/* * Copyright (C) 2011 Google Inc. All rights reserved. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions * are met: * * 1. Redistributions of source code must retain the above copyright * notice, this list of conditions and the following disclaimer. * 2. 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. * * THIS SOFTWARE IS PROVIDED BY APPLE AND ITS 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 APPLE OR ITS 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. */ // Trace events are for tracking application performance and resource usage. // Macros are provided to track: // Begin and end of function calls // Counters // // Events are issued against categories. Whereas LOG's // categories are statically defined, TRACE categories are created // implicitly with a string. For example: // TRACE_EVENT_INSTANT0("MY_SUBSYSTEM", "SomeImportantEvent") // // Events can be INSTANT, or can be pairs of BEGIN and END in the same scope: // TRACE_EVENT_BEGIN0("MY_SUBSYSTEM", "SomethingCostly") // doSomethingCostly() // TRACE_EVENT_END0("MY_SUBSYSTEM", "SomethingCostly") // Note: our tools can't always determine the correct BEGIN/END pairs unless // these are used in the same scope. Use ASYNC_BEGIN/ASYNC_END macros if you need them // to be in separate scopes. // // A common use case is to trace entire function scopes. This // issues a trace BEGIN and END automatically: // void doSomethingCostly() { // TRACE_EVENT0("MY_SUBSYSTEM", "doSomethingCostly"); // ... // } // // Additional parameters can be associated with an event: // void doSomethingCostly2(int howMuch) { // TRACE_EVENT1("MY_SUBSYSTEM", "doSomethingCostly", // "howMuch", howMuch); // ... // } // // The trace system will automatically add to this information the // current process id, thread id, and a timestamp in microseconds. // // To trace an asynchronous procedure such as an IPC send/receive, use ASYNC_BEGIN and // ASYNC_END: // [single threaded sender code] // static int send_count = 0; // ++send_count; // TRACE_EVENT_ASYNC_BEGIN0("ipc", "message", send_count); // Send(new MyMessage(send_count)); // [receive code] // void OnMyMessage(send_count) { // TRACE_EVENT_ASYNC_END0("ipc", "message", send_count); // } // The third parameter is a unique ID to match ASYNC_BEGIN/ASYNC_END pairs. // ASYNC_BEGIN and ASYNC_END can occur on any thread of any traced process. Pointers can // be used for the ID parameter, and they will be mangled internally so that // the same pointer on two different processes will not match. For example: // class MyTracedClass { // public: // MyTracedClass() { // TRACE_EVENT_ASYNC_BEGIN0("category", "MyTracedClass", this); // } // ~MyTracedClass() { // TRACE_EVENT_ASYNC_END0("category", "MyTracedClass", this); // } // } // // Trace event also supports counters, which is a way to track a quantity // as it varies over time. Counters are created with the following macro: // TRACE_COUNTER1("MY_SUBSYSTEM", "myCounter", g_myCounterValue); // // Counters are process-specific. The macro itself can be issued from any // thread, however. // // Sometimes, you want to track two counters at once. You can do this with two // counter macros: // TRACE_COUNTER1("MY_SUBSYSTEM", "myCounter0", g_myCounterValue[0]); // TRACE_COUNTER1("MY_SUBSYSTEM", "myCounter1", g_myCounterValue[1]); // Or you can do it with a combined macro: // TRACE_COUNTER2("MY_SUBSYSTEM", "myCounter", // "bytesPinned", g_myCounterValue[0], // "bytesAllocated", g_myCounterValue[1]); // This indicates to the tracing UI that these counters should be displayed // in a single graph, as a summed area chart. // // Since counters are in a global namespace, you may want to disembiguate with a // unique ID, by using the TRACE_COUNTER_ID* variations. // // By default, trace collection is compiled in, but turned off at runtime. // Collecting trace data is the responsibility of the embedding // application. In Chrome's case, navigating to about:tracing will turn on // tracing and display data collected across all active processes. // // // Memory scoping note: // Tracing copies the pointers, not the string content, of the strings passed // in for category, name, and arg_names. Thus, the following code will // cause problems: // char* str = strdup("impprtantName"); // TRACE_EVENT_INSTANT0("SUBSYSTEM", str); // BAD! // free(str); // Trace system now has dangling pointer // // To avoid this issue with the |name| and |arg_name| parameters, use the // TRACE_EVENT_COPY_XXX overloads of the macros at additional runtime overhead. // Notes: The category must always be in a long-lived char* (i.e. static const). // The |arg_values|, when used, are always deep copied with the _COPY // macros. // // When are string argument values copied: // const char* arg_values are only referenced by default: // TRACE_EVENT1("category", "name", // "arg1", "literal string is only referenced"); // Use TRACE_STR_COPY to force copying of a const char*: // TRACE_EVENT1("category", "name", // "arg1", TRACE_STR_COPY("string will be copied")); // std::string arg_values are always copied: // TRACE_EVENT1("category", "name", // "arg1", std::string("string will be copied")); // // // Thread Safety: // A thread safe singleton and mutex are used for thread safety. Category // enabled flags are used to limit the performance impact when the system // is not enabled. // // TRACE_EVENT macros first cache a pointer to a category. The categories are // statically allocated and safe at all times, even after exit. Fetching a // category is protected by the TraceLog::lock_. Multiple threads initializing // the static variable is safe, as they will be serialized by the lock and // multiple calls will return the same pointer to the category. // // Then the category_enabled flag is checked. This is a unsigned char, and // not intended to be multithread safe. It optimizes access to addTraceEvent // which is threadsafe internally via TraceLog::lock_. The enabled flag may // cause some threads to incorrectly call or skip calling addTraceEvent near // the time of the system being enabled or disabled. This is acceptable as // we tolerate some data loss while the system is being enabled/disabled and // because addTraceEvent is threadsafe internally and checks the enabled state // again under lock. // // Without the use of these static category pointers and enabled flags all // trace points would carry a significant performance cost of aquiring a lock // and resolving the category. #ifndef TraceEvent_h #define TraceEvent_h #include "platform/EventTracer.h" #include "wtf/DynamicAnnotations.h" #include "wtf/text/CString.h" // By default, const char* argument values are assumed to have long-lived scope // and will not be copied. Use this macro to force a const char* to be copied. #define TRACE_STR_COPY(str) \ WebCore::TraceEvent::TraceStringWithCopy(str) // By default, uint64 ID argument values are not mangled with the Process ID in // TRACE_EVENT_ASYNC macros. Use this macro to force Process ID mangling. #define TRACE_ID_MANGLE(id) \ TraceID::ForceMangle(id) // By default, pointers are mangled with the Process ID in TRACE_EVENT_ASYNC // macros. Use this macro to prevent Process ID mangling. #define TRACE_ID_DONT_MANGLE(id) \ TraceID::DontMangle(id) // Records a pair of begin and end events called "name" for the current // scope, with 0, 1 or 2 associated arguments. If the category is not // enabled, then this does nothing. // - category and name strings must have application lifetime (statics or // literals). They may not include " chars. #define TRACE_EVENT0(category, name) \ INTERNAL_TRACE_EVENT_ADD_SCOPED(category, name) #define TRACE_EVENT1(category, name, arg1_name, arg1_val) \ INTERNAL_TRACE_EVENT_ADD_SCOPED(category, name, arg1_name, arg1_val) #define TRACE_EVENT2(category, name, arg1_name, arg1_val, arg2_name, arg2_val) \ INTERNAL_TRACE_EVENT_ADD_SCOPED(category, name, arg1_name, arg1_val, \ arg2_name, arg2_val) // Records a single event called "name" immediately, with 0, 1 or 2 // associated arguments. If the category is not enabled, then this // does nothing. // - category and name strings must have application lifetime (statics or // literals). They may not include " chars. #define TRACE_EVENT_INSTANT0(category, name) \ INTERNAL_TRACE_EVENT_ADD(TRACE_EVENT_PHASE_INSTANT, \ category, name, TRACE_EVENT_FLAG_NONE) #define TRACE_EVENT_INSTANT1(category, name, arg1_name, arg1_val) \ INTERNAL_TRACE_EVENT_ADD(TRACE_EVENT_PHASE_INSTANT, \ category, name, TRACE_EVENT_FLAG_NONE, arg1_name, arg1_val) #define TRACE_EVENT_INSTANT2(category, name, arg1_name, arg1_val, \ arg2_name, arg2_val) \ INTERNAL_TRACE_EVENT_ADD(TRACE_EVENT_PHASE_INSTANT, \ category, name, TRACE_EVENT_FLAG_NONE, arg1_name, arg1_val, \ arg2_name, arg2_val) #define TRACE_EVENT_COPY_INSTANT0(category, name) \ INTERNAL_TRACE_EVENT_ADD(TRACE_EVENT_PHASE_INSTANT, \ category, name, TRACE_EVENT_FLAG_COPY) #define TRACE_EVENT_COPY_INSTANT1(category, name, arg1_name, arg1_val) \ INTERNAL_TRACE_EVENT_ADD(TRACE_EVENT_PHASE_INSTANT, \ category, name, TRACE_EVENT_FLAG_COPY, arg1_name, arg1_val) #define TRACE_EVENT_COPY_INSTANT2(category, name, arg1_name, arg1_val, \ arg2_name, arg2_val) \ INTERNAL_TRACE_EVENT_ADD(TRACE_EVENT_PHASE_INSTANT, \ category, name, TRACE_EVENT_FLAG_COPY, arg1_name, arg1_val, \ arg2_name, arg2_val) // Records a single BEGIN event called "name" immediately, with 0, 1 or 2 // associated arguments. If the category is not enabled, then this // does nothing. // - category and name strings must have application lifetime (statics or // literals). They may not include " chars. #define TRACE_EVENT_BEGIN0(category, name) \ INTERNAL_TRACE_EVENT_ADD(TRACE_EVENT_PHASE_BEGIN, \ category, name, TRACE_EVENT_FLAG_NONE) #define TRACE_EVENT_BEGIN1(category, name, arg1_name, arg1_val) \ INTERNAL_TRACE_EVENT_ADD(TRACE_EVENT_PHASE_BEGIN, \ category, name, TRACE_EVENT_FLAG_NONE, arg1_name, arg1_val) #define TRACE_EVENT_BEGIN2(category, name, arg1_name, arg1_val, \ arg2_name, arg2_val) \ INTERNAL_TRACE_EVENT_ADD(TRACE_EVENT_PHASE_BEGIN, \ category, name, TRACE_EVENT_FLAG_NONE, arg1_name, arg1_val, \ arg2_name, arg2_val) #define TRACE_EVENT_COPY_BEGIN0(category, name) \ INTERNAL_TRACE_EVENT_ADD(TRACE_EVENT_PHASE_BEGIN, \ category, name, TRACE_EVENT_FLAG_COPY) #define TRACE_EVENT_COPY_BEGIN1(category, name, arg1_name, arg1_val) \ INTERNAL_TRACE_EVENT_ADD(TRACE_EVENT_PHASE_BEGIN, \ category, name, TRACE_EVENT_FLAG_COPY, arg1_name, arg1_val) #define TRACE_EVENT_COPY_BEGIN2(category, name, arg1_name, arg1_val, \ arg2_name, arg2_val) \ INTERNAL_TRACE_EVENT_ADD(TRACE_EVENT_PHASE_BEGIN, \ category, name, TRACE_EVENT_FLAG_COPY, arg1_name, arg1_val, \ arg2_name, arg2_val) // Records a single END event for "name" immediately. If the category // is not enabled, then this does nothing. // - category and name strings must have application lifetime (statics or // literals). They may not include " chars. #define TRACE_EVENT_END0(category, name) \ INTERNAL_TRACE_EVENT_ADD(TRACE_EVENT_PHASE_END, \ category, name, TRACE_EVENT_FLAG_NONE) #define TRACE_EVENT_END1(category, name, arg1_name, arg1_val) \ INTERNAL_TRACE_EVENT_ADD(TRACE_EVENT_PHASE_END, \ category, name, TRACE_EVENT_FLAG_NONE, arg1_name, arg1_val) #define TRACE_EVENT_END2(category, name, arg1_name, arg1_val, \ arg2_name, arg2_val) \ INTERNAL_TRACE_EVENT_ADD(TRACE_EVENT_PHASE_END, \ category, name, TRACE_EVENT_FLAG_NONE, arg1_name, arg1_val, \ arg2_name, arg2_val) #define TRACE_EVENT_COPY_END0(category, name) \ INTERNAL_TRACE_EVENT_ADD(TRACE_EVENT_PHASE_END, \ category, name, TRACE_EVENT_FLAG_COPY) #define TRACE_EVENT_COPY_END1(category, name, arg1_name, arg1_val) \ INTERNAL_TRACE_EVENT_ADD(TRACE_EVENT_PHASE_END, \ category, name, TRACE_EVENT_FLAG_COPY, arg1_name, arg1_val) #define TRACE_EVENT_COPY_END2(category, name, arg1_name, arg1_val, \ arg2_name, arg2_val) \ INTERNAL_TRACE_EVENT_ADD(TRACE_EVENT_PHASE_END, \ category, name, TRACE_EVENT_FLAG_COPY, arg1_name, arg1_val, \ arg2_name, arg2_val) // Records the value of a counter called "name" immediately. Value // must be representable as a 32 bit integer. // - category and name strings must have application lifetime (statics or // literals). They may not include " chars. #define TRACE_COUNTER1(category, name, value) \ INTERNAL_TRACE_EVENT_ADD(TRACE_EVENT_PHASE_COUNTER, \ category, name, TRACE_EVENT_FLAG_NONE, \ "value", static_cast(value)) #define TRACE_COPY_COUNTER1(category, name, value) \ INTERNAL_TRACE_EVENT_ADD(TRACE_EVENT_PHASE_COUNTER, \ category, name, TRACE_EVENT_FLAG_COPY, \ "value", static_cast(value)) // Records the values of a multi-parted counter called "name" immediately. // The UI will treat value1 and value2 as parts of a whole, displaying their // values as a stacked-bar chart. // - category and name strings must have application lifetime (statics or // literals). They may not include " chars. #define TRACE_COUNTER2(category, name, value1_name, value1_val, \ value2_name, value2_val) \ INTERNAL_TRACE_EVENT_ADD(TRACE_EVENT_PHASE_COUNTER, \ category, name, TRACE_EVENT_FLAG_NONE, \ value1_name, static_cast(value1_val), \ value2_name, static_cast(value2_val)) #define TRACE_COPY_COUNTER2(category, name, value1_name, value1_val, \ value2_name, value2_val) \ INTERNAL_TRACE_EVENT_ADD(TRACE_EVENT_PHASE_COUNTER, \ category, name, TRACE_EVENT_FLAG_COPY, \ value1_name, static_cast(value1_val), \ value2_name, static_cast(value2_val)) // Records the value of a counter called "name" immediately. Value // must be representable as a 32 bit integer. // - category and name strings must have application lifetime (statics or // literals). They may not include " chars. // - |id| is used to disambiguate counters with the same name. It must either // be a pointer or an integer value up to 64 bits. If it's a pointer, the bits // will be xored with a hash of the process ID so that the same pointer on // two different processes will not collide. #define TRACE_COUNTER_ID1(category, name, id, value) \ INTERNAL_TRACE_EVENT_ADD_WITH_ID(TRACE_EVENT_PHASE_COUNTER, \ category, name, id, TRACE_EVENT_FLAG_NONE, \ "value", static_cast(value)) #define TRACE_COPY_COUNTER_ID1(category, name, id, value) \ INTERNAL_TRACE_EVENT_ADD_WITH_ID(TRACE_EVENT_PHASE_COUNTER, \ category, name, id, TRACE_EVENT_FLAG_COPY, \ "value", static_cast(value)) // Records the values of a multi-parted counter called "name" immediately. // The UI will treat value1 and value2 as parts of a whole, displaying their // values as a stacked-bar chart. // - category and name strings must have application lifetime (statics or // literals). They may not include " chars. // - |id| is used to disambiguate counters with the same name. It must either // be a pointer or an integer value up to 64 bits. If it's a pointer, the bits // will be xored with a hash of the process ID so that the same pointer on // two different processes will not collide. #define TRACE_COUNTER_ID2(category, name, id, value1_name, value1_val, \ value2_name, value2_val) \ INTERNAL_TRACE_EVENT_ADD_WITH_ID(TRACE_EVENT_PHASE_COUNTER, \ category, name, id, TRACE_EVENT_FLAG_NONE, \ value1_name, static_cast(value1_val), \ value2_name, static_cast(value2_val)) #define TRACE_COPY_COUNTER_ID2(category, name, id, value1_name, value1_val, \ value2_name, value2_val) \ INTERNAL_TRACE_EVENT_ADD_WITH_ID(TRACE_EVENT_PHASE_COUNTER, \ category, name, id, TRACE_EVENT_FLAG_COPY, \ value1_name, static_cast(value1_val), \ value2_name, static_cast(value2_val)) // Records a single ASYNC_BEGIN event called "name" immediately, with 0, 1 or 2 // associated arguments. If the category is not enabled, then this // does nothing. // - category and name strings must have application lifetime (statics or // literals). They may not include " chars. // - |id| is used to match the ASYNC_BEGIN event with the ASYNC_END event. ASYNC // events are considered to match if their category, name and id values all // match. |id| must either be a pointer or an integer value up to 64 bits. If // it's a pointer, the bits will be xored with a hash of the process ID so // that the same pointer on two different processes will not collide. // // An asynchronous operation can consist of multiple phases. The first phase is // defined by the ASYNC_BEGIN calls. Additional phases can be defined using the // ASYNC_STEP_INTO or ASYNC_STEP_PAST macros. The ASYNC_STEP_INTO macro will // annotate the block following the call. The ASYNC_STEP_PAST macro will // annotate the block prior to the call. Note that any particular event must use // only STEP_INTO or STEP_PAST macros; they can not mix and match. When the // operation completes, call ASYNC_END. // // An ASYNC trace typically occurs on a single thread (if not, they will only be // drawn on the thread defined in the ASYNC_BEGIN event), but all events in that // operation must use the same |name| and |id|. Each step can have its own #define TRACE_EVENT_ASYNC_BEGIN0(category, name, id) \ INTERNAL_TRACE_EVENT_ADD_WITH_ID(TRACE_EVENT_PHASE_ASYNC_BEGIN, \ category, name, id, TRACE_EVENT_FLAG_NONE) #define TRACE_EVENT_ASYNC_BEGIN1(category, name, id, arg1_name, arg1_val) \ INTERNAL_TRACE_EVENT_ADD_WITH_ID(TRACE_EVENT_PHASE_ASYNC_BEGIN, \ category, name, id, TRACE_EVENT_FLAG_NONE, arg1_name, arg1_val) #define TRACE_EVENT_ASYNC_BEGIN2(category, name, id, arg1_name, arg1_val, \ arg2_name, arg2_val) \ INTERNAL_TRACE_EVENT_ADD_WITH_ID(TRACE_EVENT_PHASE_ASYNC_BEGIN, \ category, name, id, TRACE_EVENT_FLAG_NONE, \ arg1_name, arg1_val, arg2_name, arg2_val) #define TRACE_EVENT_COPY_ASYNC_BEGIN0(category, name, id) \ INTERNAL_TRACE_EVENT_ADD_WITH_ID(TRACE_EVENT_PHASE_ASYNC_BEGIN, \ category, name, id, TRACE_EVENT_FLAG_COPY) #define TRACE_EVENT_COPY_ASYNC_BEGIN1(category, name, id, arg1_name, arg1_val) \ INTERNAL_TRACE_EVENT_ADD_WITH_ID(TRACE_EVENT_PHASE_ASYNC_BEGIN, \ category, name, id, TRACE_EVENT_FLAG_COPY, \ arg1_name, arg1_val) #define TRACE_EVENT_COPY_ASYNC_BEGIN2(category, name, id, arg1_name, arg1_val, \ arg2_name, arg2_val) \ INTERNAL_TRACE_EVENT_ADD_WITH_ID(TRACE_EVENT_PHASE_ASYNC_BEGIN, \ category, name, id, TRACE_EVENT_FLAG_COPY, \ arg1_name, arg1_val, arg2_name, arg2_val) // Records a single ASYNC_STEP_INTO event for |step| immediately. If the // category is not enabled, then this does nothing. The |name| and |id| must // match the ASYNC_BEGIN event above. The |step| param identifies this step // within the async event. This should be called at the beginning of the next // phase of an asynchronous operation. The ASYNC_BEGIN event must not have any // ASYNC_STEP_PAST events. #define TRACE_EVENT_ASYNC_STEP_INTO0(category, name, id, step) \ INTERNAL_TRACE_EVENT_ADD_WITH_ID(TRACE_EVENT_PHASE_ASYNC_STEP_INTO, \ category, name, id, TRACE_EVENT_FLAG_NONE, "step", step) #define TRACE_EVENT_ASYNC_STEP_INTO1(category, name, id, step, \ arg1_name, arg1_val) \ INTERNAL_TRACE_EVENT_ADD_WITH_ID(TRACE_EVENT_PHASE_ASYNC_STEP_INTO, \ category, name, id, TRACE_EVENT_FLAG_NONE, "step", step, \ arg1_name, arg1_val) // Records a single ASYNC_STEP_PAST event for |step| immediately. If the // category is not enabled, then this does nothing. The |name| and |id| must // match the ASYNC_BEGIN event above. The |step| param identifies this step // within the async event. This should be called at the beginning of the next // phase of an asynchronous operation. The ASYNC_BEGIN event must not have any // ASYNC_STEP_INTO events. #define TRACE_EVENT_ASYNC_STEP_PAST0(category_group, name, id, step) \ INTERNAL_TRACE_EVENT_ADD_WITH_ID(TRACE_EVENT_PHASE_ASYNC_STEP_PAST, \ category_group, name, id, TRACE_EVENT_FLAG_NONE, "step", step) #define TRACE_EVENT_ASYNC_STEP_PAST1(category_group, name, id, step, arg1_name, arg1_val) \ INTERNAL_TRACE_EVENT_ADD_WITH_ID(TRACE_EVENT_PHASE_ASYNC_STEP_PAST, \ category_group, name, id, TRACE_EVENT_FLAG_NONE, "step", step, \ arg1_name, arg1_val) // Records a single ASYNC_END event for "name" immediately. If the category // is not enabled, then this does nothing. #define TRACE_EVENT_ASYNC_END0(category, name, id) \ INTERNAL_TRACE_EVENT_ADD_WITH_ID(TRACE_EVENT_PHASE_ASYNC_END, \ category, name, id, TRACE_EVENT_FLAG_NONE) #define TRACE_EVENT_ASYNC_END1(category, name, id, arg1_name, arg1_val) \ INTERNAL_TRACE_EVENT_ADD_WITH_ID(TRACE_EVENT_PHASE_ASYNC_END, \ category, name, id, TRACE_EVENT_FLAG_NONE, arg1_name, arg1_val) #define TRACE_EVENT_ASYNC_END2(category, name, id, arg1_name, arg1_val, \ arg2_name, arg2_val) \ INTERNAL_TRACE_EVENT_ADD_WITH_ID(TRACE_EVENT_PHASE_ASYNC_END, \ category, name, id, TRACE_EVENT_FLAG_NONE, \ arg1_name, arg1_val, arg2_name, arg2_val) #define TRACE_EVENT_COPY_ASYNC_END0(category, name, id) \ INTERNAL_TRACE_EVENT_ADD_WITH_ID(TRACE_EVENT_PHASE_ASYNC_END, \ category, name, id, TRACE_EVENT_FLAG_COPY) #define TRACE_EVENT_COPY_ASYNC_END1(category, name, id, arg1_name, arg1_val) \ INTERNAL_TRACE_EVENT_ADD_WITH_ID(TRACE_EVENT_PHASE_ASYNC_END, \ category, name, id, TRACE_EVENT_FLAG_COPY, \ arg1_name, arg1_val) #define TRACE_EVENT_COPY_ASYNC_END2(category, name, id, arg1_name, arg1_val, \ arg2_name, arg2_val) \ INTERNAL_TRACE_EVENT_ADD_WITH_ID(TRACE_EVENT_PHASE_ASYNC_END, \ category, name, id, TRACE_EVENT_FLAG_COPY, \ arg1_name, arg1_val, arg2_name, arg2_val) // Creates a scope of a sampling state with the given category and name (both must // be constant strings). These states are intended for a sampling profiler. // Implementation note: we store category and name together because we don't // want the inconsistency/expense of storing two pointers. // |thread_bucket| is [0..2] and is used to statically isolate samples in one // thread from others. // // { // The sampling state is set within this scope. // TRACE_EVENT_SAMPLING_STATE_SCOPE_FOR_BUCKET(0, "category", "name"); // ...; // } #define TRACE_EVENT_SCOPED_SAMPLING_STATE_FOR_BUCKET(bucket_number, category, name) \ TraceEvent::SamplingStateScope traceEventSamplingScope(category "\0" name); // Returns a current sampling state of the given bucket. // The format of the returned string is "category\0name". #define TRACE_EVENT_GET_SAMPLING_STATE_FOR_BUCKET(bucket_number) \ TraceEvent::SamplingStateScope::current() // Sets a current sampling state of the given bucket. // |category| and |name| have to be constant strings. #define TRACE_EVENT_SET_SAMPLING_STATE_FOR_BUCKET(bucket_number, category, name) \ TraceEvent::SamplingStateScope::set(category "\0" name) // Sets a current sampling state of the given bucket. // |categoryAndName| doesn't need to be a constant string. // The format of the string is "category\0name". #define TRACE_EVENT_SET_NONCONST_SAMPLING_STATE_FOR_BUCKET(bucket_number, categoryAndName) \ TraceEvent::SamplingStateScope::set(categoryAndName) // Syntactic sugars for the sampling tracing in the main thread. #define TRACE_EVENT_SCOPED_SAMPLING_STATE(category, name) \ TRACE_EVENT_SCOPED_SAMPLING_STATE_FOR_BUCKET(0, category, name) #define TRACE_EVENT_GET_SAMPLING_STATE() \ TRACE_EVENT_GET_SAMPLING_STATE_FOR_BUCKET(0) #define TRACE_EVENT_SET_SAMPLING_STATE(category, name) \ TRACE_EVENT_SET_SAMPLING_STATE_FOR_BUCKET(0, category, name) #define TRACE_EVENT_SET_NONCONST_SAMPLING_STATE(categoryAndName) \ TRACE_EVENT_SET_NONCONST_SAMPLING_STATE_FOR_BUCKET(0, categoryAndName) // Macros to track the life time and value of arbitrary client objects. // See also TraceTrackableObject. #define TRACE_EVENT_OBJECT_CREATED_WITH_ID(categoryGroup, name, id) \ INTERNAL_TRACE_EVENT_ADD_WITH_ID(TRACE_EVENT_PHASE_CREATE_OBJECT, \ categoryGroup, name, TRACE_ID_DONT_MANGLE(id), TRACE_EVENT_FLAG_NONE) #define TRACE_EVENT_OBJECT_DELETED_WITH_ID(categoryGroup, name, id) \ INTERNAL_TRACE_EVENT_ADD_WITH_ID(TRACE_EVENT_PHASE_DELETE_OBJECT, \ categoryGroup, name, TRACE_ID_DONT_MANGLE(id), TRACE_EVENT_FLAG_NONE) // Macro to efficiently determine if a given category group is enabled. #define TRACE_EVENT_CATEGORY_GROUP_ENABLED(categoryGroup, ret) \ do { \ INTERNAL_TRACE_EVENT_GET_CATEGORY_INFO(categoryGroup); \ if (*INTERNALTRACEEVENTUID(categoryGroupEnabled)) { \ *ret = true; \ } else { \ *ret = false; \ } \ } while (0) // This will mark the trace event as disabled by default. The user will need // to explicitly enable the event. #define TRACE_DISABLED_BY_DEFAULT(name) "disabled-by-default-" name //////////////////////////////////////////////////////////////////////////////// // Implementation specific tracing API definitions. // Get a pointer to the enabled state of the given trace category. Only // long-lived literal strings should be given as the category name. The returned // pointer can be held permanently in a local static for example. If the // unsigned char is non-zero, tracing is enabled. If tracing is enabled, // TRACE_EVENT_API_ADD_TRACE_EVENT can be called. It's OK if tracing is disabled // between the load of the tracing state and the call to // TRACE_EVENT_API_ADD_TRACE_EVENT, because this flag only provides an early out // for best performance when tracing is disabled. // const unsigned char* // TRACE_EVENT_API_GET_CATEGORY_ENABLED(const char* category_name) #define TRACE_EVENT_API_GET_CATEGORY_ENABLED \ WebCore::EventTracer::getTraceCategoryEnabledFlag // Add a trace event to the platform tracing system. // WebCore::TraceEvent::TraceEventHandle TRACE_EVENT_API_ADD_TRACE_EVENT( // char phase, // const unsigned char* category_enabled, // const char* name, // unsigned long long id, // int num_args, // const char** arg_names, // const unsigned char* arg_types, // const unsigned long long* arg_values, // unsigned char flags) #define TRACE_EVENT_API_ADD_TRACE_EVENT \ WebCore::EventTracer::addTraceEvent // Set the duration field of a COMPLETE trace event. // void TRACE_EVENT_API_UPDATE_TRACE_EVENT_DURATION( // WebCore::TraceEvent::TraceEventHandle handle) #define TRACE_EVENT_API_UPDATE_TRACE_EVENT_DURATION \ WebCore::EventTracer::updateTraceEventDuration //////////////////////////////////////////////////////////////////////////////// // Implementation detail: trace event macros create temporary variables // to keep instrumentation overhead low. These macros give each temporary // variable a unique name based on the line number to prevent name collissions. #define INTERNAL_TRACE_EVENT_UID3(a, b) \ trace_event_unique_##a##b #define INTERNAL_TRACE_EVENT_UID2(a, b) \ INTERNAL_TRACE_EVENT_UID3(a, b) #define INTERNALTRACEEVENTUID(name_prefix) \ INTERNAL_TRACE_EVENT_UID2(name_prefix, __LINE__) // Implementation detail: internal macro to create static category. // - WTF_ANNOTATE_BENIGN_RACE, see Thread Safety above. #define INTERNAL_TRACE_EVENT_GET_CATEGORY_INFO(category) \ static const unsigned char* INTERNALTRACEEVENTUID(categoryGroupEnabled) = 0; \ WTF_ANNOTATE_BENIGN_RACE(&INTERNALTRACEEVENTUID(categoryGroupEnabled), \ "trace_event category"); \ if (!INTERNALTRACEEVENTUID(categoryGroupEnabled)) { \ INTERNALTRACEEVENTUID(categoryGroupEnabled) = \ TRACE_EVENT_API_GET_CATEGORY_ENABLED(category); \ } // Implementation detail: internal macro to create static category and add // event if the category is enabled. #define INTERNAL_TRACE_EVENT_ADD(phase, category, name, flags, ...) \ do { \ INTERNAL_TRACE_EVENT_GET_CATEGORY_INFO(category); \ if (*INTERNALTRACEEVENTUID(categoryGroupEnabled)) { \ WebCore::TraceEvent::addTraceEvent( \ phase, INTERNALTRACEEVENTUID(categoryGroupEnabled), name, \ WebCore::TraceEvent::noEventId, flags, ##__VA_ARGS__); \ } \ } while (0) // Implementation detail: internal macro to create static category and add begin // event if the category is enabled. Also adds the end event when the scope // ends. #define INTERNAL_TRACE_EVENT_ADD_SCOPED(category, name, ...) \ INTERNAL_TRACE_EVENT_GET_CATEGORY_INFO(category); \ WebCore::TraceEvent::ScopedTracer INTERNALTRACEEVENTUID(scopedTracer); \ if (*INTERNALTRACEEVENTUID(categoryGroupEnabled)) { \ WebCore::TraceEvent::TraceEventHandle h = \ WebCore::TraceEvent::addTraceEvent( \ TRACE_EVENT_PHASE_COMPLETE, \ INTERNALTRACEEVENTUID(categoryGroupEnabled), \ name, WebCore::TraceEvent::noEventId, \ TRACE_EVENT_FLAG_NONE, ##__VA_ARGS__); \ INTERNALTRACEEVENTUID(scopedTracer).initialize( \ INTERNALTRACEEVENTUID(categoryGroupEnabled), name, h); \ } // Implementation detail: internal macro to create static category and add // event if the category is enabled. #define INTERNAL_TRACE_EVENT_ADD_WITH_ID(phase, category, name, id, flags, \ ...) \ do { \ INTERNAL_TRACE_EVENT_GET_CATEGORY_INFO(category); \ if (*INTERNALTRACEEVENTUID(categoryGroupEnabled)) { \ unsigned char traceEventFlags = flags | TRACE_EVENT_FLAG_HAS_ID; \ WebCore::TraceEvent::TraceID traceEventTraceID( \ id, &traceEventFlags); \ WebCore::TraceEvent::addTraceEvent( \ phase, INTERNALTRACEEVENTUID(categoryGroupEnabled), \ name, traceEventTraceID.data(), traceEventFlags, \ ##__VA_ARGS__); \ } \ } while (0) // Notes regarding the following definitions: // New values can be added and propagated to third party libraries, but existing // definitions must never be changed, because third party libraries may use old // definitions. // Phase indicates the nature of an event entry. E.g. part of a begin/end pair. #define TRACE_EVENT_PHASE_BEGIN ('B') #define TRACE_EVENT_PHASE_END ('E') #define TRACE_EVENT_PHASE_COMPLETE ('X') // FIXME: unify instant events handling between blink and platform. #define TRACE_EVENT_PHASE_INSTANT ('I') #define TRACE_EVENT_PHASE_INSTANT_WITH_SCOPE ('i') #define TRACE_EVENT_PHASE_ASYNC_BEGIN ('S') #define TRACE_EVENT_PHASE_ASYNC_STEP_INTO ('T') #define TRACE_EVENT_PHASE_ASYNC_STEP_PAST ('p') #define TRACE_EVENT_PHASE_ASYNC_END ('F') #define TRACE_EVENT_PHASE_METADATA ('M') #define TRACE_EVENT_PHASE_COUNTER ('C') #define TRACE_EVENT_PHASE_SAMPLE ('P') #define TRACE_EVENT_PHASE_CREATE_OBJECT ('N') #define TRACE_EVENT_PHASE_DELETE_OBJECT ('D') // Flags for changing the behavior of TRACE_EVENT_API_ADD_TRACE_EVENT. #define TRACE_EVENT_FLAG_NONE (static_cast(0)) #define TRACE_EVENT_FLAG_COPY (static_cast(1 << 0)) #define TRACE_EVENT_FLAG_HAS_ID (static_cast(1 << 1)) #define TRACE_EVENT_FLAG_MANGLE_ID (static_cast(1 << 2)) // Type values for identifying types in the TraceValue union. #define TRACE_VALUE_TYPE_BOOL (static_cast(1)) #define TRACE_VALUE_TYPE_UINT (static_cast(2)) #define TRACE_VALUE_TYPE_INT (static_cast(3)) #define TRACE_VALUE_TYPE_DOUBLE (static_cast(4)) #define TRACE_VALUE_TYPE_POINTER (static_cast(5)) #define TRACE_VALUE_TYPE_STRING (static_cast(6)) #define TRACE_VALUE_TYPE_COPY_STRING (static_cast(7)) namespace WebCore { namespace TraceEvent { // Specify these values when the corresponding argument of addTraceEvent is not // used. const int zeroNumArgs = 0; const unsigned long long noEventId = 0; // TraceID encapsulates an ID that can either be an integer or pointer. Pointers // are mangled with the Process ID so that they are unlikely to collide when the // same pointer is used on different processes. class TraceID { public: template class MangleBehavior { public: template explicit MangleBehavior(T id) : m_data(reinterpret_cast(id)) { } unsigned long long data() const { return m_data; } private: unsigned long long m_data; }; typedef MangleBehavior DontMangle; typedef MangleBehavior ForceMangle; TraceID(const void* id, unsigned char* flags) : m_data(static_cast(reinterpret_cast(id))) { *flags |= TRACE_EVENT_FLAG_MANGLE_ID; } TraceID(ForceMangle id, unsigned char* flags) : m_data(id.data()) { *flags |= TRACE_EVENT_FLAG_MANGLE_ID; } TraceID(DontMangle id, unsigned char*) : m_data(id.data()) { } TraceID(unsigned long long id, unsigned char*) : m_data(id) { } TraceID(unsigned long id, unsigned char*) : m_data(id) { } TraceID(unsigned id, unsigned char*) : m_data(id) { } TraceID(unsigned short id, unsigned char*) : m_data(id) { } TraceID(unsigned char id, unsigned char*) : m_data(id) { } TraceID(long long id, unsigned char*) : m_data(static_cast(id)) { } TraceID(long id, unsigned char*) : m_data(static_cast(id)) { } TraceID(int id, unsigned char*) : m_data(static_cast(id)) { } TraceID(short id, unsigned char*) : m_data(static_cast(id)) { } TraceID(signed char id, unsigned char*) : m_data(static_cast(id)) { } unsigned long long data() const { return m_data; } private: unsigned long long m_data; }; // Simple union to store various types as unsigned long long. union TraceValueUnion { bool m_bool; unsigned long long m_uint; long long m_int; double m_double; const void* m_pointer; const char* m_string; }; // Simple container for const char* that should be copied instead of retained. class TraceStringWithCopy { public: explicit TraceStringWithCopy(const char* str) : m_str(str) { } operator const char* () const { return m_str; } private: const char* m_str; }; // Define setTraceValue for each allowed type. It stores the type and // value in the return arguments. This allows this API to avoid declaring any // structures so that it is portable to third_party libraries. #define INTERNAL_DECLARE_SET_TRACE_VALUE(actual_type, \ union_member, \ value_type_id) \ static inline void setTraceValue(actual_type arg, \ unsigned char* type, \ unsigned long long* value) { \ TraceValueUnion typeValue; \ typeValue.union_member = arg; \ *type = value_type_id; \ *value = typeValue.m_uint; \ } // Simpler form for int types that can be safely casted. #define INTERNAL_DECLARE_SET_TRACE_VALUE_INT(actual_type, \ value_type_id) \ static inline void setTraceValue(actual_type arg, \ unsigned char* type, \ unsigned long long* value) { \ *type = value_type_id; \ *value = static_cast(arg); \ } INTERNAL_DECLARE_SET_TRACE_VALUE_INT(unsigned long long, TRACE_VALUE_TYPE_UINT) INTERNAL_DECLARE_SET_TRACE_VALUE_INT(unsigned int, TRACE_VALUE_TYPE_UINT) INTERNAL_DECLARE_SET_TRACE_VALUE_INT(unsigned short, TRACE_VALUE_TYPE_UINT) INTERNAL_DECLARE_SET_TRACE_VALUE_INT(unsigned char, TRACE_VALUE_TYPE_UINT) INTERNAL_DECLARE_SET_TRACE_VALUE_INT(long long, TRACE_VALUE_TYPE_INT) INTERNAL_DECLARE_SET_TRACE_VALUE_INT(int, TRACE_VALUE_TYPE_INT) INTERNAL_DECLARE_SET_TRACE_VALUE_INT(short, TRACE_VALUE_TYPE_INT) INTERNAL_DECLARE_SET_TRACE_VALUE_INT(signed char, TRACE_VALUE_TYPE_INT) INTERNAL_DECLARE_SET_TRACE_VALUE(bool, m_bool, TRACE_VALUE_TYPE_BOOL) INTERNAL_DECLARE_SET_TRACE_VALUE(double, m_double, TRACE_VALUE_TYPE_DOUBLE) INTERNAL_DECLARE_SET_TRACE_VALUE(const void*, m_pointer, TRACE_VALUE_TYPE_POINTER) INTERNAL_DECLARE_SET_TRACE_VALUE(const char*, m_string, TRACE_VALUE_TYPE_STRING) INTERNAL_DECLARE_SET_TRACE_VALUE(const TraceStringWithCopy&, m_string, TRACE_VALUE_TYPE_COPY_STRING) #undef INTERNAL_DECLARE_SET_TRACE_VALUE #undef INTERNAL_DECLARE_SET_TRACE_VALUE_INT // WTF::String version of setTraceValue so that trace arguments can be strings. static inline void setTraceValue(const WTF::CString& arg, unsigned char* type, unsigned long long* value) { TraceValueUnion typeValue; typeValue.m_string = arg.data(); *type = TRACE_VALUE_TYPE_COPY_STRING; *value = typeValue.m_uint; } // These addTraceEvent template functions are defined here instead of in the // macro, because the arg values could be temporary string objects. In order to // store pointers to the internal c_str and pass through to the tracing API, the // arg values must live throughout these procedures. static inline TraceEventHandle addTraceEvent( char phase, const unsigned char* categoryEnabled, const char* name, unsigned long long id, unsigned char flags) { return TRACE_EVENT_API_ADD_TRACE_EVENT( phase, categoryEnabled, name, id, zeroNumArgs, 0, 0, 0, flags); } template static inline TraceEventHandle addTraceEvent( char phase, const unsigned char* categoryEnabled, const char* name, unsigned long long id, unsigned char flags, const char* arg1Name, const ARG1_TYPE& arg1Val) { const int numArgs = 1; unsigned char argTypes[1]; unsigned long long argValues[1]; setTraceValue(arg1Val, &argTypes[0], &argValues[0]); return TRACE_EVENT_API_ADD_TRACE_EVENT( phase, categoryEnabled, name, id, numArgs, &arg1Name, argTypes, argValues, flags); } template static inline TraceEventHandle addTraceEvent( char phase, const unsigned char* categoryEnabled, const char* name, unsigned long long id, unsigned char flags, const char* arg1Name, const ARG1_TYPE& arg1Val, const char* arg2Name, const ARG2_TYPE& arg2Val) { const int numArgs = 2; const char* argNames[2] = { arg1Name, arg2Name }; unsigned char argTypes[2]; unsigned long long argValues[2]; setTraceValue(arg1Val, &argTypes[0], &argValues[0]); setTraceValue(arg2Val, &argTypes[1], &argValues[1]); return TRACE_EVENT_API_ADD_TRACE_EVENT( phase, categoryEnabled, name, id, numArgs, argNames, argTypes, argValues, flags); } // Used by TRACE_EVENTx macro. Do not use directly. class ScopedTracer { public: // Note: members of m_data intentionally left uninitialized. See initialize. ScopedTracer() : m_pdata(0) { } ~ScopedTracer() { if (m_pdata && *m_pdata->categoryGroupEnabled) TRACE_EVENT_API_UPDATE_TRACE_EVENT_DURATION(m_data.categoryGroupEnabled, m_data.name, m_data.eventHandle); } void initialize(const unsigned char* categoryGroupEnabled, const char* name, TraceEventHandle eventHandle) { m_data.categoryGroupEnabled = categoryGroupEnabled; m_data.name = name; m_data.eventHandle = eventHandle; m_pdata = &m_data; } private: // This Data struct workaround is to avoid initializing all the members // in Data during construction of this object, since this object is always // constructed, even when tracing is disabled. If the members of Data were // members of this class instead, compiler warnings occur about potential // uninitialized accesses. struct Data { const unsigned char* categoryGroupEnabled; const char* name; TraceEventHandle eventHandle; }; Data* m_pdata; Data m_data; }; // TraceEventSamplingStateScope records the current sampling state // and sets a new sampling state. When the scope exists, it restores // the sampling state having recorded. template class SamplingStateScope { WTF_MAKE_FAST_ALLOCATED; public: SamplingStateScope(const char* categoryAndName) { m_previousState = SamplingStateScope::current(); SamplingStateScope::set(categoryAndName); } ~SamplingStateScope() { SamplingStateScope::set(m_previousState); } // FIXME: Make load/store to traceSamplingState[] thread-safe and atomic. static inline const char* current() { return reinterpret_cast(*WebCore::traceSamplingState[BucketNumber]); } static inline void set(const char* categoryAndName) { *WebCore::traceSamplingState[BucketNumber] = reinterpret_cast(const_cast(categoryAndName)); } private: const char* m_previousState; }; template class TraceScopedTrackableObject { WTF_MAKE_NONCOPYABLE(TraceScopedTrackableObject); public: TraceScopedTrackableObject(const char* categoryGroup, const char* name, IDType id) : m_categoryGroup(categoryGroup), m_name(name), m_id(id) { TRACE_EVENT_OBJECT_CREATED_WITH_ID(m_categoryGroup, m_name, m_id); } ~TraceScopedTrackableObject() { TRACE_EVENT_OBJECT_DELETED_WITH_ID(m_categoryGroup, m_name, m_id); } private: const char* m_categoryGroup; const char* m_name; IDType m_id; }; } // namespace TraceEvent } // namespace WebCore #endif