VM: Re-format to use at most one newline between functions

runtime/vm/os_macos.cc

 // Copyright (c) 2012, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 #include "vm/globals.h"
 #if defined(HOST_OS_MACOS)
 
 #include "vm/os.h"
 
 #include <errno.h>           // NOLINT
 #include <limits.h>          // NOLINT
+#include <mach/clock.h>      // NOLINT
 #include <mach/mach.h>       // NOLINT
-#include <mach/clock.h>      // NOLINT
 #include <mach/mach_time.h>  // NOLINT
+#include <sys/resource.h>    // NOLINT
 #include <sys/time.h>        // NOLINT
-#include <sys/resource.h>    // NOLINT
 #include <unistd.h>          // NOLINT
 #if HOST_OS_IOS
 #include <sys/sysctl.h>  // NOLINT
 #include <syslog.h>      // NOLINT
 #endif
 
 #include "platform/utils.h"
 #include "vm/isolate.h"
 #include "vm/zone.h"
 
 namespace dart {
 
 const char* OS::Name() {
 #if HOST_OS_IOS
   return "ios";
 #else
   return "macos";
 #endif
 }
 
-
 intptr_t OS::ProcessId() {
   return static_cast<intptr_t>(getpid());
 }
 
-
 static bool LocalTime(int64_t seconds_since_epoch, tm* tm_result) {
   time_t seconds = static_cast<time_t>(seconds_since_epoch);
   if (seconds != seconds_since_epoch) return false;
   struct tm* error_code = localtime_r(&seconds, tm_result);
   return error_code != NULL;
 }
 
-
 const char* OS::GetTimeZoneName(int64_t seconds_since_epoch) {
   tm decomposed;
   bool succeeded = LocalTime(seconds_since_epoch, &decomposed);
   // If unsuccessful, return an empty string like V8 does.
   return (succeeded && (decomposed.tm_zone != NULL)) ? decomposed.tm_zone : "";
 }
 
-
 int OS::GetTimeZoneOffsetInSeconds(int64_t seconds_since_epoch) {
   tm decomposed;
   bool succeeded = LocalTime(seconds_since_epoch, &decomposed);
   // Even if the offset was 24 hours it would still easily fit into 32 bits.
   // If unsuccessful, return zero like V8 does.
   return succeeded ? static_cast<int>(decomposed.tm_gmtoff) : 0;
 }
 
-
 int OS::GetLocalTimeZoneAdjustmentInSeconds() {
   // TODO(floitsch): avoid excessive calls to tzset?
   tzset();
   // Even if the offset was 24 hours it would still easily fit into 32 bits.
   // Note that Unix and Dart disagree on the sign.
   return static_cast<int>(-timezone);
 }
 
-
 int64_t OS::GetCurrentTimeMillis() {
   return GetCurrentTimeMicros() / 1000;
 }
 
-
 int64_t OS::GetCurrentTimeMicros() {
   // gettimeofday has microsecond resolution.
   struct timeval tv;
   if (gettimeofday(&tv, NULL) < 0) {
     UNREACHABLE();
     return 0;
   }
   return (static_cast<int64_t>(tv.tv_sec) * 1000000) + tv.tv_usec;
 }
 
-
 #if !HOST_OS_IOS
 static mach_timebase_info_data_t timebase_info;
 #endif
 
-
 int64_t OS::GetCurrentMonotonicTicks() {
 #if HOST_OS_IOS
   // On iOS mach_absolute_time stops while the device is sleeping. Instead use
   // now - KERN_BOOTTIME to get a time difference that is not impacted by clock
   // changes. KERN_BOOTTIME will be updated by the system whenever the system
   // clock change.
   struct timeval boottime;
   int mib[2] = {CTL_KERN, KERN_BOOTTIME};
   size_t size = sizeof(boottime);
   int kr = sysctl(mib, sizeof(mib) / sizeof(mib[0]), &boottime, &size, NULL, 0);
   ASSERT(KERN_SUCCESS == kr);
   int64_t now = GetCurrentTimeMicros();
   int64_t origin = boottime.tv_sec * kMicrosecondsPerSecond;
   origin += boottime.tv_usec;
   return now - origin;
 #else
   if (timebase_info.denom == 0) {
     kern_return_t kr = mach_timebase_info(&timebase_info);
     ASSERT(KERN_SUCCESS == kr);
   }
   ASSERT(timebase_info.denom != 0);
   // timebase_info converts absolute time tick units into nanoseconds.
   int64_t result = mach_absolute_time();
   result *= timebase_info.numer;
   result /= timebase_info.denom;
   return result;
 #endif  // HOST_OS_IOS
 }
 
-
 int64_t OS::GetCurrentMonotonicFrequency() {
 #if HOST_OS_IOS
   return kMicrosecondsPerSecond;
 #else
   return kNanosecondsPerSecond;
 #endif  // HOST_OS_IOS
 }
 
-
 int64_t OS::GetCurrentMonotonicMicros() {
 #if HOST_OS_IOS
   ASSERT(GetCurrentMonotonicFrequency() == kMicrosecondsPerSecond);
   return GetCurrentMonotonicTicks();
 #else
   ASSERT(GetCurrentMonotonicFrequency() == kNanosecondsPerSecond);
   return GetCurrentMonotonicTicks() / kNanosecondsPerMicrosecond;
 #endif  // HOST_OS_IOS
 }
 
-
 int64_t OS::GetCurrentThreadCPUMicros() {
   mach_msg_type_number_t count = THREAD_BASIC_INFO_COUNT;
   thread_basic_info_data_t info_data;
   thread_basic_info_t info = &info_data;
   mach_port_t thread_port = mach_thread_self();
   if (thread_port == MACH_PORT_NULL) {
     return -1;
   }
   kern_return_t r =
       thread_info(thread_port, THREAD_BASIC_INFO, (thread_info_t)info, &count);
   mach_port_deallocate(mach_task_self(), thread_port);
   ASSERT(r == KERN_SUCCESS);
   int64_t thread_cpu_micros =
       (info->system_time.seconds + info->user_time.seconds);
   thread_cpu_micros *= kMicrosecondsPerSecond;
   thread_cpu_micros += info->user_time.microseconds;
   thread_cpu_micros += info->system_time.microseconds;
   return thread_cpu_micros;
 }
 
-
 intptr_t OS::ActivationFrameAlignment() {
 #if HOST_OS_IOS
 #if TARGET_ARCH_ARM
   // Even if we generate code that maintains a stronger alignment, we cannot
   // assert the stronger stack alignment because C++ code will not maintain it.
   return 8;
 #elif TARGET_ARCH_ARM64
   return 16;
 #elif TARGET_ARCH_IA32
   return 16;  // iOS simulator
 #elif TARGET_ARCH_X64
   return 16;  // iOS simulator
 #elif TARGET_ARCH_DBC
   return 16;
 #else
 #error Unimplemented
 #endif
 #else   // HOST_OS_IOS
   // OS X activation frames must be 16 byte-aligned; see "Mac OS X ABI
   // Function Call Guide".
   return 16;
 #endif  // HOST_OS_IOS
 }
 
-
 intptr_t OS::PreferredCodeAlignment() {
 #if defined(TARGET_ARCH_IA32) || defined(TARGET_ARCH_X64) ||                   \
     defined(TARGET_ARCH_ARM64) || defined(TARGET_ARCH_DBC)
   const int kMinimumAlignment = 32;
 #elif defined(TARGET_ARCH_ARM)
   const int kMinimumAlignment = 16;
 #else
 #error Unsupported architecture.
 #endif
   intptr_t alignment = kMinimumAlignment;
   // TODO(5411554): Allow overriding default code alignment for
   // testing purposes.
   // Flags::DebugIsInt("codealign", &alignment);
   ASSERT(Utils::IsPowerOfTwo(alignment));
   ASSERT(alignment >= kMinimumAlignment);
   ASSERT(alignment <= OS::kMaxPreferredCodeAlignment);
   return alignment;
 }
 
-
 int OS::NumberOfAvailableProcessors() {
   return sysconf(_SC_NPROCESSORS_ONLN);
 }
 
-
 uintptr_t OS::MaxRSS() {
   struct rusage usage;
   usage.ru_maxrss = 0;
   int r = getrusage(RUSAGE_SELF, &usage);
   ASSERT(r == 0);
   return usage.ru_maxrss;
 }
 
-
 void OS::Sleep(int64_t millis) {
   int64_t micros = millis * kMicrosecondsPerMillisecond;
   SleepMicros(micros);
 }
 
-
 void OS::SleepMicros(int64_t micros) {
   struct timespec req;  // requested.
   struct timespec rem;  // remainder.
   int64_t seconds = micros / kMicrosecondsPerSecond;
   if (seconds > kMaxInt32) {
     // Avoid truncation of overly large sleep values.
     seconds = kMaxInt32;
   }
   micros = micros - seconds * kMicrosecondsPerSecond;
   int64_t nanos = micros * kNanosecondsPerMicrosecond;
   req.tv_sec = static_cast<int32_t>(seconds);
   req.tv_nsec = static_cast<long>(nanos);  // NOLINT (long used in timespec).
   while (true) {
     int r = nanosleep(&req, &rem);
     if (r == 0) {
       break;
     }
     // We should only ever see an interrupt error.
     ASSERT(errno == EINTR);
     // Copy remainder into requested and repeat.
     req = rem;
   }
 }
 
-
 void OS::DebugBreak() {
   __builtin_trap();
 }
 
-
 uintptr_t DART_NOINLINE OS::GetProgramCounter() {
   return reinterpret_cast<uintptr_t>(
       __builtin_extract_return_addr(__builtin_return_address(0)));
 }
 
-
 char* OS::StrNDup(const char* s, intptr_t n) {
 // strndup has only been added to Mac OS X in 10.7. We are supplying
 // our own copy here if needed.
 #if !defined(__ENVIRONMENT_MAC_OS_X_VERSION_MIN_REQUIRED__) ||                 \
     __ENVIRONMENT_MAC_OS_X_VERSION_MIN_REQUIRED__ <= 1060
   intptr_t len = strlen(s);
   if ((n < 0) || (len < 0)) {
     return NULL;
   }
   if (n < len) {
     len = n;
   }
   char* result = reinterpret_cast<char*>(malloc(len + 1));
   if (result == NULL) {
     return NULL;
   }
   result[len] = '\0';
   return reinterpret_cast<char*>(memmove(result, s, len));
 #else   // !defined(__ENVIRONMENT_MAC_OS_X_VERSION_MIN_REQUIRED__) || ...
   return strndup(s, n);
 #endif  // !defined(__ENVIRONMENT_MAC_OS_X_VERSION_MIN_REQUIRED__) || ...
 }
 
-
 intptr_t OS::StrNLen(const char* s, intptr_t n) {
 // strnlen has only been added to Mac OS X in 10.7. We are supplying
 // our own copy here if needed.
 #if !defined(__ENVIRONMENT_MAC_OS_X_VERSION_MIN_REQUIRED__) ||                 \
     __ENVIRONMENT_MAC_OS_X_VERSION_MIN_REQUIRED__ <= 1060
   intptr_t len = 0;
   while ((len <= n) && (*s != '\0')) {
     s++;
     len++;
   }
   return len;
 #else   // !defined(__ENVIRONMENT_MAC_OS_X_VERSION_MIN_REQUIRED__) || ...
   return strnlen(s, n);
 #endif  // !defined(__ENVIRONMENT_MAC_OS_X_VERSION_MIN_REQUIRED__) || ...
 }
 
-
 void OS::Print(const char* format, ...) {
 #if HOST_OS_IOS
   va_list args;
   va_start(args, format);
   vsyslog(LOG_INFO, format, args);
   va_end(args);
 #else
   va_list args;
   va_start(args, format);
   VFPrint(stdout, format, args);
   va_end(args);
 #endif
 }
 
-
 void OS::VFPrint(FILE* stream, const char* format, va_list args) {
   vfprintf(stream, format, args);
   fflush(stream);
 }
 
-
 int OS::SNPrint(char* str, size_t size, const char* format, ...) {
   va_list args;
   va_start(args, format);
   int retval = VSNPrint(str, size, format, args);
   va_end(args);
   return retval;
 }
 
-
 int OS::VSNPrint(char* str, size_t size, const char* format, va_list args) {
   int retval = vsnprintf(str, size, format, args);
   if (retval < 0) {
     FATAL1("Fatal error in OS::VSNPrint with format '%s'", format);
   }
   return retval;
 }
 
-
 char* OS::SCreate(Zone* zone, const char* format, ...) {
   va_list args;
   va_start(args, format);
   char* buffer = VSCreate(zone, format, args);
   va_end(args);
   return buffer;
 }
 
-
 char* OS::VSCreate(Zone* zone, const char* format, va_list args) {
   // Measure.
   va_list measure_args;
   va_copy(measure_args, args);
   intptr_t len = VSNPrint(NULL, 0, format, measure_args);
   va_end(measure_args);
 
   char* buffer;
   if (zone) {
     buffer = zone->Alloc<char>(len + 1);
   } else {
     buffer = reinterpret_cast<char*>(malloc(len + 1));
   }
   ASSERT(buffer != NULL);
 
   // Print.
   va_list print_args;
   va_copy(print_args, args);
   VSNPrint(buffer, len + 1, format, print_args);
   va_end(print_args);
   return buffer;
 }
 
-
 bool OS::StringToInt64(const char* str, int64_t* value) {
   ASSERT(str != NULL && strlen(str) > 0 && value != NULL);
   int32_t base = 10;
   char* endptr;
   int i = 0;
   if (str[0] == '-') {
     i = 1;
   }
   if ((str[i] == '0') && (str[i + 1] == 'x' || str[i + 1] == 'X') &&
       (str[i + 2] != '\0')) {
     base = 16;
   }
   errno = 0;
   *value = strtoll(str, &endptr, base);
   return ((errno == 0) && (endptr != str) && (*endptr == 0));
 }
 
-
 void OS::RegisterCodeObservers() {}
 
-
 void OS::PrintErr(const char* format, ...) {
 #if HOST_OS_IOS
   va_list args;
   va_start(args, format);
   vsyslog(LOG_ERR, format, args);
   va_end(args);
 #else
   va_list args;
   va_start(args, format);
   VFPrint(stderr, format, args);
   va_end(args);
 #endif
 }
 
-
 void OS::InitOnce() {
   // TODO(5411554): For now we check that initonce is called only once,
   // Once there is more formal mechanism to call InitOnce we can move
   // this check there.
   static bool init_once_called = false;
   ASSERT(init_once_called == false);
   init_once_called = true;
 
   // See https://github.com/dart-lang/sdk/issues/29539
   // This is a workaround for a macos bug, we eagerly call localtime_r so that
   // libnotify is initialized early before any fork happens.
   struct timeval tv;
   if (gettimeofday(&tv, NULL) < 0) {
     FATAL1("gettimeofday returned an error (%s)\n", strerror(errno));
     return;
   }
   tm decomposed;
   struct tm* error_code = localtime_r(&(tv.tv_sec), &decomposed);
   if (error_code == NULL) {
     FATAL1("localtime_r returned an error (%s)\n", strerror(errno));
     return;
   }
 }
 
-
 void OS::Shutdown() {}
 
-
 void OS::Abort() {
   abort();
 }
 
-
 void OS::Exit(int code) {
   exit(code);
 }
 
 }  // namespace dart
 
 #endif  // defined(HOST_OS_MACOS)