LLVM  9.0.0svn
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_COMPILER_H
16 #define LLVM_DEMANGLE_COMPILER_H
17 
18 #ifdef _MSC_VER
19 // snprintf is implemented in VS 2015
20 #if _MSC_VER < 1900
21 #define snprintf _snprintf_s
22 #endif
23 #endif
24 
25 #ifndef __has_feature
26 #define __has_feature(x) 0
27 #endif
28 
29 #ifndef __has_cpp_attribute
30 #define __has_cpp_attribute(x) 0
31 #endif
32 
33 #ifndef __has_attribute
34 #define __has_attribute(x) 0
35 #endif
36 
37 #ifndef __has_builtin
38 #define __has_builtin(x) 0
39 #endif
40 
41 #ifndef DEMANGLE_GNUC_PREREQ
42 #if defined(__GNUC__) && defined(__GNUC_MINOR__) && defined(__GNUC_PATCHLEVEL__)
43 #define DEMANGLE_GNUC_PREREQ(maj, min, patch) \
44  ((__GNUC__ << 20) + (__GNUC_MINOR__ << 10) + __GNUC_PATCHLEVEL__ >= \
45  ((maj) << 20) + ((min) << 10) + (patch))
46 #elif defined(__GNUC__) && defined(__GNUC_MINOR__)
47 #define DEMANGLE_GNUC_PREREQ(maj, min, patch) \
48  ((__GNUC__ << 20) + (__GNUC_MINOR__ << 10) >= ((maj) << 20) + ((min) << 10))
49 #else
50 #define DEMANGLE_GNUC_PREREQ(maj, min, patch) 0
51 #endif
52 #endif
53 
54 #if __has_attribute(used) || DEMANGLE_GNUC_PREREQ(3, 1, 0)
55 #define DEMANGLE_ATTRIBUTE_USED __attribute__((__used__))
56 #else
57 #define DEMANGLE_ATTRIBUTE_USED
58 #endif
59 
60 #if __has_builtin(__builtin_unreachable) || DEMANGLE_GNUC_PREREQ(4, 5, 0)
61 #define DEMANGLE_UNREACHABLE __builtin_unreachable()
62 #elif defined(_MSC_VER)
63 #define DEMANGLE_UNREACHABLE __assume(false)
64 #else
65 #define DEMANGLE_UNREACHABLE
66 #endif
67 
68 #if __has_attribute(noinline) || DEMANGLE_GNUC_PREREQ(3, 4, 0)
69 #define DEMANGLE_ATTRIBUTE_NOINLINE __attribute__((noinline))
70 #elif defined(_MSC_VER)
71 #define DEMANGLE_ATTRIBUTE_NOINLINE __declspec(noinline)
72 #else
73 #define DEMANGLE_ATTRIBUTE_NOINLINE
74 #endif
75 
76 #if !defined(NDEBUG)
77 #define DEMANGLE_DUMP_METHOD DEMANGLE_ATTRIBUTE_NOINLINE DEMANGLE_ATTRIBUTE_USED
78 #else
79 #define DEMANGLE_DUMP_METHOD DEMANGLE_ATTRIBUTE_NOINLINE
80 #endif
81 
82 #if __cplusplus > 201402L && __has_cpp_attribute(fallthrough)
83 #define DEMANGLE_FALLTHROUGH [[fallthrough]]
84 #elif __has_cpp_attribute(gnu::fallthrough)
85 #define DEMANGLE_FALLTHROUGH [[gnu::fallthrough]]
86 #elif !__cplusplus
87 // Workaround for llvm.org/PR23435, since clang 3.6 and below emit a spurious
88 // error when __has_cpp_attribute is given a scoped attribute in C mode.
89 #define DEMANGLE_FALLTHROUGH
90 #elif __has_cpp_attribute(clang::fallthrough)
91 #define DEMANGLE_FALLTHROUGH [[clang::fallthrough]]
92 #else
93 #define DEMANGLE_FALLTHROUGH
94 #endif
95 
96 #define DEMANGLE_NAMESPACE_BEGIN namespace llvm { namespace itanium_demangle {
97 #define DEMANGLE_NAMESPACE_END } }
98 
99 #endif