| // Copyright 2012 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. |
| |
| // This module contains the platform-specific code. This make the rest of the |
| // code less dependent on operating system, compilers and runtime libraries. |
| // This module does specifically not deal with differences between different |
| // processor architecture. |
| // The platform classes have the same definition for all platforms. The |
| // implementation for a particular platform is put in platform_<os>.cc. |
| // The build system then uses the implementation for the target platform. |
| // |
| // This design has been chosen because it is simple and fast. Alternatively, |
| // the platform dependent classes could have been implemented using abstract |
| // superclasses with virtual methods and having specializations for each |
| // platform. This design was rejected because it was more complicated and |
| // slower. It would require factory methods for selecting the right |
| // implementation and the overhead of virtual methods for performance |
| // sensitive like mutex locking/unlocking. |
| |
| #ifndef V8_PLATFORM_H_ |
| #define V8_PLATFORM_H_ |
| |
| #ifdef __sun |
| # ifndef signbit |
| int signbit(double x); |
| # endif |
| #endif |
| |
| // GCC specific stuff |
| #ifdef __GNUC__ |
| |
| // Needed for va_list on at least MinGW and Android. |
| #include <stdarg.h> |
| |
| #define __GNUC_VERSION__ (__GNUC__ * 10000 + __GNUC_MINOR__ * 100) |
| |
| #endif // __GNUC__ |
| |
| |
| // Windows specific stuff. |
| #ifdef WIN32 |
| |
| // Microsoft Visual C++ specific stuff. |
| #ifdef _MSC_VER |
| |
| #include "win32-math.h" |
| |
| int strncasecmp(const char* s1, const char* s2, int n); |
| |
| inline int lrint(double flt) { |
| int intgr; |
| #if defined(V8_TARGET_ARCH_IA32) |
| __asm { |
| fld flt |
| fistp intgr |
| }; |
| #else |
| intgr = static_cast<int>(flt + 0.5); |
| if ((intgr & 1) != 0 && intgr - flt == 0.5) { |
| // If the number is halfway between two integers, round to the even one. |
| intgr--; |
| } |
| #endif |
| return intgr; |
| } |
| |
| |
| #endif // _MSC_VER |
| |
| // Random is missing on both Visual Studio and MinGW. |
| int random(); |
| |
| #endif // WIN32 |
| |
| #include "atomicops.h" |
| #include "lazy-instance.h" |
| #include "platform-tls.h" |
| #include "utils.h" |
| #include "v8globals.h" |
| |
| namespace v8 { |
| namespace internal { |
| |
| // Use AtomicWord for a machine-sized pointer. It is assumed that |
| // reads and writes of naturally aligned values of this type are atomic. |
| #if defined(__OpenBSD__) && defined(__i386__) |
| typedef Atomic32 AtomicWord; |
| #else |
| typedef intptr_t AtomicWord; |
| #endif |
| |
| class Semaphore; |
| class Mutex; |
| |
| double ceiling(double x); |
| double modulo(double x, double y); |
| |
| // Custom implementation of math functions. |
| double fast_sin(double input); |
| double fast_cos(double input); |
| double fast_tan(double input); |
| double fast_log(double input); |
| double fast_exp(double input); |
| double fast_sqrt(double input); |
| // The custom exp implementation needs 16KB of lookup data; initialize it |
| // on demand. |
| void lazily_initialize_fast_exp(); |
| |
| // Forward declarations. |
| class Socket; |
| |
| // ---------------------------------------------------------------------------- |
| // OS |
| // |
| // This class has static methods for the different platform specific |
| // functions. Add methods here to cope with differences between the |
| // supported platforms. |
| |
| class OS { |
| public: |
| // Initializes the platform OS support. Called once at VM startup. |
| static void SetUp(); |
| |
| // Initializes the platform OS support that depend on CPU features. This is |
| // called after CPU initialization. |
| static void PostSetUp(); |
| |
| // Clean up platform-OS-related things. Called once at VM shutdown. |
| static void TearDown(); |
| |
| // Returns the accumulated user time for thread. This routine |
| // can be used for profiling. The implementation should |
| // strive for high-precision timer resolution, preferable |
| // micro-second resolution. |
| static int GetUserTime(uint32_t* secs, uint32_t* usecs); |
| |
| // Get a tick counter normalized to one tick per microsecond. |
| // Used for calculating time intervals. |
| static int64_t Ticks(); |
| |
| // Returns current time as the number of milliseconds since |
| // 00:00:00 UTC, January 1, 1970. |
| static double TimeCurrentMillis(); |
| |
| // Returns a string identifying the current time zone. The |
| // timestamp is used for determining if DST is in effect. |
| static const char* LocalTimezone(double time); |
| |
| // Returns the local time offset in milliseconds east of UTC without |
| // taking daylight savings time into account. |
| static double LocalTimeOffset(); |
| |
| // Returns the daylight savings offset for the given time. |
| static double DaylightSavingsOffset(double time); |
| |
| // Returns last OS error. |
| static int GetLastError(); |
| |
| static FILE* FOpen(const char* path, const char* mode); |
| static bool Remove(const char* path); |
| |
| // Opens a temporary file, the file is auto removed on close. |
| static FILE* OpenTemporaryFile(); |
| |
| // Log file open mode is platform-dependent due to line ends issues. |
| static const char* const LogFileOpenMode; |
| |
| // Print output to console. This is mostly used for debugging output. |
| // On platforms that has standard terminal output, the output |
| // should go to stdout. |
| static void Print(const char* format, ...); |
| static void VPrint(const char* format, va_list args); |
| |
| // Print output to a file. This is mostly used for debugging output. |
| static void FPrint(FILE* out, const char* format, ...); |
| static void VFPrint(FILE* out, const char* format, va_list args); |
| |
| // Print error output to console. This is mostly used for error message |
| // output. On platforms that has standard terminal output, the output |
| // should go to stderr. |
| static void PrintError(const char* format, ...); |
| static void VPrintError(const char* format, va_list args); |
| |
| // Allocate/Free memory used by JS heap. Pages are readable/writable, but |
| // they are not guaranteed to be executable unless 'executable' is true. |
| // Returns the address of allocated memory, or NULL if failed. |
| static void* Allocate(const size_t requested, |
| size_t* allocated, |
| bool is_executable); |
| static void Free(void* address, const size_t size); |
| |
| // This is the granularity at which the ProtectCode(...) call can set page |
| // permissions. |
| static intptr_t CommitPageSize(); |
| |
| // Mark code segments non-writable. |
| static void ProtectCode(void* address, const size_t size); |
| |
| // Assign memory as a guard page so that access will cause an exception. |
| static void Guard(void* address, const size_t size); |
| |
| // Generate a random address to be used for hinting mmap(). |
| static void* GetRandomMmapAddr(); |
| |
| // Get the Alignment guaranteed by Allocate(). |
| static size_t AllocateAlignment(); |
| |
| // Returns an indication of whether a pointer is in a space that |
| // has been allocated by Allocate(). This method may conservatively |
| // always return false, but giving more accurate information may |
| // improve the robustness of the stack dump code in the presence of |
| // heap corruption. |
| static bool IsOutsideAllocatedSpace(void* pointer); |
| |
| // Sleep for a number of milliseconds. |
| static void Sleep(const int milliseconds); |
| |
| static int NumberOfCores(); |
| |
| // Abort the current process. |
| static void Abort(); |
| |
| // Debug break. |
| static void DebugBreak(); |
| |
| // Dump C++ current stack trace (only functional on Linux). |
| static void DumpBacktrace(); |
| |
| // Walk the stack. |
| static const int kStackWalkError = -1; |
| static const int kStackWalkMaxNameLen = 256; |
| static const int kStackWalkMaxTextLen = 256; |
| struct StackFrame { |
| void* address; |
| char text[kStackWalkMaxTextLen]; |
| }; |
| |
| static int StackWalk(Vector<StackFrame> frames); |
| |
| // Factory method for creating platform dependent Mutex. |
| // Please use delete to reclaim the storage for the returned Mutex. |
| static Mutex* CreateMutex(); |
| |
| // Factory method for creating platform dependent Semaphore. |
| // Please use delete to reclaim the storage for the returned Semaphore. |
| static Semaphore* CreateSemaphore(int count); |
| |
| // Factory method for creating platform dependent Socket. |
| // Please use delete to reclaim the storage for the returned Socket. |
| static Socket* CreateSocket(); |
| |
| class MemoryMappedFile { |
| public: |
| static MemoryMappedFile* open(const char* name); |
| static MemoryMappedFile* create(const char* name, int size, void* initial); |
| virtual ~MemoryMappedFile() { } |
| virtual void* memory() = 0; |
| virtual int size() = 0; |
| }; |
| |
| // Safe formatting print. Ensures that str is always null-terminated. |
| // Returns the number of chars written, or -1 if output was truncated. |
| static int SNPrintF(Vector<char> str, const char* format, ...); |
| static int VSNPrintF(Vector<char> str, |
| const char* format, |
| va_list args); |
| |
| static char* StrChr(char* str, int c); |
| static void StrNCpy(Vector<char> dest, const char* src, size_t n); |
| |
| // Support for the profiler. Can do nothing, in which case ticks |
| // occuring in shared libraries will not be properly accounted for. |
| static void LogSharedLibraryAddresses(); |
| |
| // Support for the profiler. Notifies the external profiling |
| // process that a code moving garbage collection starts. Can do |
| // nothing, in which case the code objects must not move (e.g., by |
| // using --never-compact) if accurate profiling is desired. |
| static void SignalCodeMovingGC(); |
| |
| // The return value indicates the CPU features we are sure of because of the |
| // OS. For example MacOSX doesn't run on any x86 CPUs that don't have SSE2 |
| // instructions. |
| // This is a little messy because the interpretation is subject to the cross |
| // of the CPU and the OS. The bits in the answer correspond to the bit |
| // positions indicated by the members of the CpuFeature enum from globals.h |
| static uint64_t CpuFeaturesImpliedByPlatform(); |
| |
| // Maximum size of the virtual memory. 0 means there is no artificial |
| // limit. |
| static intptr_t MaxVirtualMemory(); |
| |
| // Returns the double constant NAN |
| static double nan_value(); |
| |
| // Support runtime detection of Cpu implementer |
| static CpuImplementer GetCpuImplementer(); |
| |
| // Support runtime detection of VFP3 on ARM CPUs. |
| static bool ArmCpuHasFeature(CpuFeature feature); |
| |
| // Support runtime detection of whether the hard float option of the |
| // EABI is used. |
| static bool ArmUsingHardFloat(); |
| |
| // Support runtime detection of FPU on MIPS CPUs. |
| static bool MipsCpuHasFeature(CpuFeature feature); |
| |
| // Returns the activation frame alignment constraint or zero if |
| // the platform doesn't care. Guaranteed to be a power of two. |
| static int ActivationFrameAlignment(); |
| |
| static void ReleaseStore(volatile AtomicWord* ptr, AtomicWord value); |
| |
| #if defined(V8_TARGET_ARCH_IA32) |
| // Copy memory area to disjoint memory area. |
| static void MemCopy(void* dest, const void* src, size_t size); |
| // Limit below which the extra overhead of the MemCopy function is likely |
| // to outweigh the benefits of faster copying. |
| static const int kMinComplexMemCopy = 64; |
| typedef void (*MemCopyFunction)(void* dest, const void* src, size_t size); |
| |
| #else // V8_TARGET_ARCH_IA32 |
| static void MemCopy(void* dest, const void* src, size_t size) { |
| memcpy(dest, src, size); |
| } |
| static const int kMinComplexMemCopy = 256; |
| #endif // V8_TARGET_ARCH_IA32 |
| |
| static int GetCurrentProcessId(); |
| |
| private: |
| static const int msPerSecond = 1000; |
| |
| DISALLOW_IMPLICIT_CONSTRUCTORS(OS); |
| }; |
| |
| // Represents and controls an area of reserved memory. |
| // Control of the reserved memory can be assigned to another VirtualMemory |
| // object by assignment or copy-contructing. This removes the reserved memory |
| // from the original object. |
| class VirtualMemory { |
| public: |
| // Empty VirtualMemory object, controlling no reserved memory. |
| VirtualMemory(); |
| |
| // Reserves virtual memory with size. |
| explicit VirtualMemory(size_t size); |
| |
| // Reserves virtual memory containing an area of the given size that |
| // is aligned per alignment. This may not be at the position returned |
| // by address(). |
| VirtualMemory(size_t size, size_t alignment); |
| |
| // Releases the reserved memory, if any, controlled by this VirtualMemory |
| // object. |
| ~VirtualMemory(); |
| |
| // Returns whether the memory has been reserved. |
| bool IsReserved(); |
| |
| // Initialize or resets an embedded VirtualMemory object. |
| void Reset(); |
| |
| // Returns the start address of the reserved memory. |
| // If the memory was reserved with an alignment, this address is not |
| // necessarily aligned. The user might need to round it up to a multiple of |
| // the alignment to get the start of the aligned block. |
| void* address() { |
| ASSERT(IsReserved()); |
| return address_; |
| } |
| |
| // Returns the size of the reserved memory. The returned value is only |
| // meaningful when IsReserved() returns true. |
| // If the memory was reserved with an alignment, this size may be larger |
| // than the requested size. |
| size_t size() { return size_; } |
| |
| // Commits real memory. Returns whether the operation succeeded. |
| bool Commit(void* address, size_t size, bool is_executable); |
| |
| // Uncommit real memory. Returns whether the operation succeeded. |
| bool Uncommit(void* address, size_t size); |
| |
| // Creates a single guard page at the given address. |
| bool Guard(void* address); |
| |
| void Release() { |
| ASSERT(IsReserved()); |
| // Notice: Order is important here. The VirtualMemory object might live |
| // inside the allocated region. |
| void* address = address_; |
| size_t size = size_; |
| Reset(); |
| bool result = ReleaseRegion(address, size); |
| USE(result); |
| ASSERT(result); |
| } |
| |
| // Assign control of the reserved region to a different VirtualMemory object. |
| // The old object is no longer functional (IsReserved() returns false). |
| void TakeControl(VirtualMemory* from) { |
| ASSERT(!IsReserved()); |
| address_ = from->address_; |
| size_ = from->size_; |
| from->Reset(); |
| } |
| |
| static void* ReserveRegion(size_t size); |
| |
| static bool CommitRegion(void* base, size_t size, bool is_executable); |
| |
| static bool UncommitRegion(void* base, size_t size); |
| |
| // Must be called with a base pointer that has been returned by ReserveRegion |
| // and the same size it was reserved with. |
| static bool ReleaseRegion(void* base, size_t size); |
| |
| // Returns true if OS performs lazy commits, i.e. the memory allocation call |
| // defers actual physical memory allocation till the first memory access. |
| // Otherwise returns false. |
| static bool HasLazyCommits(); |
| |
| private: |
| void* address_; // Start address of the virtual memory. |
| size_t size_; // Size of the virtual memory. |
| }; |
| |
| |
| // ---------------------------------------------------------------------------- |
| // Thread |
| // |
| // Thread objects are used for creating and running threads. When the start() |
| // method is called the new thread starts running the run() method in the new |
| // thread. The Thread object should not be deallocated before the thread has |
| // terminated. |
| |
| class Thread { |
| public: |
| // 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 |
| // more details). |
| enum LocalStorageKey { |
| LOCAL_STORAGE_KEY_MIN_VALUE = kMinInt, |
| LOCAL_STORAGE_KEY_MAX_VALUE = kMaxInt |
| }; |
| |
| class Options { |
| public: |
| Options() : name_("v8:<unknown>"), stack_size_(0) {} |
| Options(const char* name, int stack_size = 0) |
| : name_(name), stack_size_(stack_size) {} |
| |
| const char* name() const { return name_; } |
| int stack_size() const { return stack_size_; } |
| |
| private: |
| const char* name_; |
| int stack_size_; |
| }; |
| |
| // Create new thread. |
| explicit Thread(const Options& options); |
| virtual ~Thread(); |
| |
| // Start new thread by calling the Run() method in the new thread. |
| void Start(); |
| |
| // Wait until thread terminates. |
| void Join(); |
| |
| inline const char* name() const { |
| return name_; |
| } |
| |
| // Abstract method for run handler. |
| virtual void Run() = 0; |
| |
| // Thread-local storage. |
| static LocalStorageKey CreateThreadLocalKey(); |
| static void DeleteThreadLocalKey(LocalStorageKey key); |
| static void* GetThreadLocal(LocalStorageKey key); |
| static int GetThreadLocalInt(LocalStorageKey key) { |
| return static_cast<int>(reinterpret_cast<intptr_t>(GetThreadLocal(key))); |
| } |
| static void SetThreadLocal(LocalStorageKey key, void* value); |
| static void SetThreadLocalInt(LocalStorageKey key, int value) { |
| SetThreadLocal(key, reinterpret_cast<void*>(static_cast<intptr_t>(value))); |
| } |
| static bool HasThreadLocal(LocalStorageKey key) { |
| return GetThreadLocal(key) != NULL; |
| } |
| |
| #ifdef V8_FAST_TLS_SUPPORTED |
| static inline void* GetExistingThreadLocal(LocalStorageKey key) { |
| void* result = reinterpret_cast<void*>( |
| InternalGetExistingThreadLocal(static_cast<intptr_t>(key))); |
| ASSERT(result == GetThreadLocal(key)); |
| return result; |
| } |
| #else |
| static inline void* GetExistingThreadLocal(LocalStorageKey key) { |
| return GetThreadLocal(key); |
| } |
| #endif |
| |
| // A hint to the scheduler to let another thread run. |
| static void YieldCPU(); |
| |
| |
| // The thread name length is limited to 16 based on Linux's implementation of |
| // prctl(). |
| static const int kMaxThreadNameLength = 16; |
| |
| class PlatformData; |
| PlatformData* data() { return data_; } |
| |
| private: |
| void set_name(const char* name); |
| |
| PlatformData* data_; |
| |
| char name_[kMaxThreadNameLength]; |
| int stack_size_; |
| |
| DISALLOW_COPY_AND_ASSIGN(Thread); |
| }; |
| |
| |
| // ---------------------------------------------------------------------------- |
| // Mutex |
| // |
| // Mutexes are used for serializing access to non-reentrant sections of code. |
| // The implementations of mutex should allow for nested/recursive locking. |
| |
| class Mutex { |
| public: |
| virtual ~Mutex() {} |
| |
| // Locks the given mutex. If the mutex is currently unlocked, it becomes |
| // locked and owned by the calling thread, and immediately. If the mutex |
| // is already locked by another thread, suspends the calling thread until |
| // the mutex is unlocked. |
| virtual int Lock() = 0; |
| |
| // Unlocks the given mutex. The mutex is assumed to be locked and owned by |
| // the calling thread on entrance. |
| virtual int Unlock() = 0; |
| |
| // Tries to lock the given mutex. Returns whether the mutex was |
| // successfully locked. |
| virtual bool TryLock() = 0; |
| }; |
| |
| struct CreateMutexTrait { |
| static Mutex* Create() { |
| return OS::CreateMutex(); |
| } |
| }; |
| |
| // POD Mutex initialized lazily (i.e. the first time Pointer() is called). |
| // Usage: |
| // static LazyMutex my_mutex = LAZY_MUTEX_INITIALIZER; |
| // |
| // void my_function() { |
| // ScopedLock my_lock(my_mutex.Pointer()); |
| // // Do something. |
| // } |
| // |
| typedef LazyDynamicInstance< |
| Mutex, CreateMutexTrait, ThreadSafeInitOnceTrait>::type LazyMutex; |
| |
| #define LAZY_MUTEX_INITIALIZER LAZY_DYNAMIC_INSTANCE_INITIALIZER |
| |
| // ---------------------------------------------------------------------------- |
| // ScopedLock |
| // |
| // Stack-allocated ScopedLocks provide block-scoped locking and |
| // unlocking of a mutex. |
| class ScopedLock { |
| public: |
| explicit ScopedLock(Mutex* mutex): mutex_(mutex) { |
| ASSERT(mutex_ != NULL); |
| mutex_->Lock(); |
| } |
| ~ScopedLock() { |
| mutex_->Unlock(); |
| } |
| |
| private: |
| Mutex* mutex_; |
| DISALLOW_COPY_AND_ASSIGN(ScopedLock); |
| }; |
| |
| |
| // ---------------------------------------------------------------------------- |
| // Semaphore |
| // |
| // A semaphore object is a synchronization object that maintains a count. The |
| // count is decremented each time a thread completes a wait for the semaphore |
| // object and incremented each time a thread signals the semaphore. When the |
| // count reaches zero, threads waiting for the semaphore blocks until the |
| // count becomes non-zero. |
| |
| class Semaphore { |
| public: |
| virtual ~Semaphore() {} |
| |
| // Suspends the calling thread until the semaphore counter is non zero |
| // and then decrements the semaphore counter. |
| virtual void Wait() = 0; |
| |
| // Suspends the calling thread until the counter is non zero or the timeout |
| // time has passed. If timeout happens the return value is false and the |
| // counter is unchanged. Otherwise the semaphore counter is decremented and |
| // true is returned. The timeout value is specified in microseconds. |
| virtual bool Wait(int timeout) = 0; |
| |
| // Increments the semaphore counter. |
| virtual void Signal() = 0; |
| }; |
| |
| template <int InitialValue> |
| struct CreateSemaphoreTrait { |
| static Semaphore* Create() { |
| return OS::CreateSemaphore(InitialValue); |
| } |
| }; |
| |
| // POD Semaphore initialized lazily (i.e. the first time Pointer() is called). |
| // Usage: |
| // // The following semaphore starts at 0. |
| // static LazySemaphore<0>::type my_semaphore = LAZY_SEMAPHORE_INITIALIZER; |
| // |
| // void my_function() { |
| // // Do something with my_semaphore.Pointer(). |
| // } |
| // |
| template <int InitialValue> |
| struct LazySemaphore { |
| typedef typename LazyDynamicInstance< |
| Semaphore, CreateSemaphoreTrait<InitialValue>, |
| ThreadSafeInitOnceTrait>::type type; |
| }; |
| |
| #define LAZY_SEMAPHORE_INITIALIZER LAZY_DYNAMIC_INSTANCE_INITIALIZER |
| |
| |
| // ---------------------------------------------------------------------------- |
| // Socket |
| // |
| |
| class Socket { |
| public: |
| virtual ~Socket() {} |
| |
| // Server initialization. |
| virtual bool Bind(const int port) = 0; |
| virtual bool Listen(int backlog) const = 0; |
| virtual Socket* Accept() const = 0; |
| |
| // Client initialization. |
| virtual bool Connect(const char* host, const char* port) = 0; |
| |
| // Shutdown socket for both read and write. This causes blocking Send and |
| // Receive calls to exit. After Shutdown the Socket object cannot be used for |
| // any communication. |
| virtual bool Shutdown() = 0; |
| |
| // Data Transimission |
| // Return 0 on failure. |
| virtual int Send(const char* data, int len) const = 0; |
| virtual int Receive(char* data, int len) const = 0; |
| |
| // Set the value of the SO_REUSEADDR socket option. |
| virtual bool SetReuseAddress(bool reuse_address) = 0; |
| |
| virtual bool IsValid() const = 0; |
| |
| static bool SetUp(); |
| static int LastError(); |
| static uint16_t HToN(uint16_t value); |
| static uint16_t NToH(uint16_t value); |
| static uint32_t HToN(uint32_t value); |
| static uint32_t NToH(uint32_t value); |
| }; |
| |
| |
| // ---------------------------------------------------------------------------- |
| // Sampler |
| // |
| // A sampler periodically samples the state of the VM and optionally |
| // (if used for profiling) the program counter and stack pointer for |
| // the thread that created it. |
| |
| // TickSample captures the information collected for each sample. |
| class TickSample { |
| public: |
| TickSample() |
| : state(OTHER), |
| pc(NULL), |
| sp(NULL), |
| fp(NULL), |
| tos(NULL), |
| frames_count(0), |
| has_external_callback(false) {} |
| StateTag state; // The state of the VM. |
| Address pc; // Instruction pointer. |
| Address sp; // Stack pointer. |
| Address fp; // Frame pointer. |
| union { |
| Address tos; // Top stack value (*sp). |
| Address external_callback; |
| }; |
| static const int kMaxFramesCount = 64; |
| Address stack[kMaxFramesCount]; // Call stack. |
| int frames_count : 8; // Number of captured frames. |
| bool has_external_callback : 1; |
| }; |
| |
| class Sampler { |
| public: |
| // Initialize sampler. |
| Sampler(Isolate* isolate, int interval); |
| virtual ~Sampler(); |
| |
| int interval() const { return interval_; } |
| |
| // Performs stack sampling. |
| void SampleStack(TickSample* sample) { |
| DoSampleStack(sample); |
| IncSamplesTaken(); |
| } |
| |
| // This method is called for each sampling period with the current |
| // program counter. |
| virtual void Tick(TickSample* sample) = 0; |
| |
| // Start and stop sampler. |
| void Start(); |
| void Stop(); |
| |
| // Is the sampler used for profiling? |
| bool IsProfiling() const { return NoBarrier_Load(&profiling_) > 0; } |
| void IncreaseProfilingDepth() { NoBarrier_AtomicIncrement(&profiling_, 1); } |
| void DecreaseProfilingDepth() { NoBarrier_AtomicIncrement(&profiling_, -1); } |
| |
| // Whether the sampler is running (that is, consumes resources). |
| bool IsActive() const { return NoBarrier_Load(&active_); } |
| |
| Isolate* isolate() { return isolate_; } |
| |
| // Used in tests to make sure that stack sampling is performed. |
| int samples_taken() const { return samples_taken_; } |
| void ResetSamplesTaken() { samples_taken_ = 0; } |
| |
| class PlatformData; |
| PlatformData* data() { return data_; } |
| |
| PlatformData* platform_data() { return data_; } |
| |
| protected: |
| virtual void DoSampleStack(TickSample* sample) = 0; |
| |
| private: |
| void SetActive(bool value) { NoBarrier_Store(&active_, value); } |
| void IncSamplesTaken() { if (++samples_taken_ < 0) samples_taken_ = 0; } |
| |
| Isolate* isolate_; |
| const int interval_; |
| Atomic32 profiling_; |
| Atomic32 active_; |
| PlatformData* data_; // Platform specific data. |
| int samples_taken_; // Counts stack samples taken. |
| DISALLOW_IMPLICIT_CONSTRUCTORS(Sampler); |
| }; |
| |
| |
| } } // namespace v8::internal |
| |
| #endif // V8_PLATFORM_H_ |