Compiler.h revision cee033188f7b1a4f1b28b8edce0c1358f19f8158
10c0cc92762bdf34f26762eeaf66f6f8791428db5Chris Lattner//===-- llvm/Support/Compiler.h - Compiler abstraction support --*- C++ -*-===// 20c0cc92762bdf34f26762eeaf66f6f8791428db5Chris Lattner// 30c0cc92762bdf34f26762eeaf66f6f8791428db5Chris Lattner// The LLVM Compiler Infrastructure 40c0cc92762bdf34f26762eeaf66f6f8791428db5Chris Lattner// 57ed47a13356daed2a34cd2209a31f92552e3bdd8Chris Lattner// This file is distributed under the University of Illinois Open Source 67ed47a13356daed2a34cd2209a31f92552e3bdd8Chris Lattner// License. See LICENSE.TXT for details. 70c0cc92762bdf34f26762eeaf66f6f8791428db5Chris Lattner// 80c0cc92762bdf34f26762eeaf66f6f8791428db5Chris Lattner//===----------------------------------------------------------------------===// 90c0cc92762bdf34f26762eeaf66f6f8791428db5Chris Lattner// 100c0cc92762bdf34f26762eeaf66f6f8791428db5Chris Lattner// This file defines several macros, based on the current compiler. This allows 110c0cc92762bdf34f26762eeaf66f6f8791428db5Chris Lattner// use of compiler-specific features in a way that remains portable. 120c0cc92762bdf34f26762eeaf66f6f8791428db5Chris Lattner// 130c0cc92762bdf34f26762eeaf66f6f8791428db5Chris Lattner//===----------------------------------------------------------------------===// 140c0cc92762bdf34f26762eeaf66f6f8791428db5Chris Lattner 150c0cc92762bdf34f26762eeaf66f6f8791428db5Chris Lattner#ifndef LLVM_SUPPORT_COMPILER_H 160c0cc92762bdf34f26762eeaf66f6f8791428db5Chris Lattner#define LLVM_SUPPORT_COMPILER_H 170c0cc92762bdf34f26762eeaf66f6f8791428db5Chris Lattner 18965841cfe4de695fc56cab4821fd7e032ff85b83Michael J. Spencer#ifndef __has_feature 19965841cfe4de695fc56cab4821fd7e032ff85b83Michael J. Spencer# define __has_feature(x) 0 20965841cfe4de695fc56cab4821fd7e032ff85b83Michael J. Spencer#endif 21965841cfe4de695fc56cab4821fd7e032ff85b83Michael J. Spencer 2238dbb606755232e229f11994fc2bbf10e8c5788bJohn McCall/// LLVM_HAS_RVALUE_REFERENCES - Does the compiler provide r-value references? 2338dbb606755232e229f11994fc2bbf10e8c5788bJohn McCall/// This implies that <utility> provides the one-argument std::move; it 2438dbb606755232e229f11994fc2bbf10e8c5788bJohn McCall/// does not imply the existence of any other C++ library features. 2538dbb606755232e229f11994fc2bbf10e8c5788bJohn McCall#if (__has_feature(cxx_rvalue_references) \ 2638dbb606755232e229f11994fc2bbf10e8c5788bJohn McCall || defined(__GXX_EXPERIMENTAL_CXX0X__) \ 27e20cf3d14997c3511e264748c59687a801caa6edBob Wilson || (defined(_MSC_VER) && _MSC_VER >= 1600)) 2838dbb606755232e229f11994fc2bbf10e8c5788bJohn McCall#define LLVM_USE_RVALUE_REFERENCES 1 2938dbb606755232e229f11994fc2bbf10e8c5788bJohn McCall#else 3038dbb606755232e229f11994fc2bbf10e8c5788bJohn McCall#define LLVM_USE_RVALUE_REFERENCES 0 3138dbb606755232e229f11994fc2bbf10e8c5788bJohn McCall#endif 3238dbb606755232e229f11994fc2bbf10e8c5788bJohn McCall 3338dbb606755232e229f11994fc2bbf10e8c5788bJohn McCall/// llvm_move - Expands to ::std::move if the compiler supports 3438dbb606755232e229f11994fc2bbf10e8c5788bJohn McCall/// r-value references; otherwise, expands to the argument. 3538dbb606755232e229f11994fc2bbf10e8c5788bJohn McCall#if LLVM_USE_RVALUE_REFERENCES 3686062e6782798cb52a79fce22c1e4371148f120dJohn McCall#define llvm_move(value) (::std::move(value)) 3738dbb606755232e229f11994fc2bbf10e8c5788bJohn McCall#else 3838dbb606755232e229f11994fc2bbf10e8c5788bJohn McCall#define llvm_move(value) (value) 3938dbb606755232e229f11994fc2bbf10e8c5788bJohn McCall#endif 4038dbb606755232e229f11994fc2bbf10e8c5788bJohn McCall 41b9d565ac998fc857b20786bae08bb30719eb966bMichael J. Spencer/// LLVM_DELETED_FUNCTION - Expands to = delete if the compiler supports it. 42b9d565ac998fc857b20786bae08bb30719eb966bMichael J. Spencer/// Use to mark functions as uncallable. Member functions with this should 43cee033188f7b1a4f1b28b8edce0c1358f19f8158Craig Topper/// be declared private so that some behavior is kept in C++03 mode. 44b9d565ac998fc857b20786bae08bb30719eb966bMichael J. Spencer/// 45b9d565ac998fc857b20786bae08bb30719eb966bMichael J. Spencer/// class DontCopy { 46b9d565ac998fc857b20786bae08bb30719eb966bMichael J. Spencer/// private: 47b9d565ac998fc857b20786bae08bb30719eb966bMichael J. Spencer/// DontCopy(const DontCopy&) LLVM_DELETED_FUNCTION; 48b9d565ac998fc857b20786bae08bb30719eb966bMichael J. Spencer/// DontCopy &operator =(const DontCopy&) LLVM_DELETED_FUNCTION; 49b9d565ac998fc857b20786bae08bb30719eb966bMichael J. Spencer/// public: 50b9d565ac998fc857b20786bae08bb30719eb966bMichael J. Spencer/// ... 51b9d565ac998fc857b20786bae08bb30719eb966bMichael J. Spencer/// }; 52b9d565ac998fc857b20786bae08bb30719eb966bMichael J. Spencer#if (__has_feature(cxx_deleted_functions) \ 53b9d565ac998fc857b20786bae08bb30719eb966bMichael J. Spencer || defined(__GXX_EXPERIMENTAL_CXX0X__)) 54b9d565ac998fc857b20786bae08bb30719eb966bMichael J. Spencer // No version of MSVC currently supports this. 55b9d565ac998fc857b20786bae08bb30719eb966bMichael J. Spencer#define LLVM_DELETED_FUNCTION = delete 56b9d565ac998fc857b20786bae08bb30719eb966bMichael J. Spencer#else 57b9d565ac998fc857b20786bae08bb30719eb966bMichael J. Spencer#define LLVM_DELETED_FUNCTION 58b9d565ac998fc857b20786bae08bb30719eb966bMichael J. Spencer#endif 59b9d565ac998fc857b20786bae08bb30719eb966bMichael J. Spencer 60fbb13471ed99ab8fdc3dbadb091ee5e2295b7b26Craig Topper/// LLVM_FINAL - Expands to 'final' if the compiler supports it. 61fbb13471ed99ab8fdc3dbadb091ee5e2295b7b26Craig Topper/// Use to mark classes or virtual methods as final. 62fbb13471ed99ab8fdc3dbadb091ee5e2295b7b26Craig Topper#if (__has_feature(cxx_override_control)) 63fbb13471ed99ab8fdc3dbadb091ee5e2295b7b26Craig Topper#define LLVM_FINAL final 64fbb13471ed99ab8fdc3dbadb091ee5e2295b7b26Craig Topper#else 65fbb13471ed99ab8fdc3dbadb091ee5e2295b7b26Craig Topper#define LLVM_FINAL 66fbb13471ed99ab8fdc3dbadb091ee5e2295b7b26Craig Topper#endif 67fbb13471ed99ab8fdc3dbadb091ee5e2295b7b26Craig Topper 68fbb13471ed99ab8fdc3dbadb091ee5e2295b7b26Craig Topper/// LLVM_OVERRIDE - Expands to 'override' if the compiler supports it. 69fbb13471ed99ab8fdc3dbadb091ee5e2295b7b26Craig Topper/// Use to mark virtual methods as overriding a base class method. 70fbb13471ed99ab8fdc3dbadb091ee5e2295b7b26Craig Topper#if (__has_feature(cxx_override_control)) 71fbb13471ed99ab8fdc3dbadb091ee5e2295b7b26Craig Topper#define LLVM_OVERRIDE override 72fbb13471ed99ab8fdc3dbadb091ee5e2295b7b26Craig Topper#else 73fbb13471ed99ab8fdc3dbadb091ee5e2295b7b26Craig Topper#define LLVM_OVERRIDE 74fbb13471ed99ab8fdc3dbadb091ee5e2295b7b26Craig Topper#endif 75fbb13471ed99ab8fdc3dbadb091ee5e2295b7b26Craig Topper 7616d8f8bd919b72866e687d99f3aa94a140137c59Duncan Sands/// LLVM_LIBRARY_VISIBILITY - If a class marked with this attribute is linked 7716d8f8bd919b72866e687d99f3aa94a140137c59Duncan Sands/// into a shared library, then the class should be private to the library and 7816d8f8bd919b72866e687d99f3aa94a140137c59Duncan Sands/// not accessible from outside it. Can also be used to mark variables and 7916d8f8bd919b72866e687d99f3aa94a140137c59Duncan Sands/// functions, making them private to any shared library they are linked into. 8097816e1badb4bf781d646986301e41ddea6f721cDuncan Sands#if (__GNUC__ >= 4) && !defined(__MINGW32__) && !defined(__CYGWIN__) 8116d8f8bd919b72866e687d99f3aa94a140137c59Duncan Sands#define LLVM_LIBRARY_VISIBILITY __attribute__ ((visibility("hidden"))) 820c0cc92762bdf34f26762eeaf66f6f8791428db5Chris Lattner#else 8316d8f8bd919b72866e687d99f3aa94a140137c59Duncan Sands#define LLVM_LIBRARY_VISIBILITY 840c0cc92762bdf34f26762eeaf66f6f8791428db5Chris Lattner#endif 850c0cc92762bdf34f26762eeaf66f6f8791428db5Chris Lattner 86cb89f6cc10d63e61115a6acc4e2703fbd0823253Julien Lerouge#if (__GNUC__ >= 4 || (__GNUC__ == 3 && __GNUC_MINOR__ >= 1)) 87100c267249d1d03c4f96eede9877a4f9f54f2247Chandler Carruth#define LLVM_ATTRIBUTE_USED __attribute__((__used__)) 880d885d1661f87bd2dc25bfdacb29413f0be81bd4Devang Patel#else 89100c267249d1d03c4f96eede9877a4f9f54f2247Chandler Carruth#define LLVM_ATTRIBUTE_USED 900d885d1661f87bd2dc25bfdacb29413f0be81bd4Devang Patel#endif 910c0cc92762bdf34f26762eeaf66f6f8791428db5Chris Lattner 927283da51b8860ca9af4cb5ca082f7bcca3894d99Chandler Carruth// Some compilers warn about unused functions. When a function is sometimes 937283da51b8860ca9af4cb5ca082f7bcca3894d99Chandler Carruth// used or not depending on build settings (e.g. a function only called from 947283da51b8860ca9af4cb5ca082f7bcca3894d99Chandler Carruth// within "assert"), this attribute can be used to suppress such warnings. 957283da51b8860ca9af4cb5ca082f7bcca3894d99Chandler Carruth// 967283da51b8860ca9af4cb5ca082f7bcca3894d99Chandler Carruth// However, it shouldn't be used for unused *variables*, as those have a much 977283da51b8860ca9af4cb5ca082f7bcca3894d99Chandler Carruth// more portable solution: 987283da51b8860ca9af4cb5ca082f7bcca3894d99Chandler Carruth// (void)unused_var_name; 997283da51b8860ca9af4cb5ca082f7bcca3894d99Chandler Carruth// Prefer cast-to-void wherever it is sufficient. 100079b6f5ee5c3516b773a3ad71874c14e8ea7479cBill Wendling#if (__GNUC__ >= 4 || (__GNUC__ == 3 && __GNUC_MINOR__ >= 1)) 101100c267249d1d03c4f96eede9877a4f9f54f2247Chandler Carruth#define LLVM_ATTRIBUTE_UNUSED __attribute__((__unused__)) 102079b6f5ee5c3516b773a3ad71874c14e8ea7479cBill Wendling#else 103100c267249d1d03c4f96eede9877a4f9f54f2247Chandler Carruth#define LLVM_ATTRIBUTE_UNUSED 104079b6f5ee5c3516b773a3ad71874c14e8ea7479cBill Wendling#endif 105079b6f5ee5c3516b773a3ad71874c14e8ea7479cBill Wendling 10675c0d8e0d8f4e10587985b950f2c0752e45e099eDaniel Dunbar#if (__GNUC__ >= 4) && !defined(__MINGW32__) && !defined(__CYGWIN__) 10775c0d8e0d8f4e10587985b950f2c0752e45e099eDaniel Dunbar#define LLVM_ATTRIBUTE_WEAK __attribute__((__weak__)) 1086f0c67d4ffbc9c47153cab94985a22699b699729Chris Lattner#else 10975c0d8e0d8f4e10587985b950f2c0752e45e099eDaniel Dunbar#define LLVM_ATTRIBUTE_WEAK 1106f0c67d4ffbc9c47153cab94985a22699b699729Chris Lattner#endif 1116f0c67d4ffbc9c47153cab94985a22699b699729Chris Lattner 11275c0d8e0d8f4e10587985b950f2c0752e45e099eDaniel Dunbar#ifdef __GNUC__ // aka 'CONST' but following LLVM Conventions. 11375c0d8e0d8f4e10587985b950f2c0752e45e099eDaniel Dunbar#define LLVM_READNONE __attribute__((__const__)) 1146f0c67d4ffbc9c47153cab94985a22699b699729Chris Lattner#else 11575c0d8e0d8f4e10587985b950f2c0752e45e099eDaniel Dunbar#define LLVM_READNONE 1166f0c67d4ffbc9c47153cab94985a22699b699729Chris Lattner#endif 1176f0c67d4ffbc9c47153cab94985a22699b699729Chris Lattner 11875c0d8e0d8f4e10587985b950f2c0752e45e099eDaniel Dunbar#ifdef __GNUC__ // aka 'PURE' but following LLVM Conventions. 11975c0d8e0d8f4e10587985b950f2c0752e45e099eDaniel Dunbar#define LLVM_READONLY __attribute__((__pure__)) 120ec381a4183f70122305f810c6b11b8f0e3bf83c0Nick Lewycky#else 12175c0d8e0d8f4e10587985b950f2c0752e45e099eDaniel Dunbar#define LLVM_READONLY 122ec381a4183f70122305f810c6b11b8f0e3bf83c0Nick Lewycky#endif 123ec381a4183f70122305f810c6b11b8f0e3bf83c0Nick Lewycky 124ec381a4183f70122305f810c6b11b8f0e3bf83c0Nick Lewycky#if (__GNUC__ >= 4) 1254d69a8c8b2133e441503ac9583c4a6056f52e0f3Benjamin Kramer#define LLVM_LIKELY(EXPR) __builtin_expect((bool)(EXPR), true) 1264d69a8c8b2133e441503ac9583c4a6056f52e0f3Benjamin Kramer#define LLVM_UNLIKELY(EXPR) __builtin_expect((bool)(EXPR), false) 127b372c1114c1eeffbd1a3f6ddc5d33e77564bfee2Daniel Dunbar#else 12855907d1274ce715b92d584e305e0708e333a33c0Benjamin Kramer#define LLVM_LIKELY(EXPR) (EXPR) 12955907d1274ce715b92d584e305e0708e333a33c0Benjamin Kramer#define LLVM_UNLIKELY(EXPR) (EXPR) 130b372c1114c1eeffbd1a3f6ddc5d33e77564bfee2Daniel Dunbar#endif 131b372c1114c1eeffbd1a3f6ddc5d33e77564bfee2Daniel Dunbar 132ec381a4183f70122305f810c6b11b8f0e3bf83c0Nick Lewycky 1330c0cc92762bdf34f26762eeaf66f6f8791428db5Chris Lattner// C++ doesn't support 'extern template' of template specializations. GCC does, 1340c0cc92762bdf34f26762eeaf66f6f8791428db5Chris Lattner// but requires __extension__ before it. In the header, use this: 1350c0cc92762bdf34f26762eeaf66f6f8791428db5Chris Lattner// EXTERN_TEMPLATE_INSTANTIATION(class foo<bar>); 1360c0cc92762bdf34f26762eeaf66f6f8791428db5Chris Lattner// in the .cpp file, use this: 1370c0cc92762bdf34f26762eeaf66f6f8791428db5Chris Lattner// TEMPLATE_INSTANTIATION(class foo<bar>); 1380c0cc92762bdf34f26762eeaf66f6f8791428db5Chris Lattner#ifdef __GNUC__ 1390c0cc92762bdf34f26762eeaf66f6f8791428db5Chris Lattner#define EXTERN_TEMPLATE_INSTANTIATION(X) __extension__ extern template X 1400c0cc92762bdf34f26762eeaf66f6f8791428db5Chris Lattner#define TEMPLATE_INSTANTIATION(X) template X 1410c0cc92762bdf34f26762eeaf66f6f8791428db5Chris Lattner#else 1420c0cc92762bdf34f26762eeaf66f6f8791428db5Chris Lattner#define EXTERN_TEMPLATE_INSTANTIATION(X) 1430c0cc92762bdf34f26762eeaf66f6f8791428db5Chris Lattner#define TEMPLATE_INSTANTIATION(X) 1440c0cc92762bdf34f26762eeaf66f6f8791428db5Chris Lattner#endif 1450c0cc92762bdf34f26762eeaf66f6f8791428db5Chris Lattner 14619e57025d458d3cb50804fd821fd89b868a819bdChandler Carruth// LLVM_ATTRIBUTE_NOINLINE - On compilers where we have a directive to do so, 14719e57025d458d3cb50804fd821fd89b868a819bdChandler Carruth// mark a method "not for inlining". 1486f3241dbbf6926a1ad1d0e2f1e50e6228a55b258Chris Lattner#if (__GNUC__ > 3 || (__GNUC__ == 3 && __GNUC_MINOR__ >= 4)) 14919e57025d458d3cb50804fd821fd89b868a819bdChandler Carruth#define LLVM_ATTRIBUTE_NOINLINE __attribute__((noinline)) 150f2a39bd24fe72481fa8fa612f3494efd41a8e001Benjamin Kramer#elif defined(_MSC_VER) 15119e57025d458d3cb50804fd821fd89b868a819bdChandler Carruth#define LLVM_ATTRIBUTE_NOINLINE __declspec(noinline) 1526f3241dbbf6926a1ad1d0e2f1e50e6228a55b258Chris Lattner#else 15319e57025d458d3cb50804fd821fd89b868a819bdChandler Carruth#define LLVM_ATTRIBUTE_NOINLINE 1546f3241dbbf6926a1ad1d0e2f1e50e6228a55b258Chris Lattner#endif 1556f3241dbbf6926a1ad1d0e2f1e50e6228a55b258Chris Lattner 15619e57025d458d3cb50804fd821fd89b868a819bdChandler Carruth// LLVM_ATTRIBUTE_ALWAYS_INLINE - On compilers where we have a directive to do 15719e57025d458d3cb50804fd821fd89b868a819bdChandler Carruth// so, mark a method "always inline" because it is performance sensitive. GCC 15819e57025d458d3cb50804fd821fd89b868a819bdChandler Carruth// 3.4 supported this but is buggy in various cases and produces unimplemented 15919e57025d458d3cb50804fd821fd89b868a819bdChandler Carruth// errors, just use it in GCC 4.0 and later. 16014c85cbf541ec8940127474c20d8f1b5d5706bfeChris Lattner#if __GNUC__ > 3 161428ff6a6445ac1a0d263776cb0301f77f1454286Galina Kistanova#define LLVM_ATTRIBUTE_ALWAYS_INLINE inline __attribute__((always_inline)) 162a0b991be3f2a15a8358d94c6b9773568ec74e8f0Michael J. Spencer#elif defined(_MSC_VER) 16319e57025d458d3cb50804fd821fd89b868a819bdChandler Carruth#define LLVM_ATTRIBUTE_ALWAYS_INLINE __forceinline 16496c7ae5e978750380360fcb3f6e47876be337c31Chris Lattner#else 16519e57025d458d3cb50804fd821fd89b868a819bdChandler Carruth#define LLVM_ATTRIBUTE_ALWAYS_INLINE 16696c7ae5e978750380360fcb3f6e47876be337c31Chris Lattner#endif 16796c7ae5e978750380360fcb3f6e47876be337c31Chris Lattner 16896c7ae5e978750380360fcb3f6e47876be337c31Chris Lattner 16931e2466f159a887fed9139067a676f65adf2a8c3Torok Edwin#ifdef __GNUC__ 17019e57025d458d3cb50804fd821fd89b868a819bdChandler Carruth#define LLVM_ATTRIBUTE_NORETURN __attribute__((noreturn)) 1717b068610eb68ae02c1c92a98d4a3749c7cb6456cBenjamin Kramer#elif defined(_MSC_VER) 17219e57025d458d3cb50804fd821fd89b868a819bdChandler Carruth#define LLVM_ATTRIBUTE_NORETURN __declspec(noreturn) 17331e2466f159a887fed9139067a676f65adf2a8c3Torok Edwin#else 17419e57025d458d3cb50804fd821fd89b868a819bdChandler Carruth#define LLVM_ATTRIBUTE_NORETURN 17531e2466f159a887fed9139067a676f65adf2a8c3Torok Edwin#endif 17631e2466f159a887fed9139067a676f65adf2a8c3Torok Edwin 1778f4a17214c75e8ce3f2f88a2e3cd3300faba5fc6Daniel Dunbar// LLVM_EXTENSION - Support compilers where we have a keyword to suppress 1788f4a17214c75e8ce3f2f88a2e3cd3300faba5fc6Daniel Dunbar// pedantic diagnostics. 1798f4a17214c75e8ce3f2f88a2e3cd3300faba5fc6Daniel Dunbar#ifdef __GNUC__ 1808f4a17214c75e8ce3f2f88a2e3cd3300faba5fc6Daniel Dunbar#define LLVM_EXTENSION __extension__ 1818f4a17214c75e8ce3f2f88a2e3cd3300faba5fc6Daniel Dunbar#else 1828f4a17214c75e8ce3f2f88a2e3cd3300faba5fc6Daniel Dunbar#define LLVM_EXTENSION 1838f4a17214c75e8ce3f2f88a2e3cd3300faba5fc6Daniel Dunbar#endif 1848f4a17214c75e8ce3f2f88a2e3cd3300faba5fc6Daniel Dunbar 185965841cfe4de695fc56cab4821fd7e032ff85b83Michael J. Spencer// LLVM_ATTRIBUTE_DEPRECATED(decl, "message") 186965841cfe4de695fc56cab4821fd7e032ff85b83Michael J. Spencer#if __has_feature(attribute_deprecated_with_message) 187965841cfe4de695fc56cab4821fd7e032ff85b83Michael J. Spencer# define LLVM_ATTRIBUTE_DEPRECATED(decl, message) \ 188965841cfe4de695fc56cab4821fd7e032ff85b83Michael J. Spencer decl __attribute__((deprecated(message))) 189965841cfe4de695fc56cab4821fd7e032ff85b83Michael J. Spencer#elif defined(__GNUC__) 190965841cfe4de695fc56cab4821fd7e032ff85b83Michael J. Spencer# define LLVM_ATTRIBUTE_DEPRECATED(decl, message) \ 191965841cfe4de695fc56cab4821fd7e032ff85b83Michael J. Spencer decl __attribute__((deprecated)) 192965841cfe4de695fc56cab4821fd7e032ff85b83Michael J. Spencer#elif defined(_MSC_VER) 193965841cfe4de695fc56cab4821fd7e032ff85b83Michael J. Spencer# define LLVM_ATTRIBUTE_DEPRECATED(decl, message) \ 194965841cfe4de695fc56cab4821fd7e032ff85b83Michael J. Spencer __declspec(deprecated(message)) decl 195965841cfe4de695fc56cab4821fd7e032ff85b83Michael J. Spencer#else 196965841cfe4de695fc56cab4821fd7e032ff85b83Michael J. Spencer# define LLVM_ATTRIBUTE_DEPRECATED(decl, message) \ 197965841cfe4de695fc56cab4821fd7e032ff85b83Michael J. Spencer decl 198965841cfe4de695fc56cab4821fd7e032ff85b83Michael J. Spencer#endif 199965841cfe4de695fc56cab4821fd7e032ff85b83Michael J. Spencer 2002f9a9ed785416a7350f30141fcc405b69a1b9d5dJohn McCall// LLVM_BUILTIN_UNREACHABLE - On compilers which support it, expands 2012f9a9ed785416a7350f30141fcc405b69a1b9d5dJohn McCall// to an expression which states that it is undefined behavior for the 202b121bfcc22660b1bdfb1183b191b6516988bcaf5John McCall// compiler to reach this point. Otherwise is not defined. 2032f9a9ed785416a7350f30141fcc405b69a1b9d5dJohn McCall#if defined(__clang__) || (__GNUC__ > 4) \ 2042f9a9ed785416a7350f30141fcc405b69a1b9d5dJohn McCall || (__GNUC__ == 4 && __GNUC_MINOR__ >= 5) 2052f9a9ed785416a7350f30141fcc405b69a1b9d5dJohn McCall# define LLVM_BUILTIN_UNREACHABLE __builtin_unreachable() 2062f9a9ed785416a7350f30141fcc405b69a1b9d5dJohn McCall#endif 2072f9a9ed785416a7350f30141fcc405b69a1b9d5dJohn McCall 20874169b293f2fc8767db3c659fde6b001b7d5075fDavid Blaikie// LLVM_BUILTIN_TRAP - On compilers which support it, expands to an expression 20974169b293f2fc8767db3c659fde6b001b7d5075fDavid Blaikie// which causes the program to exit abnormally. 21074169b293f2fc8767db3c659fde6b001b7d5075fDavid Blaikie#if defined(__clang__) || (__GNUC__ > 4) \ 21174169b293f2fc8767db3c659fde6b001b7d5075fDavid Blaikie || (__GNUC__ == 4 && __GNUC_MINOR__ >= 3) 21274169b293f2fc8767db3c659fde6b001b7d5075fDavid Blaikie# define LLVM_BUILTIN_TRAP __builtin_trap() 21374169b293f2fc8767db3c659fde6b001b7d5075fDavid Blaikie#else 21474169b293f2fc8767db3c659fde6b001b7d5075fDavid Blaikie# define LLVM_BUILTIN_TRAP *(volatile int*)0x11 = 0 21574169b293f2fc8767db3c659fde6b001b7d5075fDavid Blaikie#endif 21674169b293f2fc8767db3c659fde6b001b7d5075fDavid Blaikie 2170c0cc92762bdf34f26762eeaf66f6f8791428db5Chris Lattner#endif 218