1//===-- llvm/Support/Compiler.h - Compiler abstraction support --*- 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 defines several macros, based on the current compiler. This allows
10// use of compiler-specific features in a way that remains portable. This header
11// can be included from either C or C++.
12//
13//===----------------------------------------------------------------------===//
14
15#ifndef LLVM_SUPPORT_COMPILER_H
16#define LLVM_SUPPORT_COMPILER_H
17
18#include "llvm/Config/llvm-config.h"
19
20#include <stddef.h>
21
22#if defined(_MSC_VER)
23#include <sal.h>
24#endif
25
26#ifndef __has_feature
27# define __has_feature(x) 0
28#endif
29
30#ifndef __has_extension
31# define __has_extension(x) 0
32#endif
33
34#ifndef __has_attribute
35# define __has_attribute(x) 0
36#endif
37
38#ifndef __has_builtin
39# define __has_builtin(x) 0
40#endif
41
42#ifndef __has_include
43# define __has_include(x) 0
44#endif
45
46// Only use __has_cpp_attribute in C++ mode. GCC defines __has_cpp_attribute in
47// C mode, but the :: in __has_cpp_attribute(scoped::attribute) is invalid.
48#ifndef LLVM_HAS_CPP_ATTRIBUTE
49#if defined(__cplusplus) && defined(__has_cpp_attribute)
50# define LLVM_HAS_CPP_ATTRIBUTE(x) __has_cpp_attribute(x)
51#else
52# define LLVM_HAS_CPP_ATTRIBUTE(x) 0
53#endif
54#endif
55
56/// \macro LLVM_GNUC_PREREQ
57/// Extend the default __GNUC_PREREQ even if glibc's features.h isn't
58/// available.
59#ifndef LLVM_GNUC_PREREQ
60# if defined(__GNUC__) && defined(__GNUC_MINOR__) && defined(__GNUC_PATCHLEVEL__)
61# define LLVM_GNUC_PREREQ(maj, min, patch) \
62 ((__GNUC__ << 20) + (__GNUC_MINOR__ << 10) + __GNUC_PATCHLEVEL__ >= \
63 ((maj) << 20) + ((min) << 10) + (patch))
64# elif defined(__GNUC__) && defined(__GNUC_MINOR__)
65# define LLVM_GNUC_PREREQ(maj, min, patch) \
66 ((__GNUC__ << 20) + (__GNUC_MINOR__ << 10) >= ((maj) << 20) + ((min) << 10))
67# else
68# define LLVM_GNUC_PREREQ(maj, min, patch) 0
69# endif
70#endif
71
72/// \macro LLVM_MSC_PREREQ
73/// Is the compiler MSVC of at least the specified version?
74/// The common \param version values to check for are:
75/// * 1910: VS2017, version 15.1 & 15.2
76/// * 1911: VS2017, version 15.3 & 15.4
77/// * 1912: VS2017, version 15.5
78/// * 1913: VS2017, version 15.6
79/// * 1914: VS2017, version 15.7
80/// * 1915: VS2017, version 15.8
81/// * 1916: VS2017, version 15.9
82/// * 1920: VS2019, version 16.0
83/// * 1921: VS2019, version 16.1
84/// * 1922: VS2019, version 16.2
85/// * 1923: VS2019, version 16.3
86/// * 1924: VS2019, version 16.4
87/// * 1925: VS2019, version 16.5
88/// * 1926: VS2019, version 16.6
89/// * 1927: VS2019, version 16.7
90/// * 1928: VS2019, version 16.8 + 16.9
91/// * 1929: VS2019, version 16.10 + 16.11
92/// * 1930: VS2022, version 17.0
93#ifdef _MSC_VER
94#define LLVM_MSC_PREREQ(version) (_MSC_VER >= (version))
95
96// We require at least VS 2019.
97#if !defined(LLVM_FORCE_USE_OLD_TOOLCHAIN)
98#if !LLVM_MSC_PREREQ(1920)
99#error LLVM requires at least VS 2019.
100#endif
101#endif
102
103#else
104#define LLVM_MSC_PREREQ(version) 0
105#endif
106
107/// LLVM_LIBRARY_VISIBILITY - If a class marked with this attribute is linked
108/// into a shared library, then the class should be private to the library and
109/// not accessible from outside it. Can also be used to mark variables and
110/// functions, making them private to any shared library they are linked into.
111/// On PE/COFF targets, library visibility is the default, so this isn't needed.
112///
113/// LLVM_EXTERNAL_VISIBILITY - classes, functions, and variables marked with
114/// this attribute will be made public and visible outside of any shared library
115/// they are linked in to.
116
117#if LLVM_HAS_CPP_ATTRIBUTE(gnu::visibility)
118#define LLVM_ATTRIBUTE_VISIBILITY_HIDDEN [[gnu::visibility("hidden")]]
119#define LLVM_ATTRIBUTE_VISIBILITY_DEFAULT [[gnu::visibility("default")]]
120#elif __has_attribute(visibility)
121#define LLVM_ATTRIBUTE_VISIBILITY_HIDDEN __attribute__((visibility("hidden")))
122#define LLVM_ATTRIBUTE_VISIBILITY_DEFAULT __attribute__((visibility("default")))
123#else
124#define LLVM_ATTRIBUTE_VISIBILITY_HIDDEN
125#define LLVM_ATTRIBUTE_VISIBILITY_DEFAULT
126#endif
127
128
129#if (!(defined(_WIN32) || defined(__CYGWIN__)) || \
130 (defined(__MINGW32__) && defined(__clang__)))
131#define LLVM_LIBRARY_VISIBILITY LLVM_ATTRIBUTE_VISIBILITY_HIDDEN
132#if defined(LLVM_BUILD_LLVM_DYLIB) || defined(LLVM_BUILD_SHARED_LIBS)
133#define LLVM_EXTERNAL_VISIBILITY LLVM_ATTRIBUTE_VISIBILITY_DEFAULT
134#else
135#define LLVM_EXTERNAL_VISIBILITY
136#endif
137#else
138#define LLVM_LIBRARY_VISIBILITY
139#define LLVM_EXTERNAL_VISIBILITY
140#endif
141
142#if defined(__GNUC__)
143#define LLVM_PREFETCH(addr, rw, locality) __builtin_prefetch(addr, rw, locality)
144#else
145#define LLVM_PREFETCH(addr, rw, locality)
146#endif
147
148#if __has_attribute(used)
149#define LLVM_ATTRIBUTE_USED __attribute__((__used__))
150#else
151#define LLVM_ATTRIBUTE_USED
152#endif
153
154#if defined(__clang__)
155#define LLVM_DEPRECATED(MSG, FIX) __attribute__((deprecated(MSG, FIX)))
156#else
157#define LLVM_DEPRECATED(MSG, FIX) [[deprecated(MSG)]]
158#endif
159
160// Indicate that a non-static, non-const C++ member function reinitializes
161// the entire object to a known state, independent of the previous state of
162// the object.
163//
164// The clang-tidy check bugprone-use-after-move recognizes this attribute as a
165// marker that a moved-from object has left the indeterminate state and can be
166// reused.
167#if LLVM_HAS_CPP_ATTRIBUTE(clang::reinitializes)
168#define LLVM_ATTRIBUTE_REINITIALIZES [[clang::reinitializes]]
169#else
170#define LLVM_ATTRIBUTE_REINITIALIZES
171#endif
172
173// Some compilers warn about unused functions. When a function is sometimes
174// used or not depending on build settings (e.g. a function only called from
175// within "assert"), this attribute can be used to suppress such warnings.
176//
177// However, it shouldn't be used for unused *variables*, as those have a much
178// more portable solution:
179// (void)unused_var_name;
180// Prefer cast-to-void wherever it is sufficient.
181#if __has_attribute(unused)
182#define LLVM_ATTRIBUTE_UNUSED __attribute__((__unused__))
183#else
184#define LLVM_ATTRIBUTE_UNUSED
185#endif
186
187// FIXME: Provide this for PE/COFF targets.
188#if __has_attribute(weak) && !defined(__MINGW32__) && !defined(__CYGWIN__) && \
189 !defined(_WIN32)
190#define LLVM_ATTRIBUTE_WEAK __attribute__((__weak__))
191#else
192#define LLVM_ATTRIBUTE_WEAK
193#endif
194
195// Prior to clang 3.2, clang did not accept any spelling of
196// __has_attribute(const), so assume it is supported.
197#if defined(__clang__) || defined(__GNUC__)
198// aka 'CONST' but following LLVM Conventions.
199#define LLVM_READNONE __attribute__((__const__))
200#else
201#define LLVM_READNONE
202#endif
203
204#if __has_attribute(pure) || defined(__GNUC__)
205// aka 'PURE' but following LLVM Conventions.
206#define LLVM_READONLY __attribute__((__pure__))
207#else
208#define LLVM_READONLY
209#endif
210
211#if __has_attribute(minsize)
212#define LLVM_ATTRIBUTE_MINSIZE __attribute__((minsize))
213#else
214#define LLVM_ATTRIBUTE_MINSIZE
215#endif
216
217#if __has_builtin(__builtin_expect) || defined(__GNUC__)
218#define LLVM_LIKELY(EXPR) __builtin_expect((bool)(EXPR), true)
219#define LLVM_UNLIKELY(EXPR) __builtin_expect((bool)(EXPR), false)
220#else
221#define LLVM_LIKELY(EXPR) (EXPR)
222#define LLVM_UNLIKELY(EXPR) (EXPR)
223#endif
224
225/// LLVM_ATTRIBUTE_NOINLINE - On compilers where we have a directive to do so,
226/// mark a method "not for inlining".
227#if __has_attribute(noinline)
228#define LLVM_ATTRIBUTE_NOINLINE __attribute__((noinline))
229#elif defined(_MSC_VER)
230#define LLVM_ATTRIBUTE_NOINLINE __declspec(noinline)
231#else
232#define LLVM_ATTRIBUTE_NOINLINE
233#endif
234
235/// LLVM_ATTRIBUTE_ALWAYS_INLINE - On compilers where we have a directive to do
236/// so, mark a method "always inline" because it is performance sensitive.
237#if __has_attribute(always_inline)
238#define LLVM_ATTRIBUTE_ALWAYS_INLINE inline __attribute__((always_inline))
239#elif defined(_MSC_VER)
240#define LLVM_ATTRIBUTE_ALWAYS_INLINE __forceinline
241#else
242#define LLVM_ATTRIBUTE_ALWAYS_INLINE inline
243#endif
244
245/// LLVM_ATTRIBUTE_NO_DEBUG - On compilers where we have a directive to do
246/// so, mark a method "no debug" because debug info makes the debugger
247/// experience worse.
248#if __has_attribute(nodebug)
249#define LLVM_ATTRIBUTE_NODEBUG __attribute__((nodebug))
250#else
251#define LLVM_ATTRIBUTE_NODEBUG
252#endif
253
254#if __has_attribute(returns_nonnull)
255#define LLVM_ATTRIBUTE_RETURNS_NONNULL __attribute__((returns_nonnull))
256#elif defined(_MSC_VER)
257#define LLVM_ATTRIBUTE_RETURNS_NONNULL _Ret_notnull_
258#else
259#define LLVM_ATTRIBUTE_RETURNS_NONNULL
260#endif
261
262/// \macro LLVM_ATTRIBUTE_RETURNS_NOALIAS Used to mark a function as returning a
263/// pointer that does not alias any other valid pointer.
264#ifdef __GNUC__
265#define LLVM_ATTRIBUTE_RETURNS_NOALIAS __attribute__((__malloc__))
266#elif defined(_MSC_VER)
267#define LLVM_ATTRIBUTE_RETURNS_NOALIAS __declspec(restrict)
268#else
269#define LLVM_ATTRIBUTE_RETURNS_NOALIAS
270#endif
271
272/// LLVM_FALLTHROUGH - Mark fallthrough cases in switch statements.
273#if defined(__cplusplus) && __cplusplus > 201402L && LLVM_HAS_CPP_ATTRIBUTE(fallthrough)
274#define LLVM_FALLTHROUGH [[fallthrough]]
275#elif LLVM_HAS_CPP_ATTRIBUTE(gnu::fallthrough)
276#define LLVM_FALLTHROUGH [[gnu::fallthrough]]
277#elif __has_attribute(fallthrough)
278#define LLVM_FALLTHROUGH __attribute__((fallthrough))
279#elif LLVM_HAS_CPP_ATTRIBUTE(clang::fallthrough)
280#define LLVM_FALLTHROUGH [[clang::fallthrough]]
281#else
282#define LLVM_FALLTHROUGH
283#endif
284
285/// LLVM_REQUIRE_CONSTANT_INITIALIZATION - Apply this to globals to ensure that
286/// they are constant initialized.
287#if LLVM_HAS_CPP_ATTRIBUTE(clang::require_constant_initialization)
288#define LLVM_REQUIRE_CONSTANT_INITIALIZATION \
289 [[clang::require_constant_initialization]]
290#else
291#define LLVM_REQUIRE_CONSTANT_INITIALIZATION
292#endif
293
294/// LLVM_GSL_OWNER - Apply this to owning classes like SmallVector to enable
295/// lifetime warnings.
296#if LLVM_HAS_CPP_ATTRIBUTE(gsl::Owner)
297#define LLVM_GSL_OWNER [[gsl::Owner]]
298#else
299#define LLVM_GSL_OWNER
300#endif
301
302/// LLVM_GSL_POINTER - Apply this to non-owning classes like
303/// StringRef to enable lifetime warnings.
304#if LLVM_HAS_CPP_ATTRIBUTE(gsl::Pointer)
305#define LLVM_GSL_POINTER [[gsl::Pointer]]
306#else
307#define LLVM_GSL_POINTER
308#endif
309
310/// LLVM_EXTENSION - Support compilers where we have a keyword to suppress
311/// pedantic diagnostics.
312#ifdef __GNUC__
313#define LLVM_EXTENSION __extension__
314#else
315#define LLVM_EXTENSION
316#endif
317
318/// LLVM_BUILTIN_UNREACHABLE - On compilers which support it, expands
319/// to an expression which states that it is undefined behavior for the
320/// compiler to reach this point. Otherwise is not defined.
321///
322/// '#else' is intentionally left out so that other macro logic (e.g.,
323/// LLVM_ASSUME_ALIGNED and llvm_unreachable()) can detect whether
324/// LLVM_BUILTIN_UNREACHABLE has a definition.
325#if __has_builtin(__builtin_unreachable) || defined(__GNUC__)
326# define LLVM_BUILTIN_UNREACHABLE __builtin_unreachable()
327#elif defined(_MSC_VER)
328# define LLVM_BUILTIN_UNREACHABLE __assume(false)
329#endif
330
331/// LLVM_BUILTIN_TRAP - On compilers which support it, expands to an expression
332/// which causes the program to exit abnormally.
333#if __has_builtin(__builtin_trap) || defined(__GNUC__)
334# define LLVM_BUILTIN_TRAP __builtin_trap()
335#elif defined(_MSC_VER)
336// The __debugbreak intrinsic is supported by MSVC, does not require forward
337// declarations involving platform-specific typedefs (unlike RaiseException),
338// results in a call to vectored exception handlers, and encodes to a short
339// instruction that still causes the trapping behavior we want.
340# define LLVM_BUILTIN_TRAP __debugbreak()
341#else
342# define LLVM_BUILTIN_TRAP *(volatile int*)0x11 = 0
343#endif
344
345/// LLVM_BUILTIN_DEBUGTRAP - On compilers which support it, expands to
346/// an expression which causes the program to break while running
347/// under a debugger.
348#if __has_builtin(__builtin_debugtrap)
349# define LLVM_BUILTIN_DEBUGTRAP __builtin_debugtrap()
350#elif defined(_MSC_VER)
351// The __debugbreak intrinsic is supported by MSVC and breaks while
352// running under the debugger, and also supports invoking a debugger
353// when the OS is configured appropriately.
354# define LLVM_BUILTIN_DEBUGTRAP __debugbreak()
355#else
356// Just continue execution when built with compilers that have no
357// support. This is a debugging aid and not intended to force the
358// program to abort if encountered.
359# define LLVM_BUILTIN_DEBUGTRAP
360#endif
361
362/// \macro LLVM_ASSUME_ALIGNED
363/// Returns a pointer with an assumed alignment.
364#if __has_builtin(__builtin_assume_aligned) || defined(__GNUC__)
365# define LLVM_ASSUME_ALIGNED(p, a) __builtin_assume_aligned(p, a)
366#elif defined(LLVM_BUILTIN_UNREACHABLE)
367# define LLVM_ASSUME_ALIGNED(p, a) \
368 (((uintptr_t(p) % (a)) == 0) ? (p) : (LLVM_BUILTIN_UNREACHABLE, (p)))
369#else
370# define LLVM_ASSUME_ALIGNED(p, a) (p)
371#endif
372
373/// \macro LLVM_PACKED
374/// Used to specify a packed structure.
375/// LLVM_PACKED(
376/// struct A {
377/// int i;
378/// int j;
379/// int k;
380/// long long l;
381/// });
382///
383/// LLVM_PACKED_START
384/// struct B {
385/// int i;
386/// int j;
387/// int k;
388/// long long l;
389/// };
390/// LLVM_PACKED_END
391#ifdef _MSC_VER
392# define LLVM_PACKED(d) __pragma(pack(push, 1)) d __pragma(pack(pop))
393# define LLVM_PACKED_START __pragma(pack(push, 1))
394# define LLVM_PACKED_END __pragma(pack(pop))
395#else
396# define LLVM_PACKED(d) d __attribute__((packed))
397# define LLVM_PACKED_START _Pragma("pack(push, 1)")
398# define LLVM_PACKED_END _Pragma("pack(pop)")
399#endif
400
401/// \macro LLVM_MEMORY_SANITIZER_BUILD
402/// Whether LLVM itself is built with MemorySanitizer instrumentation.
403#if __has_feature(memory_sanitizer)
404# define LLVM_MEMORY_SANITIZER_BUILD 1
405# include <sanitizer/msan_interface.h>
406# define LLVM_NO_SANITIZE_MEMORY_ATTRIBUTE __attribute__((no_sanitize_memory))
407#else
408# define LLVM_MEMORY_SANITIZER_BUILD 0
409# define __msan_allocated_memory(p, size)
410# define __msan_unpoison(p, size)
411# define LLVM_NO_SANITIZE_MEMORY_ATTRIBUTE
412#endif
413
414/// \macro LLVM_ADDRESS_SANITIZER_BUILD
415/// Whether LLVM itself is built with AddressSanitizer instrumentation.
416#if __has_feature(address_sanitizer) || defined(__SANITIZE_ADDRESS__)
417# define LLVM_ADDRESS_SANITIZER_BUILD 1
418#if __has_include(<sanitizer/asan_interface.h>)
419# include <sanitizer/asan_interface.h>
420#else
421// These declarations exist to support ASan with MSVC. If MSVC eventually ships
422// asan_interface.h in their headers, then we can remove this.
423#ifdef __cplusplus
424extern "C" {
425#endif
426void __asan_poison_memory_region(void const volatile *addr, size_t size);
427void __asan_unpoison_memory_region(void const volatile *addr, size_t size);
428#ifdef __cplusplus
429} // extern "C"
430#endif
431#endif
432#else
433# define LLVM_ADDRESS_SANITIZER_BUILD 0
434# define __asan_poison_memory_region(p, size)
435# define __asan_unpoison_memory_region(p, size)
436#endif
437
438/// \macro LLVM_HWADDRESS_SANITIZER_BUILD
439/// Whether LLVM itself is built with HWAddressSanitizer instrumentation.
440#if __has_feature(hwaddress_sanitizer)
441#define LLVM_HWADDRESS_SANITIZER_BUILD 1
442#else
443#define LLVM_HWADDRESS_SANITIZER_BUILD 0
444#endif
445
446/// \macro LLVM_THREAD_SANITIZER_BUILD
447/// Whether LLVM itself is built with ThreadSanitizer instrumentation.
448#if __has_feature(thread_sanitizer) || defined(__SANITIZE_THREAD__)
449# define LLVM_THREAD_SANITIZER_BUILD 1
450#else
451# define LLVM_THREAD_SANITIZER_BUILD 0
452#endif
453
454#if LLVM_THREAD_SANITIZER_BUILD
455// Thread Sanitizer is a tool that finds races in code.
456// See http://code.google.com/p/data-race-test/wiki/DynamicAnnotations .
457// tsan detects these exact functions by name.
458#ifdef __cplusplus
459extern "C" {
460#endif
461void AnnotateHappensAfter(const char *file, int line, const volatile void *cv);
462void AnnotateHappensBefore(const char *file, int line, const volatile void *cv);
463void AnnotateIgnoreWritesBegin(const char *file, int line);
464void AnnotateIgnoreWritesEnd(const char *file, int line);
465#ifdef __cplusplus
466}
467#endif
468
469// This marker is used to define a happens-before arc. The race detector will
470// infer an arc from the begin to the end when they share the same pointer
471// argument.
472# define TsanHappensBefore(cv) AnnotateHappensBefore(__FILE__, __LINE__, cv)
473
474// This marker defines the destination of a happens-before arc.
475# define TsanHappensAfter(cv) AnnotateHappensAfter(__FILE__, __LINE__, cv)
476
477// Ignore any races on writes between here and the next TsanIgnoreWritesEnd.
478# define TsanIgnoreWritesBegin() AnnotateIgnoreWritesBegin(__FILE__, __LINE__)
479
480// Resume checking for racy writes.
481# define TsanIgnoreWritesEnd() AnnotateIgnoreWritesEnd(__FILE__, __LINE__)
482#else
483# define TsanHappensBefore(cv)
484# define TsanHappensAfter(cv)
485# define TsanIgnoreWritesBegin()
486# define TsanIgnoreWritesEnd()
487#endif
488
489/// \macro LLVM_NO_SANITIZE
490/// Disable a particular sanitizer for a function.
491#if __has_attribute(no_sanitize)
492#define LLVM_NO_SANITIZE(KIND) __attribute__((no_sanitize(KIND)))
493#else
494#define LLVM_NO_SANITIZE(KIND)
495#endif
496
497/// Mark debug helper function definitions like dump() that should not be
498/// stripped from debug builds.
499/// Note that you should also surround dump() functions with
500/// `#if !defined(NDEBUG) || defined(LLVM_ENABLE_DUMP)` so they do always
501/// get stripped in release builds.
502// FIXME: Move this to a private config.h as it's not usable in public headers.
503#if !defined(NDEBUG) || defined(LLVM_ENABLE_DUMP)
504#define LLVM_DUMP_METHOD LLVM_ATTRIBUTE_NOINLINE LLVM_ATTRIBUTE_USED
505#else
506#define LLVM_DUMP_METHOD LLVM_ATTRIBUTE_NOINLINE
507#endif
508
509/// \macro LLVM_PRETTY_FUNCTION
510/// Gets a user-friendly looking function signature for the current scope
511/// using the best available method on each platform. The exact format of the
512/// resulting string is implementation specific and non-portable, so this should
513/// only be used, for example, for logging or diagnostics.
514#if defined(_MSC_VER)
515#define LLVM_PRETTY_FUNCTION __FUNCSIG__
516#elif defined(__GNUC__) || defined(__clang__)
517#define LLVM_PRETTY_FUNCTION __PRETTY_FUNCTION__
518#else
519#define LLVM_PRETTY_FUNCTION __func__
520#endif
521
522/// \macro LLVM_THREAD_LOCAL
523/// A thread-local storage specifier which can be used with globals,
524/// extern globals, and static globals.
525///
526/// This is essentially an extremely restricted analog to C++11's thread_local
527/// support. It uses thread_local if available, falling back on gcc __thread
528/// if not. __thread doesn't support many of the C++11 thread_local's
529/// features. You should only use this for PODs that you can statically
530/// initialize to some constant value. In almost all circumstances this is most
531/// appropriate for use with a pointer, integer, or small aggregation of
532/// pointers and integers.
533#if LLVM_ENABLE_THREADS
534#if __has_feature(cxx_thread_local) || defined(_MSC_VER)
535#define LLVM_THREAD_LOCAL thread_local
536#else
537// Clang, GCC, and other compatible compilers used __thread prior to C++11 and
538// we only need the restricted functionality that provides.
539#define LLVM_THREAD_LOCAL __thread
540#endif
541#else // !LLVM_ENABLE_THREADS
542// If threading is disabled entirely, this compiles to nothing and you get
543// a normal global variable.
544#define LLVM_THREAD_LOCAL
545#endif
546
547/// \macro LLVM_ENABLE_EXCEPTIONS
548/// Whether LLVM is built with exception support.
549#if __has_feature(cxx_exceptions)
550#define LLVM_ENABLE_EXCEPTIONS 1
551#elif defined(__GNUC__) && defined(__EXCEPTIONS)
552#define LLVM_ENABLE_EXCEPTIONS 1
553#elif defined(_MSC_VER) && defined(_CPPUNWIND)
554#define LLVM_ENABLE_EXCEPTIONS 1
555#endif
556
557/// \macro LLVM_NO_PROFILE_INSTRUMENT_FUNCTION
558/// Disable the profile instrument for a function.
559#if __has_attribute(no_profile_instrument_function)
560#define LLVM_NO_PROFILE_INSTRUMENT_FUNCTION \
561 __attribute__((no_profile_instrument_function))
562#else
563#define LLVM_NO_PROFILE_INSTRUMENT_FUNCTION
564#endif
565
566#endif
567

source code of include/llvm-17/llvm/Support/Compiler.h