mirror of
https://github.com/dart-lang/sdk
synced 2024-10-15 00:04:55 +00:00
b1b3e34b88
Dart VM changes: Note that the following changes are backwards compatible in the case that a Dart program has no deferred loading units (i.e., the Dart program is contained in a single shared object snapshot). When there are non-root loading units, the non-symbol stack trace header now includes information about loading units as follows: loading_unit: N, build_id: S, dso_base: A, instructions: A where N is an integer, S is a string of hex digits (0-9a-f), and A is a word-sized address printed as a hex string (without prefix). In addition, all non-symbolic stack frames for isolate instructions include a unit field, including those for the root loading unit, e.g., #NN abs <address> unit <id> virt <address> <symbol>+<offset> If there are no non-root loading units, then the non-symbolic stack trace is unchanged from its previous format. Adds a build ID to split deferred loading unit snapshots. Fixes: https://github.com/dart-lang/sdk/issues/43516 If separate debugging information is requested, the loading unit manifest includes a 'debugPath' field for each loading unit, which contains the path to its separate debugging information. Removes the attempt to store the relocated address of the instructions section when running from an assembled snapshot in the initialized BSS. Adds OS::GetAppDSOBase, which takes a pointer to the instructions section and returns a pointer to its loaded shared object in memory. For compiled-to-ELF snapshots, it does this using the relocated address of the instructions in the Image, and for assembled snapshots, it delegates to NativeSymbolResolver::LookupSharedObject. ----- Changes to package:native_stack_traces: PCOffset now has two new fields: * int? unitId: the unit ID of the loading unit, when available. * String? buildId: the build ID of the loading unit, when available. For PCOffsets in the VM section, the unitId and buildId are those of the root loading unit. The constructor for the DwarfStackTraceDecoder now takes two additional optional named arguments: * Map<int, Dwarf>? dwarfByUnitId: A map associating loading unit IDs with the appropriate Dwarf object. May or may not contain an entry for the root loading unit. * Iterable<Dwarf>? unitDwarfs: An iterable container holding Dwarf objects. May or may not contain an entry for the root loading unit. The Dwarf object that is passed to the DwarfStackTraceDecoder as a positional argument is used for all lookups within the root loading unit. If the dwarfByUnitId or unitDwarfs arguments contain an entry for the root loading unit, it should be the same as the positional argument. When decoding a non-symbolic stack frame with a non-root loading unit id, the decoder first looks in the map for the appropriate Dwarf object. If one is not found, the decoder uses the build ID for the loading unit to find the appropriate Dwarf object in the iterable container. If an appropriate Dwarf object cannot be found in either manner, the non-symbolic stack frame is emitted without change. The native_stack_traces:decode executable now takes two additional multi-options for the translate command: * -u, --unit_debug: Takes a path to the associated DWARF information. * --unit_id_debug: Takes N=FILE, where N is the loading unit ID and FILE is a path to the associated DWARF information. The arguments to -u are collected into an iterable container to be passed as the unitDwarfs argument to the DwarfStackTraceDecoder, and the arguments to --unit-id-debug are collected into a map to be passed as the dwarfByUnitId argument. TEST=vm/dart/use_dwarf_stack_traces_flag_deferred Issue: https://github.com/dart-lang/sdk/issues/53902 Change-Id: I210d4f69e4ae9fd37275a96beb1aac55c5e9d080 Cq-Include-Trybots: luci.dart.try:vm-aot-dwarf-linux-product-x64-try,vm-aot-linux-release-x64-try,vm-aot-linux-debug-x64-try,vm-aot-mac-release-arm64-try,vm-aot-mac-product-arm64-try Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/362380 Reviewed-by: Ryan Macnak <rmacnak@google.com> Commit-Queue: Tess Strickland <sstrickl@google.com>
320 lines
8.8 KiB
C++
320 lines
8.8 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(DART_HOST_OS_MACOS)
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#include "vm/os.h"
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#include <dlfcn.h> // NOLINT
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#include <errno.h> // NOLINT
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#include <limits.h> // NOLINT
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#include <mach-o/loader.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 DART_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/image_snapshot.h"
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#include "vm/isolate.h"
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#include "vm/timeline.h"
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#include "vm/zone.h"
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namespace dart {
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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 != nullptr;
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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 != nullptr)) ? decomposed.tm_zone
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: "";
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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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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, nullptr) < 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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int64_t OS::GetCurrentMonotonicTicks() {
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return clock_gettime_nsec_np(CLOCK_MONOTONIC_RAW);
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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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return clock_gettime_nsec_np(CLOCK_THREAD_CPUTIME_ID) /
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kNanosecondsPerMicrosecond;
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}
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int64_t OS::GetCurrentMonotonicMicrosForTimeline() {
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#if defined(SUPPORT_TIMELINE)
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if (Timeline::recorder_discards_clock_values()) return -1;
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return GetCurrentMonotonicMicros();
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#else
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return -1;
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#endif
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}
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intptr_t OS::ActivationFrameAlignment() {
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#if DART_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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#else
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#error Unimplemented
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#endif
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#else // DART_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 // DART_HOST_OS_IOS
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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 DART_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(nullptr, 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 != nullptr);
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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 != nullptr && strlen(str) > 0 && value != nullptr);
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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 DART_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, nullptr) < 0) {
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FATAL("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 == nullptr) {
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FATAL("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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OS::BuildId OS::GetAppBuildId(const uint8_t* snapshot_instructions) {
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// First return the build ID information from the instructions image if
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// available.
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const Image instructions_image(snapshot_instructions);
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if (auto* const image_build_id = instructions_image.build_id()) {
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return {instructions_image.build_id_length(), image_build_id};
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}
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const uint8_t* dso_base = GetAppDSOBase(snapshot_instructions);
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const auto& macho_header =
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*reinterpret_cast<const struct mach_header*>(dso_base);
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// We assume host endianness in the Mach-O file.
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if (macho_header.magic != MH_MAGIC && macho_header.magic != MH_MAGIC_64) {
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return {0, nullptr};
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}
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const size_t macho_header_size = macho_header.magic == MH_MAGIC
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? sizeof(struct mach_header)
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: sizeof(struct mach_header_64);
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const uint8_t* it = dso_base + macho_header_size;
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const uint8_t* end = it + macho_header.sizeofcmds;
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while (it < end) {
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const auto& current_cmd = *reinterpret_cast<const struct load_command*>(it);
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if ((current_cmd.cmd & ~LC_REQ_DYLD) == LC_UUID) {
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const auto& uuid_cmd = *reinterpret_cast<const struct uuid_command*>(it);
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return {
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static_cast<intptr_t>(uuid_cmd.cmdsize - sizeof(struct load_command)),
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uuid_cmd.uuid};
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}
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it += current_cmd.cmdsize;
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}
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return {0, nullptr};
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}
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} // namespace dart
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#endif // defined(DART_HOST_OS_MACOS)
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