14c95e0c8b
On AIX, when accessing mmap'ed memory associated to a file on NFS, a
SIGBUS might be raised at random.
The problem is still in open state with the OS team.
This PR teaches the profile runtime, under certain conditions, to avoid
the mmap when reading the profile file during online merging.
This PR has no effect on any platform other than AIX because I'm not
aware of this problem on other platforms.
Other platforms can easily opt-in to this functionality in the future.
The logic in function `is_local_filesystem` was copied from
[llvm/lib/Support/Unix/Path.inc](f388ca3d9d/llvm/lib/Support/Unix/Path.inc (L515))
(https://reviews.llvm.org/D58801), because it seems that the
compiler-rt/profile cannot reuse code from llvm except through
`InstrProfData.inc`.
Thanks to @hubert-reinterpretcast for substantial feedback downstream.
---------
Co-authored-by: Wael Yehia <wyehia@ca.ibm.com>
Co-authored-by: Hubert Tong <hubert.reinterpretcast@gmail.com>
155 lines
5.3 KiB
C
155 lines
5.3 KiB
C
/*===- InstrProfilingPort.h- Support library for PGO instrumentation ------===*\
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|*
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|* Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
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|* See https://llvm.org/LICENSE.txt for license information.
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|* SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
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|*
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\*===----------------------------------------------------------------------===*/
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/* This header must be included after all others so it can provide fallback
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definitions for stuff missing in system headers. */
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#ifndef PROFILE_INSTRPROFILING_PORT_H_
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#define PROFILE_INSTRPROFILING_PORT_H_
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#ifdef _MSC_VER
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#define COMPILER_RT_ALIGNAS(x) __declspec(align(x))
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#define COMPILER_RT_VISIBILITY
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/* FIXME: selectany does not have the same semantics as weak. */
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#define COMPILER_RT_WEAK __declspec(selectany)
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/* Need to include <windows.h> */
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#define COMPILER_RT_ALLOCA _alloca
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/* Need to include <stdio.h> and <io.h> */
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#define COMPILER_RT_FTRUNCATE(f,l) _chsize(_fileno(f),l)
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#define COMPILER_RT_ALWAYS_INLINE __forceinline
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#define COMPILER_RT_CLEANUP(x)
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#define COMPILER_RT_UNUSED
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#define COMPILER_RT_USED
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#elif __GNUC__
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#ifdef _WIN32
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#define COMPILER_RT_FTRUNCATE(f, l) _chsize(fileno(f), l)
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#define COMPILER_RT_VISIBILITY
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#define COMPILER_RT_WEAK __attribute__((selectany))
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#else
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#define COMPILER_RT_FTRUNCATE(f, l) ftruncate(fileno(f), l)
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#define COMPILER_RT_VISIBILITY __attribute__((visibility("hidden")))
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#define COMPILER_RT_WEAK __attribute__((weak))
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#endif
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#define COMPILER_RT_ALIGNAS(x) __attribute__((aligned(x)))
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#define COMPILER_RT_ALLOCA __builtin_alloca
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#define COMPILER_RT_ALWAYS_INLINE inline __attribute((always_inline))
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#define COMPILER_RT_CLEANUP(x) __attribute__((cleanup(x)))
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#define COMPILER_RT_UNUSED __attribute__((unused))
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#define COMPILER_RT_USED __attribute__((used))
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#endif
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#if defined(__APPLE__)
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#define COMPILER_RT_SEG "__DATA,"
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#else
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#define COMPILER_RT_SEG ""
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#endif
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#ifdef _MSC_VER
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#define COMPILER_RT_SECTION(Sect) __declspec(allocate(Sect))
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#else
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#define COMPILER_RT_SECTION(Sect) __attribute__((section(Sect)))
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#endif
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#define COMPILER_RT_MAX_HOSTLEN 128
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#if defined(__ORBIS__) || defined(__wasi__)
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#define COMPILER_RT_GETHOSTNAME(Name, Len) ((void)(Name), (void)(Len), (-1))
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#else
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#define COMPILER_RT_GETHOSTNAME(Name, Len) lprofGetHostName(Name, Len)
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#endif
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#if COMPILER_RT_HAS_ATOMICS == 1
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#ifdef _WIN32
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#include <windows.h>
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#if defined(_MSC_VER) && _MSC_VER < 1900
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#define snprintf _snprintf
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#endif
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#if defined(_WIN64)
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#define COMPILER_RT_BOOL_CMPXCHG(Ptr, OldV, NewV) \
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(InterlockedCompareExchange64((LONGLONG volatile *)Ptr, (LONGLONG)NewV, \
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(LONGLONG)OldV) == (LONGLONG)OldV)
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#define COMPILER_RT_PTR_FETCH_ADD(DomType, PtrVar, PtrIncr) \
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(DomType *)InterlockedExchangeAdd64((LONGLONG volatile *)&PtrVar, \
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(LONGLONG)sizeof(DomType) * PtrIncr)
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#else /* !defined(_WIN64) */
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#define COMPILER_RT_BOOL_CMPXCHG(Ptr, OldV, NewV) \
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(InterlockedCompareExchange((LONG volatile *)Ptr, (LONG)NewV, (LONG)OldV) == \
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(LONG)OldV)
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#define COMPILER_RT_PTR_FETCH_ADD(DomType, PtrVar, PtrIncr) \
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(DomType *)InterlockedExchangeAdd((LONG volatile *)&PtrVar, \
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(LONG)sizeof(DomType) * PtrIncr)
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#endif
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#else /* !defined(_WIN32) */
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#define COMPILER_RT_BOOL_CMPXCHG(Ptr, OldV, NewV) \
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__sync_bool_compare_and_swap(Ptr, OldV, NewV)
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#define COMPILER_RT_PTR_FETCH_ADD(DomType, PtrVar, PtrIncr) \
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(DomType *)__sync_fetch_and_add((long *)&PtrVar, sizeof(DomType) * PtrIncr)
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#endif
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#else /* COMPILER_RT_HAS_ATOMICS != 1 */
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#include "InstrProfilingUtil.h"
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#define COMPILER_RT_BOOL_CMPXCHG(Ptr, OldV, NewV) \
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lprofBoolCmpXchg((void **)Ptr, OldV, NewV)
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#define COMPILER_RT_PTR_FETCH_ADD(DomType, PtrVar, PtrIncr) \
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(DomType *)lprofPtrFetchAdd((void **)&PtrVar, sizeof(DomType) * PtrIncr)
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#endif
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#if defined(_WIN32)
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#define DIR_SEPARATOR '\\'
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#define DIR_SEPARATOR_2 '/'
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#else
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#define DIR_SEPARATOR '/'
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#endif
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#ifndef DIR_SEPARATOR_2
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#define IS_DIR_SEPARATOR(ch) ((ch) == DIR_SEPARATOR)
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#else /* DIR_SEPARATOR_2 */
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#define IS_DIR_SEPARATOR(ch) \
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(((ch) == DIR_SEPARATOR) || ((ch) == DIR_SEPARATOR_2))
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#endif /* DIR_SEPARATOR_2 */
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#if defined(_WIN32)
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#include <windows.h>
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static inline size_t getpagesize(void) {
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SYSTEM_INFO S;
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GetNativeSystemInfo(&S);
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return S.dwPageSize;
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}
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#else /* defined(_WIN32) */
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#include <unistd.h>
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#endif /* defined(_WIN32) */
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#define PROF_ERR(Format, ...) \
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fprintf(stderr, "LLVM Profile Error: " Format, __VA_ARGS__);
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#define PROF_WARN(Format, ...) \
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fprintf(stderr, "LLVM Profile Warning: " Format, __VA_ARGS__);
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#define PROF_NOTE(Format, ...) \
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fprintf(stderr, "LLVM Profile Note: " Format, __VA_ARGS__);
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#ifndef MAP_FILE
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#define MAP_FILE 0
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#endif
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#ifndef O_BINARY
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#define O_BINARY 0
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#endif
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#if defined(__FreeBSD__)
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#include <inttypes.h>
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#include <sys/types.h>
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#else /* defined(__FreeBSD__) */
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#include <inttypes.h>
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#include <stdint.h>
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#endif /* defined(__FreeBSD__) && defined(__i386__) */
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#endif /* PROFILE_INSTRPROFILING_PORT_H_ */
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