Home | History | Annotate | Download | only in runtime 
      1 /*
      2  * Copyright (C) 2009 Apple Inc. All rights reserved.
      3  *
      4  * Redistribution and use in source and binary forms, with or without
      5  * modification, are permitted provided that the following conditions
      6  * are met:
      7  * 1. Redistributions of source code must retain the above copyright
      8  *    notice, this list of conditions and the following disclaimer.
      9  * 2. Redistributions in binary form must reproduce the above copyright
     10  *    notice, this list of conditions and the following disclaimer in the
     11  *    documentation and/or other materials provided with the distribution.
     12  *
     13  * THIS SOFTWARE IS PROVIDED BY APPLE INC. ``AS IS'' AND ANY
     14  * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
     15  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
     16  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL APPLE INC. OR
     17  * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
     18  * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
     19  * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
     20  * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
     21  * OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
     22  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
     23  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
     24  */
     25 
     26 #include "config.h"
     27 #include "UStringImpl.h"
     28 
     29 #include "Identifier.h"
     30 #include "UString.h"
     31 #include <wtf/unicode/UTF8.h>
     32 
     33 using namespace WTF::Unicode;
     34 using namespace std;
     35 
     36 namespace JSC {
     37 
     38 PassRefPtr<UStringImpl> UStringImpl::create(const char* c)
     39 {
     40     ASSERT(c);
     41 
     42     if (!c[0])
     43         return &UStringImpl::empty();
     44 
     45     size_t length = strlen(c);
     46     UChar* d;
     47     PassRefPtr<UStringImpl> result = UStringImpl::createUninitialized(length, d);
     48     for (size_t i = 0; i < length; i++)
     49         d[i] = static_cast<unsigned char>(c[i]); // use unsigned char to zero-extend instead of sign-extend
     50     return result;
     51 }
     52 
     53 PassRefPtr<UStringImpl> UStringImpl::create(const char* c, int length)
     54 {
     55     ASSERT(c);
     56 
     57     if (!length)
     58         return &UStringImpl::empty();
     59 
     60     UChar* d;
     61     PassRefPtr<UStringImpl> result = UStringImpl::createUninitialized(length, d);
     62     for (int i = 0; i < length; i++)
     63         d[i] = static_cast<unsigned char>(c[i]); // use unsigned char to zero-extend instead of sign-extend
     64     return result;
     65 }
     66 
     67 PassRefPtr<UStringImpl> UStringImpl::create(const UChar* buffer, int length)
     68 {
     69     UChar* newBuffer;
     70     PassRefPtr<UStringImpl> impl = createUninitialized(length, newBuffer);
     71     copyChars(newBuffer, buffer, length);
     72     return impl;
     73 }
     74 
     75 SharedUChar* UStringImpl::baseSharedBuffer()
     76 {
     77     ASSERT((bufferOwnership() == BufferShared)
     78         || ((bufferOwnership() == BufferOwned) && !m_dataBuffer.asPtr<void*>()));
     79 
     80     if (bufferOwnership() != BufferShared)
     81         m_dataBuffer = UntypedPtrAndBitfield(SharedUChar::create(new OwnFastMallocPtr<UChar>(m_data)).releaseRef(), BufferShared);
     82 
     83     return m_dataBuffer.asPtr<SharedUChar*>();
     84 }
     85 
     86 SharedUChar* UStringImpl::sharedBuffer()
     87 {
     88     if (m_length < s_minLengthToShare)
     89         return 0;
     90     ASSERT(!isStatic());
     91 
     92     UStringImpl* owner = bufferOwnerString();
     93     if (owner->bufferOwnership() == BufferInternal)
     94         return 0;
     95 
     96     return owner->baseSharedBuffer();
     97 }
     98 
     99 UStringImpl::~UStringImpl()
    100 {
    101     ASSERT(!isStatic());
    102     checkConsistency();
    103 
    104     if (isIdentifier())
    105         Identifier::remove(this);
    106 
    107     if (bufferOwnership() != BufferInternal) {
    108         if (bufferOwnership() == BufferOwned)
    109             fastFree(m_data);
    110         else if (bufferOwnership() == BufferSubstring)
    111             m_dataBuffer.asPtr<UStringImpl*>()->deref();
    112         else {
    113             ASSERT(bufferOwnership() == BufferShared);
    114             m_dataBuffer.asPtr<SharedUChar*>()->deref();
    115         }
    116     }
    117 }
    118 
    119 }
    120