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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_ANDROID)
#include "vm/os.h"
#include <android/log.h> // NOLINT
#include <dlfcn.h> // NOLINT
#include <elf.h> // NOLINT
#include <errno.h> // NOLINT
#include <limits.h> // NOLINT
#include <malloc.h> // NOLINT
#include <sys/resource.h> // NOLINT
#include <sys/time.h> // NOLINT
#include <sys/types.h> // NOLINT
#include <time.h> // NOLINT
#include <unistd.h> // NOLINT
#include "platform/utils.h"
#include "vm/code_observers.h"
#include "vm/dart.h"
#include "vm/image_snapshot.h"
#include "vm/isolate.h"
#include "vm/timeline.h"
#include "vm/zone.h"
namespace dart {
DEFINE_FLAG(bool,
android_log_to_stderr,
false,
"Send Dart VM logs to stdout and stderr instead of the Android "
"system logs.");
// Android CodeObservers.
#ifndef PRODUCT
DEFINE_FLAG(bool,
generate_perf_events_symbols,
false,
"Generate events symbols for profiling with perf");
class PerfCodeObserver : public CodeObserver {
public:
PerfCodeObserver() : out_file_(nullptr) {
Dart_FileOpenCallback file_open = Dart::file_open_callback();
if (file_open == nullptr) {
return;
}
intptr_t pid = getpid();
char* filename = OS::SCreate(nullptr, "/tmp/perf-%" Pd ".map", pid);
out_file_ = (*file_open)(filename, true);
free(filename);
}
~PerfCodeObserver() {
Dart_FileCloseCallback file_close = Dart::file_close_callback();
if ((file_close == nullptr) || (out_file_ == nullptr)) {
return;
}
(*file_close)(out_file_);
}
virtual bool IsActive() const {
return FLAG_generate_perf_events_symbols && (out_file_ != nullptr);
}
virtual void Notify(const char* name,
uword base,
uword prologue_offset,
uword size,
bool optimized,
const CodeComments* comments) {
Dart_FileWriteCallback file_write = Dart::file_write_callback();
if ((file_write == nullptr) || (out_file_ == nullptr)) {
return;
}
const char* marker = optimized ? "*" : "";
char* buffer =
OS::SCreate(Thread::Current()->zone(), "%" Px " %" Px " %s%s\n", base,
size, marker, name);
(*file_write)(buffer, strlen(buffer), out_file_);
}
private:
void* out_file_;
DISALLOW_COPY_AND_ASSIGN(PerfCodeObserver);
};
#endif // !PRODUCT
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() {
struct timespec ts;
if (clock_gettime(CLOCK_MONOTONIC, &ts) != 0) {
UNREACHABLE();
return 0;
}
// Convert to nanoseconds.
int64_t result = ts.tv_sec;
result *= kNanosecondsPerSecond;
result += ts.tv_nsec;
return result;
}
int64_t OS::GetCurrentMonotonicFrequency() {
return kNanosecondsPerSecond;
}
int64_t OS::GetCurrentMonotonicMicros() {
int64_t ticks = GetCurrentMonotonicTicks();
ASSERT(GetCurrentMonotonicFrequency() == kNanosecondsPerSecond);
return ticks / kNanosecondsPerMicrosecond;
}
int64_t OS::GetCurrentThreadCPUMicros() {
struct timespec ts;
if (clock_gettime(CLOCK_THREAD_CPUTIME_ID, &ts) != 0) {
UNREACHABLE();
return -1;
}
int64_t result = ts.tv_sec;
result *= kMicrosecondsPerSecond;
result += (ts.tv_nsec / kNanosecondsPerMicrosecond);
return result;
}
int64_t OS::GetCurrentMonotonicMicrosForTimeline() {
#if defined(SUPPORT_TIMELINE)
if (Timeline::recorder_discards_clock_values()) return -1;
return GetCurrentMonotonicMicros();
#else
return -1;
#endif
}
// TODO(5411554): May need to hoist these architecture dependent code
// into a architecture specific file e.g: os_ia32_linux.cc
intptr_t OS::ActivationFrameAlignment() {
#if defined(TARGET_ARCH_IA32) || defined(TARGET_ARCH_X64) || \
defined(TARGET_ARCH_ARM64) || defined(TARGET_ARCH_RISCV64)
const int kMinimumAlignment = 16;
#elif defined(TARGET_ARCH_ARM)
const int kMinimumAlignment = 8;
#else
#error Unsupported architecture.
#endif
intptr_t alignment = kMinimumAlignment;
// TODO(5411554): Allow overriding default stack alignment for
// testing purposes.
// Flags::DebugIsInt("stackalign", &alignment);
ASSERT(Utils::IsPowerOfTwo(alignment));
ASSERT(alignment >= kMinimumAlignment);
return alignment;
}
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;
micros = micros - seconds * kMicrosecondsPerSecond;
int64_t nanos = micros * kNanosecondsPerMicrosecond;
req.tv_sec = seconds;
req.tv_nsec = nanos;
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, ...) {
va_list args;
va_start(args, format);
if (FLAG_android_log_to_stderr) {
vfprintf(stderr, format, args);
} else {
// Forward to the Android log for remote access.
__android_log_vprint(ANDROID_LOG_INFO, "DartVM", format, args);
}
va_end(args);
}
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() {
#ifndef PRODUCT
if (FLAG_generate_perf_events_symbols) {
CodeObservers::Register(new PerfCodeObserver);
}
#endif // !PRODUCT
}
void OS::PrintErr(const char* format, ...) {
va_list args;
va_start(args, format);
if (FLAG_android_log_to_stderr) {
vfprintf(stderr, format, args);
} else {
// Forward to the Android log for remote access.
__android_log_vprint(ANDROID_LOG_ERROR, "DartVM", format, args);
}
va_end(args);
}
void OS::Init() {}
void OS::Cleanup() {}
void OS::PrepareToAbort() {}
void OS::Abort() {
PrepareToAbort();
abort();
}
void OS::Exit(int code) {
exit(code);
}
// Used to choose between Elf32/Elf64 types based on host archotecture bitsize.
#if defined(ARCH_IS_64_BIT)
#define ElfW(Type) Elf64_##Type
#else
#define ElfW(Type) Elf32_##Type
#endif
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 ElfW(Ehdr)& elf_header = *reinterpret_cast<const ElfW(Ehdr)*>(dso_base);
const ElfW(Phdr)* const phdr_array =
reinterpret_cast<const ElfW(Phdr)*>(dso_base + elf_header.e_phoff);
for (intptr_t i = 0; i < elf_header.e_phnum; i++) {
const ElfW(Phdr)& header = phdr_array[i];
if (header.p_type != PT_NOTE) continue;
if ((header.p_flags & PF_R) != PF_R) continue;
const uint8_t* const note_addr = dso_base + header.p_vaddr;
const Elf32_Nhdr& note_header =
*reinterpret_cast<const Elf32_Nhdr*>(note_addr);
if (note_header.n_type != NT_GNU_BUILD_ID) continue;
const char* const note_contents =
reinterpret_cast<const char*>(note_addr + sizeof(Elf32_Nhdr));
// The note name contains the null terminator as well.
if (note_header.n_namesz != strlen(ELF_NOTE_GNU) + 1) continue;
if (strncmp(ELF_NOTE_GNU, note_contents, note_header.n_namesz) == 0) {
return {static_cast<intptr_t>(note_header.n_descsz),
reinterpret_cast<const uint8_t*>(note_contents +
note_header.n_namesz)};
}
}
return {0, nullptr};
}
} // namespace dart
#endif // defined(DART_HOST_OS_ANDROID)