aboutsummaryrefslogtreecommitdiffstats
path: root/include/clang/Basic/LangOptions.h
blob: 5f808f04e9ae7705fa3560d968dcbea844f80032 (plain) (blame)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
//===- LangOptions.h - C Language Family Language Options -------*- C++ -*-===//
//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
//===----------------------------------------------------------------------===//
//
/// \file
/// Defines the clang::LangOptions interface.
//
//===----------------------------------------------------------------------===//

#ifndef LLVM_CLANG_BASIC_LANGOPTIONS_H
#define LLVM_CLANG_BASIC_LANGOPTIONS_H

#include "clang/Basic/CommentOptions.h"
#include "clang/Basic/LLVM.h"
#include "clang/Basic/ObjCRuntime.h"
#include "clang/Basic/Sanitizers.h"
#include "clang/Basic/Visibility.h"
#include "llvm/ADT/StringRef.h"
#include "llvm/ADT/Triple.h"
#include <string>
#include <vector>

namespace clang {

/// Bitfields of LangOptions, split out from LangOptions in order to ensure that
/// this large collection of bitfields is a trivial class type.
class LangOptionsBase {
public:
  // Define simple language options (with no accessors).
#define LANGOPT(Name, Bits, Default, Description) unsigned Name : Bits;
#define ENUM_LANGOPT(Name, Type, Bits, Default, Description)
#include "clang/Basic/LangOptions.def"

protected:
  // Define language options of enumeration type. These are private, and will
  // have accessors (below).
#define LANGOPT(Name, Bits, Default, Description)
#define ENUM_LANGOPT(Name, Type, Bits, Default, Description) \
  unsigned Name : Bits;
#include "clang/Basic/LangOptions.def"
};

/// Keeps track of the various options that can be
/// enabled, which controls the dialect of C or C++ that is accepted.
class LangOptions : public LangOptionsBase {
public:
  using Visibility = clang::Visibility;

  enum GCMode { NonGC, GCOnly, HybridGC };
  enum StackProtectorMode { SSPOff, SSPOn, SSPStrong, SSPReq };

  // Automatic variables live on the stack, and when trivial they're usually
  // uninitialized because it's undefined behavior to use them without
  // initializing them.
  enum class TrivialAutoVarInitKind { Uninitialized, Zero, Pattern };

  enum SignedOverflowBehaviorTy {
    // Default C standard behavior.
    SOB_Undefined,

    // -fwrapv
    SOB_Defined,

    // -ftrapv
    SOB_Trapping
  };

  // FIXME: Unify with TUKind.
  enum CompilingModuleKind {
    /// Not compiling a module interface at all.
    CMK_None,

    /// Compiling a module from a module map.
    CMK_ModuleMap,

    /// Compiling a module from a list of header files.
    CMK_HeaderModule,

    /// Compiling a C++ modules TS module interface unit.
    CMK_ModuleInterface,
  };

  enum PragmaMSPointersToMembersKind {
    PPTMK_BestCase,
    PPTMK_FullGeneralitySingleInheritance,
    PPTMK_FullGeneralityMultipleInheritance,
    PPTMK_FullGeneralityVirtualInheritance
  };

  enum DefaultCallingConvention {
    DCC_None,
    DCC_CDecl,
    DCC_FastCall,
    DCC_StdCall,
    DCC_VectorCall,
    DCC_RegCall
  };

  enum AddrSpaceMapMangling { ASMM_Target, ASMM_On, ASMM_Off };

  // Corresponds to _MSC_VER
  enum MSVCMajorVersion {
    MSVC2010 = 1600,
    MSVC2012 = 1700,
    MSVC2013 = 1800,
    MSVC2015 = 1900,
    MSVC2017 = 1910,
    MSVC2017_5 = 1912,
    MSVC2017_7 = 1914,
  };

  /// Clang versions with different platform ABI conformance.
  enum class ClangABI {
    /// Attempt to be ABI-compatible with code generated by Clang 3.8.x
    /// (SVN r257626). This causes <1 x long long> to be passed in an
    /// integer register instead of an SSE register on x64_64.
    Ver3_8,

    /// Attempt to be ABI-compatible with code generated by Clang 4.0.x
    /// (SVN r291814). This causes move operations to be ignored when
    /// determining whether a class type can be passed or returned directly.
    Ver4,

    /// Attempt to be ABI-compatible with code generated by Clang 6.0.x
    /// (SVN r321711). This causes determination of whether a type is
    /// standard-layout to ignore collisions between empty base classes
    /// and between base classes and member subobjects, which affects
    /// whether we reuse base class tail padding in some ABIs.
    Ver6,

    /// Attempt to be ABI-compatible with code generated by Clang 7.0.x
    /// (SVN r338536). This causes alignof (C++) and _Alignof (C11) to be
    /// compatible with __alignof (i.e., return the preferred alignment)
    /// rather than returning the required alignment.
    Ver7,

    /// Attempt to be ABI-compatible with code generated by Clang 9.0.x
    /// (SVN r351319). This causes vectors of __int128 to be passed in memory
    /// instead of passing in multiple scalar registers on x86_64 on Linux and
    /// NetBSD.
    Ver9,

    /// Conform to the underlying platform's C and C++ ABIs as closely
    /// as we can.
    Latest
  };

  enum class CoreFoundationABI {
    /// No interoperability ABI has been specified
    Unspecified,
    /// CoreFoundation does not have any language interoperability
    Standalone,
    /// Interoperability with the ObjectiveC runtime
    ObjectiveC,
    /// Interoperability with the latest known version of the Swift runtime
    Swift,
    /// Interoperability with the Swift 5.0 runtime
    Swift5_0,
    /// Interoperability with the Swift 4.2 runtime
    Swift4_2,
    /// Interoperability with the Swift 4.1 runtime
    Swift4_1,
  };

  enum FPContractModeKind {
    // Form fused FP ops only where result will not be affected.
    FPC_Off,

    // Form fused FP ops according to FP_CONTRACT rules.
    FPC_On,

    // Aggressively fuse FP ops (E.g. FMA).
    FPC_Fast
  };

  // TODO: merge FEnvAccessModeKind and FPContractModeKind
  enum FEnvAccessModeKind {
    FEA_Off,

    FEA_On
  };

  enum class LaxVectorConversionKind {
    /// Permit no implicit vector bitcasts.
    None,
    /// Permit vector bitcasts between integer vectors with different numbers
    /// of elements but the same total bit-width.
    Integer,
    /// Permit vector bitcasts between all vectors with the same total
    /// bit-width.
    All,
  };

public:
  /// Set of enabled sanitizers.
  SanitizerSet Sanitize;

  /// Paths to blacklist files specifying which objects
  /// (files, functions, variables) should not be instrumented.
  std::vector<std::string> SanitizerBlacklistFiles;

  /// Paths to the XRay "always instrument" files specifying which
  /// objects (files, functions, variables) should be imbued with the XRay
  /// "always instrument" attribute.
  /// WARNING: This is a deprecated field and will go away in the future.
  std::vector<std::string> XRayAlwaysInstrumentFiles;

  /// Paths to the XRay "never instrument" files specifying which
  /// objects (files, functions, variables) should be imbued with the XRay
  /// "never instrument" attribute.
  /// WARNING: This is a deprecated field and will go away in the future.
  std::vector<std::string> XRayNeverInstrumentFiles;

  /// Paths to the XRay attribute list files, specifying which objects
  /// (files, functions, variables) should be imbued with the appropriate XRay
  /// attribute(s).
  std::vector<std::string> XRayAttrListFiles;

  clang::ObjCRuntime ObjCRuntime;

  CoreFoundationABI CFRuntime = CoreFoundationABI::Unspecified;

  std::string ObjCConstantStringClass;

  /// The name of the handler function to be called when -ftrapv is
  /// specified.
  ///
  /// If none is specified, abort (GCC-compatible behaviour).
  std::string OverflowHandler;

  /// The module currently being compiled as specified by -fmodule-name.
  std::string ModuleName;

  /// The name of the current module, of which the main source file
  /// is a part. If CompilingModule is set, we are compiling the interface
  /// of this module, otherwise we are compiling an implementation file of
  /// it. This starts as ModuleName in case -fmodule-name is provided and
  /// changes during compilation to reflect the current module.
  std::string CurrentModule;

  /// The names of any features to enable in module 'requires' decls
  /// in addition to the hard-coded list in Module.cpp and the target features.
  ///
  /// This list is sorted.
  std::vector<std::string> ModuleFeatures;

  /// Options for parsing comments.
  CommentOptions CommentOpts;

  /// A list of all -fno-builtin-* function names (e.g., memset).
  std::vector<std::string> NoBuiltinFuncs;

  /// Triples of the OpenMP targets that the host code codegen should
  /// take into account in order to generate accurate offloading descriptors.
  std::vector<llvm::Triple> OMPTargetTriples;

  /// Name of the IR file that contains the result of the OpenMP target
  /// host code generation.
  std::string OMPHostIRFile;

  /// Indicates whether the front-end is explicitly told that the
  /// input is a header file (i.e. -x c-header).
  bool IsHeaderFile = false;

  LangOptions();

  // Define accessors/mutators for language options of enumeration type.
#define LANGOPT(Name, Bits, Default, Description)
#define ENUM_LANGOPT(Name, Type, Bits, Default, Description) \
  Type get##Name() const { return static_cast<Type>(Name); } \
  void set##Name(Type Value) { Name = static_cast<unsigned>(Value); }
#include "clang/Basic/LangOptions.def"

  /// Are we compiling a module interface (.cppm or module map)?
  bool isCompilingModule() const {
    return getCompilingModule() != CMK_None;
  }

  /// Do we need to track the owning module for a local declaration?
  bool trackLocalOwningModule() const {
    return isCompilingModule() || ModulesLocalVisibility;
  }

  bool isSignedOverflowDefined() const {
    return getSignedOverflowBehavior() == SOB_Defined;
  }

  bool isSubscriptPointerArithmetic() const {
    return ObjCRuntime.isSubscriptPointerArithmetic() &&
           !ObjCSubscriptingLegacyRuntime;
  }

  bool isCompatibleWithMSVC(MSVCMajorVersion MajorVersion) const {
    return MSCompatibilityVersion >= MajorVersion * 100000U;
  }

  /// Reset all of the options that are not considered when building a
  /// module.
  void resetNonModularOptions();

  /// Is this a libc/libm function that is no longer recognized as a
  /// builtin because a -fno-builtin-* option has been specified?
  bool isNoBuiltinFunc(StringRef Name) const;

  /// True if any ObjC types may have non-trivial lifetime qualifiers.
  bool allowsNonTrivialObjCLifetimeQualifiers() const {
    return ObjCAutoRefCount || ObjCWeak;
  }

  bool assumeFunctionsAreConvergent() const {
    return (CUDA && CUDAIsDevice) || OpenCL;
  }

  /// Return the OpenCL C or C++ version as a VersionTuple.
  VersionTuple getOpenCLVersionTuple() const;
};

/// Floating point control options
class FPOptions {
public:
  FPOptions() : fp_contract(LangOptions::FPC_Off),
                fenv_access(LangOptions::FEA_Off) {}

  // Used for serializing.
  explicit FPOptions(unsigned I)
      : fp_contract(static_cast<LangOptions::FPContractModeKind>(I & 3)),
        fenv_access(static_cast<LangOptions::FEnvAccessModeKind>((I >> 2) & 1))
        {}

  explicit FPOptions(const LangOptions &LangOpts)
      : fp_contract(LangOpts.getDefaultFPContractMode()),
        fenv_access(LangOptions::FEA_Off) {}
  // FIXME: Use getDefaultFEnvAccessMode() when available.

  bool allowFPContractWithinStatement() const {
    return fp_contract == LangOptions::FPC_On;
  }

  bool allowFPContractAcrossStatement() const {
    return fp_contract == LangOptions::FPC_Fast;
  }

  void setAllowFPContractWithinStatement() {
    fp_contract = LangOptions::FPC_On;
  }

  void setAllowFPContractAcrossStatement() {
    fp_contract = LangOptions::FPC_Fast;
  }

  void setDisallowFPContract() { fp_contract = LangOptions::FPC_Off; }

  bool allowFEnvAccess() const {
    return fenv_access == LangOptions::FEA_On;
  }

  void setAllowFEnvAccess() {
    fenv_access = LangOptions::FEA_On;
  }

  void setDisallowFEnvAccess() { fenv_access = LangOptions::FEA_Off; }

  /// Used to serialize this.
  unsigned getInt() const { return fp_contract | (fenv_access << 2); }

private:
  /// Adjust BinaryOperator::FPFeatures to match the total bit-field size
  /// of these two.
  unsigned fp_contract : 2;
  unsigned fenv_access : 1;
};

/// Describes the kind of translation unit being processed.
enum TranslationUnitKind {
  /// The translation unit is a complete translation unit.
  TU_Complete,

  /// The translation unit is a prefix to a translation unit, and is
  /// not complete.
  TU_Prefix,

  /// The translation unit is a module.
  TU_Module
};

} // namespace clang

#endif // LLVM_CLANG_BASIC_LANGOPTIONS_H