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// 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(DART_HOST_OS_MACOS)
#include "vm/os.h"
#include <dlfcn.h> // NOLINT
#include <errno.h> // NOLINT
#include <limits.h> // NOLINT
#include <mach-o/loader.h> // NOLINT
#include <mach/clock.h> // NOLINT
#include <mach/mach.h> // NOLINT
#include <mach/mach_time.h> // NOLINT
#include <sys/resource.h> // NOLINT
#include <sys/time.h> // NOLINT
#include <unistd.h> // NOLINT
#if DART_HOST_OS_IOS
#include <syslog.h> // NOLINT
#endif
#include "platform/utils.h"
#include "vm/image_snapshot.h"
#include "vm/isolate.h"
#include "vm/timeline.h"
#include "vm/zone.h"
namespace dart {
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 != nullptr;
}
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 != nullptr)) ? 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;
}
int64_t OS::GetCurrentTimeMillis() {
return GetCurrentTimeMicros() / 1000;
}
int64_t OS::GetCurrentTimeMicros() {
// gettimeofday has microsecond resolution.
struct timeval tv;
if (gettimeofday(&tv, nullptr) < 0) {
UNREACHABLE();
return 0;
}
return (static_cast<int64_t>(tv.tv_sec) * 1000000) + tv.tv_usec;
}
int64_t OS::GetCurrentMonotonicTicks() {
return clock_gettime_nsec_np(CLOCK_MONOTONIC_RAW);
}
int64_t OS::GetCurrentMonotonicFrequency() {
return kNanosecondsPerSecond;
}
int64_t OS::GetCurrentMonotonicMicros() {
ASSERT(GetCurrentMonotonicFrequency() == kNanosecondsPerSecond);
return GetCurrentMonotonicTicks() / kNanosecondsPerMicrosecond;
}
int64_t OS::GetCurrentThreadCPUMicros() {
return clock_gettime_nsec_np(CLOCK_THREAD_CPUTIME_ID) /
kNanosecondsPerMicrosecond;
}
int64_t OS::GetCurrentMonotonicMicrosForTimeline() {
#if defined(SUPPORT_TIMELINE)
if (Timeline::recorder_discards_clock_values()) return -1;
return GetCurrentMonotonicMicros();
#else
return -1;
#endif
}
intptr_t OS::ActivationFrameAlignment() {
#if DART_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
#else
#error Unimplemented
#endif
#else // DART_HOST_OS_IOS
// OS X activation frames must be 16 byte-aligned; see "Mac OS X ABI
// Function Call Guide".
return 16;
#endif // DART_HOST_OS_IOS
}
int OS::NumberOfAvailableProcessors() {
return sysconf(_SC_NPROCESSORS_ONLN);
}
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();
}
DART_NOINLINE uintptr_t OS::GetProgramCounter() {
return reinterpret_cast<uintptr_t>(
__builtin_extract_return_addr(__builtin_return_address(0)));
}
void OS::Print(const char* format, ...) {
#if DART_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);
}
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 = Utils::VSNPrint(nullptr, 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 != nullptr);
// Print.
va_list print_args;
va_copy(print_args, args);
Utils::VSNPrint(buffer, len + 1, format, print_args);
va_end(print_args);
return buffer;
}
bool OS::StringToInt64(const char* str, int64_t* value) {
ASSERT(str != nullptr && strlen(str) > 0 && value != nullptr);
int32_t base = 10;
char* endptr;
int i = 0;
if (str[0] == '-') {
i = 1;
} else 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;
if (base == 16) {
// Unsigned 64-bit hexadecimal integer literals are allowed but
// immediately interpreted as signed 64-bit integers.
*value = static_cast<int64_t>(strtoull(str, &endptr, base));
} else {
*value = strtoll(str, &endptr, base);
}
return ((errno == 0) && (endptr != str) && (*endptr == 0));
}
void OS::RegisterCodeObservers() {}
void OS::PrintErr(const char* format, ...) {
#if DART_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::Init() {
// 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, nullptr) < 0) {
FATAL("gettimeofday returned an error (%s)\n", strerror(errno));
return;
}
tm decomposed;
struct tm* error_code = localtime_r(&(tv.tv_sec), &decomposed);
if (error_code == nullptr) {
FATAL("localtime_r returned an error (%s)\n", strerror(errno));
return;
}
}
void OS::Cleanup() {}
void OS::PrepareToAbort() {}
void OS::Abort() {
PrepareToAbort();
abort();
}
void OS::Exit(int code) {
exit(code);
}
OS::BuildId OS::GetAppBuildId(const uint8_t* snapshot_instructions) {
// First return the build ID information from the instructions image if
// available.
const Image instructions_image(snapshot_instructions);
if (auto* const image_build_id = instructions_image.build_id()) {
return {instructions_image.build_id_length(), image_build_id};
}
const uint8_t* dso_base = GetAppDSOBase(snapshot_instructions);
const auto& macho_header =
*reinterpret_cast<const struct mach_header*>(dso_base);
// We assume host endianness in the Mach-O file.
if (macho_header.magic != MH_MAGIC && macho_header.magic != MH_MAGIC_64) {
return {0, nullptr};
}
const size_t macho_header_size = macho_header.magic == MH_MAGIC
? sizeof(struct mach_header)
: sizeof(struct mach_header_64);
const uint8_t* it = dso_base + macho_header_size;
const uint8_t* end = it + macho_header.sizeofcmds;
while (it < end) {
const auto& current_cmd = *reinterpret_cast<const struct load_command*>(it);
if ((current_cmd.cmd & ~LC_REQ_DYLD) == LC_UUID) {
const auto& uuid_cmd = *reinterpret_cast<const struct uuid_command*>(it);
return {
static_cast<intptr_t>(uuid_cmd.cmdsize - sizeof(struct load_command)),
uuid_cmd.uuid};
}
it += current_cmd.cmdsize;
}
return {0, nullptr};
}
} // namespace dart
#endif // defined(DART_HOST_OS_MACOS)