include/llvm/Demangle/DemangleConfig.h

   1 //===--- DemangleConfig.h ---------------------------------------*- C++ -*-===//
   2 //
   3 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
   4 // See https://llvm.org/LICENSE.txt for license information.
   5 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
   6 //
   7 //===----------------------------------------------------------------------===//
   8 //
   9 // This file contains a variety of feature test macros copied from
  10 // include/llvm/Support/Compiler.h so that LLVMDemangle does not need to take
  11 // a dependency on LLVMSupport.
  12 //
  13 //===----------------------------------------------------------------------===//
  14
  15 #ifndef LLVM_DEMANGLE_COMPILER_H
  16 #define LLVM_DEMANGLE_COMPILER_H
  17
  18 #ifndef __has_feature
  19 #define __has_feature(x) 0
  20 #endif
  21
  22 #ifndef __has_cpp_attribute
  23 #define __has_cpp_attribute(x) 0
  24 #endif
  25
  26 #ifndef __has_attribute
  27 #define __has_attribute(x) 0
  28 #endif
  29
  30 #ifndef __has_builtin
  31 #define __has_builtin(x) 0
  32 #endif
  33
  34 #ifndef DEMANGLE_GNUC_PREREQ
  35 #if defined(__GNUC__) && defined(__GNUC_MINOR__) && defined(__GNUC_PATCHLEVEL__)
  36 #define DEMANGLE_GNUC_PREREQ(maj, min, patch)                           \
  37   ((__GNUC__ << 20) + (__GNUC_MINOR__ << 10) + __GNUC_PATCHLEVEL__ >=          \
  38    ((maj) << 20) + ((min) << 10) + (patch))
  39 #elif defined(__GNUC__) && defined(__GNUC_MINOR__)
  40 #define DEMANGLE_GNUC_PREREQ(maj, min, patch)                           \
  41   ((__GNUC__ << 20) + (__GNUC_MINOR__ << 10) >= ((maj) << 20) + ((min) << 10))
  42 #else
  43 #define DEMANGLE_GNUC_PREREQ(maj, min, patch) 0
  44 #endif
  45 #endif
  46
  47 #if __has_attribute(used) || DEMANGLE_GNUC_PREREQ(3, 1, 0)
  48 #define DEMANGLE_ATTRIBUTE_USED __attribute__((__used__))
  49 #else
  50 #define DEMANGLE_ATTRIBUTE_USED
  51 #endif
  52
  53 #if __has_builtin(__builtin_unreachable) || DEMANGLE_GNUC_PREREQ(4, 5, 0)
  54 #define DEMANGLE_UNREACHABLE __builtin_unreachable()
  55 #elif defined(_MSC_VER)
  56 #define DEMANGLE_UNREACHABLE __assume(false)
  57 #else
  58 #define DEMANGLE_UNREACHABLE
  59 #endif
  60
  61 #if __has_attribute(noinline) || DEMANGLE_GNUC_PREREQ(3, 4, 0)
  62 #define DEMANGLE_ATTRIBUTE_NOINLINE __attribute__((noinline))
  63 #elif defined(_MSC_VER)
  64 #define DEMANGLE_ATTRIBUTE_NOINLINE __declspec(noinline)
  65 #else
  66 #define DEMANGLE_ATTRIBUTE_NOINLINE
  67 #endif
  68
  69 #if !defined(NDEBUG)
  70 #define DEMANGLE_DUMP_METHOD DEMANGLE_ATTRIBUTE_NOINLINE DEMANGLE_ATTRIBUTE_USED
  71 #else
  72 #define DEMANGLE_DUMP_METHOD DEMANGLE_ATTRIBUTE_NOINLINE
  73 #endif
  74
  75 #if __cplusplus > 201402L && __has_cpp_attribute(fallthrough)
  76 #define DEMANGLE_FALLTHROUGH [[fallthrough]]
  77 #elif __has_cpp_attribute(gnu::fallthrough)
  78 #define DEMANGLE_FALLTHROUGH [[gnu::fallthrough]]
  79 #elif !__cplusplus
  80 // Workaround for llvm.org/PR23435, since clang 3.6 and below emit a spurious
  81 // error when __has_cpp_attribute is given a scoped attribute in C mode.
  82 #define DEMANGLE_FALLTHROUGH
  83 #elif __has_cpp_attribute(clang::fallthrough)
  84 #define DEMANGLE_FALLTHROUGH [[clang::fallthrough]]
  85 #else
  86 #define DEMANGLE_FALLTHROUGH
  87 #endif
  88
  89 #define DEMANGLE_NAMESPACE_BEGIN namespace llvm { namespace itanium_demangle {
  90 #define DEMANGLE_NAMESPACE_END } }
  91
  92 #endif