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Diffstat (limited to 'deps/v8/src/platform-cygwin.cc')
| -rw-r--r-- | deps/v8/src/platform-cygwin.cc | 858 |
1 files changed, 0 insertions, 858 deletions
diff --git a/deps/v8/src/platform-cygwin.cc b/deps/v8/src/platform-cygwin.cc deleted file mode 100644 index 34410e8d0..000000000 --- a/deps/v8/src/platform-cygwin.cc +++ /dev/null @@ -1,858 +0,0 @@ -// Copyright 2006-2008 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 Cygwin 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> - -// Ubuntu Dapper requires memory pages to be marked as -// executable. Otherwise, OS raises an exception when executing code -// in that page. -#include <sys/types.h> // mmap & munmap -#include <sys/mman.h> // mmap & munmap -#include <sys/stat.h> // open -#include <fcntl.h> // open -#include <unistd.h> // sysconf -#ifdef __GLIBC__ -#include <execinfo.h> // backtrace, backtrace_symbols -#endif // def __GLIBC__ -#include <strings.h> // index -#include <errno.h> -#include <stdarg.h> - -#undef MAP_TYPE - -#include "v8.h" - -#include "platform.h" -#include "top.h" -#include "v8threads.h" - - -namespace v8 { -namespace internal { - -// 0 is never a valid thread id on Linux since tids and pids share a -// name space and pid 0 is reserved (see man 2 kill). -static const pthread_t kNoThread = (pthread_t) 0; - - -double ceiling(double x) { - 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)); -} - - -uint64_t OS::CpuFeaturesImpliedByPlatform() { -#if (defined(__VFP_FP__) && !defined(__SOFTFP__)) - // Here gcc is telling us that we are on an ARM and gcc is assuming that we - // have VFP3 instructions. If gcc can assume it then so can we. - return 1u << VFP3; -#elif CAN_USE_ARMV7_INSTRUCTIONS - return 1u << ARMv7; -#else - return 0; // Linux runs on anything. -#endif -} - - -#ifdef __arm__ -bool OS::ArmCpuHasFeature(CpuFeature feature) { - const char* search_string = NULL; - const char* file_name = "/proc/cpuinfo"; - // Simple detection of VFP at runtime for Linux. - // It is based on /proc/cpuinfo, which reveals hardware configuration - // to user-space applications. According to ARM (mid 2009), no similar - // facility is universally available on the ARM architectures, - // so it's up to individual OSes to provide such. - // - // This is written as a straight shot one pass parser - // and not using STL string and ifstream because, - // on Linux, it's reading from a (non-mmap-able) - // character special device. - switch (feature) { - case VFP3: - search_string = "vfp"; - break; - case ARMv7: - search_string = "ARMv7"; - break; - default: - UNREACHABLE(); - } - - FILE* f = NULL; - const char* what = search_string; - - if (NULL == (f = fopen(file_name, "r"))) - return false; - - int k; - while (EOF != (k = fgetc(f))) { - if (k == *what) { - ++what; - while ((*what != '\0') && (*what == fgetc(f))) { - ++what; - } - if (*what == '\0') { - fclose(f); - return true; - } else { - what = search_string; - } - } - } - fclose(f); - - // Did not find string in the proc file. - return false; -} -#endif // def __arm__ - - -int OS::ActivationFrameAlignment() { -#ifdef V8_TARGET_ARCH_ARM - // On EABI ARM targets this is required for fp correctness in the - // runtime system. - return 8; -#elif V8_TARGET_ARCH_MIPS - return 8; -#endif - // With gcc 4.4 the tree vectorization optimizer can generate code - // that requires 16 byte alignment such as movdqa on x86. - return 16; -} - -void OS::ReleaseStore(volatile AtomicWord* ptr, AtomicWord value) { - __asm__ __volatile__("" : : : "memory"); - // An x86 store acts as a release barrier. - *ptr = value; -} - -const char* OS::LocalTimezone(double time) { - if (isnan(time)) return ""; - time_t tv = static_cast<time_t>(floor(time/msPerSecond)); - struct tm* t = localtime(&tv); - if (NULL == t) return ""; - return tzname[0]; // The location of the timezone string on Cywin. -} - - -double OS::LocalTimeOffset() { - // - // On Cygwin, struct tm does not contain a tm_gmtoff field. - time_t utc = time(NULL); - ASSERT(utc != -1); - struct tm* loc = localtime(&utc); - ASSERT(loc != NULL); - return static_cast<double>((mktime(loc) - utc) * msPerSecond); -} - - -// 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 sysconf(_SC_PAGESIZE); -} - - -void* OS::Allocate(const size_t requested, - size_t* allocated, - bool is_executable) { - const size_t msize = RoundUp(requested, sysconf(_SC_PAGESIZE)); - int prot = PROT_READ | PROT_WRITE | (is_executable ? PROT_EXEC : 0); - void* mbase = mmap(NULL, msize, prot, MAP_PRIVATE | MAP_ANONYMOUS, -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* address, const size_t size) { - // TODO(1240712): munmap has a return value which is ignored here. - int result = munmap(address, size); - USE(result); - ASSERT(result == 0); -} - - -#ifdef ENABLE_HEAP_PROTECTION - -void OS::Protect(void* address, size_t size) { - // TODO(1240712): mprotect has a return value which is ignored here. - mprotect(address, size, PROT_READ); -} - - -void OS::Unprotect(void* address, size_t size, bool is_executable) { - // TODO(1240712): mprotect has a return value which is ignored here. - int prot = PROT_READ | PROT_WRITE | (is_executable ? PROT_EXEC : 0); - mprotect(address, size, prot); -} - -#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() { -// TODO(lrn): Introduce processor define for runtime system (!= V8_ARCH_x, -// which is the architecture of generated code). -#if (defined(__arm__) || defined(__thumb__)) && \ - defined(CAN_USE_ARMV5_INSTRUCTIONS) - asm("bkpt 0"); -#elif defined(__mips__) - asm("break"); -#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_); -} - - -void OS::LogSharedLibraryAddresses() { -#ifdef ENABLE_LOGGING_AND_PROFILING - // This function assumes that the layout of the file is as follows: - // hex_start_addr-hex_end_addr rwxp <unused data> [binary_file_name] - // If we encounter an unexpected situation we abort scanning further entries. - FILE* fp = fopen("/proc/self/maps", "r"); - if (fp == NULL) return; - - // Allocate enough room to be able to store a full file name. - const int kLibNameLen = FILENAME_MAX + 1; - char* lib_name = reinterpret_cast<char*>(malloc(kLibNameLen)); - - // This loop will terminate once the scanning hits an EOF. - while (true) { - uintptr_t start, end; - char attr_r, attr_w, attr_x, attr_p; - // Parse the addresses and permission bits at the beginning of the line. - if (fscanf(fp, "%" V8PRIxPTR "-%" V8PRIxPTR, &start, &end) != 2) break; - if (fscanf(fp, " %c%c%c%c", &attr_r, &attr_w, &attr_x, &attr_p) != 4) break; - - int c; - if (attr_r == 'r' && attr_w != 'w' && attr_x == 'x') { - // Found a read-only executable entry. Skip characters until we reach - // the beginning of the filename or the end of the line. - do { - c = getc(fp); - } while ((c != EOF) && (c != '\n') && (c != '/')); - if (c == EOF) break; // EOF: Was unexpected, just exit. - - // Process the filename if found. - if (c == '/') { - ungetc(c, fp); // Push the '/' back into the stream to be read below. - - // Read to the end of the line. Exit if the read fails. - if (fgets(lib_name, kLibNameLen, fp) == NULL) break; - - // Drop the newline character read by fgets. We do not need to check - // for a zero-length string because we know that we at least read the - // '/' character. - lib_name[strlen(lib_name) - 1] = '\0'; - } else { - // No library name found, just record the raw address range. - snprintf(lib_name, kLibNameLen, - "%08" V8PRIxPTR "-%08" V8PRIxPTR, start, end); - } - LOG(SharedLibraryEvent(lib_name, start, end)); - } else { - // Entry not describing executable data. Skip to end of line to setup - // reading the next entry. - do { - c = getc(fp); - } while ((c != EOF) && (c != '\n')); - if (c == EOF) break; - } - } - free(lib_name); - fclose(fp); -#endif -} - - -int OS::StackWalk(Vector<OS::StackFrame> frames) { - // backtrace is a glibc extension. -#ifdef __GLIBC__ - int frames_size = frames.length(); - ScopedVector<void*> addresses(frames_size); - - int frames_count = backtrace(addresses.start(), frames_size); - - char** symbols = backtrace_symbols(addresses.start(), frames_count); - if (symbols == NULL) { - return kStackWalkError; - } - - for (int i = 0; i < frames_count; i++) { - frames[i].address = addresses[i]; - // Format a text representation of the frame based on the information - // available. - SNPrintF(MutableCStrVector(frames[i].text, kStackWalkMaxTextLen), - "%s", - symbols[i]); - // Make sure line termination is in place. - frames[i].text[kStackWalkMaxTextLen - 1] = '\0'; - } - - free(symbols); - - return frames_count; -#else // ndef __GLIBC__ - return 0; -#endif // ndef __GLIBC__ -} - - -// 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_ANONYMOUS | 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 is_executable) { - int prot = PROT_READ | PROT_WRITE | (is_executable ? PROT_EXEC : 0); - -#ifdef HAS_MAP_FIXED - if (MAP_FAILED == mmap(address, size, prot, - MAP_PRIVATE | MAP_ANONYMOUS, // | MAP_FIXED, - Cygwin doesn't have MAP_FIXED - kMmapFd, kMmapFdOffset)) { - return false; - } -#else - if (mprotect(address, size, prot) != 0) { - return false; - } -#endif - - UpdateAllocatedSpaceLimits(address, size); - return true; -} - - -bool VirtualMemory::Uncommit(void* address, size_t size) { - return mmap(address, size, PROT_NONE, - MAP_PRIVATE | MAP_ANONYMOUS | MAP_NORESERVE, // | MAP_FIXED, - Cygwin doesn't have MAP_FIXED - 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 CygwinMutex : public Mutex { - public: - - CygwinMutex() { - pthread_mutexattr_t attrs; - memset(&attrs, 0, sizeof(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 ~CygwinMutex() { 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 CygwinMutex(); -} - - -class CygwinSemaphore : public Semaphore { - public: - explicit CygwinSemaphore(int count) { sem_init(&sem_, 0, count); } - virtual ~CygwinSemaphore() { sem_destroy(&sem_); } - - virtual void Wait(); - virtual bool Wait(int timeout); - virtual void Signal() { sem_post(&sem_); } - private: - sem_t sem_; -}; - - -void CygwinSemaphore::Wait() { - while (true) { - int result = sem_wait(&sem_); - if (result == 0) return; // Successfully got semaphore. - CHECK(result == -1 && errno == EINTR); // Signal caused spurious wakeup. - } -} - - -#ifndef TIMEVAL_TO_TIMESPEC -#define TIMEVAL_TO_TIMESPEC(tv, ts) do { \ - (ts)->tv_sec = (tv)->tv_sec; \ - (ts)->tv_nsec = (tv)->tv_usec * 1000; \ -} while (false) -#endif - - -bool CygwinSemaphore::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(¤t_time, NULL) == -1) { - return false; - } - - // Calculate time for end of timeout. - struct timeval end_time; - timeradd(¤t_time, &delta, &end_time); - - struct timespec ts; - TIMEVAL_TO_TIMESPEC(&end_time, &ts); - // Wait for semaphore signalled or timeout. - while (true) { - int result = sem_timedwait(&sem_, &ts); - if (result == 0) return true; // Successfully got semaphore. - if (result > 0) { - // For glibc prior to 2.3.4 sem_timedwait returns the error instead of -1. - errno = result; - result = -1; - } - if (result == -1 && errno == ETIMEDOUT) return false; // Timeout. - CHECK(result == -1 && errno == EINTR); // Signal caused spurious wakeup. - } -} - - -Semaphore* OS::CreateSemaphore(int count) { - return new CygwinSemaphore(count); -} - - -#ifdef ENABLE_LOGGING_AND_PROFILING - -static Sampler* active_sampler_ = NULL; -static pthread_t vm_thread_ = 0; - - -#if !defined(__GLIBC__) && (defined(__arm__) || defined(__thumb__)) -// Android runs a fairly new Linux kernel, so signal info is there, -// but the C library doesn't have the structs defined. - -struct sigcontext { - uint32_t trap_no; - uint32_t error_code; - uint32_t oldmask; - uint32_t gregs[16]; - uint32_t arm_cpsr; - uint32_t fault_address; -}; -typedef uint32_t __sigset_t; -typedef struct sigcontext mcontext_t; -typedef struct ucontext { - uint32_t uc_flags; - struct ucontext* uc_link; - stack_t uc_stack; - mcontext_t uc_mcontext; - __sigset_t uc_sigmask; -} ucontext_t; -enum ArmRegisters {R15 = 15, R13 = 13, R11 = 11}; - -#endif - - -// A function that determines if a signal handler is called in the context -// of a VM thread. -// -// The problem is that SIGPROF signal can be delivered to an arbitrary thread -// (see http://code.google.com/p/google-perftools/issues/detail?id=106#c2) -// So, if the signal is being handled in the context of a non-VM thread, -// it means that the VM thread is running, and trying to sample its stack can -// cause a crash. -static inline bool IsVmThread() { - // In the case of a single VM thread, this check is enough. - if (pthread_equal(pthread_self(), vm_thread_)) return true; - // If there are multiple threads that use VM, they must have a thread id - // stored in TLS. To verify that the thread is really executing VM, - // we check Top's data. Having that ThreadManager::RestoreThread first - // restores ThreadLocalTop from TLS, and only then erases the TLS value, - // reading Top::thread_id() should not be affected by races. - if (ThreadManager::HasId() && !ThreadManager::IsArchived() && - ThreadManager::CurrentId() == Top::thread_id()) { - return true; - } - return false; -} - - -static void ProfilerSignalHandler(int signal, siginfo_t* info, void* context) { -#ifndef V8_HOST_ARCH_MIPS - USE(info); - if (signal != SIGPROF) return; - if (active_sampler_ == NULL) return; - - TickSample sample_obj; - TickSample* sample = CpuProfiler::TickSampleEvent(); - if (sample == NULL) sample = &sample_obj; - - // We always sample the VM state. - sample->state = VMState::current_state(); - -#if 0 - // If profiling, we extract the current pc and sp. - if (active_sampler_->IsProfiling()) { - // Extracting the sample from the context is extremely machine dependent. - ucontext_t* ucontext = reinterpret_cast<ucontext_t*>(context); - mcontext_t& mcontext = ucontext->uc_mcontext; -#if V8_HOST_ARCH_IA32 - sample->pc = reinterpret_cast<Address>(mcontext.gregs[REG_EIP]); - sample->sp = reinterpret_cast<Address>(mcontext.gregs[REG_ESP]); - sample->fp = reinterpret_cast<Address>(mcontext.gregs[REG_EBP]); -#elif V8_HOST_ARCH_X64 - sample->pc = reinterpret_cast<Address>(mcontext.gregs[REG_RIP]); - sample->sp = reinterpret_cast<Address>(mcontext.gregs[REG_RSP]); - sample->fp = reinterpret_cast<Address>(mcontext.gregs[REG_RBP]); -#elif V8_HOST_ARCH_ARM -// An undefined macro evaluates to 0, so this applies to Android's Bionic also. -#if (__GLIBC__ < 2 || (__GLIBC__ == 2 && __GLIBC_MINOR__ <= 3)) - sample->pc = reinterpret_cast<Address>(mcontext.gregs[R15]); - sample->sp = reinterpret_cast<Address>(mcontext.gregs[R13]); - sample->fp = reinterpret_cast<Address>(mcontext.gregs[R11]); -#else - sample->pc = reinterpret_cast<Address>(mcontext.arm_pc); - sample->sp = reinterpret_cast<Address>(mcontext.arm_sp); - sample->fp = reinterpret_cast<Address>(mcontext.arm_fp); -#endif -#elif V8_HOST_ARCH_MIPS - // Implement this on MIPS. - UNIMPLEMENTED(); -#endif - if (IsVmThread()) { - active_sampler_->SampleStack(sample); - } - } -#endif - - active_sampler_->Tick(sample); -#endif -} - - -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; - - vm_thread_ = pthread_self(); - - // 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 |