,8 +266,8 @@ void Identifier::checkCurrentIdentifierTable(ExecState* exec)
 
 // These only exists so that our exports are the same for debug and release builds.
 // This would be an ASSERT_NOT_REACHED(), but we're in NDEBUG only code here!
 
 // These only exists so that our exports are the same for debug and release builds.
 // This would be an ASSERT_NOT_REACHED(), but we're in NDEBUG only code here!

-void Identifier::checkCurrentIdentifierTable(JSGlobalData*) { CRASH(); }
-void Identifier::checkCurrentIdentifierTable(ExecState*) { CRASH(); }
+NO_RETURN_DUE_TO_CRASH void Identifier::checkCurrentIdentifierTable(JSGlobalData*) { CRASH(); }
+NO_RETURN_DUE_TO_CRASH void Identifier::checkCurrentIdentifierTable(ExecState*) { CRASH(); }

 
 #endif
 
 
 #endif