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      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_DEMANGLECONFIG_H
     16 #define LLVM_DEMANGLE_DEMANGLECONFIG_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
     93