bytecode/ResolveGlobalStatus.cpp

   1 /*
   2  * Copyright (C) 2012 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 "ResolveGlobalStatus.h"
  28
  29 #include "CodeBlock.h"
  30 #include "JSCJSValue.h"
  31 #include "Operations.h"
  32 #include "Structure.h"
  33
  34 namespace JSC {
  35
  36 static ResolveGlobalStatus computeForStructure(CodeBlock* codeBlock, Structure* structure, Identifier& identifier)
  37 {
  38     unsigned attributesIgnored;
  39     JSCell* specificValue;
  40     PropertyOffset offset = structure->get(*codeBlock->vm(), identifier, attributesIgnored, specificValue);
  41     if (structure->isDictionary())
  42         specificValue = 0;
  43     if (!isValidOffset(offset))
  44         return ResolveGlobalStatus();
  45
  46     return ResolveGlobalStatus(ResolveGlobalStatus::Simple, structure, offset, specificValue);
  47 }
  48
  49 ResolveGlobalStatus ResolveGlobalStatus::computeFor(CodeBlock* codeBlock, int, ResolveOperation* operation, Identifier& identifier)
  50 {
  51     ASSERT(operation->m_operation == ResolveOperation::GetAndReturnGlobalProperty);
  52     if (!operation->m_structure)
  53         return ResolveGlobalStatus();
  54
  55     return computeForStructure(codeBlock, operation->m_structure.get(), identifier);
  56 }
  57
  58 } // namespace JSC
  59