The Tor Browser: gfx/skia/trunk/src/core/SkTraceEvent.h@129ffea94266 (annotated)

gfx/skia/trunk/src/core/SkTraceEvent.h@129ffea94266 (annotated)

gfx/skia/trunk/src/core/SkTraceEvent.h

Sat, 03 Jan 2015 20:18:00 +0100

author: Michael Schloh von Bennewitz <michael@schloh.com>
date: Sat, 03 Jan 2015 20:18:00 +0100
branch: TOR_BUG_3246
changeset 7: 129ffea94266
permissions: -rw-r--r--

Conditionally enable double key logic according to:
private browsing mode or privacy.thirdparty.isolate preference and
implement in GetCookieStringCommon and FindCookie where it counts...
With some reservations of how to convince FindCookie users to test
condition and pass a nullptr when disabling double key logic.

 // Copyright (c) 2014 Google Inc.
 //
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 // This header file defines the set of trace_event macros without specifying
 // how the events actually get collected and stored. If you need to expose trace
 // events to some other universe, you can copy-and-paste this file as well as
 // trace_event.h, modifying the macros contained there as necessary for the
 // target platform. The end result is that multiple libraries can funnel events
 // through to a shared trace event collector.
 // 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",
 //                        TRACE_EVENT_SCOPE_THREAD)
 //
 // It is often the case that one trace may belong in multiple categories at the
 // same time. The first argument to the trace can be a comma-separated list of
 // categories, forming a category group, like:
 //
 // TRACE_EVENT_INSTANT0("input,views", "OnMouseOver", TRACE_EVENT_SCOPE_THREAD)
 //
 // We can enable/disable tracing of OnMouseOver by enabling/disabling either
 // category.
 //
 // 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 disambiguate 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_group, name, and arg_names.  Thus, the following code will
 // cause problems:
 //     char* str = strdup("importantName");
 //     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_group_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 acquiring a lock
 // and resolving the category.
 #ifndef SkTraceEvent_DEFINED
 #define SkTraceEvent_DEFINED
 #include "SkEventTracer.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) \
     skia::tracing_internals::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) \
     skia::tracing_internals::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) \
     skia::tracing_internals::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_group, name) \
     INTERNAL_TRACE_EVENT_ADD_SCOPED(category_group, name)
 #define TRACE_EVENT1(category_group, name, arg1_name, arg1_val) \
     INTERNAL_TRACE_EVENT_ADD_SCOPED(category_group, name, arg1_name, arg1_val)
 #define TRACE_EVENT2( \
     category_group, name, arg1_name, arg1_val, arg2_name, arg2_val) \
   INTERNAL_TRACE_EVENT_ADD_SCOPED( \
       category_group, name, arg1_name, arg1_val, arg2_name, arg2_val)
 // Records events like TRACE_EVENT2 but uses |memory_tag| for memory tracing.
 // Use this where |name| is too generic to accurately aggregate allocations.
 #define TRACE_EVENT_WITH_MEMORY_TAG2( \
     category, name, memory_tag, arg1_name, arg1_val, arg2_name, arg2_val) \
   INTERNAL_TRACE_EVENT_ADD_SCOPED( \
       category, name, arg1_name, arg1_val, arg2_name, arg2_val)
 // UNSHIPPED_TRACE_EVENT* are like TRACE_EVENT* except that they are not
 // included in official builds.
 #if OFFICIAL_BUILD
 #undef TRACING_IS_OFFICIAL_BUILD
 #define TRACING_IS_OFFICIAL_BUILD 1
 #elif !defined(TRACING_IS_OFFICIAL_BUILD)
 #define TRACING_IS_OFFICIAL_BUILD 0
 #endif
 #if TRACING_IS_OFFICIAL_BUILD
 #define UNSHIPPED_TRACE_EVENT0(category_group, name) (void)0
 #define UNSHIPPED_TRACE_EVENT1(category_group, name, arg1_name, arg1_val) \
     (void)0
 #define UNSHIPPED_TRACE_EVENT2(category_group, name, arg1_name, arg1_val, \
                                arg2_name, arg2_val) (void)0
 #define UNSHIPPED_TRACE_EVENT_INSTANT0(category_group, name, scope) (void)0
 #define UNSHIPPED_TRACE_EVENT_INSTANT1(category_group, name, scope, \
                                        arg1_name, arg1_val) (void)0
 #define UNSHIPPED_TRACE_EVENT_INSTANT2(category_group, name, scope, \
                                        arg1_name, arg1_val, \
                                        arg2_name, arg2_val) (void)0
 #else
 #define UNSHIPPED_TRACE_EVENT0(category_group, name) \
     TRACE_EVENT0(category_group, name)
 #define UNSHIPPED_TRACE_EVENT1(category_group, name, arg1_name, arg1_val) \
     TRACE_EVENT1(category_group, name, arg1_name, arg1_val)
 #define UNSHIPPED_TRACE_EVENT2(category_group, name, arg1_name, arg1_val, \
                                arg2_name, arg2_val) \
     TRACE_EVENT2(category_group, name, arg1_name, arg1_val, arg2_name, arg2_val)
 #define UNSHIPPED_TRACE_EVENT_INSTANT0(category_group, name, scope) \
     TRACE_EVENT_INSTANT0(category_group, name, scope)
 #define UNSHIPPED_TRACE_EVENT_INSTANT1(category_group, name, scope, \
                                        arg1_name, arg1_val) \
     TRACE_EVENT_INSTANT1(category_group, name, scope, arg1_name, arg1_val)
 #define UNSHIPPED_TRACE_EVENT_INSTANT2(category_group, name, scope, \
                                        arg1_name, arg1_val, \
                                        arg2_name, arg2_val) \
     TRACE_EVENT_INSTANT2(category_group, name, scope, arg1_name, arg1_val, \
                          arg2_name, arg2_val)
 #endif
 // 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_group, name, scope) \
     INTERNAL_TRACE_EVENT_ADD(TRACE_EVENT_PHASE_INSTANT, \
         category_group, name, TRACE_EVENT_FLAG_NONE | scope)
 #define TRACE_EVENT_INSTANT1(category_group, name, scope, arg1_name, arg1_val) \
     INTERNAL_TRACE_EVENT_ADD(TRACE_EVENT_PHASE_INSTANT, \
         category_group, name, TRACE_EVENT_FLAG_NONE | scope, \
         arg1_name, arg1_val)
 #define TRACE_EVENT_INSTANT2(category_group, name, scope, arg1_name, arg1_val, \
                              arg2_name, arg2_val) \
     INTERNAL_TRACE_EVENT_ADD(TRACE_EVENT_PHASE_INSTANT, \
         category_group, name, TRACE_EVENT_FLAG_NONE | scope, \
         arg1_name, arg1_val, arg2_name, arg2_val)
 #define TRACE_EVENT_COPY_INSTANT0(category_group, name, scope) \
     INTERNAL_TRACE_EVENT_ADD(TRACE_EVENT_PHASE_INSTANT, \
         category_group, name, TRACE_EVENT_FLAG_COPY | scope)
 #define TRACE_EVENT_COPY_INSTANT1(category_group, name, scope, \
                                   arg1_name, arg1_val) \
     INTERNAL_TRACE_EVENT_ADD(TRACE_EVENT_PHASE_INSTANT, \
         category_group, name, TRACE_EVENT_FLAG_COPY | scope, arg1_name, \
         arg1_val)
 #define TRACE_EVENT_COPY_INSTANT2(category_group, name, scope, \
                                   arg1_name, arg1_val, \
                                   arg2_name, arg2_val) \
     INTERNAL_TRACE_EVENT_ADD(TRACE_EVENT_PHASE_INSTANT, \
         category_group, name, TRACE_EVENT_FLAG_COPY | scope, \
         arg1_name, arg1_val, arg2_name, arg2_val)
 // Sets the current sample state to 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.
 #define TRACE_EVENT_SET_SAMPLING_STATE_FOR_BUCKET( \
     bucket_number, category, name)                 \
         skia::tracing_internals::                     \
         TraceEventSamplingStateScope<bucket_number>::Set(category "\0" name)
 // Returns a current sampling state of the given bucket.
 #define TRACE_EVENT_GET_SAMPLING_STATE_FOR_BUCKET(bucket_number) \
     skia::tracing_internals::TraceEventSamplingStateScope<bucket_number>::Current()
 // Creates a scope of a sampling state of the given bucket.
 //
 // {  // 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)                                      \
     skia::tracing_internals::TraceEventSamplingStateScope<bucket_number>   \
         traceEventSamplingScope(category "\0" name);
 // 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)
 // 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_group, name) \
     INTERNAL_TRACE_EVENT_ADD(TRACE_EVENT_PHASE_BEGIN, \
         category_group, name, TRACE_EVENT_FLAG_NONE)
 #define TRACE_EVENT_BEGIN1(category_group, name, arg1_name, arg1_val) \
     INTERNAL_TRACE_EVENT_ADD(TRACE_EVENT_PHASE_BEGIN, \
         category_group, name, TRACE_EVENT_FLAG_NONE, arg1_name, arg1_val)
 #define TRACE_EVENT_BEGIN2(category_group, name, arg1_name, arg1_val, \
         arg2_name, arg2_val) \
     INTERNAL_TRACE_EVENT_ADD(TRACE_EVENT_PHASE_BEGIN, \
         category_group, name, TRACE_EVENT_FLAG_NONE, arg1_name, arg1_val, \
         arg2_name, arg2_val)
 #define TRACE_EVENT_COPY_BEGIN0(category_group, name) \
     INTERNAL_TRACE_EVENT_ADD(TRACE_EVENT_PHASE_BEGIN, \
         category_group, name, TRACE_EVENT_FLAG_COPY)
 #define TRACE_EVENT_COPY_BEGIN1(category_group, name, arg1_name, arg1_val) \
     INTERNAL_TRACE_EVENT_ADD(TRACE_EVENT_PHASE_BEGIN, \
         category_group, name, TRACE_EVENT_FLAG_COPY, arg1_name, arg1_val)
 #define TRACE_EVENT_COPY_BEGIN2(category_group, name, arg1_name, arg1_val, \
         arg2_name, arg2_val) \
     INTERNAL_TRACE_EVENT_ADD(TRACE_EVENT_PHASE_BEGIN, \
         category_group, name, TRACE_EVENT_FLAG_COPY, arg1_name, arg1_val, \
         arg2_name, arg2_val)
 // Similar to TRACE_EVENT_BEGINx but with a custom |at| timestamp provided.
 // - |id| is used to match the _BEGIN event with the _END event.
 //   Events are considered to match if their category_group, 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.
 #define TRACE_EVENT_BEGIN_WITH_ID_TID_AND_TIMESTAMP0(category_group, \
         name, id, thread_id) \
     INTERNAL_TRACE_EVENT_ADD_WITH_ID_TID_AND_TIMESTAMP( \
         TRACE_EVENT_PHASE_ASYNC_BEGIN, category_group, name, id, thread_id, \
         timestamp, TRACE_EVENT_FLAG_NONE)
 #define TRACE_EVENT_COPY_BEGIN_WITH_ID_TID_AND_TIMESTAMP0( \
         category_group, name, id, thread_id) \
     INTERNAL_TRACE_EVENT_ADD_WITH_ID_TID_AND_TIMESTAMP( \
         TRACE_EVENT_PHASE_ASYNC_BEGIN, category_group, name, id, thread_id, \
         timestamp, TRACE_EVENT_FLAG_COPY)
 // 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_group, name) \
     INTERNAL_TRACE_EVENT_ADD(TRACE_EVENT_PHASE_END, \
         category_group, name, TRACE_EVENT_FLAG_NONE)
 #define TRACE_EVENT_END1(category_group, name, arg1_name, arg1_val) \
     INTERNAL_TRACE_EVENT_ADD(TRACE_EVENT_PHASE_END, \
         category_group, name, TRACE_EVENT_FLAG_NONE, arg1_name, arg1_val)
 #define TRACE_EVENT_END2(category_group, name, arg1_name, arg1_val, \
         arg2_name, arg2_val) \
     INTERNAL_TRACE_EVENT_ADD(TRACE_EVENT_PHASE_END, \
         category_group, name, TRACE_EVENT_FLAG_NONE, arg1_name, arg1_val, \
         arg2_name, arg2_val)
 #define TRACE_EVENT_COPY_END0(category_group, name) \
     INTERNAL_TRACE_EVENT_ADD(TRACE_EVENT_PHASE_END, \
         category_group, name, TRACE_EVENT_FLAG_COPY)
 #define TRACE_EVENT_COPY_END1(category_group, name, arg1_name, arg1_val) \
     INTERNAL_TRACE_EVENT_ADD(TRACE_EVENT_PHASE_END, \
         category_group, name, TRACE_EVENT_FLAG_COPY, arg1_name, arg1_val)
 #define TRACE_EVENT_COPY_END2(category_group, name, arg1_name, arg1_val, \
         arg2_name, arg2_val) \
     INTERNAL_TRACE_EVENT_ADD(TRACE_EVENT_PHASE_END, \
         category_group, name, TRACE_EVENT_FLAG_COPY, arg1_name, arg1_val, \
         arg2_name, arg2_val)
 // Similar to TRACE_EVENT_ENDx but with a custom |at| timestamp provided.
 // - |id| is used to match the _BEGIN event with the _END event.
 //   Events are considered to match if their category_group, 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.
 #define TRACE_EVENT_END_WITH_ID_TID_AND_TIMESTAMP0(category_group, \
         name, id, thread_id) \
     INTERNAL_TRACE_EVENT_ADD_WITH_ID_TID_AND_TIMESTAMP( \
         TRACE_EVENT_PHASE_ASYNC_END, category_group, name, id, thread_id, \
         timestamp, TRACE_EVENT_FLAG_NONE)
 #define TRACE_EVENT_COPY_END_WITH_ID_TID_AND_TIMESTAMP0( \
         category_group, name, id, thread_id) \
     INTERNAL_TRACE_EVENT_ADD_WITH_ID_TID_AND_TIMESTAMP( \
         TRACE_EVENT_PHASE_ASYNC_END, category_group, name, id, thread_id, \
         timestamp, TRACE_EVENT_FLAG_COPY)
 // 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_group, name, value) \
     INTERNAL_TRACE_EVENT_ADD(TRACE_EVENT_PHASE_COUNTER, \
         category_group, name, TRACE_EVENT_FLAG_NONE, \
         "value", static_cast<int>(value))
 #define TRACE_COPY_COUNTER1(category_group, name, value) \
     INTERNAL_TRACE_EVENT_ADD(TRACE_EVENT_PHASE_COUNTER, \
         category_group, name, TRACE_EVENT_FLAG_COPY, \
         "value", static_cast<int>(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_group, name, value1_name, value1_val, \
         value2_name, value2_val) \
     INTERNAL_TRACE_EVENT_ADD(TRACE_EVENT_PHASE_COUNTER, \
         category_group, name, TRACE_EVENT_FLAG_NONE, \
         value1_name, static_cast<int>(value1_val), \
         value2_name, static_cast<int>(value2_val))
 #define TRACE_COPY_COUNTER2(category_group, name, value1_name, value1_val, \
         value2_name, value2_val) \
     INTERNAL_TRACE_EVENT_ADD(TRACE_EVENT_PHASE_COUNTER, \
         category_group, name, TRACE_EVENT_FLAG_COPY, \
         value1_name, static_cast<int>(value1_val), \
         value2_name, static_cast<int>(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_group, name, id, value) \
     INTERNAL_TRACE_EVENT_ADD_WITH_ID(TRACE_EVENT_PHASE_COUNTER, \
         category_group, name, id, TRACE_EVENT_FLAG_NONE, \
         "value", static_cast<int>(value))
 #define TRACE_COPY_COUNTER_ID1(category_group, name, id, value) \
     INTERNAL_TRACE_EVENT_ADD_WITH_ID(TRACE_EVENT_PHASE_COUNTER, \
         category_group, name, id, TRACE_EVENT_FLAG_COPY, \
         "value", static_cast<int>(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_group, name, id, value1_name, value1_val, \
         value2_name, value2_val) \
     INTERNAL_TRACE_EVENT_ADD_WITH_ID(TRACE_EVENT_PHASE_COUNTER, \
         category_group, name, id, TRACE_EVENT_FLAG_NONE, \
         value1_name, static_cast<int>(value1_val), \
         value2_name, static_cast<int>(value2_val))
 #define TRACE_COPY_COUNTER_ID2(category_group, name, id, value1_name, \
         value1_val, value2_name, value2_val) \
     INTERNAL_TRACE_EVENT_ADD_WITH_ID(TRACE_EVENT_PHASE_COUNTER, \
         category_group, name, id, TRACE_EVENT_FLAG_COPY, \
         value1_name, static_cast<int>(value1_val), \
         value2_name, static_cast<int>(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_group, 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
 // args.
 #define TRACE_EVENT_ASYNC_BEGIN0(category_group, name, id) \
     INTERNAL_TRACE_EVENT_ADD_WITH_ID(TRACE_EVENT_PHASE_ASYNC_BEGIN, \
         category_group, name, id, TRACE_EVENT_FLAG_NONE)
 #define TRACE_EVENT_ASYNC_BEGIN1(category_group, name, id, arg1_name, \
         arg1_val) \
     INTERNAL_TRACE_EVENT_ADD_WITH_ID(TRACE_EVENT_PHASE_ASYNC_BEGIN, \
         category_group, name, id, TRACE_EVENT_FLAG_NONE, arg1_name, arg1_val)
 #define TRACE_EVENT_ASYNC_BEGIN2(category_group, name, id, arg1_name, \
         arg1_val, arg2_name, arg2_val) \
     INTERNAL_TRACE_EVENT_ADD_WITH_ID(TRACE_EVENT_PHASE_ASYNC_BEGIN, \
         category_group, name, id, TRACE_EVENT_FLAG_NONE, \
         arg1_name, arg1_val, arg2_name, arg2_val)
 #define TRACE_EVENT_COPY_ASYNC_BEGIN0(category_group, name, id) \
     INTERNAL_TRACE_EVENT_ADD_WITH_ID(TRACE_EVENT_PHASE_ASYNC_BEGIN, \
         category_group, name, id, TRACE_EVENT_FLAG_COPY)
 #define TRACE_EVENT_COPY_ASYNC_BEGIN1(category_group, name, id, arg1_name, \
         arg1_val) \
     INTERNAL_TRACE_EVENT_ADD_WITH_ID(TRACE_EVENT_PHASE_ASYNC_BEGIN, \
         category_group, name, id, TRACE_EVENT_FLAG_COPY, \
         arg1_name, arg1_val)
 #define TRACE_EVENT_COPY_ASYNC_BEGIN2(category_group, name, id, arg1_name, \
         arg1_val, arg2_name, arg2_val) \
     INTERNAL_TRACE_EVENT_ADD_WITH_ID(TRACE_EVENT_PHASE_ASYNC_BEGIN, \
         category_group, 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_group, name, id, step) \
     INTERNAL_TRACE_EVENT_ADD_WITH_ID(TRACE_EVENT_PHASE_ASYNC_STEP_INTO, \
         category_group, name, id, TRACE_EVENT_FLAG_NONE, "step", step)
 #define TRACE_EVENT_ASYNC_STEP_INTO1(category_group, name, id, step, \
                                      arg1_name, arg1_val) \
     INTERNAL_TRACE_EVENT_ADD_WITH_ID(TRACE_EVENT_PHASE_ASYNC_STEP_INTO, \
         category_group, 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_group, name, id) \
     INTERNAL_TRACE_EVENT_ADD_WITH_ID(TRACE_EVENT_PHASE_ASYNC_END, \
         category_group, name, id, TRACE_EVENT_FLAG_NONE)
 #define TRACE_EVENT_ASYNC_END1(category_group, name, id, arg1_name, arg1_val) \
     INTERNAL_TRACE_EVENT_ADD_WITH_ID(TRACE_EVENT_PHASE_ASYNC_END, \
         category_group, name, id, TRACE_EVENT_FLAG_NONE, arg1_name, arg1_val)
 #define TRACE_EVENT_ASYNC_END2(category_group, name, id, arg1_name, arg1_val, \
         arg2_name, arg2_val) \
     INTERNAL_TRACE_EVENT_ADD_WITH_ID(TRACE_EVENT_PHASE_ASYNC_END, \
         category_group, name, id, TRACE_EVENT_FLAG_NONE, \
         arg1_name, arg1_val, arg2_name, arg2_val)
 #define TRACE_EVENT_COPY_ASYNC_END0(category_group, name, id) \
     INTERNAL_TRACE_EVENT_ADD_WITH_ID(TRACE_EVENT_PHASE_ASYNC_END, \
         category_group, name, id, TRACE_EVENT_FLAG_COPY)
 #define TRACE_EVENT_COPY_ASYNC_END1(category_group, name, id, arg1_name, \
         arg1_val) \
     INTERNAL_TRACE_EVENT_ADD_WITH_ID(TRACE_EVENT_PHASE_ASYNC_END, \
         category_group, name, id, TRACE_EVENT_FLAG_COPY, \
         arg1_name, arg1_val)
 #define TRACE_EVENT_COPY_ASYNC_END2(category_group, name, id, arg1_name, \
         arg1_val, arg2_name, arg2_val) \
     INTERNAL_TRACE_EVENT_ADD_WITH_ID(TRACE_EVENT_PHASE_ASYNC_END, \
         category_group, name, id, TRACE_EVENT_FLAG_COPY, \
         arg1_name, arg1_val, arg2_name, arg2_val)
 // Records a single FLOW_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 FLOW_BEGIN event with the FLOW_END event. FLOW
 //   events are considered to match if their category_group, 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.
 // FLOW events are different from ASYNC events in how they are drawn by the
 // tracing UI. A FLOW defines asynchronous data flow, such as posting a task
 // (FLOW_BEGIN) and later executing that task (FLOW_END). Expect FLOWs to be
 // drawn as lines or arrows from FLOW_BEGIN scopes to FLOW_END scopes. Similar
 // to ASYNC, a FLOW can consist of multiple phases. The first phase is defined
 // by the FLOW_BEGIN calls. Additional phases can be defined using the FLOW_STEP
 // macros. When the operation completes, call FLOW_END. An async operation can
 // span threads and processes, but all events in that operation must use the
 // same |name| and |id|. Each event can have its own args.
 #define TRACE_EVENT_FLOW_BEGIN0(category_group, name, id) \
     INTERNAL_TRACE_EVENT_ADD_WITH_ID(TRACE_EVENT_PHASE_FLOW_BEGIN, \
         category_group, name, id, TRACE_EVENT_FLAG_NONE)
 #define TRACE_EVENT_FLOW_BEGIN1(category_group, name, id, arg1_name, arg1_val) \
     INTERNAL_TRACE_EVENT_ADD_WITH_ID(TRACE_EVENT_PHASE_FLOW_BEGIN, \
         category_group, name, id, TRACE_EVENT_FLAG_NONE, arg1_name, arg1_val)
 #define TRACE_EVENT_FLOW_BEGIN2(category_group, name, id, arg1_name, arg1_val, \
         arg2_name, arg2_val) \
     INTERNAL_TRACE_EVENT_ADD_WITH_ID(TRACE_EVENT_PHASE_FLOW_BEGIN, \
         category_group, name, id, TRACE_EVENT_FLAG_NONE, \
         arg1_name, arg1_val, arg2_name, arg2_val)
 #define TRACE_EVENT_COPY_FLOW_BEGIN0(category_group, name, id) \
     INTERNAL_TRACE_EVENT_ADD_WITH_ID(TRACE_EVENT_PHASE_FLOW_BEGIN, \
         category_group, name, id, TRACE_EVENT_FLAG_COPY)
 #define TRACE_EVENT_COPY_FLOW_BEGIN1(category_group, name, id, arg1_name, \
         arg1_val) \
     INTERNAL_TRACE_EVENT_ADD_WITH_ID(TRACE_EVENT_PHASE_FLOW_BEGIN, \
         category_group, name, id, TRACE_EVENT_FLAG_COPY, \
         arg1_name, arg1_val)
 #define TRACE_EVENT_COPY_FLOW_BEGIN2(category_group, name, id, arg1_name, \
         arg1_val, arg2_name, arg2_val) \
     INTERNAL_TRACE_EVENT_ADD_WITH_ID(TRACE_EVENT_PHASE_FLOW_BEGIN, \
         category_group, name, id, TRACE_EVENT_FLAG_COPY, \
         arg1_name, arg1_val, arg2_name, arg2_val)
 // Records a single FLOW_STEP event for |step| immediately. If the category
 // is not enabled, then this does nothing. The |name| and |id| must match the
 // FLOW_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.
 #define TRACE_EVENT_FLOW_STEP0(category_group, name, id, step) \
     INTERNAL_TRACE_EVENT_ADD_WITH_ID(TRACE_EVENT_PHASE_FLOW_STEP, \
         category_group, name, id, TRACE_EVENT_FLAG_NONE, "step", step)
 #define TRACE_EVENT_FLOW_STEP1(category_group, name, id, step, \
         arg1_name, arg1_val) \
     INTERNAL_TRACE_EVENT_ADD_WITH_ID(TRACE_EVENT_PHASE_FLOW_STEP, \
         category_group, name, id, TRACE_EVENT_FLAG_NONE, "step", step, \
         arg1_name, arg1_val)
 #define TRACE_EVENT_COPY_FLOW_STEP0(category_group, name, id, step) \
     INTERNAL_TRACE_EVENT_ADD_WITH_ID(TRACE_EVENT_PHASE_FLOW_STEP, \
         category_group, name, id, TRACE_EVENT_FLAG_COPY, "step", step)
 #define TRACE_EVENT_COPY_FLOW_STEP1(category_group, name, id, step, \
         arg1_name, arg1_val) \
     INTERNAL_TRACE_EVENT_ADD_WITH_ID(TRACE_EVENT_PHASE_FLOW_STEP, \
         category_group, name, id, TRACE_EVENT_FLAG_COPY, "step", step, \
         arg1_name, arg1_val)
 // Records a single FLOW_END event for "name" immediately. If the category
 // is not enabled, then this does nothing.
 #define TRACE_EVENT_FLOW_END0(category_group, name, id) \
     INTERNAL_TRACE_EVENT_ADD_WITH_ID(TRACE_EVENT_PHASE_FLOW_END, \
         category_group, name, id, TRACE_EVENT_FLAG_NONE)
 #define TRACE_EVENT_FLOW_END1(category_group, name, id, arg1_name, arg1_val) \
     INTERNAL_TRACE_EVENT_ADD_WITH_ID(TRACE_EVENT_PHASE_FLOW_END, \
         category_group, name, id, TRACE_EVENT_FLAG_NONE, arg1_name, arg1_val)
 #define TRACE_EVENT_FLOW_END2(category_group, name, id, arg1_name, arg1_val, \
         arg2_name, arg2_val) \
     INTERNAL_TRACE_EVENT_ADD_WITH_ID(TRACE_EVENT_PHASE_FLOW_END, \
         category_group, name, id, TRACE_EVENT_FLAG_NONE, \
         arg1_name, arg1_val, arg2_name, arg2_val)
 #define TRACE_EVENT_COPY_FLOW_END0(category_group, name, id) \
     INTERNAL_TRACE_EVENT_ADD_WITH_ID(TRACE_EVENT_PHASE_FLOW_END, \
         category_group, name, id, TRACE_EVENT_FLAG_COPY)
 #define TRACE_EVENT_COPY_FLOW_END1(category_group, name, id, arg1_name, \
         arg1_val) \
     INTERNAL_TRACE_EVENT_ADD_WITH_ID(TRACE_EVENT_PHASE_FLOW_END, \
         category_group, name, id, TRACE_EVENT_FLAG_COPY, \
         arg1_name, arg1_val)
 #define TRACE_EVENT_COPY_FLOW_END2(category_group, name, id, arg1_name, \
         arg1_val, arg2_name, arg2_val) \
     INTERNAL_TRACE_EVENT_ADD_WITH_ID(TRACE_EVENT_PHASE_FLOW_END, \
         category_group, name, id, TRACE_EVENT_FLAG_COPY, \
         arg1_name, arg1_val, arg2_name, arg2_val)
 // Macros to track the life time and value of arbitrary client objects.
 // See also TraceTrackableObject.
 #define TRACE_EVENT_OBJECT_CREATED_WITH_ID(category_group, name, id) \
     INTERNAL_TRACE_EVENT_ADD_WITH_ID(TRACE_EVENT_PHASE_CREATE_OBJECT, \
         category_group, name, TRACE_ID_DONT_MANGLE(id), TRACE_EVENT_FLAG_NONE)
 #define TRACE_EVENT_OBJECT_SNAPSHOT_WITH_ID(category_group, name, id, snapshot) \
     INTERNAL_TRACE_EVENT_ADD_WITH_ID(TRACE_EVENT_PHASE_SNAPSHOT_OBJECT, \
         category_group, name, TRACE_ID_DONT_MANGLE(id), TRACE_EVENT_FLAG_NONE,\
         "snapshot", snapshot)
 #define TRACE_EVENT_OBJECT_DELETED_WITH_ID(category_group, name, id) \
     INTERNAL_TRACE_EVENT_ADD_WITH_ID(TRACE_EVENT_PHASE_DELETE_OBJECT, \
         category_group, name, TRACE_ID_DONT_MANGLE(id), TRACE_EVENT_FLAG_NONE)
 #define INTERNAL_TRACE_EVENT_CATEGORY_GROUP_ENABLED_FOR_RECORDING_MODE() \
     *INTERNAL_TRACE_EVENT_UID(category_group_enabled) & \
         (SkEventTracer::kEnabledForRecording_CategoryGroupEnabledFlags | \
          SkEventTracer::kEnabledForEventCallback_CategoryGroupEnabledFlags)
 // Macro to efficiently determine if a given category group is enabled.
 #define TRACE_EVENT_CATEGORY_GROUP_ENABLED(category_group, ret) \
     do { \
       INTERNAL_TRACE_EVENT_GET_CATEGORY_INFO(category_group); \
       if (INTERNAL_TRACE_EVENT_CATEGORY_GROUP_ENABLED_FOR_RECORDING_MODE()) { \
         *ret = true; \
       } else { \
         *ret = false; \
       } \
     } while (0)
 // Macro to efficiently determine, through polling, if a new trace has begun.
 #define TRACE_EVENT_IS_NEW_TRACE(ret) \
     do { \
       static int INTERNAL_TRACE_EVENT_UID(lastRecordingNumber) = 0; \
       int num_traces_recorded = TRACE_EVENT_API_GET_NUM_TRACES_RECORDED(); \
       if (num_traces_recorded != -1 && \
           num_traces_recorded != \
           INTERNAL_TRACE_EVENT_UID(lastRecordingNumber)) { \
         INTERNAL_TRACE_EVENT_UID(lastRecordingNumber) = \
             num_traces_recorded; \
         *ret = true; \
       } else { \
         *ret = false; \
       } \
     } while (0)
 ////////////////////////////////////////////////////////////////////////////////
 // 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 group. 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 uint8_t*
 //     TRACE_EVENT_API_GET_CATEGORY_GROUP_ENABLED(const char* category_group)
 #define TRACE_EVENT_API_GET_CATEGORY_GROUP_ENABLED \
     SkEventTracer::GetInstance()->getCategoryGroupEnabled
 // Get the number of times traces have been recorded. This is used to implement
 // the TRACE_EVENT_IS_NEW_TRACE facility.
 // unsigned int TRACE_EVENT_API_GET_NUM_TRACES_RECORDED()
 #define TRACE_EVENT_API_GET_NUM_TRACES_RECORDED \
     SkEventTracer::GetInstance()->getNumTracesRecorded
 // Add a trace event to the platform tracing system.
 // SkEventTracer::Handle TRACE_EVENT_API_ADD_TRACE_EVENT(
 //                    char phase,
 //                    const uint8_t* category_group_enabled,
 //                    const char* name,
 //                    uint64_t id,
 //                    int num_args,
 //                    const char** arg_names,
 //                    const uint8_t* arg_types,
 //                    const uint64_t* arg_values,
 //                    unsigned char flags)
 #define TRACE_EVENT_API_ADD_TRACE_EVENT \
     SkEventTracer::GetInstance()->addTraceEvent
 // Set the duration field of a COMPLETE trace event.
 // void TRACE_EVENT_API_UPDATE_TRACE_EVENT_DURATION(
 //     const uint8_t* category_group_enabled,
 //     const char* name,
 //     SkEventTracer::Handle id)
 #define TRACE_EVENT_API_UPDATE_TRACE_EVENT_DURATION \
     SkEventTracer::GetInstance()->updateTraceEventDuration
 // These operations are atomic in the Chrome tracing implementation
 // to cater to ARM's weak memory consistency; we're just doing read/
 // write here because it's not strictly needed for correctness.
 // So says Nat.
 // FIXME
 #define TRACE_EVENT_API_ATOMIC_WORD intptr_t
 #define TRACE_EVENT_API_ATOMIC_LOAD(var) (*(&var))
 #define TRACE_EVENT_API_ATOMIC_STORE(var, value) (var=value)
 // Defines visibility for classes in trace_event.h
 #define TRACE_EVENT_API_CLASS_EXPORT SK_API
 // The thread buckets for the sampling profiler.
 TRACE_EVENT_API_CLASS_EXPORT extern \
     TRACE_EVENT_API_ATOMIC_WORD g_trace_state[3];
 #define TRACE_EVENT_API_THREAD_BUCKET(thread_bucket)                           \
     g_trace_state[thread_bucket]
 ////////////////////////////////////////////////////////////////////////////////
 // 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 collisions.
 #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 INTERNAL_TRACE_EVENT_UID(name_prefix) \
     INTERNAL_TRACE_EVENT_UID2(name_prefix, __LINE__)
 // Implementation detail: internal macro to create static category.
 // No barriers are needed, because this code is designed to operate safely
 // even when the unsigned char* points to garbage data (which may be the case
 // on processors without cache coherency).
 #define INTERNAL_TRACE_EVENT_GET_CATEGORY_INFO_CUSTOM_VARIABLES( \
     category_group, atomic, category_group_enabled) \
     category_group_enabled = \
         reinterpret_cast<const uint8_t*>(TRACE_EVENT_API_ATOMIC_LOAD( \
             atomic)); \
     if (!category_group_enabled) { \
       category_group_enabled = \
           TRACE_EVENT_API_GET_CATEGORY_GROUP_ENABLED(category_group); \
       TRACE_EVENT_API_ATOMIC_STORE(atomic, \
           reinterpret_cast<TRACE_EVENT_API_ATOMIC_WORD>( \
               category_group_enabled)); \
     }
 #define INTERNAL_TRACE_EVENT_GET_CATEGORY_INFO(category_group) \
     static TRACE_EVENT_API_ATOMIC_WORD INTERNAL_TRACE_EVENT_UID(atomic) = 0; \
     const uint8_t* INTERNAL_TRACE_EVENT_UID(category_group_enabled); \
     INTERNAL_TRACE_EVENT_GET_CATEGORY_INFO_CUSTOM_VARIABLES(category_group, \
         INTERNAL_TRACE_EVENT_UID(atomic), \
         INTERNAL_TRACE_EVENT_UID(category_group_enabled));
 // Implementation detail: internal macro to create static category and add
 // event if the category is enabled.
 #define INTERNAL_TRACE_EVENT_ADD(phase, category_group, name, flags, ...) \
     do { \
       INTERNAL_TRACE_EVENT_GET_CATEGORY_INFO(category_group); \
       if (INTERNAL_TRACE_EVENT_CATEGORY_GROUP_ENABLED_FOR_RECORDING_MODE()) { \
         skia::tracing_internals::AddTraceEvent( \
             phase, INTERNAL_TRACE_EVENT_UID(category_group_enabled), name, \
             skia::tracing_internals::kNoEventId, 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_group, name, ...) \
     INTERNAL_TRACE_EVENT_GET_CATEGORY_INFO(category_group); \
     skia::tracing_internals::ScopedTracer INTERNAL_TRACE_EVENT_UID(tracer); \
     if (INTERNAL_TRACE_EVENT_CATEGORY_GROUP_ENABLED_FOR_RECORDING_MODE()) { \
       SkEventTracer::Handle h = skia::tracing_internals::AddTraceEvent( \
           TRACE_EVENT_PHASE_COMPLETE, \
           INTERNAL_TRACE_EVENT_UID(category_group_enabled), \
           name, skia::tracing_internals::kNoEventId, \
           TRACE_EVENT_FLAG_NONE, ##__VA_ARGS__); \
       INTERNAL_TRACE_EVENT_UID(tracer).Initialize( \
           INTERNAL_TRACE_EVENT_UID(category_group_enabled), 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_group, name, id, \
                                          flags, ...) \
     do { \
       INTERNAL_TRACE_EVENT_GET_CATEGORY_INFO(category_group); \
       if (INTERNAL_TRACE_EVENT_CATEGORY_GROUP_ENABLED_FOR_RECORDING_MODE()) { \
         unsigned char trace_event_flags = flags | TRACE_EVENT_FLAG_HAS_ID; \
         skia::tracing_internals::TraceID trace_event_trace_id( \
             id, &trace_event_flags); \
         skia::tracing_internals::AddTraceEvent( \
             phase, INTERNAL_TRACE_EVENT_UID(category_group_enabled), \
             name, trace_event_trace_id.data(), trace_event_flags, \
             ##__VA_ARGS__); \
       } \
     } while (0)
 // Implementation detail: internal macro to create static category and add
 // event if the category is enabled.
 #define INTERNAL_TRACE_EVENT_ADD_WITH_ID_TID_AND_TIMESTAMP(phase, \
         category_group, name, id, thread_id, flags, ...) \
     do { \
       INTERNAL_TRACE_EVENT_GET_CATEGORY_INFO(category_group); \
       if (INTERNAL_TRACE_EVENT_CATEGORY_GROUP_ENABLED_FOR_RECORDING_MODE()) { \
         unsigned char trace_event_flags = flags | TRACE_EVENT_FLAG_HAS_ID; \
         skia::tracing_internals::TraceID trace_event_trace_id( \
             id, &trace_event_flags); \
         skia::tracing_internals::AddTraceEventWithThreadIdAndTimestamp( \
             phase, INTERNAL_TRACE_EVENT_UID(category_group_enabled), \
             name, trace_event_trace_id.data(), \
             thread_id, base::TimeTicks::FromInternalValue(timestamp), \
             trace_event_flags, ##__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')
 #define TRACE_EVENT_PHASE_INSTANT  ('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_FLOW_BEGIN ('s')
 #define TRACE_EVENT_PHASE_FLOW_STEP  ('t')
 #define TRACE_EVENT_PHASE_FLOW_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_SNAPSHOT_OBJECT ('O')
 #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<unsigned char>(0))
 #define TRACE_EVENT_FLAG_COPY         (static_cast<unsigned char>(1 << 0))
 #define TRACE_EVENT_FLAG_HAS_ID       (static_cast<unsigned char>(1 << 1))
 #define TRACE_EVENT_FLAG_MANGLE_ID    (static_cast<unsigned char>(1 << 2))
 #define TRACE_EVENT_FLAG_SCOPE_OFFSET (static_cast<unsigned char>(1 << 3))
 #define TRACE_EVENT_FLAG_SCOPE_MASK   (static_cast<unsigned char>( \
     TRACE_EVENT_FLAG_SCOPE_OFFSET | (TRACE_EVENT_FLAG_SCOPE_OFFSET << 1)))
 // Type values for identifying types in the TraceValue union.
 #define TRACE_VALUE_TYPE_BOOL         (static_cast<unsigned char>(1))
 #define TRACE_VALUE_TYPE_UINT         (static_cast<unsigned char>(2))
 #define TRACE_VALUE_TYPE_INT          (static_cast<unsigned char>(3))
 #define TRACE_VALUE_TYPE_DOUBLE       (static_cast<unsigned char>(4))
 #define TRACE_VALUE_TYPE_POINTER      (static_cast<unsigned char>(5))
 #define TRACE_VALUE_TYPE_STRING       (static_cast<unsigned char>(6))
 #define TRACE_VALUE_TYPE_COPY_STRING  (static_cast<unsigned char>(7))
 #define TRACE_VALUE_TYPE_CONVERTABLE  (static_cast<unsigned char>(8))
 // Enum reflecting the scope of an INSTANT event. Must fit within
 // TRACE_EVENT_FLAG_SCOPE_MASK.
 #define TRACE_EVENT_SCOPE_GLOBAL  (static_cast<unsigned char>(0 << 3))
 #define TRACE_EVENT_SCOPE_PROCESS (static_cast<unsigned char>(1 << 3))
 #define TRACE_EVENT_SCOPE_THREAD  (static_cast<unsigned char>(2 << 3))
 #define TRACE_EVENT_SCOPE_NAME_GLOBAL  ('g')
 #define TRACE_EVENT_SCOPE_NAME_PROCESS ('p')
 #define TRACE_EVENT_SCOPE_NAME_THREAD  ('t')
 namespace skia {
 namespace tracing_internals {
 // Specify these values when the corresponding argument of AddTraceEvent is not
 // used.
 const int kZeroNumArgs = 0;
 const uint64_t kNoEventId = 0;
 // TraceID encapsulates an ID that can either be an integer or pointer. Pointers
 // are by default mangled with the Process ID so that they are unlikely to
 // collide when the same pointer is used on different processes.
 class TraceID {
  public:
   class DontMangle {
    public:
     explicit DontMangle(const void* id)
         : data_(static_cast<uint64_t>(
               reinterpret_cast<unsigned long>(id))) {}
     explicit DontMangle(uint64_t id) : data_(id) {}
     explicit DontMangle(unsigned int id) : data_(id) {}
     explicit DontMangle(unsigned short id) : data_(id) {}
     explicit DontMangle(unsigned char id) : data_(id) {}
     explicit DontMangle(long long id)
         : data_(static_cast<uint64_t>(id)) {}
     explicit DontMangle(long id)
         : data_(static_cast<uint64_t>(id)) {}
     explicit DontMangle(int id)
         : data_(static_cast<uint64_t>(id)) {}
     explicit DontMangle(short id)
         : data_(static_cast<uint64_t>(id)) {}
     explicit DontMangle(signed char id)
         : data_(static_cast<uint64_t>(id)) {}
     uint64_t data() const { return data_; }
    private:
     uint64_t data_;
   };
   class ForceMangle {
    public:
     explicit ForceMangle(uint64_t id) : data_(id) {}
     explicit ForceMangle(unsigned int id) : data_(id) {}
     explicit ForceMangle(unsigned short id) : data_(id) {}
     explicit ForceMangle(unsigned char id) : data_(id) {}
     explicit ForceMangle(long long id)
         : data_(static_cast<uint64_t>(id)) {}
     explicit ForceMangle(long id)
         : data_(static_cast<uint64_t>(id)) {}
     explicit ForceMangle(int id)
         : data_(static_cast<uint64_t>(id)) {}
     explicit ForceMangle(short id)
         : data_(static_cast<uint64_t>(id)) {}
     explicit ForceMangle(signed char id)
         : data_(static_cast<uint64_t>(id)) {}
     uint64_t data() const { return data_; }
    private:
     uint64_t data_;
   };
   TraceID(const void* id, unsigned char* flags)
       : data_(static_cast<uint64_t>(
               reinterpret_cast<unsigned long>(id))) {
     *flags |= TRACE_EVENT_FLAG_MANGLE_ID;
   }
   TraceID(ForceMangle id, unsigned char* flags) : data_(id.data()) {
     *flags |= TRACE_EVENT_FLAG_MANGLE_ID;
   }
   TraceID(DontMangle id, unsigned char* flags) : data_(id.data()) {
   }
   TraceID(uint64_t id, unsigned char* flags)
       : data_(id) { (void)flags; }
   TraceID(unsigned int id, unsigned char* flags)
       : data_(id) { (void)flags; }
   TraceID(unsigned short id, unsigned char* flags)
       : data_(id) { (void)flags; }
   TraceID(unsigned char id, unsigned char* flags)
       : data_(id) { (void)flags; }
   TraceID(long long id, unsigned char* flags)
       : data_(static_cast<uint64_t>(id)) { (void)flags; }
   TraceID(long id, unsigned char* flags)
       : data_(static_cast<uint64_t>(id)) { (void)flags; }
   TraceID(int id, unsigned char* flags)
       : data_(static_cast<uint64_t>(id)) { (void)flags; }
   TraceID(short id, unsigned char* flags)
       : data_(static_cast<uint64_t>(id)) { (void)flags; }
   TraceID(signed char id, unsigned char* flags)
       : data_(static_cast<uint64_t>(id)) { (void)flags; }
   uint64_t data() const { return data_; }
  private:
   uint64_t data_;
 };
 // Simple union to store various types as uint64_t.
 union TraceValueUnion {
   bool as_bool;
   uint64_t as_uint;
   long long as_int;
   double as_double;
   const void* as_pointer;
   const char* as_string;
 };
 // Simple container for const char* that should be copied instead of retained.
 class TraceStringWithCopy {
  public:
   explicit TraceStringWithCopy(const char* str) : str_(str) {}
   operator const char* () const { return str_; }
  private:
   const char* 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, \
         uint64_t* value) { \
       TraceValueUnion type_value; \
       type_value.union_member = arg; \
       *type = value_type_id; \
       *value = type_value.as_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, \
         uint64_t* value) { \
       *type = value_type_id; \
       *value = static_cast<uint64_t>(arg); \
     }
 INTERNAL_DECLARE_SET_TRACE_VALUE_INT(uint64_t, 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(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, as_bool, TRACE_VALUE_TYPE_BOOL)
 INTERNAL_DECLARE_SET_TRACE_VALUE(double, as_double, TRACE_VALUE_TYPE_DOUBLE)
 INTERNAL_DECLARE_SET_TRACE_VALUE(const void*, as_pointer,
                                  TRACE_VALUE_TYPE_POINTER)
 INTERNAL_DECLARE_SET_TRACE_VALUE(const char*, as_string,
                                  TRACE_VALUE_TYPE_STRING)
 INTERNAL_DECLARE_SET_TRACE_VALUE(const TraceStringWithCopy&, as_string,
                                  TRACE_VALUE_TYPE_COPY_STRING)
 #undef INTERNAL_DECLARE_SET_TRACE_VALUE
 #undef INTERNAL_DECLARE_SET_TRACE_VALUE_INT
 // These AddTraceEvent and AddTraceEvent template
 // functions are defined here instead of in the macro, because the arg_values
 // could be temporary objects, such as std::string. 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 SkEventTracer::Handle
 AddTraceEvent(
     char phase,
     const uint8_t* category_group_enabled,
     const char* name,
     uint64_t id,
     unsigned char flags) {
   return TRACE_EVENT_API_ADD_TRACE_EVENT(
       phase, category_group_enabled, name, id,
       kZeroNumArgs, NULL, NULL, NULL, flags);
 }
 template<class ARG1_TYPE>
 static inline SkEventTracer::Handle
 AddTraceEvent(
     char phase,
     const uint8_t* category_group_enabled,
     const char* name,
     uint64_t id,
     unsigned char flags,
     const char* arg1_name,
     const ARG1_TYPE& arg1_val) {
   const int num_args = 1;
   uint8_t arg_types[1];
   uint64_t arg_values[1];
   SetTraceValue(arg1_val, &arg_types[0], &arg_values[0]);
   return TRACE_EVENT_API_ADD_TRACE_EVENT(
       phase, category_group_enabled, name, id,
       num_args, &arg1_name, arg_types, arg_values, flags);
 }
 template<class ARG1_TYPE, class ARG2_TYPE>
 static inline SkEventTracer::Handle
 AddTraceEvent(
     char phase,
     const uint8_t* category_group_enabled,
     const char* name,
     uint64_t id,
     unsigned char flags,
     const char* arg1_name,
     const ARG1_TYPE& arg1_val,
     const char* arg2_name,
     const ARG2_TYPE& arg2_val) {
   const int num_args = 2;
   const char* arg_names[2] = { arg1_name, arg2_name };
   unsigned char arg_types[2];
   uint64_t arg_values[2];
   SetTraceValue(arg1_val, &arg_types[0], &arg_values[0]);
   SetTraceValue(arg2_val, &arg_types[1], &arg_values[1]);
   return TRACE_EVENT_API_ADD_TRACE_EVENT(
       phase, category_group_enabled, name, id,
       num_args, arg_names, arg_types, arg_values, flags);
 }
 // Used by TRACE_EVENTx macros. Do not use directly.
 class TRACE_EVENT_API_CLASS_EXPORT ScopedTracer {
  public:
   // Note: members of data_ intentionally left uninitialized. See Initialize.
   ScopedTracer() : p_data_(NULL) {}
   ~ScopedTracer() {
     if (p_data_ && *data_.category_group_enabled)
       TRACE_EVENT_API_UPDATE_TRACE_EVENT_DURATION(
           data_.category_group_enabled, data_.name, data_.event_handle);
   }
   void Initialize(const uint8_t* category_group_enabled,
                   const char* name,
                   SkEventTracer::Handle event_handle) {
     data_.category_group_enabled = category_group_enabled;
     data_.name = name;
     data_.event_handle = event_handle;
     p_data_ = &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 uint8_t* category_group_enabled;
     const char* name;
     SkEventTracer::Handle event_handle;
   };
   Data* p_data_;
   Data data_;
 };
 // Used by TRACE_EVENT_BINARY_EFFICIENTx macro. Do not use directly.
 class TRACE_EVENT_API_CLASS_EXPORT ScopedTraceBinaryEfficient {
  public:
   ScopedTraceBinaryEfficient(const char* category_group, const char* name);
   ~ScopedTraceBinaryEfficient();
  private:
   const uint8_t* category_group_enabled_;
   const char* name_;
   SkEventTracer::Handle event_handle_;
 };
 // This macro generates less code then TRACE_EVENT0 but is also
 // slower to execute when tracing is off. It should generally only be
 // used with code that is seldom executed or conditionally executed
 // when debugging.
 // For now the category_group must be "gpu".
 #define TRACE_EVENT_BINARY_EFFICIENT0(category_group, name) \
     skia::tracing_internals::ScopedTraceBinaryEfficient \
         INTERNAL_TRACE_EVENT_UID(scoped_trace)(category_group, name);
 // TraceEventSamplingStateScope records the current sampling state
 // and sets a new sampling state. When the scope exists, it restores
 // the sampling state having recorded.
 template<size_t BucketNumber>
 class TraceEventSamplingStateScope {
  public:
   TraceEventSamplingStateScope(const char* category_and_name) {
     previous_state_ = TraceEventSamplingStateScope<BucketNumber>::Current();
     TraceEventSamplingStateScope<BucketNumber>::Set(category_and_name);
   }
   ~TraceEventSamplingStateScope() {
     TraceEventSamplingStateScope<BucketNumber>::Set(previous_state_);
   }
   static inline const char* Current() {
     return reinterpret_cast<const char*>(TRACE_EVENT_API_ATOMIC_LOAD(
       g_trace_state[BucketNumber]));
   }
   static inline void Set(const char* category_and_name) {
     TRACE_EVENT_API_ATOMIC_STORE(
       g_trace_state[BucketNumber],
       reinterpret_cast<TRACE_EVENT_API_ATOMIC_WORD>(
         const_cast<char*>(category_and_name)));
   }
  private:
   const char* previous_state_;
 };
 }  // namespace tracing_internals
 }  // namespace skia
 #endif

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gfx/skia/trunk/src/core/SkTraceEvent.h@129ffea94266 (annotated)

gfx/skia/trunk/src/core/SkTraceEvent.h