LLVM 20.0.0git
DemangleConfig.h
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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#ifndef DEMANGLE_ASSERT
90#include <cassert>
91#define DEMANGLE_ASSERT(__expr, __msg) assert((__expr) && (__msg))
92#endif
93
94#define DEMANGLE_NAMESPACE_BEGIN namespace llvm { namespace itanium_demangle {
95#define DEMANGLE_NAMESPACE_END } }
96
97#endif