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1 //===--- LangOptions.h - C Language Family Language Options -----*- C++ -*-===//
2 //
3 //                     The LLVM Compiler Infrastructure
4 //
5 // This file is distributed under the University of Illinois Open Source
6 // License. See LICENSE.TXT for details.
7 //
8 //===----------------------------------------------------------------------===//
9 //
10 //  This file defines the LangOptions interface.
11 //
12 //===----------------------------------------------------------------------===//
13 
14 #ifndef LLVM_CLANG_LANGOPTIONS_H
15 #define LLVM_CLANG_LANGOPTIONS_H
16 
17 #include <string>
18 #include "clang/Basic/LLVM.h"
19 #include "clang/Basic/Visibility.h"
20 #include "llvm/ADT/IntrusiveRefCntPtr.h"
21 
22 namespace clang {
23 
24 /// Bitfields of LangOptions, split out from LangOptions in order to ensure that
25 /// this large collection of bitfields is a trivial class type.
26 class LangOptionsBase {
27 public:
28   // Define simple language options (with no accessors).
29 #define LANGOPT(Name, Bits, Default, Description) unsigned Name : Bits;
30 #define ENUM_LANGOPT(Name, Type, Bits, Default, Description)
31 #include "clang/Basic/LangOptions.def"
32 
33 protected:
34   // Define language options of enumeration type. These are private, and will
35   // have accessors (below).
36 #define LANGOPT(Name, Bits, Default, Description)
37 #define ENUM_LANGOPT(Name, Type, Bits, Default, Description) \
38   unsigned Name : Bits;
39 #include "clang/Basic/LangOptions.def"
40 };
41 
42 /// LangOptions - This class keeps track of the various options that can be
43 /// enabled, which controls the dialect of C that is accepted.
44 class LangOptions : public RefCountedBase<LangOptions>, public LangOptionsBase {
45 public:
46   typedef clang::Visibility Visibility;
47 
48   enum GCMode { NonGC, GCOnly, HybridGC };
49   enum StackProtectorMode { SSPOff, SSPOn, SSPReq };
50 
51   enum SignedOverflowBehaviorTy {
52     SOB_Undefined,  // Default C standard behavior.
53     SOB_Defined,    // -fwrapv
54     SOB_Trapping    // -ftrapv
55   };
56 
57 public:
58   std::string ObjCConstantStringClass;
59 
60   /// The name of the handler function to be called when -ftrapv is specified.
61   /// If none is specified, abort (GCC-compatible behaviour).
62   std::string OverflowHandler;
63 
64   /// \brief The name of the current module.
65   std::string CurrentModule;
66 
67   LangOptions();
68 
69   // Define accessors/mutators for language options of enumeration type.
70 #define LANGOPT(Name, Bits, Default, Description)
71 #define ENUM_LANGOPT(Name, Type, Bits, Default, Description) \
72   Type get##Name() const { return static_cast<Type>(Name); } \
73   void set##Name(Type Value) { Name = static_cast<unsigned>(Value); }
74 #include "clang/Basic/LangOptions.def"
75 
isSignedOverflowDefined()76   bool isSignedOverflowDefined() const {
77     return getSignedOverflowBehavior() == SOB_Defined;
78   }
79 
80   /// \brief Reset all of the options that are not considered when building a
81   /// module.
82   void resetNonModularOptions();
83 };
84 
85 /// Floating point control options
86 class FPOptions {
87 public:
88   unsigned fp_contract : 1;
89 
FPOptions()90   FPOptions() : fp_contract(0) {}
91 
FPOptions(const LangOptions & LangOpts)92   FPOptions(const LangOptions &LangOpts) :
93     fp_contract(LangOpts.DefaultFPContract) {}
94 };
95 
96 /// OpenCL volatile options
97 class OpenCLOptions {
98 public:
99 #define OPENCLEXT(nm)  unsigned nm : 1;
100 #include "clang/Basic/OpenCLExtensions.def"
101 
OpenCLOptions()102   OpenCLOptions() {
103 #define OPENCLEXT(nm)   nm = 0;
104 #include "clang/Basic/OpenCLExtensions.def"
105   }
106 };
107 
108 /// \brief Describes the kind of translation unit being processed.
109 enum TranslationUnitKind {
110   /// \brief The translation unit is a complete translation unit.
111   TU_Complete,
112   /// \brief The translation unit is a prefix to a translation unit, and is
113   /// not complete.
114   TU_Prefix,
115   /// \brief The translation unit is a module.
116   TU_Module
117 };
118 
119   /// \brief
120 }  // end namespace clang
121 
122 #endif
123