--- /dev/null
+= Babeltrace's contributor's guide
+Jérémie Galarneau, Philippe Proulx
+v0.1, 6 September 2017
+:toc:
+:toclevels: 5
+
+
+This is a partial contributor's guide for the
+http://diamon.org/babeltrace[Babeltrace] project. If you have any
+questions that are not answered in this guide, please post them
+on https://lists.lttng.org/cgi-bin/mailman/listinfo/lttng-dev[Babeltrace's mailing list].
+
+
+== Object reference counting and lifetime
+
+This section covers the rationale behind the design of Babeltrace's
+object lifetime management.
+
+Starting from Babeltrace 2.x, all publicly exposed objects inherit a
+common base: `bt_object`. This base provides a number of facilities to
+all objects, chief amongst which are lifetime management functions.
+
+The reference count of all public objects is controlled by invoking the
+`bt_get()` and `bt_put()` functions which respectively increment and
+decrement an object's reference count.
+
+As far as lifetime management in concerned, Babeltrace makes a clear
+distinction between regular objects, which have a single parent, and
+root objects, which don't.
+
+
+=== The problem
+
+Let us consider a problematic case to illustrate the need for this
+distinction.
+
+A user of the CTF Writer library declares a trace, which *has* a
+stream class (the declaration of a stream) and that stream class, in
+turn, *has* an event class (the declaration of an event).
+
+Nothing prevents this user from releasing his reference on any one of
+these objects in any order. However, all objects in the
+__trace--stream class--event class__ hierarchy can be retrieved
+from any other.
+
+For instance, the user could discard his reference on both the event
+class and the stream class, only keeping a reference on the trace. From
+this trace reference, stream classes can be enumerated, providing the
+user with a new reference to the stream class he discarded earlier.
+event classes can also be enumerated from stream classes, providing the
+user with references to the individual event classes.
+
+Conversely, the user could also hold a reference to an event class and
+retrieve its parent stream class. The trace, in turn, can then be
+retrieved from the stream class.
+
+This example illustrates what could be interpreted as a circular
+reference dependency existing between these objects. Of course, if the
+objects in such a scenario were to hold references to each other (in
+both directions), we would be in presence of a circular ownership
+resulting in a leak of both objects as their reference counts would
+never reach zero.
+
+Nonetheless, the API must offer the guarantee that holding a node to any
+node of the graph keeps all other reachable nodes alive.
+
+
+=== The solution
+
+The scheme employed in Babeltrace to break this cycle consists in the
+"children" holding *reverse component references* to their parents. That
+is, in the context of CTF IR, that event classes hold a reference to
+their parent stream class and stream classes hold a reference to their
+parent trace.
+
+On the other hand, parents hold *claiming aggregation references* to
+their children. A claiming aggregation reference means that the object
+being referenced should not be deleted as long as the reference still
+exists. In this respect, it can be said that parents truly hold the
+ownership of their children, since they control their lifetime.
+Conversely, the reference counting mechanism is leveraged by children to
+notify parents that no other child indirectly exposes the parent.
+
+When a parented object's reference count reaches zero, it invokes
+`bt_put()` on its parent and does **not** free itself. However, from
+that point, the object depends on its parent to signal the moment when
+it can be safely reclaimed.
+
+The invocation of `bt_put()` by the last children holding a reference to
+its parent might trigger a cascade of `bt_put()` from child to parent.
+Eventually, a **root** object is reached. At that point, if this
+orphaned object's reference count reaches zero, the object invokes the
+destructor method defined by everyone of its children as part of their
+base `struct bt_object`. The key point here is that the cascade of
+destructor will necessarily originate from the root and propagate in
+preorder to the children. These children will propagate the destruction
+to their own children before reclaiming their own memory. This ensures
+that a node's pointer to its parent is *always* valid since the parent
+has the responsibility of tearing-down their children before cleaning
+themselves up.
+
+Assuming a reference to an object is *acquired* by calling `bt_get()`
+while its reference count is zero, the object acquires, in turn, a
+reference on its parent using `bt_get()`. At that point, the child can
+be thought of as having converted its weak reference to its parent into
+a regular reference. That is why this reference is referred to as a
+*claiming* aggregation reference.
+
+
+=== Caveats
+
+This scheme imposes a number of strict rules defining the relation
+between objects:
+
+* Objects may only have one parent.
+* Objects, beside the root, are only retrievable from their direct
+ parent or children.
+
+
+=== Example
+
+The initial situation is rather simple: **User A** is holding a
+reference to a trace, **TC1**. As per the rules previously enounced,
+stream classes **SC1** and **SC2** don't hold a reference to **TC1**
+since their own reference counts are zero. The same holds true for
+**EC1**, **EC2** and **EC3** with respect to **SC1** and **SC2**.
+
+image::doc/contributing-images/bt-ref01.png[]
+
+In this second step, we can see that **User A** has acquired a reference
+on **SC2** through the trace, **TC1**.
+
+The stream class's reference count transitions from zero to one,
+triggering the acquisition of a strong reference on **TC1** from
+**SC2**.
+
+Hence, at this point, the trace's ownership is shared by **User A** and
+**SC2**.
+
+image::doc/contributing-images/bt-ref02.png[]
+
+Next, **User A** acquires a reference on the **EC3** event class through
+its parent stream class, **SC2**. Again, the transition of an object's
+reference count from 0 to 1 triggers the acquisition of a reference on
+its parent.
+
+Note that SC2's reference count was incremented to 2. The trace's
+reference count remains unchanged.
+
+image::doc/contributing-images/bt-ref03.png[]
+
+**User A** decides to drop its reference on **SC2**. **SC2**'s reference
+count returns back to 1, everything else remaining unchanged.
+
+image::doc/contributing-images/bt-ref04.png[]
+
+**User A** can then decide to drop its reference on the trace. This
+results in a reversal of the initial situation: **User A** now owns an
+event, **EC3**, which is keeping everything else alive and reachable.
+
+image::doc/contributing-images/bt-ref05.png[]
+
+If another object, **User B**, enters the picture and acquires a
+reference on the **SC1** stream class, we see that **SC1**'s reference
+count transitioned from 0 to 1, triggering the acquisition of a
+reference on **TC1**.
+
+image::doc/contributing-images/bt-ref06.png[]
+
+**User B** hands off a reference to **EC1**, acquired through **SC1**,
+to another object, **User C**. The acquisition of a reference on
+**EC1**, which transitions from 0 to 1, triggers the acquisition of a
+reference on its parent, **SC1**.
+
+image::doc/contributing-images/bt-ref07.png[]
+
+At some point, **User A** releases its reference on **EC3**. Since
+**EC3**'s reference count transitions to zero, it releases its reference
+on **SC2**. **SC2**'s reference count, in turn, reaches zero and it
+releases its reference to **TC1**.
+
+**TC1**'s reference count is now 1 and no further action is taken.
+
+image::doc/contributing-images/bt-ref08.png[]
+
+**User B** releases its reference on **SC1**. **User C** becomes the
+sole owner of the whole hierarchy through his ownership of **EC1**.
+
+image::doc/contributing-images/bt-ref09.png[]
+
+Finally, **User C** releases his ownership of **EC1**, triggering the
+release of the whole hierarchy. Let's walk through the reclamation of
+the whole graph.
+
+Mirroring what happened when **User A** released its last reference on
+**EC3**, the release of **EC1** by **User C** causes its reference count
+to fall to zero.
+
+This transition to zero causes **EC1** to release its reference on
+**SC1**. **SC1**'s reference count reaching zero causes it to release
+its reference on **TC1**.
+
+image::doc/contributing-images/bt-ref10.png[]
+
+Since the reference count of **TC1**, a root object, has reached zero,
+it invokes the destructor method on its children. This method is
+recursive and causes the stream classes to call the destructor method on
+their event classes.
+
+The event classes are reached and, having no children of their own, are
+reclaimed.
+
+image::doc/contributing-images/bt-ref11.png[]
+
+The stream classes having destroyed their children, are then reclaimed
+by the trace.
+
+image::doc/contributing-images/bt-ref12.png[]
+
+Finally, the stream classes having been reclaimed, **TC1** is reclaimed.
+
+image::doc/contributing-images/bt-ref13.png[]
+
+
+== Valgrind
+
+To use Valgrind on an application (for example, the CLI or a test) which
+loads libbabeltrace, use:
+
+ $ G_SLICE=always-malloc G_DEBUG=gc-friendly PYTHONMALLOC=malloc \
+ BABELTRACE_NO_DLCLOSE=1 valgrind --leak-check=full \
+ --suppressions=/path/to/babeltrace/extras/valgrind/popt.supp app
+
+`G_SLICE=always-malloc` and `G_DEBUG=gc-friendly` is for GLib and
+`PYTHONMALLOC=malloc` is for the Python interpreter, if it is used by
+the Python plugin provider (Valgrind will probably show a lot of errors
+which originate from Python interpreter anyway).
+
+`BABELTRACE_NO_DLCLOSE=1` makes libbabeltrace not close the shared
+libraries (plugins) which it loads. This is needed to see the
+appropriate backtrace when Valgrind shows errors.
+
+
+== Logging
+
+Logging is a great instrument for a developer to be able to collect
+information about a running software.
+
+Babeltrace is a complex software with many layers. When a Babeltrace
+graph fails to run, what caused the failure? It could be caused by any
+component, any notification iterator, and any deeply nested validation
+of a CTR IR object, for example. With the appropriate logging statements
+manually placed in the source code, we can find the cause of a bug
+faster.
+
+While <<log-level,care must be taken>> when placing _INFO_ to _FATAL_
+logging statements, you should liberally instrument your Babeltrace
+module with _DEBUG_ and _VERBOSE_ logging statements to help future you
+and other developers understand what's happening at run-time.
+
+
+=== Logging API
+
+The Babeltrace logging API is internal: it is not exposed to the users
+of the library, only to their developers. The only thing that a library
+user can control is the current log level of the library itself with
+`bt_logging_set_global_level()` and the initial library's log level with
+the `BABELTRACE_LOGGING_GLOBAL_LEVEL` environment variable.
+
+This API is based on https://github.com/wonder-mice/zf_log[zf_log], a
+lightweight, yet featureful, MIT-licensed core logging library for C and
+$$C++$$. The zf_log source files were modified to have the `BT_` and
+`bt_` prefixes, and other small changes, like color support.
+
+The logging functions are implemented in the logging convenience
+library (`logging` directory).
+
+
+==== Headers
+
+The logging API headers are:
+
+`<babeltrace/logging.h>`::
+ Public header which a library user can use to control and read
+ libbabeltrace's current log level.
+
+`<babeltrace/logging-internal.h>`::
+ Internal, generic logging API which you can use in any Babeltrace
+ subproject. This is the translation of `zf_log.h`.
+
+`<babeltrace/lib-logging-internal.h>`::
+ Specific internal header to use within the library. This header
+ defines `BT_LOG_OUTPUT_LEVEL` to a custom, library-wide hidden
+ symbol which is the library's current log level before including
+ `<babeltrace/logging-internal.h>`.
+
+Do not include `<babeltrace/logging-internal.h>` or
+`<babeltrace/lib-logging-internal.h>` in a header which contains logging
+statements: this header could be included in source files which define a
+different <<choose-a-tag,tag>>, for example. See
+<<logging-instrument-header, Instrument a C header file>>.
+
+
+==== Log levels
+
+The API offers the following log levels:
+
+* _VERBOSE_
+* _DEBUG_
+* _INFO_
+* _WARN_
+* _ERROR_
+* _FATAL_
+
+See <<log-level,how to decide which one to use>> below.
+
+There are two important log level variables:
+
+[[build-time-log-level]]Build-time, minimal log level::
+ The minimal log level, or build-time log level, is set at build
+ time and determines the minimal log level which can be executed.
+ This applies to all the subprojects and modules (CLI, library,
+ plugins, etc.).
++
+All the logging statements with a level below this level are **not built
+at all**. All the logging statements with a level equal to or greater
+than this level _can_ be executed, depending on the
+<<run-time-log-level,run-time log level>>.
++
+You can set this level at configuration time with the
+`BABELTRACE_MINIMAL_LOG_LEVEL` environment variable, for example:
++
+--
+----
+$ BABELTRACE_MINIMAL_LOG_LEVEL=WARN ./configure
+----
+--
++
+The default build-time log level is `VERBOSE`. For optimal performance,
+set it to `NONE`, which effectively disables all logging in all the
+Babeltrace subprojects.
++
+The library's public API provides `bt_logging_get_minimal_level()` to
+get the configured minimal log level.
+
+[[run-time-log-level]]Run-time, dynamic log level::
+ The dynamic log level is set at run-time and determines the current,
+ active log level. All the logging statements with a level below this
+ level are not executed, but they evaluate the condition. All the
+ logging statements with a level equal to or greater than this level
+ are executed, provided that their level is also
+ <<build-time-log-level,enabled at build time>>.
++
+`zf_log` has a concept of a global run-time log level which uses the
+`_bt_log_global_output_lvl` symbol. In practice, we never use this
+symbol, and always make sure that `BT_LOG_OUTPUT_LEVEL` is defined to a
+module-wise or subproject-wise hidden symbol before including
+`<babeltrace/logging-internal.h>`. In the library,
+`<babeltrace/lib-logging-internal.h>` does this job: just include this
+header which defines `BT_LOG_OUTPUT_LEVEL` to the appropriate symbol
+before it includes `<babeltrace/logging-internal.h>`. In plugins, for
+example, there is one log level per component class, which makes log
+filtering easier during execution.
++
+In libbabeltrace, the user can set the current run-time log level with
+the `bt_logging_set_global_level()` function, for example:
++
+--
+[source,c]
+----
+bt_logging_set_global_level(BT_LOGGING_LEVEL_INFO);
+----
+--
++
+The library's initial run-time log level is defined by the
+`BABELTRACE_LOGGING_GLOBAL_LEVEL` environment variable (`VERBOSE`, `DEBUG`,
+`INFO`, `WARN`, `ERROR`, `FATAL`, or `NONE`), or set to _NONE_ if this
+environment variable is undefined.
++
+Other subprojects have their own way of setting their run-time log
+level. For example, the CLI uses the `BABELTRACE_CLI_LOG_LEVEL`
+environment variable, and the `filter.utils.muxer` component class
+initializes its log level thanks to the
+`BABELTRACE_PLUGIN_UTILS_MUXER_FLT_LOG_LEVEL` environment variable
+(also _NONE_ by default).
++
+Make sure that there is a documented way to initialize or modify the
+log level of your subproject or module, and that it's set to _NONE_
+by default.
+
+
+[[logging-statements]]
+==== Logging statement macros
+
+The Babeltrace logging statement macros work just like `printf()` and
+contain their log level in their name:
+
+`BT_LOGV("format string", ...)`::
+ Standard verbose logging statement.
+
+`BT_LOGD("format string", ...)`::
+ Standard debug logging statement.
+
+`BT_LOGI("format string", ...)`::
+ Standard info logging statement.
+
+`BT_LOGW("format string", ...)`::
+ Standard warning logging statement.
+
+`BT_LOGE("format string", ...)`::
+ Standard error logging statement.
+
+`BT_LOGF("format string", ...)`::
+ Standard fatal logging statement.
+
+`BT_LOGV_MEM(data_ptr, data_size, "format string", ...)`::
+ Memory verbose logging statement.
+
+`BT_LOGD_MEM(data_ptr, data_size, "format string", ...)`::
+ Memory debug logging statement.
+
+`BT_LOGI_MEM(data_ptr, data_size, "format string", ...)`::
+ Memory info logging statement.
+
+`BT_LOGW_MEM(data_ptr, data_size, "format string", ...)`::
+ Memory warning logging statement.
+
+`BT_LOGE_MEM(data_ptr, data_size, "format string", ...)`::
+ Memory error logging statement.
+
+`BT_LOGF_MEM(data_ptr, data_size, "format string", ...)`::
+ Memory fatal logging statement.
+
+`BT_LOGV_STR("preformatted string")`::
+ Preformatted string verbose logging statement.
+
+`BT_LOGD_STR("preformatted string")`::
+ Preformatted string debug logging statement.
+
+`BT_LOGI_STR("preformatted string")`::
+ Preformatted string info logging statement.
+
+`BT_LOGW_STR("preformatted string")`::
+ Preformatted string warning logging statement.
+
+`BT_LOGE_STR("preformatted string")`::
+ Preformatted string error logging statement.
+
+`BT_LOGF_STR("preformatted string")`::
+ Preformatted string fatal logging statement.
+
+
+==== Conditional logging
+
+`BT_LOG_IF(cond, statement)`::
+ Execute `statement` only if `cond` is true.
++
+Example:
++
+--
+[source,c]
+----
+BT_LOG_IF(i < count / 2, BT_LOGD("Log this: i=%d", i));
+----
+--
+
+To check the <<build-time-log-level,build-time log level>>:
+
+[source,c]
+----
+#if BT_LOG_ENABLED_DEBUG
+...
+#endif
+----
+
+This tests if the _DEBUG_ level was enabled at build-time. This means
+that the current, <<run-time-log-level,dynamic log level>> _could_ be
+_DEBUG_, but it could also be higher. The rule of thumb is to use only
+logging statements at the same level in a `BT_LOG_ENABLED_*` conditional
+block.
+
+The available definitions for build-time conditions are:
+
+* `BT_LOG_ENABLED_VERBOSE`
+* `BT_LOG_ENABLED_DEBUG`
+* `BT_LOG_ENABLED_INFO`
+* `BT_LOG_ENABLED_WARN`
+* `BT_LOG_ENABLED_ERROR`
+* `BT_LOG_ENABLED_FATAL`
+
+To check the current, <<run-time-log-level,run-time log level>>:
+
+[source,c]
+----
+if (BT_LOG_ON_DEBUG) {
+ ...
+}
+----
+
+This tests if the _DEBUG_ log level is dynamically turned on
+(implies that it's also enabled at build-time). This check could have a
+noticeable impact on performance.
+
+The available definitions for run-time conditions are:
+
+* `BT_LOG_ON_VERBOSE`
+* `BT_LOG_ON_DEBUG`
+* `BT_LOG_ON_INFO`
+* `BT_LOG_ON_WARN`
+* `BT_LOG_ON_ERROR`
+* `BT_LOG_ON_FATAL`
+
+Those macros check the subproject-specific or module-specific log level
+symbol (defined by `BT_LOG_OUTPUT_LEVEL`).
+
+Never, ever write code which would be executed only to compute the
+fields of a logging statement outside a conditional logging scope,
+for example:
+
+[source,c]
+----
+int number = get_number_of_event_classes_with_property_x(...);
+BT_LOGD("Bla bla: number=%d", number);
+----
+
+Do this instead:
+
+[source,c]
+----
+if (BT_LOG_ON_DEBUG) {
+ int number = get_number_of_event_classes_with_property_x(...);
+ BT_LOGD("Bla bla: number=%d", number);
+}
+----
+
+Or even this:
+
+[source,c]
+----
+BT_LOGD("Bla bla: number=%d", get_number_of_event_classes_with_property_x(...));
+----
+
+
+[[how-to]]
+=== Instrument a module
+
+Follow those steps to make your module loggable:
+
+. In your module's root directory, create a `logging.c` file with
+ this content:
++
+--
+[source,c]
+----
+/*
+ * Copyright (c) 2017 EfficiOS Inc. <http://efficios.com/>
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+ * SOFTWARE.
+ */
+
+#define BT_LOG_OUTPUT_LEVEL my_module_log_level
+#include <babeltrace/logging-internal.h>
+
+BT_LOG_INIT_LOG_LEVEL(my_module_log_level, "BABELTRACE_MY_MODULE_LOG_LEVEL");
+----
+--
++
+Replace `my_module_log_level` with the name of the symbol which holds
+the log level for your module (should be unique amongst all the log level
+symbols of the project). Replace `BABELTRACE_MY_MODULE_LOG_LEVEL` with
+the name of the environment variable from which to initialize your
+module's log level at construction time. `BT_LOG_INIT_LOG_LEVEL()`
+defines both the hidden log level symbol and a constructor which reads
+the environment variable and sets the log level symbol accordingly.
+
+. In your module's root directory, create a `logging.h` file with
+ this content:
++
+--
+[source,c]
+----
+#ifndef MY_MODULE_LOGGING_H
+#define MY_MODULE_LOGGING_H
+
+/*
+ * Copyright (c) 2017 EfficiOS Inc. <http://efficios.com/>
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+ * SOFTWARE.
+ */
+
+#define BT_LOG_OUTPUT_LEVEL my_module_log_level
+#include <babeltrace/logging-internal.h>
+
+BT_LOG_LEVEL_EXTERN_SYMBOL(my_module_log_level);
+
+#endif /* MY_MODULE_LOGGING_H */
+----
+--
++
+Replace `my_module_log_level` with the name of your module's
+log level symbol.
+
+. Include the `logging.c` and `logging.h` in the `_SOURCES` variable
+ of your module's object in your module's root `Makefile.am`.
+
+
+[[logging-instrument-source]]
+==== Instrument a C source file
+
+To instrument a C source file (`.c`):
+
+. At the top of the file, before the first `#include` line (if any),
+ define your file's tag name and include the local `logging.h`:
++
+--
+[source,c]
+----
+#define BT_LOG_TAG "MY-MODULE-MY-FILE"
+#include "logging.h"
+----
+--
++
+A logging tag name is a namespace for a specific source file. Its name
+is part of every log message generated by the statements of the file. A
+logging tag name _must_ be only uppercase letters, digits, and the
+hyphen (`-`) character. See <<choose-a-tag,Choose a tag>> for
+a list of standard tags.
+
+. Use the <<logging-statements,logging statement macros>> in the file's
+ functions to instrument it.
+
+
+[[logging-instrument-header]]
+==== Instrument a C header file
+
+To instrument a C header file (`.h`), if you have `static inline`
+functions in it:
+
+. Do not include any logging header.
+. Use the <<logging-statements,logging statement macros>> in the file's
+ functions to instrument it, making each of them conditional to the
+ existence of the macro you're using:
++
+--
+[source,c]
+----
+static inline
+void some_function(void)
+{
+ /* ... */
+
+#ifdef BT_LOGV
+ BT_LOGV(...);
+#endif
+
+ /* ... */
+
+#ifdef BT_LOGW_STR
+ BT_LOGW_STR(...);
+#endif
+
+ /* ... */
+}
+----
+--
++
+The C source files which include this header file determine if logging
+is enabled or not for them (if the source file is instrumented itself),
+and the tag of the included header's logging statement is the same as
+the including C source file.
+
+
+[[choose-a-tag]]
+=== Choose a tag
+
+For plugins, the format of the tag name for a given source file _must_
+be:
+
+[verse]
+PLUGIN-__PNAME__-__CCNAME__-__CCTYPE__[-__FILE__]
+
+__PNAME__::
+ Plugin's name.
+
+__CCNAME__::
+ Component class's name.
+
+__CCTYPE__::
+ Component class's type (`SRC`, `FLT`, or `SINK`).
+
+__FILE__::
+ Additional information to specify the source file name or module.
+
+Examples:
+
+* `PLUGIN-CTF-LTTNG-LIVE-SRC`
+* `PLUGIN-CTF-LTTNG-LIVE-SRC-VIEWER`
+* `PLUGIN-UTILS-MUXER-FLT`
+
+
+[[log-level]]
+=== Choose a log level
+
+Choosing the appropriate level for your logging statement is very
+important.
+
+[options="header,autowidth",cols="default,default,asciidoc,default"]
+|===
+|Log level |Description |Use cases |Impact on performance
+
+|_FATAL_
+|The program, library, or plugin cannot continue to work in this
+condition: it must be terminated immediately.
+
+A _FATAL_-level logging statement should always be followed by
+`abort()`.
+|
+* Unexpected return values from system calls.
+* Logic error in internal code, for example an unexpected value in a
+ `switch` statement.
+|Almost none: should be executed in production.
+
+|_ERROR_
+|An important error which is somewhat not fatal, that is, the program,
+library, or plugin can continue to work after this, but you judge that
+it should be reported to the user.
+
+Usually, the program cannot recover from such an error, but it can at
+least exit cleanly.
+|
+* Memory allocation errors.
+* Failed to perform an operation which should work considering the
+ implementation and the satisfied preconditions. For example, the
+ failure to create an empty object (no parameters): most probably
+ failed internally because of an allocation error.
+* Almost any error in terminal elements: CLI and plugins.
+|Almost none: should be executed in production.
+
+|_WARN_
+|A logic error which still allows the execution to continue.
+
+_WARN_-level logging statements are for any error or weird action that
+is directly or indirectly caused by the user. For example, not having
+enough memory is considered beyond the user's control, so we always
+log memory errors with an _ERROR_ level (not _FATAL_ because we usually
+don't abort in this condition).
+
+Almost all the library's errors are logged as warnings because they are
+caused by the user.
+|
+* Not honoring a public function's preconditions (NULL parameters,
+ index out of bounds, etc.).
+* Adding an invalid event class to a stream class which is already
+ part of a trace.
++
+For example, the caller tries to set a property of a frozen stream
+class.
+|Almost none: can be executed in production.
+
+|_INFO_
+|Any useful information which a non-developer user would understand.
+|
+* Successful loading of a plugin (with name, version, etc.).
+* Successful connection to or disconnection from another system.
+* An _optional_ subsystem cannot be loaded.
+|Very little: can be executed in production if
+_INFO_ level information is desired.
+
+|_DEBUG_
+|Something that only Babeltrace developers would be interested into.
+|
+* High-level function entry/exit.
+* Object creation, destruction, copying, and freezing.
+* The result of some computation/validation which does not
+ occur in a tight loop.
+|Noticeable, but not as much as the _VERBOSE_ level: not executed in
+production.
+
+|_VERBOSE_
+|Low-level debugging context information. More appropriate for tracing
+in general.
+|
+* Reference count change.
+* Status of each iteration of a loop.
+* State machine's state change.
+* Data structure lookup/modification.
+* List of ELF sections found in a plugin.
+* Get or set an object's property.
+* Object comparison's intermediate results.
+|Huge: not executed in production.
+|===
+
+Make sure not to use a _WARN_ (or higher) log level when the condition
+leading to the logging statement can occur under normal circumstances.
+For example, a public function to get some object or property from an
+object by name or key that fails to find the value is not a warning: the
+user could legitimately use this function to check if the name/key
+exists in the object. In this case, use the _VERBOSE_ level (or do not
+log at all). If a numeric index is out of bounds, however, this
+qualifies for a _WARN_ level: such API functions have documented
+preconditions that the index must be in bounds (the user can always
+check with a count or size function).
+
+
+[[message]]
+=== Write an appropriate message
+
+Follow those rules when you write a logging statement's message:
+
+* Use an english sentence which starts with a capital letter. Start the
+ sentence with the appropriate verb tense depending on the context. For
+ example:
++
+--
+** Beginning of operation (present continuous): _Creating ..._,
+ _Copying ..._, _Serializing ..._, _Freezing ..._, _Destroying ..._
+** End of operation (simple past): _Created ..._, _Successfully created ..._,
+ _Failed to create ..._, _Set ..._ (simple past of _to set_ which is
+ also _set_)
+--
++
+For warning and error messages, you can start the message with _Cannot_
+or _Failed to_ followed by a verb if it's appropriate.
+
+* Do not include the log level in the message itself. For example,
+ do not start the message with _Error while_ or _Warning:_.
+
+* Do not put newlines, tabs, or other special characters in the
+ message, unless you want to log a string with such characters. Note
+ that multiline log messages can be hard to parse, analyze, and filter,
+ however, so prefer multiple `BT_LOG*()` statements over a single
+ statement with newlines.
+
+* **If there are fields that your logging statement must record**,
+ follow the message with `:` followed by a space, then with the list of
+ fields (more about this below). If there are no fields, end the
+ sentence with a period.
+
+The statement's fields _must_ be a comma-separated list of
++__name__=__value__+ tokens. Keep +__name__+ as simple as possible
+(lowercase if possible). If +__value__+ is a non-alphanumeric string,
+put it between double quotes. Always use the `PRId64` and `PRIu64`
+specifiers when logging `int64_t` and `uint64_t` values.
+
+Example:
+
+ "Cannot add event class to stream class: stream-class-addr=%p, "
+ "stream-class-name=\"%s\", stream-class-id=%" PRId64 ", "
+ "event-class-addr=%p, event-class-name=\"%s\", event-class-id=%" PRId64
+
+By following a standard format for the statement fields, it is easier
+to use tools like https://www.elastic.co/products/logstash[Logstash]
+to split fields and analyze logs.
+
+Prefer the following suffixes in field names:
+
+[options="header,autowidth"]
+|===
+|Field name suffix |Description |Format specifier
+
+|`-addr` |Memory address |`%p`
+|`-fd` |File descriptor |`%d`
+|`-fp` |File stream (`FILE *`) |`%p`
+|`-id` |Object's ID |`%" PRId64 "` or `%" PRIu64 "`
+|`-name` |Object's name |`\"%s\"`
+|===
+
+
+=== Output
+
+The log is printed to the standard error stream. A log line contains the
+time, the process and thread IDs, the <<log-level,log level>>, the
+<<choose-a-tag,tag>>, the source's function name, file name and
+line number, and the <<message,message>>.
+
+When Babeltrace supports terminal color codes (depends on the
+`BABELTRACE_TERM_COLOR` environment variable's value and what the
+standard output and error streams are plugged into), _INFO_-level lines
+are blue, _WARN_-level lines are yellow, and _ERROR_-level and
+_FATAL_-level lines are red.
+
+Log line example:
+
+ 05-11 00:58:03.691 23402 23402 D VALUES bt_value_destroy@values.c:498 Destroying value: addr=0xb9c3eb0
+
+You can easily filter the log with `grep` or `ag`. For example, to
+keep only the _WARN_-level log messages that the `VALUES` module
+generates:
+
+ $ export BABELTRACE_LOGGING_GLOBAL_LEVEL=VERBOSE
+ $ ./test_ctf_writer_complete 2>&1 | ag 'W VALUES'
extras
dist_doc_DATA = ChangeLog LICENSE mit-license.txt gpl-2.0.txt \
- std-ext-lib.txt README
+ std-ext-lib.txt README CONTRIBUTING.adoc
dist_noinst_DATA = CodingStyle
pkgconfigdir = $(libdir)/pkgconfig
pkgconfig_DATA = babeltrace.pc babeltrace-ctf.pc
+
+CONTRIBUTING.html: $(srcdir)/CONTRIBUTING.adoc
+ asciidoc --verbose -a source-highlighter=pygments $<
+
+CLEANFILES = CONTRIBUTING.html
doc/api/Doxyfile
doc/bindings/Makefile
doc/bindings/python/Makefile
- doc/images/Makefile
+ doc/contributing-images/Makefile
lib/Makefile
lib/prio_heap/Makefile
lib/plugin/Makefile
-SUBDIRS = bindings images
+SUBDIRS = bindings contributing-images
if ENABLE_API_DOC
SUBDIRS += api
dist_man_MANS = babeltrace.1 babeltrace-log.1
-EXTRA_DIST = development.txt logging-guide.adoc ref-counting.md API.txt lttng-live.txt
-
-logging-guide.html: logging-guide.adoc
- asciidoc --verbose -a source-highlighter=pygments logging-guide.adoc
-
-CLEANFILES = logging-guide.html
+EXTRA_DIST = API.txt lttng-live.txt
--- /dev/null
+EXTRA_DIST = bt-ref01.png bt-ref02.png bt-ref03.png bt-ref04.png \
+ bt-ref05.png bt-ref06.png bt-ref07.png bt-ref08.png \
+ bt-ref09.png bt-ref10.png bt-ref11.png bt-ref12.png \
+ bt-ref13.png
+++ /dev/null
-This document describes some principles that should be respected when
-developing in Babeltrace.
-
-Memory usage :
-
-Since Babeltrace exports a library, we need to make sure that all allocated
-memory is freed, we do not want any memory leaks.
-Since Babeltrace uses the glib, it is necessary to assist a little valgrind
-when trying to identify memory leaks.
-
-libpopt has issues with inconsistency between versions. Namely, libpopt
-0.16 allocates memory for the string returned by poptgetArg(), but not
-libpopt 0.13. Therefore, we are providing a warning suppression file
-that covers this case in the extras/ directory of the source code.
-
-So the proper invocation of Babeltrace with Valgrind is :
-
-G_SLICE=always-malloc G_DEBUG=gc-friendly \
- valgrind --leak-check=full \
- --suppressions=path_to_babeltrace_src/extras/valgrind/popt.supp \
- babeltrace
+++ /dev/null
-EXTRA_DIST = bt-ref01.svg bt-ref02.svg bt-ref03.svg bt-ref04.svg \
- bt-ref05.svg bt-ref06.svg bt-ref07.svg bt-ref08.svg \
- bt-ref09.svg bt-ref10.svg bt-ref11.svg bt-ref12.svg \
- bt-ref13.svg
+++ /dev/null
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+++ /dev/null
-= Babeltrace logging guide
-Philippe Proulx
-31 May 2017
-:toc:
-:toclevels: 5
-
-This guide explains to the Babeltrace developer how to insert logging
-statements in Babeltrace's CLI, library, and plugins.
-
-
-== Motive
-
-Logging is a great instrument for a developer to be able to collect
-information about a running software.
-
-Babeltrace is a complex software with many layers. When a Babeltrace
-graph fails to run, what caused the failure? It could be caused by any
-component, any notification iterator, and any deeply nested validation
-of a CTR IR object, for example. With the appropriate logging statements
-manually placed in the source code, we can find the cause of a bug
-faster.
-
-While <<level,care must be taken>> when placing _INFO_ to _FATAL_
-logging statements, you should deliberately instrument your Babeltrace
-module with _DEBUG_ and _VERBOSE_ logging statements to help future
-you and other developers understand what's happening at run-time.
-
-
-== API
-
-The Babeltrace logging API is internal: it is not exposed to the users
-of the library, only to their developers. The only thing that a library
-user can control is the current log level of the library itself with
-`bt_logging_set_global_level()` and the initial library's log level with
-the `BABELTRACE_LOGGING_GLOBAL_LEVEL` environment variable.
-
-This API is based on https://github.com/wonder-mice/zf_log[zf_log], a
-lightweight, yet featureful, MIT-licensed core logging library for C and
-$$C++$$. The zf_log source files were modified to have the `BT_` and
-`bt_` prefixes, and other small changes.
-
-The logging functions are implemented in the logging convenience
-library (`logging` directory).
-
-
-=== Headers
-
-The logging API headers are:
-
-`<babeltrace/logging.h>`::
- Public header which a library user can use to control and read
- libbabeltrace's current log level.
-
-`<babeltrace/logging-internal.h>`::
- Internal, generic logging API which you can use in any Babeltrace
- subproject. This is the translation of `zf_log.h`.
-
-`<babeltrace/lib-logging-internal.h>`::
- Specific internal header to use within the library. This header
- defines `BT_LOG_OUTPUT_LEVEL` to a custom, library-wide hidden
- symbol which is the library's current log level before including
- `<babeltrace/logging-internal.h>`.
-
-Do not include `<babeltrace/logging-internal.h>` or
-`<babeltrace/lib-logging-internal.h>` in a header which contains logging
-statements: this header could be included in source files which define a
-different <<tag,tag>>, for example.
-
-
-
-=== Log levels ===
-
-The API offers the following log levels:
-
-* _VERBOSE_
-* _DEBUG_
-* _INFO_
-* _WARN_
-* _ERROR_
-* _FATAL_
-
-See <<level,how to decide which one to use>> below.
-
-There are two important log level variables:
-
-[[build-time-log-level]]Build-time, minimal log level::
- The minimal log level, or build-time log level, is set at build
- time and determines the minimal log level which can be executed.
- This applies to all the subprojects and modules (CLI, library,
- plugins, etc.).
-+
-All the logging statements with a level below this level are **not built
-at all**. All the logging statements with a level equal to or greater
-than this level _can_ be executed, depending on the run-time log level
-(see below).
-+
-You can set this level at configuration time with the
-`BABELTRACE_MINIMAL_LOG_LEVEL` environment variable, for example:
-+
---
-----
-$ BABELTRACE_MINIMAL_LOG_LEVEL=WARN ./configure
-----
---
-+
-The default build-time log level is `DEBUG`. For optimal performance,
-set it to `NONE`, which effectively disables all logging in all the
-Babeltrace subprojects.
-+
-The library's public API provides `bt_logging_get_minimal_level()` to
-get the configured minimal log level.
-
-[[run-time-log-level]]Run-time, dynamic log level::
- The dynamic log level is set at run-time and determines the current,
- active log level. All the logging statements with a level below this
- level are not executed, but they evaluate the condition. All the
- logging statements with a level equal to or greater than this level
- are executed, provided that their level is also enabled at build
- time (see above).
-+
-In `zf_log`, there is a concept of a global run-time log level which
-uses the `_bt_log_global_output_lvl` symbol. In practice, we never use
-this symbol, and always make sure that `BT_LOG_OUTPUT_LEVEL` is defined
-to a module-wise or subproject-wise hidden symbol before including
-`<babeltrace/logging-internal.h>`. In the library,
-`<babeltrace/lib-logging-internal.h>` does this job: just include
-this header which defines `BT_LOG_OUTPUT_LEVEL` to the appropriate
-symbol before it includes `<babeltrace/logging-internal.h>`. In plugins,
-for example, there is one log level per component class, which makes
-log filtering easier during execution.
-+
-In libbabeltrace, the user can set the current run-time log level with
-the `bt_logging_set_global_level()` function, for example:
-+
---
-[source,c]
-----
-bt_logging_set_global_level(BT_LOGGING_LEVEL_INFO);
-----
---
-+
-The library's initial run-time log level is defined by the
-`BABELTRACE_LOGGING_GLOBAL_LEVEL` environment variable (`VERBOSE`, `DEBUG`,
-`INFO`, `WARN`, `ERROR`, `FATAL`, or `NONE`), or set to _NONE_ if this
-environment variable is undefined.
-+
-Other subprojects have their own way of setting their run-time log
-level. For example, the CLI uses the `BABELTRACE_CLI_LOG_LEVEL`
-environment variable, and the `text.pretty` sink component class
-initializes its log level thanks to the
-`BABELTRACE_PLUGIN_TEXT_PRETTY_SINK_LOG_LEVEL` environment variable
-(also _NONE_ by default).
-+
-Make sure that there is a documented way to initialize or modify the
-log level of your subproject or module, and that it's set to _NONE_
-by default.
-
-
-[[logging-statements]]
-=== Logging statement macros
-
-The Babeltrace logging statement macros work just like `printf()` and
-contain their log level in their name:
-
-`BT_LOGV("format string", ...)`::
- Standard verbose logging statement.
-
-`BT_LOGD("format string", ...)`::
- Standard debug logging statement.
-
-`BT_LOGI("format string", ...)`::
- Standard info logging statement.
-
-`BT_LOGW("format string", ...)`::
- Standard warning logging statement.
-
-`BT_LOGE("format string", ...)`::
- Standard error logging statement.
-
-`BT_LOGF("format string", ...)`::
- Standard fatal logging statement.
-
-`BT_LOGV_MEM(data_ptr, data_size, "format string", ...)`::
- Memory verbose logging statement.
-
-`BT_LOGD_MEM(data_ptr, data_size, "format string", ...)`::
- Memory debug logging statement.
-
-`BT_LOGI_MEM(data_ptr, data_size, "format string", ...)`::
- Memory info logging statement.
-
-`BT_LOGW_MEM(data_ptr, data_size, "format string", ...)`::
- Memory warning logging statement.
-
-`BT_LOGE_MEM(data_ptr, data_size, "format string", ...)`::
- Memory error logging statement.
-
-`BT_LOGF_MEM(data_ptr, data_size, "format string", ...)`::
- Memory fatal logging statement.
-
-`BT_LOGV_STR("preformatted string")`::
- Preformatted string verbose logging statement.
-
-`BT_LOGD_STR("preformatted string")`::
- Preformatted string debug logging statement.
-
-`BT_LOGI_STR("preformatted string")`::
- Preformatted string info logging statement.
-
-`BT_LOGW_STR("preformatted string")`::
- Preformatted string warning logging statement.
-
-`BT_LOGE_STR("preformatted string")`::
- Preformatted string error logging statement.
-
-`BT_LOGF_STR("preformatted string")`::
- Preformatted string fatal logging statement.
-
-
-=== Conditional logging
-
-`BT_LOG_IF(cond, statement)`::
- Execute `statement` only if `cond` is true.
-+
-Example:
-+
---
-[source,c]
-----
-BT_LOG_IF(i < count / 2, BT_LOGD("Log this: i=%d", i));
-----
---
-
-To check the <<build-time-log-level,build-time log level>>:
-
-[source,c]
-----
-#if BT_LOG_ENABLED_DEBUG
-...
-#endif
-----
-
-This tests if the _DEBUG_ level was enabled at build-time. This
-means that the current, dynamic log level _could_ be _DEBUG_, but it
-could also be higher. The rule of thumb is to use only logging
-statements at the same level in a `BT_LOG_ENABLED_*` conditional block.
-
-The available definitions for build-time conditions are:
-
-* `BT_LOG_ENABLED_VERBOSE`
-* `BT_LOG_ENABLED_DEBUG`
-* `BT_LOG_ENABLED_INFO`
-* `BT_LOG_ENABLED_WARN`
-* `BT_LOG_ENABLED_ERROR`
-* `BT_LOG_ENABLED_FATAL`
-
-To check the current, <<run-time-log-level,run-time log level>>:
-
-[source,c]
-----
-if (BT_LOG_ON_DEBUG) {
- ...
-}
-----
-
-This tests if the _DEBUG_ log level is dynamically turned on
-(implies that it's also enabled at build-time). This check could have a
-noticeable impact on performance.
-
-The available definitions for run-time conditions are:
-
-* `BT_LOG_ON_VERBOSE`
-* `BT_LOG_ON_DEBUG`
-* `BT_LOG_ON_INFO`
-* `BT_LOG_ON_WARN`
-* `BT_LOG_ON_ERROR`
-* `BT_LOG_ON_FATAL`
-
-Those macros check the subproject-specific or module-specific log level
-symbol (defined by `BT_LOG_OUTPUT_LEVEL`).
-
-Never, ever write code which would be executed only to compute the
-fields of a logging statement outside a conditional logging scope,
-for example:
-
-[source,c]
-----
-int number = get_number_of_event_classes_with_property_x(...);
-BT_LOGD("Bla bla: number=%d", number);
-----
-
-Do this instead:
-
-[source,c]
-----
-if (BT_LOG_ON_DEBUG) {
- int number = get_number_of_event_classes_with_property_x(...);
- BT_LOGD("Bla bla: number=%d", number);
-}
-----
-
-Or even this:
-
-[source,c]
-----
-BT_LOGD("Bla bla: number=%d", get_number_of_event_classes_with_property_x(...));
-----
-
-
-[[how-to]]
-=== Instrument a module
-
-Follow those steps to make your module loggable:
-
-. In your module's root directory, create a `logging.c` file with
- this content:
-+
---
-[source,c]
-----
-/*
- * Copyright (c) 2017 EfficiOS Inc. <http://efficios.com/>
- *
- * Permission is hereby granted, free of charge, to any person obtaining a copy
- * of this software and associated documentation files (the "Software"), to deal
- * in the Software without restriction, including without limitation the rights
- * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
- * copies of the Software, and to permit persons to whom the Software is
- * furnished to do so, subject to the following conditions:
- *
- * The above copyright notice and this permission notice shall be included in
- * all copies or substantial portions of the Software.
- *
- * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
- * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
- * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
- * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
- * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
- * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
- * SOFTWARE.
- */
-
-#define BT_LOG_OUTPUT_LEVEL my_module_log_level
-#include <babeltrace/logging-internal.h>
-
-BT_LOG_INIT_LOG_LEVEL(my_module_log_level, "BABELTRACE_MY_MODULE_LOG_LEVEL");
-----
---
-+
-Replace `my_module_log_level` with the name of the symbol which holds
-the log level for your module (should be unique amongst all the log level
-symbols of the project). Replace `BABELTRACE_MY_MODULE_LOG_LEVEL` with
-the name of the environment variable from which to initialize your
-module's log level at construction time. `BT_LOG_INIT_LOG_LEVEL()`
-defines both the hidden log level symbol and a constructor which reads
-the environment variable and sets the log level symbol accordingly.
-
-. In your module's root directory, create a `logging.h` file with
- this content:
-+
---
-[source,c]
-----
-#ifndef MY_MODULE_LOGGING_H
-#define MY_MODULE_LOGGING_H
-
-/*
- * Copyright (c) 2017 EfficiOS Inc. <http://efficios.com/>
- *
- * Permission is hereby granted, free of charge, to any person obtaining a copy
- * of this software and associated documentation files (the "Software"), to deal
- * in the Software without restriction, including without limitation the rights
- * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
- * copies of the Software, and to permit persons to whom the Software is
- * furnished to do so, subject to the following conditions:
- *
- * The above copyright notice and this permission notice shall be included in
- * all copies or substantial portions of the Software.
- *
- * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
- * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
- * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
- * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
- * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
- * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
- * SOFTWARE.
- */
-
-#define BT_LOG_OUTPUT_LEVEL my_module_log_level
-#include <babeltrace/logging-internal.h>
-
-BT_LOG_LEVEL_EXTERN_SYMBOL(my_module_log_level);
-
-#endif /* MY_MODULE_LOGGING_H */
-----
---
-+
-Again, replace `my_module_log_level` with the name of your module's
-log level symbol.
-
-. Include the `logging.c` and `logging.h` in the `_SOURCES` variable
- of your module's object in your module's root `Makefile.am`.
-
-To instrument a C source file (`.c`):
-
-. At the top of the file, before the first `#include` line (if any),
- define your file's tag name and include the local `logging.h`:
-+
---
-[source,c]
-----
-#define BT_LOG_TAG "MY-MODULE-MY-FILE"
-#include "logging.h"
-----
---
-+
-A logging tag name is a namespace for a specific source file. Its name
-is part of every log message generated by the statements of the file. A
-logging tag name _must_ be only uppercase letters, digits, and the
-hyphen (`-`) character. See <<tags,Choose a tag>> for
-a list of standard tags.
-
-. Use the <<logging-statements,logging statement macros>> in the file's
- functions to instrument it.
-
-To instrument a C header file (`.h`), if you have `static inline`
-functions in it:
-
-. Do not include any logging header.
-. Use the <<logging-statements,logging statement macros>> in the file's
- functions to instrument it, making each of them conditional to the
- existence of the macro you're using:
-+
---
-[source,c]
-----
-static inline
-void some_function(void)
-{
- /* ... */
-
-#ifdef BT_LOGV
- BT_LOGV(...);
-#endif
-
- /* ... */
-
-#ifdef BT_LOGW_STR
- BT_LOGW_STR(...);
-#endif
-
- /* ... */
-}
-----
---
-+
-The C source files which include this header file determine if logging
-is enabled or not for them (if the source file is instrumented itself),
-and the tag of the included header's logging statement is the same as
-the C source file.
-
-
-[[tags]]
-=== Choose a tag
-
-For plugins, the format of the tag name for a given source file _must_
-be:
-
-[verse]
-PLUGIN-__PNAME__-__CCNAME__-__CCTYPE__[-__FILE__]
-
-__PNAME__::
- Plugin's name.
-
-__CCNAME__::
- Component class's name.
-
-__CCTYPE__::
- Component class's type (`SRC`, `FLT`, or `SINK`).
-
-__FILE__::
- Additional information to specify the source file name or module.
-
-Examples:
-
-* `PLUGIN-CTF-LTTNG-LIVE-SRC`
-* `PLUGIN-CTF-LTTNG-LIVE-SRC-VIEWER`
-* `PLUGIN-UTILS-MUXER-FLT`
-
-
-[[level]]
-== Choose a log level
-
-Choosing the appropriate level for your logging statement is very
-important.
-
-[options="header,autowidth",cols="default,default,asciidoc,default"]
-|===
-|Log level |Description |Use cases |Impact on performance
-
-|_FATAL_
-|The program, library, or plugin cannot continue to work in this
-condition: it must be terminated immediately.
-
-A _FATAL_-level logging statement should always be followed by
-`abort()`.
-|
-* Unexpected return values from system calls.
-* Logic error in internal code, for example an unexpected value in a
- `switch` statement.
-|Almost none: should be executed in production.
-
-|_ERROR_
-|An important error which is somewhat not fatal, that is, the program,
-library, or plugin can continue to work after this, but you judge that
-it should be reported to the user.
-
-Usually, the program cannot recover from such an error, but it can at
-least exit cleanly.
-|
-* Memory allocation errors.
-* Failed to perform an operation which should work considering the
- implementation and the satisfied preconditions. For example, the
- failure to create an empty object (no parameters): most probably
- failed internally because of an allocation error.
-* Almost any error in terminal elements: CLI and plugins.
-|Almost none: should be executed in production.
-
-|_WARN_
-|A logic error which still allows the execution to continue.
-
-_WARN_-level logging statements are for any error or weird action that
-is directly or indirectly caused by the user. For example, not having
-enough memory is considered beyond the user's control, so we always
-log memory errors with an _ERROR_ level (not _FATAL_ because we usually
-don't abort in this condition).
-
-Almost all the library's errors are logged as warnings because they are
-caused by the user.
-|
-* Not honoring a public function's preconditions (NULL parameters,
- index out of bounds, etc.).
-* Adding an invalid event class to a stream class which is already
- part of a trace.
-+
-For example, the caller tries to set a property of a frozen stream
-class.
-|Almost none: can be executed in production.
-
-|_INFO_
-|Any useful information which a non-developer user would understand.
-|
-* Successful loading of a plugin (with name, version, etc.).
-* Successful connection to or disconnection from another system.
-* An _optional_ subsystem cannot be loaded.
-|Very little: can be executed in production if
-_INFO_ level information is desired.
-
-|_DEBUG_
-|Something that only Babeltrace developers would be interested into.
-|
-* High-level function entry/exit.
-* Object creation, destruction, copying, and freezing.
-* The result of some computation/validation.
-|Noticeable, but not as much as the _VERBOSE_ level: not executed in
-production.
-
-|_VERBOSE_
-|Low-level debugging context information. More appropriate for tracing
-in general.
-|
-* Reference count change.
-* Status of each iteration of a loop.
-* State machine's state change.
-* Data structure lookup/modification.
-* List of ELF sections found in a plugin.
-* Get or set an object's property.
-* Object comparison's intermediate results.
-|Huge: not executed in production.
-|===
-
-Make sure not to use a _WARN_ (or higher) log level when the condition
-leading to the logging statement can occur under normal circumstances.
-For example, a public function to get some object or property from an
-object by name or key that fails to find the value is not a warning: the
-user could legitimately use this function to check if the name/key
-exists in the object. In this case, use the _VERBOSE_ level (or do not
-log at all). If a numeric index is out of bounds, however, this
-qualifies for a _WARN_ level: such API functions have documented
-preconditions that the index must be in bounds (the user can always
-check with a count or size function).
-
-
-[[message]]
-== Write an appropriate message
-
-Follow those rules when you write a logging statement's message:
-
-* Use an english sentence which starts with a capital letter. Start the
- sentence with the appropriate verb tense depending on the context. For
- example:
-+
---
-** Beginning of operation (present continuous): _Creating ..._,
- _Copying ..._, _Serializing ..._, _Freezing ..._, _Destroying ..._
-** End of operation (simple past): _Created ..._, _Successfully created ..._,
- _Failed to create ..._, _Set ..._ (simple past of _to set_ which is
- also _set_)
---
-+
-For warning and error messages, you can start the message with _Cannot_
-or _Failed to_ followed by a verb if it's appropriate.
-
-* Do not include the log level in the message itself. For example,
- do not start the message with _Error while_ or _Warning:_.
-
-* Do not put newlines, tabs, or other special characters in the
- message, unless you want to log a string with such characters. Note
- that multiline log messages can be hard to parse, analyze, and filter,
- however, so prefer multiple `BT_LOG*()` statements over a single
- statement with newlines.
-
-* **If there are fields that your logging statement must record**,
- follow the message with `:` followed by a space, then with the list of
- fields (more about this below). If there are no fields, end the
- sentence with a period.
-
-The statement's fields _must_ be a comma-separated list of
-+__name__=__value__+ tokens. Keep +__name__+ as simple as possible
-(lowercase if possible). If +__value__+ is a non-alphanumeric string,
-put it between double quotes. Always use the `PRId64` and `PRIu64`
-specifiers when logging `int64_t` and `uint64_t` values.
-
-Example:
-
- "Cannot add event class to stream class: stream-class-addr=%p, "
- "stream-class-name=\"%s\", stream-class-id=%" PRId64 ", "
- "event-class-addr=%p, event-class-name=\"%s\", event-class-id=%" PRId64
-
-By following a standard format for the statement fields, it is easier
-to use tools like https://www.elastic.co/products/logstash[Logstash]
-to split fields and analyze logs.
-
-Prefer the following suffixes in field names:
-
-[options="header,autowidth"]
-|===
-|Field name suffix |Description |Format specifier
-
-|`-addr` |Memory address |`%p`
-|`-fd` |File descriptor |`%d`
-|`-fp` |File stream (`FILE *`) |`%p`
-|`-id` |Object's ID |`%" PRId64 "` or `%" PRIu64 "`
-|`-name` |Object's name |`\"%s\"`
-|===
-
-
-== Output
-
-The log is printed to the standard error stream. A log line contains the
-time, the process and thread IDs, the <<level,log level>>, the tag name,
-the source's function name, file name and line number, and the
-<<message,message>>.
-
-Example:
-
- 05-11 00:58:03.691 23402 23402 D VALUES bt_value_destroy@values.c:498 Destroying value: addr=0xb9c3eb0
-
-You can easily filter the log with `grep` or `ag`. For example, to
-keep only the _WARN_-level log messages that the `VALUES` module
-generates:
-
- $ export BABELTRACE_LOGGING_GLOBAL_LEVEL=VERBOSE
- $ ./test_ctf_writer_complete 2>&1 | ag 'W VALUES'
+++ /dev/null
-# Babeltrace Object Reference Counting and Lifetime
-
-This document covers the rationale behind the design of Babeltrace's object
-lifetime management.
-
-Starting from Babeltrace 2.x, all publicly exposed objects inherit a common
-base: bt_object. This base provides a number of facilities to all objects, chief
-amongst which are lifetime management functions.
-
-The reference count of all public objects is controlled by invoking
-the `bt_get()` and `bt_put()` functions which respectively
-increment and decrement an object's reference count.
-
-As far as lifetime management in concerned, Babeltrace makes a clear
-distinction between regular objects, which have a single parent, and root
-objects, which don't.
-
-## The Problem
-
-Let us consider a problematic case to illustrate the need for this
-distinction.
-
-A user of the CTF Writer library declares a Trace, which *has* a
-Stream Class (the declaration of a stream) and that Stream Class, in
-turn, *has* an Event Class (the declaration of an event).
-
-Nothing prevents this user from releasing his reference on any one of
-these objects in any order. However, all objects in the "Trace <->
-Stream <-> Event" hierarchy can be retrieved from any other.
-
-For instance, the user could discard his reference on both the Event
-Class and the Stream Class, only keeping a reference on the Trace.
-From this Trace reference, Stream Classes can be enumerated, providing
-the user with a new reference to the Stream Class he discarded
-earlier. Event Classes can also be enumerated from Stream Classes,
-providing the user with references to the individual Event Classes.
-
-Conversely, the user could also hold a reference to an Event Class and
-retrieve its parent Stream Class. The Trace, in turn, can then be
-retrieved from the Stream Class.
-
-This example illustrates what could be interpreted as a circular
-reference dependency existing between these objects. Of course, if the
-objects in such a scenario were to hold references to each other (in
-both directions), we would be in presence of a circular ownership
-resulting in a leak of both objects as their reference counts would
-never reach zero.
-
-Nonetheless, the API must offer the guarantee that holding a node to any node of
-the graph keeps all other reachable nodes alive.
-
-## The Solution
-
-The scheme employed in Babeltrace to break this cycle consists in the
-"children" holding *Reverse Component References* to their parents. That
-is, in the context of CTF-IR, that Event Classes hold a reference to
-their Stream Class and Stream Classes hold a reference to their Trace.
-
-On the other hand, parents hold *Claiming Aggregation References* to
-their children. A claiming aggregation reference means that the
-object being referenced should not be deleted as long as the reference
-still exists. In this respect, it can be said that parents truly hold the
-ownership of their children, since they control their lifetime. Conversely,
-the reference counting mechanism is leveraged by children to notify parents
-that no other child indirectly exposes the parent.
-
-When a parented object's reference count reaches zero, it invokes
-`bt_put()` on its parent and does **not** free itself. However, from that
-point, the object depends on its parent to signal the moment when it
-can be safely reclaimed.
-
-The invocation of `bt_put()` by the last children holding a reference to its
-parent might trigger a cascade of `bt_put()` from child to parent. Eventually,
-a **root** object is reached. At that point, if this orphaned object's
-reference count reaches zero, the object will invoke the `destroy()` method
-defined by every one of its children as part of their base `struct bt_object`.
-The key point here is that the cascade of `destroy()` will necessarily originate
-from the root and propagate in pre-order to the children. These children will
-propagate the destruction to their own children before reclaiming their own
-memory. This ensures that a node's pointer to its parent is *always* valid
-since the parent has the responsibility of tearing-down their children before
-cleaning themselves-up.
-
-Assuming a reference to an object is *acquired* by calling `bt_get()` while its
-reference count is zero, the object will, in turn, acquire a reference on its
-parent using `bt_get()`. At that point, the child can be thought of as having
-converted its weak reference to its parent into a regular reference. That is
-why this reference is referred to as a *claiming* aggregation reference.
-
-## Caveats
-
-This scheme imposes a number of strict rules defining the relation
-between objects:
-
- * Objects may only have one parent,
- * Objects, beside the root, are only retrievable from their direct parent or
- children.
-
-## Walking through an example
-
-The initial situation is rather simple. **User A** is holding a reference to a
-trace, **TC1**. As per the rules previously enounced, Stream Classes **SC1** and
-**SC2** don't hold a reference to **TC1** since their own reference counts are
-zero. The same holds true for **EC1**, **EC2** and **EC3** with respect to
-**SC1** and **SC2**.
-
-
-
-In this second step, we can see that User A has acquired a reference on **SC2**
-through the Trace, **TC1**.
-
-The Stream Class' reference count transitions from zero to one, triggering the
-acquisition of a strong reference on **TC1** from **SC2**.
-
-Hence, at this point, the Trace's ownership is shared by **User A** and
-**SC2**.
-
-
-
-Next, **User A** acquires a reference on the **EC3** Event Class through its
-parent Stream Class, **SC2**. Again, the transition of an object's reference
-count from 0 to 1 triggers the acquisition of a reference on its parent.
-
-Note that SC2's reference count was incremented to 2. The Trace's reference
-count remains unchanged.
-
-
-
-**User A** decides to drop its reference on **SC2**. **SC2**'s reference count
-returns back to 1, everything else remaining unchanged.
-
-
-
-**User A** can then decide to drop its reference on the Trace. This results in
-a reversal of the initial situation: **User A** now owns an event, **EC3**,
-which is keeping everything else alive and reachable.
-
-
-
-If another object, **User B**, enters the picture and acquires a reference on
-the **SC1** Stream Class, we see that **SC1**'s reference count
-transitioned from 0 to 1, triggering the acquisition of a reference on **TC1**.
-
-
-
-**User B** hands off a reference to **EC1**, acquired through **SC1**, to
-another object, **User C**. The acquisition of a reference on **EC1**, which
-transitions from 0 to 1, triggers the acquisition of a reference on its parent,
-**SC1**.
-
-
-
-At some point, **User A** releases its reference on **EC3**. Since **EC3**'s
-reference count transitions to zero, it releases its reference on **SC2**.
-**SC2**'s reference count, in turn, reaches zero and it releases its reference
-to **TC1**.
-
-**TC1**'s reference count is now 1 and no further action is taken.
-
-
-
-**User B** releases its reference on **SC1**. **User C** becomes the sole owner
-of the whole hierarchy through his ownership of **EC1**.
-
-
-
-Finally, **User C** releases his ownership of **EC1**, triggering the release of
-the whole hierarchy. We will walk through the reclamation of the whole graph.
-
-Mirroring what happened when **User A** released its last reference on **EC3**,
-the release of **EC1** by **User C** causes its reference count to fall to zero.
-
-This transition to zero causes **EC1** to release its reference on **SC1**.
-**SC1**'s reference count reaching zero causes it to release its reference on
-**TC1**.
-
-
-
-Since the reference count of **TC1**, a root object, has reached zero, it
-invokes the `destroy()` method on its children. This method is recursive and
-causes the Stream Classes to call the `destroy()` method on their Event Classes.
-
-The Event Classes are reached and, having no children of their own, are
-reclaimed.
-
-
-
-The Stream Classes having destroyed their children, are then reclaimed by the
-Trace.
-
-
-
-Finally, the Stream Classes having been reclaimed, **TC1** is reclaimed.
-
-
projects / babeltrace.git / commitdiff
