mirror of
https://github.com/dart-lang/sdk
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2bfecc160b
TEST=build Change-Id: I2dd8ae69764af27f480a19995b491e98f52476ae Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/293902 Reviewed-by: Liam Appelbe <liama@google.com> Commit-Queue: Ryan Macnak <rmacnak@google.com>
663 lines
18 KiB
C++
663 lines
18 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_LINUX)
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#include "vm/os.h"
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#include <errno.h> // NOLINT
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#include <fcntl.h> // NOLINT
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#include <limits.h> // NOLINT
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#include <malloc.h> // NOLINT
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#include <sys/mman.h> // NOLINT
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#include <sys/resource.h> // NOLINT
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#include <sys/stat.h> // NOLINT
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#include <sys/syscall.h> // NOLINT
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#include <sys/time.h> // NOLINT
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#include <sys/types.h> // NOLINT
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#include <time.h> // NOLINT
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#include <unistd.h> // NOLINT
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#include "platform/memory_sanitizer.h"
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#include "platform/utils.h"
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#include "vm/code_comments.h"
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#include "vm/code_observers.h"
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#include "vm/dart.h"
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#include "vm/flags.h"
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#include "vm/isolate.h"
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#include "vm/lockers.h"
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#include "vm/os_thread.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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#ifndef PRODUCT
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DEFINE_FLAG(bool,
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generate_perf_events_symbols,
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false,
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"Generate events symbols for profiling with perf (disables dual "
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"code mapping)");
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DEFINE_FLAG(bool,
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generate_perf_jitdump,
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false,
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"Generate jitdump file to use with perf-inject (disables dual code "
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"mapping)");
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DECLARE_FLAG(bool, write_protect_code);
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DECLARE_FLAG(bool, write_protect_vm_isolate);
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#if !defined(DART_PRECOMPILED_RUNTIME)
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DECLARE_FLAG(bool, code_comments);
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#endif
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// Linux CodeObservers.
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// Simple perf support: generate /tmp/perf-<pid>.map file that maps
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// memory ranges to symbol names for JIT generated code. This allows
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// perf-report to resolve addresses falling into JIT generated code.
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// However perf-annotate does not work in this mode because JIT code
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// is transient and does not exist anymore at the moment when you
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// invoke perf-report.
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class PerfCodeObserver : public CodeObserver {
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public:
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PerfCodeObserver() : out_file_(nullptr) {
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Dart_FileOpenCallback file_open = Dart::file_open_callback();
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if (file_open == nullptr) {
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return;
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}
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intptr_t pid = getpid();
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char* filename = OS::SCreate(nullptr, "/tmp/perf-%" Pd ".map", pid);
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out_file_ = (*file_open)(filename, true);
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free(filename);
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}
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~PerfCodeObserver() {
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Dart_FileCloseCallback file_close = Dart::file_close_callback();
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if ((file_close == nullptr) || (out_file_ == nullptr)) {
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return;
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}
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(*file_close)(out_file_);
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}
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virtual bool IsActive() const {
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return FLAG_generate_perf_events_symbols && (out_file_ != nullptr);
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}
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virtual void Notify(const char* name,
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uword base,
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uword prologue_offset,
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uword size,
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bool optimized,
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const CodeComments* comments) {
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Dart_FileWriteCallback file_write = Dart::file_write_callback();
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if ((file_write == nullptr) || (out_file_ == nullptr)) {
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return;
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}
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const char* marker = optimized ? "*" : "";
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char* buffer =
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OS::SCreate(Thread::Current()->zone(), "%" Px " %" Px " %s%s\n", base,
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size, marker, name);
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{
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MutexLocker ml(CodeObservers::mutex());
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(*file_write)(buffer, strlen(buffer), out_file_);
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}
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}
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private:
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void* out_file_;
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DISALLOW_COPY_AND_ASSIGN(PerfCodeObserver);
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};
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// Code observer that generates a JITDUMP[1] file that can be interpreted by
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// perf-inject to generate ELF images for JIT generated code objects, which
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// allows both perf-report and perf-annotate to recognize them.
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//
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// Usage:
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//
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// $ perf record -k mono dart --generate-perf-jitdump benchmark.dart
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// $ perf inject -j -i perf.data -o perf.data.jitted
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// $ perf report -i perf.data.jitted
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//
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// [1] see linux/tools/perf/Documentation/jitdump-specification.txt for
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// JITDUMP binary format.
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class JitDumpCodeObserver : public CodeObserver {
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public:
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JitDumpCodeObserver() : pid_(getpid()) {
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char* const filename = OS::SCreate(nullptr, "/tmp/jit-%" Pd ".dump", pid_);
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const int fd = open(filename, O_CREAT | O_TRUNC | O_RDWR, 0666);
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free(filename);
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if (fd == -1) {
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return;
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}
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// Map JITDUMP file, this mapping will be recorded by perf. This allows
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// perf-inject to find this file later.
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const long page_size = sysconf(_SC_PAGESIZE); // NOLINT(runtime/int)
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if (page_size == -1) {
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close(fd);
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return;
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}
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mapped_ =
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mmap(nullptr, page_size, PROT_READ | PROT_EXEC, MAP_PRIVATE, fd, 0);
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if (mapped_ == nullptr) {
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close(fd);
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return;
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}
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mapped_size_ = page_size;
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out_file_ = fdopen(fd, "w+");
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if (out_file_ == nullptr) {
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close(fd);
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return;
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}
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// Buffer the output to avoid high IO overheads - we are going to be
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// writing all JIT generated code out.
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setvbuf(out_file_, nullptr, _IOFBF, 2 * MB);
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// Disable code write protection and vm isolate write protection, because
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// calling mprotect on the pages filled with JIT generated code objects
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// confuses perf.
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FLAG_write_protect_code = false;
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FLAG_write_protect_vm_isolate = false;
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#if !defined(DART_PRECOMPILED_RUNTIME)
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// Enable code comments.
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FLAG_code_comments = true;
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#endif
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// Write JITDUMP header.
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WriteHeader();
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}
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~JitDumpCodeObserver() {
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if (mapped_ != nullptr) {
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munmap(mapped_, mapped_size_);
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mapped_ = nullptr;
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}
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if (out_file_ != nullptr) {
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fclose(out_file_);
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out_file_ = nullptr;
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}
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}
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virtual bool IsActive() const {
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return FLAG_generate_perf_jitdump && (out_file_ != nullptr);
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}
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virtual void Notify(const char* name,
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uword base,
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uword prologue_offset,
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uword size,
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bool optimized,
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const CodeComments* comments) {
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MutexLocker ml(CodeObservers::mutex());
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const char* marker = optimized ? "*" : "";
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char* buffer = OS::SCreate(Thread::Current()->zone(), "%s%s", marker, name);
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const size_t name_length = strlen(buffer);
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WriteDebugInfo(base, comments);
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CodeLoadEvent ev;
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ev.event = BaseEvent::kLoad;
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ev.size = sizeof(ev) + (name_length + 1) + size;
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ev.time_stamp = OS::GetCurrentMonotonicTicks();
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ev.process_id = getpid();
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ev.thread_id = syscall(SYS_gettid);
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ev.vma = base;
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ev.code_address = base;
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ev.code_size = size;
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ev.code_id = code_id_++;
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WriteFully(&ev, sizeof(ev));
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WriteFully(buffer, name_length + 1);
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WriteFully(reinterpret_cast<void*>(base), size);
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}
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private:
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struct Header {
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const uint32_t magic = 0x4A695444;
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const uint32_t version = 1;
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const uint32_t size = sizeof(Header);
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uint32_t elf_mach_target;
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const uint32_t reserved = 0xDEADBEEF;
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uint32_t process_id;
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uint64_t time_stamp;
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const uint64_t flags = 0;
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};
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struct BaseEvent {
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enum Event {
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kLoad = 0,
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kMove = 1,
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kDebugInfo = 2,
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kClose = 3,
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kUnwindingInfo = 4
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};
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uint32_t event;
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uint32_t size;
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uint64_t time_stamp;
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};
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struct CodeLoadEvent : BaseEvent {
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uint32_t process_id;
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uint32_t thread_id;
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uint64_t vma;
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uint64_t code_address;
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uint64_t code_size;
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uint64_t code_id;
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};
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struct DebugInfoEvent : BaseEvent {
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uint64_t address;
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uint64_t entry_count;
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// DebugInfoEntry entries[entry_count_];
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};
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struct DebugInfoEntry {
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uint64_t address;
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int32_t line_number;
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int32_t column;
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// Followed by nul-terminated name.
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};
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// ELF machine architectures
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// From linux/include/uapi/linux/elf-em.h
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static constexpr uint32_t EM_386 = 3;
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static constexpr uint32_t EM_X86_64 = 62;
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static constexpr uint32_t EM_ARM = 40;
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static constexpr uint32_t EM_AARCH64 = 183;
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static constexpr uint32_t EM_RISCV = 243;
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static uint32_t GetElfMachineArchitecture() {
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#if TARGET_ARCH_IA32
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return EM_386;
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#elif TARGET_ARCH_X64
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return EM_X86_64;
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#elif TARGET_ARCH_ARM
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return EM_ARM;
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#elif TARGET_ARCH_ARM64
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return EM_AARCH64;
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#elif TARGET_ARCH_RISCV32 || TARGET_ARCH_RISCV64
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return EM_RISCV;
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#else
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UNREACHABLE();
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return 0;
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#endif
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}
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#if ARCH_IS_64_BIT
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static constexpr int kElfHeaderSize = 0x40;
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#else
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static constexpr int kElfHeaderSize = 0x34;
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#endif
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void WriteDebugInfo(uword base, const CodeComments* comments) {
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if (comments == nullptr || comments->Length() == 0) {
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return;
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}
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// Open the comments file for the given code object.
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// Note: for some reason we can't emit all comments into a single file
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// the mapping between PCs and lines goes out of sync (might be
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// perf-annotate bug).
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char* comments_file_name =
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OS::SCreate(nullptr, "/tmp/jit-%" Pd "-%" Pd ".cmts", pid_, code_id_);
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const intptr_t filename_length = strlen(comments_file_name);
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FILE* comments_file = fopen(comments_file_name, "w");
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setvbuf(comments_file, nullptr, _IOFBF, 2 * MB);
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// Count the number of DebugInfoEntry we are going to emit: one
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// per PC.
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intptr_t entry_count = 0;
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for (uint64_t i = 0, len = comments->Length(); i < len;) {
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const intptr_t pc_offset = comments->PCOffsetAt(i);
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while (i < len && comments->PCOffsetAt(i) == pc_offset) {
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i++;
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}
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entry_count++;
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}
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DebugInfoEvent info;
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info.event = BaseEvent::kDebugInfo;
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info.time_stamp = OS::GetCurrentMonotonicTicks();
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info.address = base;
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info.entry_count = entry_count;
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info.size = sizeof(info) +
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entry_count * (sizeof(DebugInfoEntry) + filename_length + 1);
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const int32_t padding = Utils::RoundUp(info.size, 8) - info.size;
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info.size += padding;
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// Write out DebugInfoEvent record followed by entry_count DebugInfoEntry
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// records.
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WriteFully(&info, sizeof(info));
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intptr_t line_number = 0; // Line number within comments_file.
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for (intptr_t i = 0, len = comments->Length(); i < len;) {
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const intptr_t pc_offset = comments->PCOffsetAt(i);
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while (i < len && comments->PCOffsetAt(i) == pc_offset) {
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line_number += WriteLn(comments_file, comments->CommentAt(i));
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i++;
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}
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DebugInfoEntry entry;
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entry.address = base + pc_offset + kElfHeaderSize;
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entry.line_number = line_number;
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entry.column = 0;
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WriteFully(&entry, sizeof(entry));
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WriteFully(comments_file_name, filename_length + 1);
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}
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// Write out the padding.
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const char padding_bytes[8] = {0};
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WriteFully(padding_bytes, padding);
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fclose(comments_file);
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free(comments_file_name);
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}
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void WriteHeader() {
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Header header;
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header.elf_mach_target = GetElfMachineArchitecture();
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header.process_id = getpid();
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header.time_stamp = OS::GetCurrentTimeMicros();
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WriteFully(&header, sizeof(header));
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}
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// Returns number of new-lines written.
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intptr_t WriteLn(FILE* f, const char* comment) {
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fputs(comment, f);
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fputc('\n', f);
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intptr_t line_count = 1;
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while ((comment = strstr(comment, "\n")) != nullptr) {
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line_count++;
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}
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return line_count;
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}
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void WriteFully(const void* buffer, size_t size) {
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const char* ptr = static_cast<const char*>(buffer);
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while (size > 0) {
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const size_t written = fwrite(ptr, 1, size, out_file_);
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if (written == 0) {
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UNREACHABLE();
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break;
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}
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size -= written;
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ptr += written;
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}
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}
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const intptr_t pid_;
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FILE* out_file_ = nullptr;
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void* mapped_ = nullptr;
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long mapped_size_ = 0; // NOLINT(runtime/int)
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intptr_t code_id_ = 0;
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DISALLOW_COPY_AND_ASSIGN(JitDumpCodeObserver);
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};
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#endif // !PRODUCT
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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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struct timespec ts;
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if (clock_gettime(CLOCK_MONOTONIC, &ts) != 0) {
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UNREACHABLE();
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return 0;
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}
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// Convert to nanoseconds.
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int64_t result = ts.tv_sec;
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result *= kNanosecondsPerSecond;
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result += ts.tv_nsec;
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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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int64_t ticks = GetCurrentMonotonicTicks();
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ASSERT(GetCurrentMonotonicFrequency() == kNanosecondsPerSecond);
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return ticks / kNanosecondsPerMicrosecond;
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}
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int64_t OS::GetCurrentThreadCPUMicros() {
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struct timespec ts;
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if (clock_gettime(CLOCK_THREAD_CPUTIME_ID, &ts) != 0) {
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UNREACHABLE();
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return -1;
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}
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int64_t result = ts.tv_sec;
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result *= kMicrosecondsPerSecond;
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result += (ts.tv_nsec / kNanosecondsPerMicrosecond);
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return result;
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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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// TODO(5411554): May need to hoist these architecture dependent code
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// into a architecture specific file e.g: os_ia32_linux.cc
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intptr_t OS::ActivationFrameAlignment() {
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#if defined(TARGET_ARCH_IA32) || defined(TARGET_ARCH_X64) || \
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defined(TARGET_ARCH_ARM64) || defined(TARGET_ARCH_RISCV32) || \
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defined(TARGET_ARCH_RISCV64)
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const int kMinimumAlignment = 16;
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#elif defined(TARGET_ARCH_ARM)
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const int kMinimumAlignment = 8;
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#else
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#error Unsupported architecture.
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#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;
|
|
}
|
|
}
|
|
|
|
// TODO(regis): Function called only from the simulator.
|
|
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);
|
|
VFPrint(stdout, 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 != nullptr) {
|
|
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);
|
|
}
|
|
|
|
if (FLAG_generate_perf_jitdump) {
|
|
CodeObservers::Register(new JitDumpCodeObserver);
|
|
}
|
|
#endif // !PRODUCT
|
|
}
|
|
|
|
void OS::PrintErr(const char* format, ...) {
|
|
va_list args;
|
|
va_start(args, format);
|
|
VFPrint(stderr, 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);
|
|
}
|
|
|
|
} // namespace dart
|
|
|
|
#endif // defined(DART_HOST_OS_LINUX)
|