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cef/include/cef_trace_event.h
Marshall Greenblatt d6f47eba76 Create 1916 release branch for CEF3. 
git-svn-id: https://chromiumembedded.googlecode.com/svn/branches/1916@1654 5089003a-bbd8-11dd-ad1f-f1f9622dbc98
2014-04-11 21:13:32 +00:00

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// Copyright (c) 2012 Marshall A. Greenblatt. Portions copyright (c) 2012
// 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:
//
// * Redistributions of source code must retain the above copyright
// notice, this list of conditions and the following disclaimer.
// * Redistributions in binary form must reproduce the above
// copyright notice, this list of conditions and the following disclaimer
// in the documentation and/or other materials provided with the
// distribution.
// * Neither the name of Google Inc. nor the name Chromium Embedded
// Framework nor the names of its contributors may be used to endorse
// or promote products derived from this software without specific prior
// written permission.
//
// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
///
// 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:
// CEF_TRACE_EVENT_INSTANT0("MY_SUBSYSTEM", "SomeImportantEvent")
//
// Events can be INSTANT, or can be pairs of BEGIN and END in the same scope:
// CEF_TRACE_EVENT_BEGIN0("MY_SUBSYSTEM", "SomethingCostly")
// doSomethingCostly()
// CEF_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() {
// CEF_TRACE_EVENT0("MY_SUBSYSTEM", "doSomethingCostly");
// ...
// }
//
// Additional parameters can be associated with an event:
// void doSomethingCostly2(int howMuch) {
// CEF_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;
// CEF_TRACE_EVENT_ASYNC_BEGIN0("ipc", "message", send_count);
// Send(new MyMessage(send_count));
// [receive code]
// void OnMyMessage(send_count) {
// CEF_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() {
// CEF_TRACE_EVENT_ASYNC_BEGIN0("category", "MyTracedClass", this);
// }
// ~MyTracedClass() {
// CEF_TRACE_EVENT_ASYNC_END0("category", "MyTracedClass", this);
// }
// }
//
// The 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:
// CEF_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:
// CEF_TRACE_COUNTER1("MY_SUBSYSTEM", "myCounter0", g_myCounterValue[0]);
// CEF_TRACE_COUNTER1("MY_SUBSYSTEM", "myCounter1", g_myCounterValue[1]);
// Or you can do it with a combined macro:
// CEF_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 CEF_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
// CEF's case, calling BeginTracing will turn on tracing on 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");
// CEF_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
// CEF_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.
//
//
// Thread Safety:
// All macros are thread safe and can be used from any process.
///
#ifndef CEF_INCLUDE_CEF_TRACE_EVENT_H_
#define CEF_INCLUDE_CEF_TRACE_EVENT_H_
#pragma once
#include "include/internal/cef_export.h"
#include "include/internal/cef_types.h"
#ifdef __cplusplus
extern "C" {
#endif
// Functions for tracing counters and functions; called from macros.
// - |category| string must have application lifetime (static or literal). They
// may not include "(quotes) chars.
// - |argX_name|, |argX_val|, |valueX_name|, |valeX_val| are optional parameters
// and represent pairs of name and values of arguments
// - |copy| is used to avoid memory scoping issues with the |name| and
// |arg_name| parameters by copying them
// - |id| is used to disambiguate counters with the same name, or match async
// trace events
CEF_EXPORT void cef_trace_event_instant(const char* category,
const char* name,
const char* arg1_name,
uint64 arg1_val,
const char* arg2_name,
uint64 arg2_val,
int copy);
CEF_EXPORT void cef_trace_event_begin(const char* category,
const char* name,
const char* arg1_name,
uint64 arg1_val,
const char* arg2_name,
uint64 arg2_val,
int copy);
CEF_EXPORT void cef_trace_event_end(const char* category,
const char* name,
const char* arg1_name,
uint64 arg1_val,
const char* arg2_name,
uint64 arg2_val,
int copy);
CEF_EXPORT void cef_trace_counter(const char* category,
const char* name,
const char* value1_name,
uint64 value1_val,
const char* value2_name,
uint64 value2_val,
int copy);
CEF_EXPORT void cef_trace_counter_id(const char* category,
const char* name,
uint64 id,
const char* value1_name,
uint64 value1_val,
const char* value2_name,
uint64 value2_val,
int copy);
CEF_EXPORT void cef_trace_event_async_begin(const char* category,
const char* name,
uint64 id,
const char* arg1_name,
uint64 arg1_val,
const char* arg2_name,
uint64 arg2_val,
int copy);
CEF_EXPORT void cef_trace_event_async_step_into(const char* category,
const char* name,
uint64 id,
uint64 step,
const char* arg1_name,
uint64 arg1_val,
int copy);
CEF_EXPORT void cef_trace_event_async_step_past(const char* category,
const char* name,
uint64 id,
uint64 step,
const char* arg1_name,
uint64 arg1_val,
int copy);
CEF_EXPORT void cef_trace_event_async_end(const char* category,
const char* name,
uint64 id,
const char* arg1_name,
uint64 arg1_val,
const char* arg2_name,
uint64 arg2_val,
int copy);
#ifdef __cplusplus
}
#endif
// 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 CEF_TRACE_EVENT0(category, name) \
cef_trace_event_begin(category, name, NULL, 0, NULL, 0, false); \
CEF_INTERNAL_TRACE_END_ON_SCOPE_CLOSE(category, name)
#define CEF_TRACE_EVENT1(category, name, arg1_name, arg1_val) \
cef_trace_event_begin(category, name, arg1_name, arg1_val, NULL, 0, false); \
CEF_INTERNAL_TRACE_END_ON_SCOPE_CLOSE(category, name)
#define CEF_TRACE_EVENT2(category, name, arg1_name, arg1_val, arg2_name, \
arg2_val) \
cef_trace_event_begin(category, name, arg1_name, arg1_val, \
arg2_name, arg2_val, false); \
CEF_INTERNAL_TRACE_END_ON_SCOPE_CLOSE(category, name)
// Implementation detail: trace event macros create temporary variable names.
// These macros give each temporary variable a unique name based on the line
// number to prevent name collisions.
#define CEF_INTERNAL_TRACE_EVENT_UID3(a,b) \
cef_trace_event_unique_##a##b
#define CEF_INTERNAL_TRACE_EVENT_UID2(a,b) \
CEF_INTERNAL_TRACE_EVENT_UID3(a,b)
#define CEF_INTERNAL_TRACE_EVENT_UID(name_prefix) \
CEF_INTERNAL_TRACE_EVENT_UID2(name_prefix, __LINE__)
// Implementation detail: internal macro to end end event when the scope ends.
#define CEF_INTERNAL_TRACE_END_ON_SCOPE_CLOSE(category, name) \
cef_trace_event_internal::CefTraceEndOnScopeClose \
CEF_INTERNAL_TRACE_EVENT_UID(profileScope)(category, name)
// 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 CEF_TRACE_EVENT_INSTANT0(category, name) \
cef_trace_event_instant(category, name, NULL, 0, NULL, 0, false)
#define CEF_TRACE_EVENT_INSTANT1(category, name, arg1_name, arg1_val) \
cef_trace_event_instant(category, name, arg1_name, arg1_val, NULL, 0, false)
#define CEF_TRACE_EVENT_INSTANT2(category, name, arg1_name, arg1_val, \
arg2_name, arg2_val) \
cef_trace_event_instant(category, name, arg1_name, arg1_val, arg2_name, \
arg2_val, false)
#define CEF_TRACE_EVENT_COPY_INSTANT0(category, name) \
cef_trace_event_instant(category, name, NULL, 0, NULL, 0, true)
#define CEF_TRACE_EVENT_COPY_INSTANT1(category, name, arg1_name, arg1_val) \
cef_trace_event_instant(category, name, arg1_name, arg1_val, NULL, 0, true)
#define CEF_TRACE_EVENT_COPY_INSTANT2(category, name, arg1_name, arg1_val, \
arg2_name, arg2_val) \
cef_trace_event_instant(category, name, arg1_name, arg1_val, arg2_name, \
arg2_val, true)
// 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 CEF_TRACE_EVENT_BEGIN0(category, name) \
cef_trace_event_begin(category, name, NULL, 0, NULL, 0, false)
#define CEF_TRACE_EVENT_BEGIN1(category, name, arg1_name, arg1_val) \
cef_trace_event_begin(category, name, arg1_name, arg1_val, NULL, 0, false)
#define CEF_TRACE_EVENT_BEGIN2(category, name, arg1_name, arg1_val, \
arg2_name, arg2_val) \
cef_trace_event_begin(category, name, arg1_name, arg1_val, arg2_name, \
arg2_val, false)
#define CEF_TRACE_EVENT_COPY_BEGIN0(category, name) \
cef_trace_event_begin(category, name, NULL, 0, NULL, 0, true)
#define CEF_TRACE_EVENT_COPY_BEGIN1(category, name, arg1_name, arg1_val) \
cef_trace_event_begin(category, name, arg1_name, arg1_val, NULL, 0, true)
#define CEF_TRACE_EVENT_COPY_BEGIN2(category, name, arg1_name, arg1_val, \
arg2_name, arg2_val) \
cef_trace_event_begin(category, name, arg1_name, arg1_val, arg2_name, \
arg2_val, true)
// 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 CEF_TRACE_EVENT_END0(category, name) \
cef_trace_event_end(category, name, NULL, 0, NULL, 0, false)
#define CEF_TRACE_EVENT_END1(category, name, arg1_name, arg1_val) \
cef_trace_event_end(category, name, arg1_name, arg1_val, NULL, 0, false)
#define CEF_TRACE_EVENT_END2(category, name, arg1_name, arg1_val, \
arg2_name, arg2_val) \
cef_trace_event_end(category, name, arg1_name, arg1_val, arg2_name, \
arg2_val, false)
#define CEF_TRACE_EVENT_COPY_END0(category, name) \
cef_trace_event_end(category, name, NULL, 0, NULL, 0, true)
#define CEF_TRACE_EVENT_COPY_END1(category, name, arg1_name, arg1_val) \
cef_trace_event_end(category, name, arg1_name, arg1_val, NULL, 0, true)
#define CEF_TRACE_EVENT_COPY_END2(category, name, arg1_name, arg1_val, \
arg2_name, arg2_val) \
cef_trace_event_end(category, name, arg1_name, arg1_val, arg2_name, \
arg2_val, true)
// 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 CEF_TRACE_COUNTER1(category, name, value) \
cef_trace_counter(category, name, NULL, value, NULL, 0, false)
#define CEF_TRACE_COPY_COUNTER1(category, name, value) \
cef_trace_counter(category, name, NULL, value, NULL, 0, true)
// 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 CEF_TRACE_COUNTER2(category, name, value1_name, value1_val, \
value2_name, value2_val) \
cef_trace_counter(category, name, value1_name, value1_val, value2_name, \
value2_val, false)
#define CEF_TRACE_COPY_COUNTER2(category, name, value1_name, value1_val, \
value2_name, value2_val) \
cef_trace_counter(category, name, value1_name, value1_val, value2_name, \
value2_val, true)
// 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 CEF_TRACE_COUNTER_ID1(category, name, id, value) \
cef_trace_counter_id(category, name, id, NULL, value, NULL, 0, false)
#define CEF_TRACE_COPY_COUNTER_ID1(category, name, id, value) \
cef_trace_counter_id(category, name, id, NULL, value, NULL, 0, true)
// 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 CEF_TRACE_COUNTER_ID2(category, name, id, value1_name, value1_val, \
value2_name, value2_val) \
cef_trace_counter_id(category, name, id, value1_name, value1_val, \
value2_name, value2_val, false)
#define CEF_TRACE_COPY_COUNTER_ID2(category, name, id, value1_name, \
value1_val, value2_name, value2_val) \
cef_trace_counter_id(category, name, id, value1_name, value1_val, \
value2_name, value2_val, true)
// 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 sothat 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_BEGIN macros. When the operation completes, call ASYNC_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 CEF_TRACE_EVENT_ASYNC_BEGIN0(category, name, id) \
cef_trace_event_async_begin(category, name, id, NULL, 0, NULL, 0, false)
#define CEF_TRACE_EVENT_ASYNC_BEGIN1(category, name, id, arg1_name, arg1_val) \
cef_trace_event_async_begin(category, name, id, arg1_name, arg1_val, NULL, \
0, false)
#define CEF_TRACE_EVENT_ASYNC_BEGIN2(category, name, id, arg1_name, arg1_val, \
arg2_name, arg2_val) \
cef_trace_event_async_begin(category, name, id, arg1_name, arg1_val, \
arg2_name, arg2_val, false)
#define CEF_TRACE_EVENT_COPY_ASYNC_BEGIN0(category, name, id) \
cef_trace_event_async_begin(category, name, id, NULL, 0, NULL, 0, true)
#define CEF_TRACE_EVENT_COPY_ASYNC_BEGIN1(category, name, id, arg1_name, \
arg1_val) \
cef_trace_event_async_begin(category, name, id, arg1_name, arg1_val, NULL, \
0, true)
#define CEF_TRACE_EVENT_COPY_ASYNC_BEGIN2(category, name, id, arg1_name, \
arg1_val, arg2_name, arg2_val) \
cef_trace_event_async_begin(category, name, id, arg1_name, arg1_val, \
arg2_name, arg2_val, true)
// 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 CEF_TRACE_EVENT_ASYNC_STEP_INTO0(category, name, id, step) \
cef_trace_event_async_step_into(category, name, id, step, NULL, 0, false)
#define CEF_TRACE_EVENT_ASYNC_STEP_INTO1(category, name, id, step, \
arg1_name, arg1_val) \
cef_trace_event_async_step_into(category, name, id, step, arg1_name, \
arg1_val, false)
#define CEF_TRACE_EVENT_COPY_ASYNC_STEP_INTO0(category, name, id, step) \
cef_trace_event_async_step_into(category, name, id, step, NULL, 0, true)
#define CEF_TRACE_EVENT_COPY_ASYNC_STEP_INTO1(category, name, id, step, \
arg1_name, arg1_val) \
cef_trace_event_async_step_into(category, name, id, step, arg1_name, \
arg1_val, true)
// 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 CEF_TRACE_EVENT_ASYNC_STEP_PAST0(category, name, id, step) \
cef_trace_event_async_step_past(category, name, id, step, NULL, 0, false)
#define CEF_TRACE_EVENT_ASYNC_STEP_PAST1(category, name, id, step, \
arg1_name, arg1_val) \
cef_trace_event_async_step_past(category, name, id, step, arg1_name, \
arg1_val, false)
#define CEF_TRACE_EVENT_COPY_ASYNC_STEP_PAST0(category, name, id, step) \
cef_trace_event_async_step_past(category, name, id, step, NULL, 0, true)
#define CEF_TRACE_EVENT_COPY_ASYNC_STEP_PAST1(category, name, id, step, \
arg1_name, arg1_val) \
cef_trace_event_async_step_past(category, name, id, step, arg1_name, \
arg1_val, true)
// Records a single ASYNC_END event for "name" immediately. If the category
// is not enabled, then this does nothing.
#define CEF_TRACE_EVENT_ASYNC_END0(category, name, id) \
cef_trace_event_async_end(category, name, id, NULL, 0, NULL, 0, false)
#define CEF_TRACE_EVENT_ASYNC_END1(category, name, id, arg1_name, arg1_val) \
cef_trace_event_async_end(category, name, id, arg1_name, arg1_val, NULL, 0, \
false)
#define CEF_TRACE_EVENT_ASYNC_END2(category, name, id, arg1_name, arg1_val, \
arg2_name, arg2_val) \
cef_trace_event_async_end(category, name, id, arg1_name, arg1_val, \
arg2_name, arg2_val, false)
#define CEF_TRACE_EVENT_COPY_ASYNC_END0(category, name, id) \
cef_trace_event_async_end(category, name, id, NULL, 0, NULL, 0, true)
#define CEF_TRACE_EVENT_COPY_ASYNC_END1(category, name, id, arg1_name, \
arg1_val) \
cef_trace_event_async_end(category, name, id, arg1_name, arg1_val, NULL, 0, \
true)
#define CEF_TRACE_EVENT_COPY_ASYNC_END2(category, name, id, arg1_name, \
arg1_val, arg2_name, arg2_val) \
cef_trace_event_async_end(category, name, id, arg1_name, arg1_val, \
arg2_name, arg2_val, true)
namespace cef_trace_event_internal {
// Used by CEF_TRACE_EVENTx macro. Do not use directly.
class CefTraceEndOnScopeClose {
public:
CefTraceEndOnScopeClose(const char* category, const char* name)
: category_(category), name_(name) {
}
~CefTraceEndOnScopeClose() {
cef_trace_event_end(category_, name_, NULL, 0, NULL, 0, false);
}
private:
const char* category_;
const char* name_;
};
} // cef_trace_event_internal
#endif // CEF_INCLUDE_CEF_TRACE_EVENT_H_
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