LLVM  10.0.0svn
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 #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