parser/ParserModes.h

   1 /*
   2  * Copyright (C) 2012, 2013 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. AND ITS CONTRIBUTORS ``AS IS''
  14  * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
  15  * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
  16  * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR ITS CONTRIBUTORS
  17  * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
  18  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
  19  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
  20  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
  21  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
  22  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
  23  * THE POSSIBILITY OF SUCH DAMAGE.
  24  */
  25
  26
  27 #ifndef ParserModes_h
  28 #define ParserModes_h
  29
  30 #include "Identifier.h"
  31
  32 namespace JSC {
  33
  34 enum class JSParserStrictMode { NotStrict, Strict };
  35 enum class JSParserBuiltinMode { NotBuiltin, Builtin };
  36 enum class JSParserCodeType { Program, Function };
  37
  38 enum class ConstructorKind { None, Base, Derived };
  39 enum class SuperBinding { Needed, NotNeeded };
  40 enum class ThisTDZMode { AlwaysCheck, CheckIfNeeded };
  41
  42 enum ProfilerMode { ProfilerOff, ProfilerOn };
  43 enum DebuggerMode { DebuggerOff, DebuggerOn };
  44
  45 enum FunctionMode { FunctionExpression, FunctionDeclaration };
  46
  47 inline bool functionNameIsInScope(const Identifier& name, FunctionMode functionMode)
  48 {
  49     if (name.isNull())
  50         return false;
  51
  52     if (functionMode != FunctionExpression)
  53         return false;
  54
  55     return true;
  56 }
  57
  58 inline bool functionNameScopeIsDynamic(bool usesEval, bool isStrictMode)
  59 {
  60     // If non-strict eval is in play, a function gets a separate object in the scope chain for its name.
  61     // This enables eval to declare and then delete a name that shadows the function's name.
  62
  63     if (!usesEval)
  64         return false;
  65
  66     if (isStrictMode)
  67         return false;
  68
  69     return true;
  70 }
  71
  72 typedef unsigned CodeFeatures;
  73
  74 const CodeFeatures NoFeatures = 0;
  75 const CodeFeatures EvalFeature = 1 << 0;
  76 const CodeFeatures ArgumentsFeature = 1 << 1;
  77 const CodeFeatures WithFeature = 1 << 2;
  78 const CodeFeatures CatchFeature = 1 << 3;
  79 const CodeFeatures ThisFeature = 1 << 4;
  80 const CodeFeatures StrictModeFeature = 1 << 5;
  81 const CodeFeatures ShadowsArgumentsFeature = 1 << 6;
  82 const CodeFeatures ModifiedParameterFeature = 1 << 7;
  83 const CodeFeatures ModifiedArgumentsFeature = 1 << 8;
  84
  85 const CodeFeatures AllFeatures = EvalFeature | ArgumentsFeature | WithFeature | CatchFeature | ThisFeature | StrictModeFeature | ShadowsArgumentsFeature | ModifiedParameterFeature;
  86
  87 } // namespace JSC
  88
  89 #endif // ParserModes_h