Initial OpenBSD support...

src/platform-openbsd.cc

+// Copyright 2006-2009 the V8 project authors. All rights reserved.
+// Redistribution and use in source and binary forms, with or without
+// modification, are permitted provided that the following conditions are
+// met:
+//
+//     * Redistributions of source code must retain the above copyright
+//       notice, this list of conditions and the following disclaimer.
+//     * Redistributions in binary form must reproduce the above
+//       copyright notice, this list of conditions and the following
+//       disclaimer in the documentation and/or other materials provided
+//       with the distribution.
+//     * Neither the name of Google Inc. nor the names of its
+//       contributors may be used to endorse or promote products derived
+//       from this software without specific prior written permission.
+//
+// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+
+// Platform specific code for OpenBSD goes here. For the POSIX comaptible parts
+// the implementation is in platform-posix.cc.
+
+#include <pthread.h>
+#include <semaphore.h>
+#include <signal.h>
+#include <sys/time.h>
+#include <sys/resource.h>
+#include <sys/types.h>
+#include <stdlib.h>
+
+#include <sys/types.h>  // mmap & munmap
+#include <sys/mman.h>   // mmap & munmap
+#include <sys/stat.h>   // open
+#include <sys/fcntl.h>  // open
+#include <unistd.h>     // getpagesize
+#include <execinfo.h>   // backtrace, backtrace_symbols
+#include <strings.h>    // index
+#include <errno.h>
+#include <stdarg.h>
+#include <limits.h>
+
+#undef MAP_TYPE
+
+#include "v8.h"
+
+#include "platform.h"
+
+
+namespace v8 {
+namespace internal {
+
+// 0 is never a valid thread id on OpenBSD since tids and pids share a
+// name space and pid 0 is used to kill the group (see man 2 kill).
+static const pthread_t kNoThread = (pthread_t) 0;
+
+
+double ceiling(double x) {
+    // Correct as on OS X
+    if (-1.0 < x && x < 0.0) {
+        return -0.0;
+    } else {
+        return ceil(x);
+    }
+}
+
+
+void OS::Setup() {
+  // Seed the random number generator.
+  // Convert the current time to a 64-bit integer first, before converting it
+  // to an unsigned. Going directly can cause an overflow and the seed to be
+  // set to all ones. The seed will be identical for different instances that
+  // call this setup code within the same millisecond.
+  uint64_t seed = static_cast<uint64_t>(TimeCurrentMillis());
+  srandom(static_cast<unsigned int>(seed));
+}
+
+
+double OS::nan_value() {
+  return NAN;
+}
+
+
+int OS::ActivationFrameAlignment() {
+  // 16 byte alignment on OpenBSD
+  return 16;
+}
+
+
+// We keep the lowest and highest addresses mapped as a quick way of
+// determining that pointers are outside the heap (used mostly in assertions
+// and verification).  The estimate is conservative, ie, not all addresses in
+// 'allocated' space are actually allocated to our heap.  The range is
+// [lowest, highest), inclusive on the low and and exclusive on the high end.
+static void* lowest_ever_allocated = reinterpret_cast<void*>(-1);
+static void* highest_ever_allocated = reinterpret_cast<void*>(0);
+
+
+static void UpdateAllocatedSpaceLimits(void* address, int size) {
+  lowest_ever_allocated = Min(lowest_ever_allocated, address);
+  highest_ever_allocated =
+      Max(highest_ever_allocated,
+          reinterpret_cast<void*>(reinterpret_cast<char*>(address) + size));
+}
+
+
+bool OS::IsOutsideAllocatedSpace(void* address) {
+  return address < lowest_ever_allocated || address >= highest_ever_allocated;
+}
+
+
+size_t OS::AllocateAlignment() {
+  return getpagesize();
+}
+
+
+void* OS::Allocate(const size_t requested,
+                   size_t* allocated,
+                   bool executable) {
+  const size_t msize = RoundUp(requested, getpagesize());
+  int prot = PROT_READ | PROT_WRITE | (executable ? PROT_EXEC : 0);
+  void* mbase = mmap(NULL, msize, prot, MAP_PRIVATE | MAP_ANON, -1, 0);
+
+  if (mbase == MAP_FAILED) {
+    LOG(StringEvent("OS::Allocate", "mmap failed"));
+    return NULL;
+  }
+  *allocated = msize;
+  UpdateAllocatedSpaceLimits(mbase, msize);
+  return mbase;
+}
+
+
+void OS::Free(void* buf, const size_t length) {
+  int result = munmap(buf, length);
+  USE(result);
+  ASSERT(result == 0);
+}
+
+
+#ifdef ENABLE_HEAP_PROTECTION
+
+void OS::Protect(void* address, size_t size) {
+  UNIMPLEMENTED();
+}
+
+
+void OS::Unprotect(void* address, size_t size, bool is_executable) {
+  UNIMPLEMENTED();
+}
+
+#endif
+
+
+void OS::Sleep(int milliseconds) {
+  unsigned int ms = static_cast<unsigned int>(milliseconds);
+  usleep(1000 * ms);
+}
+
+
+void OS::Abort() {
+  // Redirect to std abort to signal abnormal program termination.
+  abort();
+}
+
+
+void OS::DebugBreak() {
+#if defined(__arm__) || defined(__thumb__)
+  asm("bkpt 0");
+#else
+  asm("int $3");
+#endif
+}
+
+
+class PosixMemoryMappedFile : public OS::MemoryMappedFile {
+ public:
+  PosixMemoryMappedFile(FILE* file, void* memory, int size)
+    : file_(file), memory_(memory), size_(size) { }
+  virtual ~PosixMemoryMappedFile();
+  virtual void* memory() { return memory_; }
+ private:
+  FILE* file_;
+  void* memory_;
+  int size_;
+};
+
+
+OS::MemoryMappedFile* OS::MemoryMappedFile::create(const char* name, int size,
+    void* initial) {
+  FILE* file = fopen(name, "w+");
+  if (file == NULL) return NULL;
+  int result = fwrite(initial, size, 1, file);
+  if (result < 1) {
+    fclose(file);
+    return NULL;
+  }
+  void* memory =
+      mmap(0, size, PROT_READ | PROT_WRITE, MAP_SHARED, fileno(file), 0);
+  return new PosixMemoryMappedFile(file, memory, size);
+}
+
+
+PosixMemoryMappedFile::~PosixMemoryMappedFile() {
+  if (memory_) munmap(memory_, size_);
+  fclose(file_);
+}
+
+
+#ifdef ENABLE_LOGGING_AND_PROFILING
+static unsigned StringToLong(char* buffer) {
+  return static_cast<unsigned>(strtol(buffer, NULL, 16));  // NOLINT
+}
+#endif
+
+
+void OS::LogSharedLibraryAddresses() {
+#ifdef ENABLE_LOGGING_AND_PROFILING
+  static const int MAP_LENGTH = 1024;
+  int fd = open("/proc/self/maps", O_RDONLY);
+  if (fd < 0) return;
+  while (true) {
+    char addr_buffer[11];
+    addr_buffer[0] = '0';
+    addr_buffer[1] = 'x';
+    addr_buffer[10] = 0;
+    int result = read(fd, addr_buffer + 2, 8);
+    if (result < 8) break;
+    unsigned start = StringToLong(addr_buffer);
+    result = read(fd, addr_buffer + 2, 1);
+    if (result < 1) break;
+    if (addr_buffer[2] != '-') break;
+    result = read(fd, addr_buffer + 2, 8);
+    if (result < 8) break;
+    unsigned end = StringToLong(addr_buffer);
+    char buffer[MAP_LENGTH];
+    int bytes_read = -1;
+    do {
+      bytes_read++;
+      if (bytes_read >= MAP_LENGTH - 1)
+        break;
+      result = read(fd, buffer + bytes_read, 1);
+      if (result < 1) break;
+    } while (buffer[bytes_read] != '\n');
+    buffer[bytes_read] = 0;
+    // Ignore mappings that are not executable.
+    if (buffer[3] != 'x') continue;
+    char* start_of_path = index(buffer, '/');
+    // There may be no filename in this line.  Skip to next.
+    if (start_of_path == NULL) continue;
+    buffer[bytes_read] = 0;
+    LOG(SharedLibraryEvent(start_of_path, start, end));
+  }
+  close(fd);
+#endif
+}
+
+
+int OS::StackWalk(Vector<OS::StackFrame> frames) {
+  UNIMPLEMENTED();
+  return 1;
+}
+
+
+// Constants used for mmap.
+static const int kMmapFd = -1;
+static const int kMmapFdOffset = 0;
+
+
+VirtualMemory::VirtualMemory(size_t size) {
+  address_ = mmap(NULL, size, PROT_NONE,
+                  MAP_PRIVATE | MAP_ANON | MAP_NORESERVE,
+                  kMmapFd, kMmapFdOffset);
+  size_ = size;
+}
+
+
+VirtualMemory::~VirtualMemory() {
+  if (IsReserved()) {
+    if (0 == munmap(address(), size())) address_ = MAP_FAILED;
+  }
+}
+
+
+bool VirtualMemory::IsReserved() {
+  return address_ != MAP_FAILED;
+}
+
+
+bool VirtualMemory::Commit(void* address, size_t size, bool executable) {
+  int prot = PROT_READ | PROT_WRITE | (executable ? PROT_EXEC : 0);
+  if (MAP_FAILED == mmap(address, size, prot,
+                         MAP_PRIVATE | MAP_ANON | MAP_FIXED,
+                         kMmapFd, kMmapFdOffset)) {
+    return false;
+  }
+
+  UpdateAllocatedSpaceLimits(address, size);
+  return true;
+}
+
+
+bool VirtualMemory::Uncommit(void* address, size_t size) {
+  return mmap(address, size, PROT_NONE,
+              MAP_PRIVATE | MAP_ANON | MAP_NORESERVE,
+              kMmapFd, kMmapFdOffset) != MAP_FAILED;
+}
+
+
+class ThreadHandle::PlatformData : public Malloced {
+ public:
+  explicit PlatformData(ThreadHandle::Kind kind) {
+    Initialize(kind);
+  }
+
+  void Initialize(ThreadHandle::Kind kind) {
+    switch (kind) {
+      case ThreadHandle::SELF: thread_ = pthread_self(); break;
+      case ThreadHandle::INVALID: thread_ = kNoThread; break;
+    }
+  }
+  pthread_t thread_;  // Thread handle for pthread.
+};
+
+
+ThreadHandle::ThreadHandle(Kind kind) {
+  data_ = new PlatformData(kind);
+}
+
+
+void ThreadHandle::Initialize(ThreadHandle::Kind kind) {
+  data_->Initialize(kind);
+}
+
+
+ThreadHandle::~ThreadHandle() {
+  delete data_;
+}
+
+
+bool ThreadHandle::IsSelf() const {
+  return pthread_equal(data_->thread_, pthread_self());
+}
+
+
+bool ThreadHandle::IsValid() const {
+  return data_->thread_ != kNoThread;
+}
+
+
+Thread::Thread() : ThreadHandle(ThreadHandle::INVALID) {
+}
+
+
+Thread::~Thread() {
+}
+
+
+static void* ThreadEntry(void* arg) {
+  Thread* thread = reinterpret_cast<Thread*>(arg);
+  // This is also initialized by the first argument to pthread_create() but we
+  // don't know which thread will run first (the original thread or the new
+  // one) so we initialize it here too.
+  thread->thread_handle_data()->thread_ = pthread_self();
+  ASSERT(thread->IsValid());
+  thread->Run();
+  return NULL;
+}
+
+
+void Thread::Start() {
+  pthread_create(&thread_handle_data()->thread_, NULL, ThreadEntry, this);
+  ASSERT(IsValid());
+}
+
+
+void Thread::Join() {
+  pthread_join(thread_handle_data()->thread_, NULL);
+}
+
+
+Thread::LocalStorageKey Thread::CreateThreadLocalKey() {
+  pthread_key_t key;
+  int result = pthread_key_create(&key, NULL);
+  USE(result);
+  ASSERT(result == 0);
+  return static_cast<LocalStorageKey>(key);
+}
+
+
+void Thread::DeleteThreadLocalKey(LocalStorageKey key) {
+  pthread_key_t pthread_key = static_cast<pthread_key_t>(key);
+  int result = pthread_key_delete(pthread_key);
+  USE(result);
+  ASSERT(result == 0);
+}
+
+
+void* Thread::GetThreadLocal(LocalStorageKey key) {
+  pthread_key_t pthread_key = static_cast<pthread_key_t>(key);
+  return pthread_getspecific(pthread_key);
+}
+
+
+void Thread::SetThreadLocal(LocalStorageKey key, void* value) {
+  pthread_key_t pthread_key = static_cast<pthread_key_t>(key);
+  pthread_setspecific(pthread_key, value);
+}
+
+
+void Thread::YieldCPU() {
+  sched_yield();
+}
+
+
+class OpenBSDMutex : public Mutex {
+ public:
+
+  OpenBSDMutex() {
+    pthread_mutexattr_t attrs;
+    int result = pthread_mutexattr_init(&attrs);
+    ASSERT(result == 0);
+    result = pthread_mutexattr_settype(&attrs, PTHREAD_MUTEX_RECURSIVE);
+    ASSERT(result == 0);
+    result = pthread_mutex_init(&mutex_, &attrs);
+    ASSERT(result == 0);
+  }
+
+  virtual ~OpenBSDMutex() { pthread_mutex_destroy(&mutex_); }
+
+  virtual int Lock() {
+    int result = pthread_mutex_lock(&mutex_);
+    return result;
+  }
+
+  virtual int Unlock() {
+    int result = pthread_mutex_unlock(&mutex_);
+    return result;
+  }
+
+ private:
+  pthread_mutex_t mutex_;   // Pthread mutex for POSIX platforms.
+};
+
+
+Mutex* OS::CreateMutex() {
+  return new OpenBSDMutex();
+}
+
+
+class OpenBSDSemaphore : public Semaphore {
+ public:
+  explicit OpenBSDSemaphore(int count) {  sem_init(&sem_, 0, count); }
+  virtual ~OpenBSDSemaphore() { sem_destroy(&sem_); }
+
+  virtual void Wait();
+  virtual bool Wait(int timeout);
+  virtual void Signal() { sem_post(&sem_); }
+ private:
+  sem_t sem_;
+};
+
+
+void OpenBSDSemaphore::Wait() {
+  while (true) {
+    int result = sem_wait(&sem_);
+    if (result == 0) return;  // Successfully got semaphore.
+    CHECK(result == -1 && errno == EINTR);  // Signal caused spurious wakeup.
+  }
+}
+
+
+bool OpenBSDSemaphore::Wait(int timeout) {
+  const long kOneSecondMicros = 1000000;  // NOLINT
+
+  // Split timeout into second and nanosecond parts.
+  struct timeval delta;
+  delta.tv_usec = timeout % kOneSecondMicros;
+  delta.tv_sec = timeout / kOneSecondMicros;
+
+  struct timeval current_time;
+  // Get the current time.
+  if (gettimeofday(&current_time, NULL) == -1) {
+    return false;
+  }
+
+  // Calculate time for end of timeout.
+  struct timeval end_time;
+  timeradd(&current_time, &delta, &end_time);
+
+  struct timespec ts;
+  TIMEVAL_TO_TIMESPEC(&end_time, &ts);
+  while (true) {
+    int result = sem_trywait(&sem_);
+    if (result == 0) return true;  // Successfully got semaphore.
+    if (result == -1 && errno == ETIMEDOUT) return false;  // Timeout.
+    CHECK(result == -1 && errno == EINTR);  // Signal caused spurious wakeup.
+  }
+}
+
+
+Semaphore* OS::CreateSemaphore(int count) {
+  return new OpenBSDSemaphore(count);
+}
+
+
+#ifdef ENABLE_LOGGING_AND_PROFILING
+
+static Sampler* active_sampler_ = NULL;
+
+static void ProfilerSignalHandler(int signal, siginfo_t* info, void* context) {
+  USE(info);
+  if (signal != SIGPROF) return;
+  if (active_sampler_ == NULL) return;
+
+  TickSample sample;
+
+  // We always sample the VM state.
+  sample.state = Logger::state();
+
+  active_sampler_->Tick(&sample);
+}
+
+
+class Sampler::PlatformData : public Malloced {
+ public:
+  PlatformData() {
+    signal_handler_installed_ = false;
+  }
+
+  bool signal_handler_installed_;
+  struct sigaction old_signal_handler_;
+  struct itimerval old_timer_value_;
+};
+
+
+Sampler::Sampler(int interval, bool profiling)
+    : interval_(interval), profiling_(profiling), active_(false) {
+  data_ = new PlatformData();
+}
+
+
+Sampler::~Sampler() {
+  delete data_;
+}
+
+
+void Sampler::Start() {
+  // There can only be one active sampler at the time on POSIX
+  // platforms.
+  if (active_sampler_ != NULL) return;
+
+  // Request profiling signals.
+  struct sigaction sa;
+  sa.sa_sigaction = ProfilerSignalHandler;
+  sigemptyset(&sa.sa_mask);
+  sa.sa_flags = SA_SIGINFO;
+  if (sigaction(SIGPROF, &sa, &data_->old_signal_handler_) != 0) return;
+  data_->signal_handler_installed_ = true;
+
+  // Set the itimer to generate a tick for each interval.
+  itimerval itimer;
+  itimer.it_interval.tv_sec = interval_ / 1000;
+  itimer.it_interval.tv_usec = (interval_ % 1000) * 1000;
+  itimer.it_value.tv_sec = itimer.it_interval.tv_sec;
+  itimer.it_value.tv_usec = itimer.it_interval.tv_usec;
+  setitimer(ITIMER_PROF, &itimer, &data_->old_timer_value_);
+
+  // Set this sampler as the active sampler.
+  active_sampler_ = this;
+  active_ = true;
+}
+
+
+void Sampler::Stop() {
+  // Restore old signal handler
+  if (data_->signal_handler_installed_) {
+    setitimer(ITIMER_PROF, &data_->old_timer_value_, NULL);
+    sigaction(SIGPROF, &data_->old_signal_handler_, 0);
+    data_->signal_handler_installed_ = false;
+  }
+
+  // This sampler is no longer the active sampler.
+  active_sampler_ = NULL;
+  active_ = false;
+}
+
+#endif  // ENABLE_LOGGING_AND_PROFILING
+
+} }  // namespace v8::internal