From 9bf51816bed45ef41d3e5e54bedcb0c8d01384e8 Mon Sep 17 00:00:00 2001 From: unknown Date: Wed, 8 Sep 2010 14:57:59 -0700 Subject: [PATCH] Patch for Cygwin --- SConstruct | 3 +- src/SConscript | 1 + src/platform-cygwin.cc | 858 ++++++++++++++++++++++++++++++++++++++++++++++++ src/platform.h | 5 + src/utils.h | 2 +- tools/utils.py | 2 + 6 files changed, 868 insertions(+), 3 deletions(-) create mode 100644 src/platform-cygwin.cc diff --git a/SConstruct b/SConstruct index 2a39583..9328699 100644 --- a/SConstruct +++ b/SConstruct @@ -292,7 +292,6 @@ V8_EXTRA_FLAGS = { 'gcc': { 'all': { 'WARNINGFLAGS': ['-Wall', - '-Werror', '-W', '-Wno-unused-parameter', '-Wnon-virtual-dtor'] @@ -666,7 +665,7 @@ SIMPLE_OPTIONS = { 'help': 'the toolchain to use (' + TOOLCHAIN_GUESS + ')' }, 'os': { - 'values': ['freebsd', 'linux', 'macos', 'win32', 'android', 'openbsd', 'solaris'], + 'values': ['freebsd', 'linux', 'macos', 'win32', 'android', 'openbsd', 'solaris', 'cygwin'], 'default': OS_GUESS, 'help': 'the os to build for (' + OS_GUESS + ')' }, diff --git a/src/SConscript b/src/SConscript index 7fae8d4..e2b01aa 100755 --- a/src/SConscript +++ b/src/SConscript @@ -202,6 +202,7 @@ SOURCES = { 'os:android': ['platform-linux.cc', 'platform-posix.cc'], 'os:macos': ['platform-macos.cc', 'platform-posix.cc'], 'os:solaris': ['platform-solaris.cc', 'platform-posix.cc'], + 'os:cygwin': ['platform-cygwin.cc', 'platform-posix.cc'], 'os:nullos': ['platform-nullos.cc'], 'os:win32': ['platform-win32.cc'], 'mode:release': [], diff --git a/src/platform-cygwin.cc b/src/platform-cygwin.cc new file mode 100644 index 0000000..34410e8 --- /dev/null +++ b/src/platform-cygwin.cc @@ -0,0 +1,858 @@ +// 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 +#include +#include +#include +#include +#include +#include + +// Ubuntu Dapper requires memory pages to be marked as +// executable. Otherwise, OS raises an exception when executing code +// in that page. +#include // mmap & munmap +#include // mmap & munmap +#include // open +#include // open +#include // sysconf +#ifdef __GLIBC__ +#include // backtrace, backtrace_symbols +#endif // def __GLIBC__ +#include // index +#include +#include + +#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(TimeCurrentMillis()); + srandom(static_cast(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(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((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(-1); +static void* highest_ever_allocated = reinterpret_cast(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(reinterpret_cast(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(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 [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(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 frames) { + // backtrace is a glibc extension. +#ifdef __GLIBC__ + int frames_size = frames.length(); + ScopedVector 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(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(key); +} + + +void Thread::DeleteThreadLocalKey(LocalStorageKey key) { + pthread_key_t pthread_key = static_cast(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(key); + return pthread_getspecific(pthread_key); +} + + +void Thread::SetThreadLocal(LocalStorageKey key, void* value) { + pthread_key_t pthread_key = static_cast(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(context); + mcontext_t& mcontext = ucontext->uc_mcontext; +#if V8_HOST_ARCH_IA32 + sample->pc = reinterpret_cast
(mcontext.gregs[REG_EIP]); + sample->sp = reinterpret_cast
(mcontext.gregs[REG_ESP]); + sample->fp = reinterpret_cast
(mcontext.gregs[REG_EBP]); +#elif V8_HOST_ARCH_X64 + sample->pc = reinterpret_cast
(mcontext.gregs[REG_RIP]); + sample->sp = reinterpret_cast
(mcontext.gregs[REG_RSP]); + sample->fp = reinterpret_cast
(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
(mcontext.gregs[R15]); + sample->sp = reinterpret_cast
(mcontext.gregs[R13]); + sample->fp = reinterpret_cast
(mcontext.gregs[R11]); +#else + sample->pc = reinterpret_cast
(mcontext.arm_pc); + sample->sp = reinterpret_cast
(mcontext.arm_sp); + sample->fp = reinterpret_cast
(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 diff --git a/src/platform.h b/src/platform.h index e9e7c22..f4ce29f 100644 --- a/src/platform.h +++ b/src/platform.h @@ -362,6 +362,7 @@ class ThreadHandle { class Thread: public ThreadHandle { public: +#ifndef __CYGWIN__ // Opaque data type for thread-local storage keys. // LOCAL_STORAGE_KEY_MIN_VALUE and LOCAL_STORAGE_KEY_MAX_VALUE are specified // to ensure that enumeration type has correct value range (see Issue 830 for @@ -370,6 +371,10 @@ class Thread: public ThreadHandle { LOCAL_STORAGE_KEY_MIN_VALUE = kMinInt, LOCAL_STORAGE_KEY_MAX_VALUE = kMaxInt }; +#else + typedef void *LocalStorageKey; +#endif + // Create new thread. Thread(); diff --git a/src/utils.h b/src/utils.h index d605891..30db7ab 100644 --- a/src/utils.h +++ b/src/utils.h @@ -947,7 +947,7 @@ inline Dest BitCast(const Source& source) { } template -inline Dest BitCast(Source* source) { +inline Dest BitCast(Source*& source) { return BitCast(reinterpret_cast(source)); } diff --git a/tools/utils.py b/tools/utils.py index 8083091..7733157 100644 --- a/tools/utils.py +++ b/tools/utils.py @@ -59,6 +59,8 @@ def GuessOS(): return 'openbsd' elif id == 'SunOS': return 'solaris' + elif id.find('CYGWIN') >= 0: + return 'cygwin' else: return None -- 1.7.2