| Andrew Scull | 0372a57 | 2018-11-16 15:47:06 +0000 | [diff] [blame] | 1 | //===--- Compiler.h ---------------------------------------------*- C++ -*-===// |
| 2 | // |
| 3 | // The LLVM Compiler Infrastructure |
| 4 | // |
| 5 | // This file is distributed under the University of Illinois Open Source |
| 6 | // License. See LICENSE.TXT for details. |
| 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 | #ifndef LLVM_DEMANGLE_COMPILER_H |
| 15 | #define LLVM_DEMANGLE_COMPILER_H |
| 16 | |
| 17 | #ifdef _MSC_VER |
| 18 | // snprintf is implemented in VS 2015 |
| 19 | #if _MSC_VER < 1900 |
| 20 | #define snprintf _snprintf_s |
| 21 | #endif |
| 22 | #endif |
| 23 | |
| 24 | #ifndef __has_feature |
| 25 | #define __has_feature(x) 0 |
| 26 | #endif |
| 27 | |
| 28 | #ifndef __has_cpp_attribute |
| 29 | #define __has_cpp_attribute(x) 0 |
| 30 | #endif |
| 31 | |
| 32 | #ifndef __has_attribute |
| 33 | #define __has_attribute(x) 0 |
| 34 | #endif |
| 35 | |
| 36 | #ifndef __has_builtin |
| 37 | #define __has_builtin(x) 0 |
| 38 | #endif |
| 39 | |
| 40 | #ifndef LLVM_GNUC_PREREQ |
| 41 | #if defined(__GNUC__) && defined(__GNUC_MINOR__) && defined(__GNUC_PATCHLEVEL__) |
| 42 | #define LLVM_GNUC_PREREQ(maj, min, patch) \ |
| 43 | ((__GNUC__ << 20) + (__GNUC_MINOR__ << 10) + __GNUC_PATCHLEVEL__ >= \ |
| 44 | ((maj) << 20) + ((min) << 10) + (patch)) |
| 45 | #elif defined(__GNUC__) && defined(__GNUC_MINOR__) |
| 46 | #define LLVM_GNUC_PREREQ(maj, min, patch) \ |
| 47 | ((__GNUC__ << 20) + (__GNUC_MINOR__ << 10) >= ((maj) << 20) + ((min) << 10)) |
| 48 | #else |
| 49 | #define LLVM_GNUC_PREREQ(maj, min, patch) 0 |
| 50 | #endif |
| 51 | #endif |
| 52 | |
| 53 | #if __has_attribute(used) || LLVM_GNUC_PREREQ(3, 1, 0) |
| 54 | #define LLVM_ATTRIBUTE_USED __attribute__((__used__)) |
| 55 | #else |
| 56 | #define LLVM_ATTRIBUTE_USED |
| 57 | #endif |
| 58 | |
| 59 | #if __has_builtin(__builtin_unreachable) || LLVM_GNUC_PREREQ(4, 5, 0) |
| 60 | #define LLVM_BUILTIN_UNREACHABLE __builtin_unreachable() |
| 61 | #elif defined(_MSC_VER) |
| 62 | #define LLVM_BUILTIN_UNREACHABLE __assume(false) |
| 63 | #endif |
| 64 | |
| 65 | #if __has_attribute(noinline) || LLVM_GNUC_PREREQ(3, 4, 0) |
| 66 | #define LLVM_ATTRIBUTE_NOINLINE __attribute__((noinline)) |
| 67 | #elif defined(_MSC_VER) |
| 68 | #define LLVM_ATTRIBUTE_NOINLINE __declspec(noinline) |
| 69 | #else |
| 70 | #define LLVM_ATTRIBUTE_NOINLINE |
| 71 | #endif |
| 72 | |
| 73 | #if !defined(NDEBUG) || defined(LLVM_ENABLE_DUMP) |
| 74 | #define LLVM_DUMP_METHOD LLVM_ATTRIBUTE_NOINLINE LLVM_ATTRIBUTE_USED |
| 75 | #else |
| 76 | #define LLVM_DUMP_METHOD LLVM_ATTRIBUTE_NOINLINE |
| 77 | #endif |
| 78 | |
| 79 | #if __cplusplus > 201402L && __has_cpp_attribute(fallthrough) |
| 80 | #define LLVM_FALLTHROUGH [[fallthrough]] |
| 81 | #elif __has_cpp_attribute(gnu::fallthrough) |
| 82 | #define LLVM_FALLTHROUGH [[gnu::fallthrough]] |
| 83 | #elif !__cplusplus |
| 84 | // Workaround for llvm.org/PR23435, since clang 3.6 and below emit a spurious |
| 85 | // error when __has_cpp_attribute is given a scoped attribute in C mode. |
| 86 | #define LLVM_FALLTHROUGH |
| 87 | #elif __has_cpp_attribute(clang::fallthrough) |
| 88 | #define LLVM_FALLTHROUGH [[clang::fallthrough]] |
| 89 | #else |
| 90 | #define LLVM_FALLTHROUGH |
| 91 | #endif |
| 92 | |
| 93 | #endif |