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![Ryan Macnak](/assets/img/avatar_default.png)
Change-Id: Ie4c838c8f8b68b16a0bda2e8a59005bee6c1bf30 Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/111523 Reviewed-by: Samir Jindel <sjindel@google.com> Reviewed-by: Zach Anderson <zra@google.com> Commit-Queue: Ryan Macnak <rmacnak@google.com>
339 lines
9.1 KiB
C++
339 lines
9.1 KiB
C++
// Copyright (c) 2012, the Dart project authors. Please see the AUTHORS file
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// for details. All rights reserved. Use of this source code is governed by a
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// BSD-style license that can be found in the LICENSE file.
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#include "vm/globals.h"
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#if defined(HOST_OS_MACOS)
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#include "vm/os.h"
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#include <errno.h> // NOLINT
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#include <limits.h> // NOLINT
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#include <mach/clock.h> // NOLINT
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#include <mach/mach.h> // NOLINT
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#include <mach/mach_time.h> // NOLINT
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#include <sys/resource.h> // NOLINT
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#include <sys/time.h> // NOLINT
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#include <unistd.h> // NOLINT
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#if HOST_OS_IOS
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#include <syslog.h> // NOLINT
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#endif
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#include "platform/utils.h"
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#include "vm/isolate.h"
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#include "vm/zone.h"
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namespace dart {
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const char* OS::Name() {
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#if HOST_OS_IOS
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return "ios";
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#else
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return "macos";
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#endif
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}
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intptr_t OS::ProcessId() {
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return static_cast<intptr_t>(getpid());
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}
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static bool LocalTime(int64_t seconds_since_epoch, tm* tm_result) {
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time_t seconds = static_cast<time_t>(seconds_since_epoch);
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if (seconds != seconds_since_epoch) return false;
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struct tm* error_code = localtime_r(&seconds, tm_result);
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return error_code != NULL;
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}
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const char* OS::GetTimeZoneName(int64_t seconds_since_epoch) {
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tm decomposed;
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bool succeeded = LocalTime(seconds_since_epoch, &decomposed);
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// If unsuccessful, return an empty string like V8 does.
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return (succeeded && (decomposed.tm_zone != NULL)) ? decomposed.tm_zone : "";
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}
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int OS::GetTimeZoneOffsetInSeconds(int64_t seconds_since_epoch) {
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tm decomposed;
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bool succeeded = LocalTime(seconds_since_epoch, &decomposed);
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// Even if the offset was 24 hours it would still easily fit into 32 bits.
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// If unsuccessful, return zero like V8 does.
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return succeeded ? static_cast<int>(decomposed.tm_gmtoff) : 0;
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}
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int OS::GetLocalTimeZoneAdjustmentInSeconds() {
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// TODO(floitsch): avoid excessive calls to tzset?
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tzset();
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// Even if the offset was 24 hours it would still easily fit into 32 bits.
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// Note that Unix and Dart disagree on the sign.
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return static_cast<int>(-timezone);
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}
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int64_t OS::GetCurrentTimeMillis() {
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return GetCurrentTimeMicros() / 1000;
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}
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int64_t OS::GetCurrentTimeMicros() {
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// gettimeofday has microsecond resolution.
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struct timeval tv;
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if (gettimeofday(&tv, NULL) < 0) {
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UNREACHABLE();
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return 0;
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}
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return (static_cast<int64_t>(tv.tv_sec) * 1000000) + tv.tv_usec;
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}
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static mach_timebase_info_data_t timebase_info;
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int64_t OS::GetCurrentMonotonicTicks() {
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if (timebase_info.denom == 0) {
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kern_return_t kr = mach_timebase_info(&timebase_info);
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ASSERT(KERN_SUCCESS == kr);
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}
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ASSERT(timebase_info.denom != 0);
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// timebase_info converts absolute time tick units into nanoseconds.
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int64_t result = mach_absolute_time();
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result *= timebase_info.numer;
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result /= timebase_info.denom;
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return result;
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}
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int64_t OS::GetCurrentMonotonicFrequency() {
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return kNanosecondsPerSecond;
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}
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int64_t OS::GetCurrentMonotonicMicros() {
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ASSERT(GetCurrentMonotonicFrequency() == kNanosecondsPerSecond);
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return GetCurrentMonotonicTicks() / kNanosecondsPerMicrosecond;
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}
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int64_t OS::GetCurrentThreadCPUMicros() {
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#if HOST_OS_IOS
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// Thread CPU time appears unreliable on iOS, sometimes incorrectly reporting
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// no time elapsed.
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return -1;
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#else
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mach_msg_type_number_t count = THREAD_BASIC_INFO_COUNT;
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thread_basic_info_data_t info_data;
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thread_basic_info_t info = &info_data;
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mach_port_t thread_port = pthread_mach_thread_np(pthread_self());
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kern_return_t r =
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thread_info(thread_port, THREAD_BASIC_INFO, (thread_info_t)info, &count);
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ASSERT(r == KERN_SUCCESS);
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int64_t thread_cpu_micros =
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(info->system_time.seconds + info->user_time.seconds);
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thread_cpu_micros *= kMicrosecondsPerSecond;
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thread_cpu_micros += info->user_time.microseconds;
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thread_cpu_micros += info->system_time.microseconds;
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return thread_cpu_micros;
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#endif
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}
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intptr_t OS::ActivationFrameAlignment() {
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#if HOST_OS_IOS
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#if TARGET_ARCH_ARM
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// Even if we generate code that maintains a stronger alignment, we cannot
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// assert the stronger stack alignment because C++ code will not maintain it.
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return 8;
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#elif TARGET_ARCH_ARM64
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return 16;
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#elif TARGET_ARCH_IA32
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return 16; // iOS simulator
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#elif TARGET_ARCH_X64
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return 16; // iOS simulator
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#elif TARGET_ARCH_DBC
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return 16; // Should be at least as much as any host architecture.
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#else
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#error Unimplemented
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#endif
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#else // HOST_OS_IOS
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// OS X activation frames must be 16 byte-aligned; see "Mac OS X ABI
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// Function Call Guide".
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return 16;
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#endif // HOST_OS_IOS
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}
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intptr_t OS::PreferredCodeAlignment() {
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#if defined(TARGET_ARCH_IA32) || defined(TARGET_ARCH_X64) || \
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defined(TARGET_ARCH_ARM64) || defined(TARGET_ARCH_DBC)
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const int kMinimumAlignment = 32;
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#elif defined(TARGET_ARCH_ARM)
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const int kMinimumAlignment = 16;
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#else
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#error Unsupported architecture.
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#endif
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intptr_t alignment = kMinimumAlignment;
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// TODO(5411554): Allow overriding default code alignment for
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// testing purposes.
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// Flags::DebugIsInt("codealign", &alignment);
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ASSERT(Utils::IsPowerOfTwo(alignment));
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ASSERT(alignment >= kMinimumAlignment);
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ASSERT(alignment <= OS::kMaxPreferredCodeAlignment);
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return alignment;
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}
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int OS::NumberOfAvailableProcessors() {
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return sysconf(_SC_NPROCESSORS_ONLN);
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}
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void OS::Sleep(int64_t millis) {
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int64_t micros = millis * kMicrosecondsPerMillisecond;
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SleepMicros(micros);
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}
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void OS::SleepMicros(int64_t micros) {
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struct timespec req; // requested.
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struct timespec rem; // remainder.
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int64_t seconds = micros / kMicrosecondsPerSecond;
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if (seconds > kMaxInt32) {
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// Avoid truncation of overly large sleep values.
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seconds = kMaxInt32;
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}
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micros = micros - seconds * kMicrosecondsPerSecond;
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int64_t nanos = micros * kNanosecondsPerMicrosecond;
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req.tv_sec = static_cast<int32_t>(seconds);
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req.tv_nsec = static_cast<long>(nanos); // NOLINT (long used in timespec).
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while (true) {
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int r = nanosleep(&req, &rem);
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if (r == 0) {
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break;
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}
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// We should only ever see an interrupt error.
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ASSERT(errno == EINTR);
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// Copy remainder into requested and repeat.
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req = rem;
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}
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}
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void OS::DebugBreak() {
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__builtin_trap();
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}
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DART_NOINLINE uintptr_t OS::GetProgramCounter() {
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return reinterpret_cast<uintptr_t>(
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__builtin_extract_return_addr(__builtin_return_address(0)));
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}
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void OS::Print(const char* format, ...) {
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#if HOST_OS_IOS
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va_list args;
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va_start(args, format);
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vsyslog(LOG_INFO, format, args);
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va_end(args);
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#else
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va_list args;
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va_start(args, format);
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VFPrint(stdout, format, args);
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va_end(args);
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#endif
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}
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void OS::VFPrint(FILE* stream, const char* format, va_list args) {
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vfprintf(stream, format, args);
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fflush(stream);
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}
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char* OS::SCreate(Zone* zone, const char* format, ...) {
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va_list args;
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va_start(args, format);
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char* buffer = VSCreate(zone, format, args);
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va_end(args);
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return buffer;
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}
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char* OS::VSCreate(Zone* zone, const char* format, va_list args) {
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// Measure.
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va_list measure_args;
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va_copy(measure_args, args);
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intptr_t len = Utils::VSNPrint(NULL, 0, format, measure_args);
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va_end(measure_args);
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char* buffer;
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if (zone) {
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buffer = zone->Alloc<char>(len + 1);
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} else {
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buffer = reinterpret_cast<char*>(malloc(len + 1));
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}
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ASSERT(buffer != NULL);
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// Print.
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va_list print_args;
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va_copy(print_args, args);
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Utils::VSNPrint(buffer, len + 1, format, print_args);
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va_end(print_args);
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return buffer;
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}
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bool OS::StringToInt64(const char* str, int64_t* value) {
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ASSERT(str != NULL && strlen(str) > 0 && value != NULL);
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int32_t base = 10;
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char* endptr;
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int i = 0;
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if (str[0] == '-') {
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i = 1;
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} else if (str[0] == '+') {
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i = 1;
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}
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if ((str[i] == '0') && (str[i + 1] == 'x' || str[i + 1] == 'X') &&
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(str[i + 2] != '\0')) {
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base = 16;
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}
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errno = 0;
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if (base == 16) {
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// Unsigned 64-bit hexadecimal integer literals are allowed but
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// immediately interpreted as signed 64-bit integers.
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*value = static_cast<int64_t>(strtoull(str, &endptr, base));
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} else {
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*value = strtoll(str, &endptr, base);
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}
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return ((errno == 0) && (endptr != str) && (*endptr == 0));
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}
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void OS::RegisterCodeObservers() {}
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void OS::PrintErr(const char* format, ...) {
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#if HOST_OS_IOS
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va_list args;
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va_start(args, format);
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vsyslog(LOG_ERR, format, args);
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va_end(args);
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#else
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va_list args;
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va_start(args, format);
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VFPrint(stderr, format, args);
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va_end(args);
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#endif
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}
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void OS::Init() {
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// See https://github.com/dart-lang/sdk/issues/29539
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// This is a workaround for a macos bug, we eagerly call localtime_r so that
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// libnotify is initialized early before any fork happens.
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struct timeval tv;
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if (gettimeofday(&tv, NULL) < 0) {
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FATAL1("gettimeofday returned an error (%s)\n", strerror(errno));
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return;
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}
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tm decomposed;
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struct tm* error_code = localtime_r(&(tv.tv_sec), &decomposed);
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if (error_code == NULL) {
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FATAL1("localtime_r returned an error (%s)\n", strerror(errno));
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return;
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}
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}
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void OS::Cleanup() {}
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void OS::PrepareToAbort() {}
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void OS::Abort() {
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PrepareToAbort();
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abort();
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}
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void OS::Exit(int code) {
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exit(code);
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}
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} // namespace dart
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#endif // defined(HOST_OS_MACOS)
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