libcxxabi/src/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 // This file is contains a subset of macros copied from
   8 // llvm/include/llvm/Demangle/DemangleConfig.h
   9 //===----------------------------------------------------------------------===//
  10
  11 #ifndef LIBCXXABI_DEMANGLE_DEMANGLE_CONFIG_H
  12 #define LIBCXXABI_DEMANGLE_DEMANGLE_CONFIG_H
  13
  14 // Must be defined before pulling in headers from libc++. Allow downstream
  15 // build systems to override this value.
  16 // https://libcxx.llvm.org/UsingLibcxx.html#enabling-the-safe-libc-mode
  17 #ifndef _LIBCPP_VERBOSE_ABORT
  18 #define _LIBCPP_VERBOSE_ABORT(...) abort_message(__VA_ARGS__)
  19 #include "../abort_message.h"
  20 #endif
  21
  22 #include <ciso646>
  23
  24 #ifdef _MSC_VER
  25 // snprintf is implemented in VS 2015
  26 #if _MSC_VER < 1900
  27 #define snprintf _snprintf_s
  28 #endif
  29 #endif
  30
  31 #ifndef __has_feature
  32 #define __has_feature(x) 0
  33 #endif
  34
  35 #ifndef __has_cpp_attribute
  36 #define __has_cpp_attribute(x) 0
  37 #endif
  38
  39 #ifndef __has_attribute
  40 #define __has_attribute(x) 0
  41 #endif
  42
  43 #ifndef __has_builtin
  44 #define __has_builtin(x) 0
  45 #endif
  46
  47 #ifndef DEMANGLE_GNUC_PREREQ
  48 #if defined(__GNUC__) && defined(__GNUC_MINOR__) && defined(__GNUC_PATCHLEVEL__)
  49 #define DEMANGLE_GNUC_PREREQ(maj, min, patch)                           \
  50   ((__GNUC__ << 20) + (__GNUC_MINOR__ << 10) + __GNUC_PATCHLEVEL__ >=          \
  51    ((maj) << 20) + ((min) << 10) + (patch))
  52 #elif defined(__GNUC__) && defined(__GNUC_MINOR__)
  53 #define DEMANGLE_GNUC_PREREQ(maj, min, patch)                           \
  54   ((__GNUC__ << 20) + (__GNUC_MINOR__ << 10) >= ((maj) << 20) + ((min) << 10))
  55 #else
  56 #define DEMANGLE_GNUC_PREREQ(maj, min, patch) 0
  57 #endif
  58 #endif
  59
  60 #if __has_attribute(used) || DEMANGLE_GNUC_PREREQ(3, 1, 0)
  61 #define DEMANGLE_ATTRIBUTE_USED __attribute__((__used__))
  62 #else
  63 #define DEMANGLE_ATTRIBUTE_USED
  64 #endif
  65
  66 #if __has_builtin(__builtin_unreachable) || DEMANGLE_GNUC_PREREQ(4, 5, 0)
  67 #define DEMANGLE_UNREACHABLE __builtin_unreachable()
  68 #elif defined(_MSC_VER)
  69 #define DEMANGLE_UNREACHABLE __assume(false)
  70 #else
  71 #define DEMANGLE_UNREACHABLE
  72 #endif
  73
  74 #if __has_attribute(noinline) || DEMANGLE_GNUC_PREREQ(3, 4, 0)
  75 #define DEMANGLE_ATTRIBUTE_NOINLINE __attribute__((noinline))
  76 #elif defined(_MSC_VER)
  77 #define DEMANGLE_ATTRIBUTE_NOINLINE __declspec(noinline)
  78 #else
  79 #define DEMANGLE_ATTRIBUTE_NOINLINE
  80 #endif
  81
  82 #if !defined(NDEBUG)
  83 #define DEMANGLE_DUMP_METHOD DEMANGLE_ATTRIBUTE_NOINLINE DEMANGLE_ATTRIBUTE_USED
  84 #else
  85 #define DEMANGLE_DUMP_METHOD DEMANGLE_ATTRIBUTE_NOINLINE
  86 #endif
  87
  88 #if __cplusplus > 201402L && __has_cpp_attribute(fallthrough)
  89 #define DEMANGLE_FALLTHROUGH [[fallthrough]]
  90 #elif __has_cpp_attribute(gnu::fallthrough)
  91 #define DEMANGLE_FALLTHROUGH [[gnu::fallthrough]]
  92 #elif !__cplusplus
  93 // Workaround for llvm.org/PR23435, since clang 3.6 and below emit a spurious
  94 // error when __has_cpp_attribute is given a scoped attribute in C mode.
  95 #define DEMANGLE_FALLTHROUGH
  96 #elif __has_cpp_attribute(clang::fallthrough)
  97 #define DEMANGLE_FALLTHROUGH [[clang::fallthrough]]
  98 #else
  99 #define DEMANGLE_FALLTHROUGH
 100 #endif
 101
 102 #define DEMANGLE_NAMESPACE_BEGIN namespace { namespace itanium_demangle {
 103 #define DEMANGLE_NAMESPACE_END } }
 104
 105 #endif // LIBCXXABI_DEMANGLE_DEMANGLE_CONFIG_H