// 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. #ifndef V8_LOG_H_ #define V8_LOG_H_ #include "allocation.h" #include "objects.h" #include "platform.h" #include "log-utils.h" namespace v8 { namespace internal { // Logger is used for collecting logging information from V8 during // execution. The result is dumped to a file. // // Available command line flags: // // --log // Minimal logging (no API, code, or GC sample events), default is off. // // --log-all // Log all events to the file, default is off. This is the same as combining // --log-api, --log-code, --log-gc, and --log-regexp. // // --log-api // Log API events to the logfile, default is off. --log-api implies --log. // // --log-code // Log code (create, move, and delete) events to the logfile, default is off. // --log-code implies --log. // // --log-gc // Log GC heap samples after each GC that can be processed by hp2ps, default // is off. --log-gc implies --log. // // --log-regexp // Log creation and use of regular expressions, Default is off. // --log-regexp implies --log. // // --logfile // Specify the name of the logfile, default is "v8.log". // // --prof // Collect statistical profiling information (ticks), default is off. The // tick profiler requires code events, so --prof implies --log-code. // Forward declarations. class LogMessageBuilder; class Profiler; class Semaphore; class SlidingStateWindow; class Ticker; #undef LOG #define LOG(isolate, Call) \ do { \ v8::internal::Logger* logger = \ (isolate)->logger(); \ if (logger->is_logging()) \ logger->Call; \ } while (false) #define LOG_EVENTS_AND_TAGS_LIST(V) \ V(CODE_CREATION_EVENT, "code-creation") \ V(CODE_MOVE_EVENT, "code-move") \ V(CODE_DELETE_EVENT, "code-delete") \ V(CODE_MOVING_GC, "code-moving-gc") \ V(SHARED_FUNC_MOVE_EVENT, "sfi-move") \ V(SNAPSHOT_POSITION_EVENT, "snapshot-pos") \ V(SNAPSHOT_CODE_NAME_EVENT, "snapshot-code-name") \ V(TICK_EVENT, "tick") \ V(REPEAT_META_EVENT, "repeat") \ V(BUILTIN_TAG, "Builtin") \ V(CALL_DEBUG_BREAK_TAG, "CallDebugBreak") \ V(CALL_DEBUG_PREPARE_STEP_IN_TAG, "CallDebugPrepareStepIn") \ V(CALL_IC_TAG, "CallIC") \ V(CALL_INITIALIZE_TAG, "CallInitialize") \ V(CALL_MEGAMORPHIC_TAG, "CallMegamorphic") \ V(CALL_MISS_TAG, "CallMiss") \ V(CALL_NORMAL_TAG, "CallNormal") \ V(CALL_PRE_MONOMORPHIC_TAG, "CallPreMonomorphic") \ V(KEYED_CALL_DEBUG_BREAK_TAG, "KeyedCallDebugBreak") \ V(KEYED_CALL_DEBUG_PREPARE_STEP_IN_TAG, \ "KeyedCallDebugPrepareStepIn") \ V(KEYED_CALL_IC_TAG, "KeyedCallIC") \ V(KEYED_CALL_INITIALIZE_TAG, "KeyedCallInitialize") \ V(KEYED_CALL_MEGAMORPHIC_TAG, "KeyedCallMegamorphic") \ V(KEYED_CALL_MISS_TAG, "KeyedCallMiss") \ V(KEYED_CALL_NORMAL_TAG, "KeyedCallNormal") \ V(KEYED_CALL_PRE_MONOMORPHIC_TAG, "KeyedCallPreMonomorphic") \ V(CALLBACK_TAG, "Callback") \ V(EVAL_TAG, "Eval") \ V(FUNCTION_TAG, "Function") \ V(KEYED_LOAD_IC_TAG, "KeyedLoadIC") \ V(KEYED_LOAD_MEGAMORPHIC_IC_TAG, "KeyedLoadMegamorphicIC") \ V(KEYED_EXTERNAL_ARRAY_LOAD_IC_TAG, "KeyedExternalArrayLoadIC") \ V(KEYED_STORE_IC_TAG, "KeyedStoreIC") \ V(KEYED_STORE_MEGAMORPHIC_IC_TAG, "KeyedStoreMegamorphicIC") \ V(KEYED_EXTERNAL_ARRAY_STORE_IC_TAG, "KeyedExternalArrayStoreIC") \ V(LAZY_COMPILE_TAG, "LazyCompile") \ V(LOAD_IC_TAG, "LoadIC") \ V(REG_EXP_TAG, "RegExp") \ V(SCRIPT_TAG, "Script") \ V(STORE_IC_TAG, "StoreIC") \ V(STUB_TAG, "Stub") \ V(NATIVE_FUNCTION_TAG, "Function") \ V(NATIVE_LAZY_COMPILE_TAG, "LazyCompile") \ V(NATIVE_SCRIPT_TAG, "Script") // Note that 'NATIVE_' cases for functions and scripts are mapped onto // original tags when writing to the log. class Sampler; class Logger { public: #define DECLARE_ENUM(enum_item, ignore) enum_item, enum LogEventsAndTags { LOG_EVENTS_AND_TAGS_LIST(DECLARE_ENUM) NUMBER_OF_LOG_EVENTS }; #undef DECLARE_ENUM // Acquires resources for logging if the right flags are set. bool SetUp(); void EnsureTickerStarted(); void EnsureTickerStopped(); Sampler* sampler(); // Frees resources acquired in SetUp. // When a temporary file is used for the log, returns its stream descriptor, // leaving the file open. FILE* TearDown(); // Enable the computation of a sliding window of states. void EnableSlidingStateWindow(); // Emits an event with a string value -> (name, value). void StringEvent(const char* name, const char* value); // Emits an event with an int value -> (name, value). void IntEvent(const char* name, int value); void IntPtrTEvent(const char* name, intptr_t value); // Emits an event with an handle value -> (name, location). void HandleEvent(const char* name, Object** location); // Emits memory management events for C allocated structures. void NewEvent(const char* name, void* object, size_t size); void DeleteEvent(const char* name, void* object); // Static versions of the above, operate on current isolate's logger. // Used in TRACK_MEMORY(TypeName) defined in globals.h static void NewEventStatic(const char* name, void* object, size_t size); static void DeleteEventStatic(const char* name, void* object); // Emits an event with a tag, and some resource usage information. // -> (name, tag, ). // Currently, the resource usage information is a process time stamp // and a real time timestamp. void ResourceEvent(const char* name, const char* tag); // Emits an event that an undefined property was read from an // object. void SuspectReadEvent(String* name, Object* obj); // Emits an event when a message is put on or read from a debugging queue. // DebugTag lets us put a call-site specific label on the event. void DebugTag(const char* call_site_tag); void DebugEvent(const char* event_type, Vector parameter); // ==== Events logged by --log-api. ==== void ApiNamedSecurityCheck(Object* key); void ApiIndexedSecurityCheck(uint32_t index); void ApiNamedPropertyAccess(const char* tag, JSObject* holder, Object* name); void ApiIndexedPropertyAccess(const char* tag, JSObject* holder, uint32_t index); void ApiObjectAccess(const char* tag, JSObject* obj); void ApiEntryCall(const char* name); // ==== Events logged by --log-code. ==== // Emits a code event for a callback function. void CallbackEvent(String* name, Address entry_point); void GetterCallbackEvent(String* name, Address entry_point); void SetterCallbackEvent(String* name, Address entry_point); // Emits a code create event. void CodeCreateEvent(LogEventsAndTags tag, Code* code, const char* source); void CodeCreateEvent(LogEventsAndTags tag, Code* code, String* name); void CodeCreateEvent(LogEventsAndTags tag, Code* code, SharedFunctionInfo* shared, String* name); void CodeCreateEvent(LogEventsAndTags tag, Code* code, SharedFunctionInfo* shared, String* source, int line); void CodeCreateEvent(LogEventsAndTags tag, Code* code, int args_count); void CodeMovingGCEvent(); // Emits a code create event for a RegExp. void RegExpCodeCreateEvent(Code* code, String* source); // Emits a code move event. void CodeMoveEvent(Address from, Address to); // Emits a code delete event. void CodeDeleteEvent(Address from); void SharedFunctionInfoMoveEvent(Address from, Address to); void SnapshotPositionEvent(Address addr, int pos); // ==== Events logged by --log-gc. ==== // Heap sampling events: start, end, and individual types. void HeapSampleBeginEvent(const char* space, const char* kind); void HeapSampleEndEvent(const char* space, const char* kind); void HeapSampleItemEvent(const char* type, int number, int bytes); void HeapSampleJSConstructorEvent(const char* constructor, int number, int bytes); void HeapSampleJSRetainersEvent(const char* constructor, const char* event); void HeapSampleJSProducerEvent(const char* constructor, Address* stack); void HeapSampleStats(const char* space, const char* kind, intptr_t capacity, intptr_t used); void SharedLibraryEvent(const char* library_path, uintptr_t start, uintptr_t end); void SharedLibraryEvent(const wchar_t* library_path, uintptr_t start, uintptr_t end); // ==== Events logged by --log-regexp ==== // Regexp compilation and execution events. void RegExpCompileEvent(Handle regexp, bool in_cache); // Log an event reported from generated code void LogRuntime(Vector format, JSArray* args); bool is_logging() { return logging_nesting_ > 0; } // Pause/Resume collection of profiling data. // When data collection is paused, CPU Tick events are discarded until // data collection is Resumed. void PauseProfiler(); void ResumeProfiler(); bool IsProfilerPaused(); void LogExistingFunction(Handle shared, Handle code); // Logs all compiled functions found in the heap. void LogCompiledFunctions(); // Logs all accessor callbacks found in the heap. void LogAccessorCallbacks(); // Used for logging stubs found in the snapshot. void LogCodeObjects(); // Converts tag to a corresponding NATIVE_... if the script is native. INLINE(static LogEventsAndTags ToNativeByScript(LogEventsAndTags, Script*)); // Profiler's sampling interval (in milliseconds). #if defined(ANDROID) // Phones and tablets have processors that are much slower than desktop // and laptop computers for which current heuristics are tuned. static const int kSamplingIntervalMs = 5; #else static const int kSamplingIntervalMs = 1; #endif // Callback from Log, stops profiling in case of insufficient resources. void LogFailure(); private: class NameBuffer; class NameMap; Logger(); ~Logger(); // Emits the profiler's first message. void ProfilerBeginEvent(); // Emits callback event messages. void CallbackEventInternal(const char* prefix, const char* name, Address entry_point); // Internal configurable move event. void MoveEventInternal(LogEventsAndTags event, Address from, Address to); // Internal configurable move event. void DeleteEventInternal(LogEventsAndTags event, Address from); // Emits the source code of a regexp. Used by regexp events. void LogRegExpSource(Handle regexp); // Used for logging stubs found in the snapshot. void LogCodeObject(Object* code_object); // Emits general information about generated code. void LogCodeInfo(); void RegisterSnapshotCodeName(Code* code, const char* name, int name_size); // Low-level logging support. void LowLevelCodeCreateEvent(Code* code, const char* name, int name_size); void LowLevelCodeMoveEvent(Address from, Address to); void LowLevelCodeDeleteEvent(Address from); void LowLevelSnapshotPositionEvent(Address addr, int pos); void LowLevelLogWriteBytes(const char* bytes, int size); template void LowLevelLogWriteStruct(const T& s) { char tag = T::kTag; LowLevelLogWriteBytes(reinterpret_cast(&tag), sizeof(tag)); LowLevelLogWriteBytes(reinterpret_cast(&s), sizeof(s)); } // Emits a profiler tick event. Used by the profiler thread. void TickEvent(TickSample* sample, bool overflow); void ApiEvent(const char* name, ...); // Logs a StringEvent regardless of whether FLAG_log is true. void UncheckedStringEvent(const char* name, const char* value); // Logs an IntEvent regardless of whether FLAG_log is true. void UncheckedIntEvent(const char* name, int value); void UncheckedIntPtrTEvent(const char* name, intptr_t value); // Returns whether profiler's sampler is active. bool IsProfilerSamplerActive(); // The sampler used by the profiler and the sliding state window. Ticker* ticker_; // When the statistical profile is active, profiler_ // points to a Profiler, that handles collection // of samples. Profiler* profiler_; // SlidingStateWindow instance keeping a sliding window of the most // recent VM states. SlidingStateWindow* sliding_state_window_; // An array of log events names. const char* const* log_events_; // Internal implementation classes with access to // private members. friend class EventLog; friend class Isolate; friend class LogMessageBuilder; friend class TimeLog; friend class Profiler; friend class SlidingStateWindow; friend class StackTracer; friend class VMState; friend class LoggerTestHelper; int logging_nesting_; int cpu_profiler_nesting_; Log* log_; NameBuffer* name_buffer_; NameMap* address_to_name_map_; // Guards against multiple calls to TearDown() that can happen in some tests. // 'true' between SetUp() and TearDown(). bool is_initialized_; // Support for 'incremental addresses' in compressed logs: // LogMessageBuilder::AppendAddress(Address addr) Address last_address_; // Logger::TickEvent(...) Address prev_sp_; Address prev_function_; // Logger::MoveEventInternal(...) Address prev_to_; // Logger::FunctionCreateEvent(...) Address prev_code_; friend class CpuProfiler; }; // Process wide registry of samplers. class SamplerRegistry : public AllStatic { public: enum State { HAS_NO_SAMPLERS, HAS_SAMPLERS, HAS_CPU_PROFILING_SAMPLERS }; static void SetUp(); typedef void (*VisitSampler)(Sampler*, void*); static State GetState(); // Iterates over all active samplers keeping the internal lock held. // Returns whether there are any active samplers. static bool IterateActiveSamplers(VisitSampler func, void* param); // Adds/Removes an active sampler. static void AddActiveSampler(Sampler* sampler); static void RemoveActiveSampler(Sampler* sampler); private: static bool ActiveSamplersExist() { return active_samplers_ != NULL && !active_samplers_->is_empty(); } static List* active_samplers_; DISALLOW_IMPLICIT_CONSTRUCTORS(SamplerRegistry); }; // Class that extracts stack trace, used for profiling. class StackTracer : public AllStatic { public: static void Trace(Isolate* isolate, TickSample* sample); }; } } // namespace v8::internal #endif // V8_LOG_H_