diff options
author | Diana Picus <diana.picus@linaro.org> | 2016-12-22 07:35:56 +0000 |
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committer | Diana Picus <diana.picus@linaro.org> | 2016-12-22 07:35:56 +0000 |
commit | f1243a1c875486f74130b22a8d5a3778d92427d0 (patch) | |
tree | 5d388e7049f7ce9ea54b64e1cbff9ff682c53df8 /lib/xray/xray_inmemory_log.cc | |
parent | f652bfabc12a5b03cab6edc71a11a60244ee5c1c (diff) |
[XRay] [compiler-rt] Move machine-dependent code into machine-dependent files
Reapply r290077.
Authors: pelikan
Differential Revision: https://reviews.llvm.org/D27979
git-svn-id: https://llvm.org/svn/llvm-project/compiler-rt/trunk@290330 91177308-0d34-0410-b5e6-96231b3b80d8
Diffstat (limited to 'lib/xray/xray_inmemory_log.cc')
-rw-r--r-- | lib/xray/xray_inmemory_log.cc | 185 |
1 files changed, 46 insertions, 139 deletions
diff --git a/lib/xray/xray_inmemory_log.cc b/lib/xray/xray_inmemory_log.cc index a93972df3..7ec56f486 100644 --- a/lib/xray/xray_inmemory_log.cc +++ b/lib/xray/xray_inmemory_log.cc @@ -16,6 +16,7 @@ //===----------------------------------------------------------------------===// #include <cassert> +#include <cstdint> #include <cstdio> #include <fcntl.h> #include <mutex> @@ -26,12 +27,12 @@ #include <unistd.h> #if defined(__x86_64__) -#include <x86intrin.h> +#include "xray_x86_64.h" #elif defined(__arm__) || defined(__aarch64__) -static const int64_t NanosecondsPerSecond = 1000LL * 1000 * 1000; +#include "xray_emulate_tsc.h" #else #error "Unsupported CPU Architecture" -#endif /* CPU architecture */ +#endif /* Architecture-specific inline intrinsics */ #include "sanitizer_common/sanitizer_libc.h" #include "xray/xray_records.h" @@ -71,52 +72,6 @@ static void retryingWriteAll(int Fd, char *Begin, } } -#if defined(__x86_64__) -static std::pair<ssize_t, bool> -retryingReadSome(int Fd, char *Begin, char *End) XRAY_NEVER_INSTRUMENT { - auto BytesToRead = std::distance(Begin, End); - ssize_t BytesRead; - ssize_t TotalBytesRead = 0; - while (BytesToRead && (BytesRead = read(Fd, Begin, BytesToRead))) { - if (BytesRead == -1) { - if (errno == EINTR) - continue; - Report("Read error; errno = %d\n", errno); - return std::make_pair(TotalBytesRead, false); - } - - TotalBytesRead += BytesRead; - BytesToRead -= BytesRead; - Begin += BytesRead; - } - return std::make_pair(TotalBytesRead, true); -} - -static bool readValueFromFile(const char *Filename, - long long *Value) XRAY_NEVER_INSTRUMENT { - int Fd = open(Filename, O_RDONLY | O_CLOEXEC); - if (Fd == -1) - return false; - static constexpr size_t BufSize = 256; - char Line[BufSize] = {}; - ssize_t BytesRead; - bool Success; - std::tie(BytesRead, Success) = retryingReadSome(Fd, Line, Line + BufSize); - if (!Success) - return false; - close(Fd); - char *End = nullptr; - long long Tmp = internal_simple_strtoll(Line, &End, 10); - bool Result = false; - if (Line[0] != '\0' && (*End == '\n' || *End == '\0')) { - *Value = Tmp; - Result = true; - } - return Result; -} - -#endif /* CPU architecture */ - class ThreadExitFlusher { int Fd; XRayRecord *Start; @@ -151,6 +106,46 @@ void PrintToStdErr(const char *Buffer) XRAY_NEVER_INSTRUMENT { fprintf(stderr, "%s", Buffer); } +static int __xray_OpenLogFile() XRAY_NEVER_INSTRUMENT { + // FIXME: Figure out how to make this less stderr-dependent. + SetPrintfAndReportCallback(PrintToStdErr); + // Open a temporary file once for the log. + static char TmpFilename[256] = {}; + static char TmpWildcardPattern[] = "XXXXXX"; + auto E = internal_strncat(TmpFilename, flags()->xray_logfile_base, + sizeof(TmpFilename) - 10); + if (static_cast<size_t>((E + 6) - TmpFilename) > (sizeof(TmpFilename) - 1)) { + Report("XRay log file base too long: %s\n", flags()->xray_logfile_base); + return -1; + } + internal_strncat(TmpFilename, TmpWildcardPattern, + sizeof(TmpWildcardPattern) - 1); + int Fd = mkstemp(TmpFilename); + if (Fd == -1) { + Report("XRay: Failed opening temporary file '%s'; not logging events.\n", + TmpFilename); + return -1; + } + if (Verbosity()) + fprintf(stderr, "XRay: Log file in '%s'\n", TmpFilename); + + // Since we're here, we get to write the header. We set it up so that the + // header will only be written once, at the start, and let the threads + // logging do writes which just append. + XRayFileHeader Header; + Header.Version = 1; + Header.Type = FileTypes::NAIVE_LOG; + Header.CycleFrequency = __xray::cycleFrequency(); + + // FIXME: Actually check whether we have 'constant_tsc' and 'nonstop_tsc' + // before setting the values in the header. + Header.ConstantTSC = 1; + Header.NonstopTSC = 1; + retryingWriteAll(Fd, reinterpret_cast<char *>(&Header), + reinterpret_cast<char *>(&Header) + sizeof(Header)); + return Fd; +} + void __xray_InMemoryRawLog(int32_t FuncId, XRayEntryType Type) XRAY_NEVER_INSTRUMENT { using Buffer = @@ -158,75 +153,7 @@ void __xray_InMemoryRawLog(int32_t FuncId, static constexpr size_t BuffLen = 1024; thread_local static Buffer InMemoryBuffer[BuffLen] = {}; thread_local static size_t Offset = 0; - static int Fd = [] { - // FIXME: Figure out how to make this less stderr-dependent. - SetPrintfAndReportCallback(PrintToStdErr); - // Open a temporary file once for the log. - static char TmpFilename[256] = {}; - static char TmpWildcardPattern[] = "XXXXXX"; - auto E = internal_strncat(TmpFilename, flags()->xray_logfile_base, - sizeof(TmpFilename) - 10); - if (static_cast<size_t>((E + 6) - TmpFilename) > - (sizeof(TmpFilename) - 1)) { - Report("XRay log file base too long: %s\n", flags()->xray_logfile_base); - return -1; - } - internal_strncat(TmpFilename, TmpWildcardPattern, - sizeof(TmpWildcardPattern) - 1); - int Fd = mkstemp(TmpFilename); - if (Fd == -1) { - Report("XRay: Failed opening temporary file '%s'; not logging events.\n", - TmpFilename); - return -1; - } - if (Verbosity()) - fprintf(stderr, "XRay: Log file in '%s'\n", TmpFilename); - - // Get the cycle frequency from SysFS on Linux. - long long CPUFrequency = -1; -#if defined(__x86_64__) - if (readValueFromFile("/sys/devices/system/cpu/cpu0/tsc_freq_khz", - &CPUFrequency)) { - CPUFrequency *= 1000; - } else if (readValueFromFile( - "/sys/devices/system/cpu/cpu0/cpufreq/cpuinfo_max_freq", - &CPUFrequency)) { - CPUFrequency *= 1000; - } else { - Report("Unable to determine CPU frequency for TSC accounting.\n"); - } -#elif defined(__arm__) || defined(__aarch64__) - // There is no instruction like RDTSCP in user mode on ARM. ARM's CP15 does - // not have a constant frequency like TSC on x86(_64), it may go faster - // or slower depending on CPU turbo or power saving mode. Furthermore, - // to read from CP15 on ARM a kernel modification or a driver is needed. - // We can not require this from users of compiler-rt. - // So on ARM we use clock_gettime() which gives the result in nanoseconds. - // To get the measurements per second, we scale this by the number of - // nanoseconds per second, pretending that the TSC frequency is 1GHz and - // one TSC tick is 1 nanosecond. - CPUFrequency = NanosecondsPerSecond; -#else -#error "Unsupported CPU Architecture" -#endif /* CPU architecture */ - - // Since we're here, we get to write the header. We set it up so that the - // header will only be written once, at the start, and let the threads - // logging do writes which just append. - XRayFileHeader Header; - Header.Version = 1; - Header.Type = FileTypes::NAIVE_LOG; - Header.CycleFrequency = - CPUFrequency == -1 ? 0 : static_cast<uint64_t>(CPUFrequency); - - // FIXME: Actually check whether we have 'constant_tsc' and 'nonstop_tsc' - // before setting the values in the header. - Header.ConstantTSC = 1; - Header.NonstopTSC = 1; - retryingWriteAll(Fd, reinterpret_cast<char *>(&Header), - reinterpret_cast<char *>(&Header) + sizeof(Header)); - return Fd; - }(); + static int Fd = __xray_OpenLogFile(); if (Fd == -1) return; thread_local __xray::ThreadExitFlusher Flusher( @@ -237,27 +164,7 @@ void __xray_InMemoryRawLog(int32_t FuncId, // through a pointer offset. auto &R = reinterpret_cast<__xray::XRayRecord *>(InMemoryBuffer)[Offset]; R.RecordType = RecordTypes::NORMAL; -#if defined(__x86_64__) - { - unsigned CPU; - R.TSC = __rdtscp(&CPU); - R.CPU = CPU; - } -#elif defined(__arm__) || defined(__aarch64__) - { - timespec TS; - int result = clock_gettime(CLOCK_REALTIME, &TS); - if (result != 0) { - Report("clock_gettime() returned %d, errno=%d.\n", result, int(errno)); - TS.tv_sec = 0; - TS.tv_nsec = 0; - } - R.TSC = TS.tv_sec * NanosecondsPerSecond + TS.tv_nsec; - R.CPU = 0; - } -#else -#error "Unsupported CPU Architecture" -#endif /* CPU architecture */ + R.TSC = __xray::readTSC(R.CPU); R.TId = TId; R.Type = Type; R.FuncId = FuncId; |