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Fix some indenting and line-wrapping issues identified in ProgrammersManual. Make description of debugCounters a little clearer

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llvm-svn: 297656
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Daniel Berlin 2017-03-13 19:09:23 +00:00
parent ad5647725b
commit 58f8a88d1e
1 changed files with 28 additions and 26 deletions
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54
docs/ProgrammersManual.rst
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@ -1137,23 +1137,23 @@ uniform manner with the rest of the passes being executed.
There are many examples of ``Statistic`` uses, but the basics of using it are as
follows:
#. Define your statistic like this:
Define your statistic like this:
.. code-block:: c++
.. code-block:: c++
#define DEBUG_TYPE "mypassname" // This goes before any #includes.
STATISTIC(NumXForms, "The # of times I did stuff");
#define DEBUG_TYPE "mypassname" // This goes before any #includes.
STATISTIC(NumXForms, "The # of times I did stuff");
The ``STATISTIC`` macro defines a static variable, whose name is specified by
the first argument. The pass name is taken from the ``DEBUG_TYPE`` macro, and
the description is taken from the second argument. The variable defined
("NumXForms" in this case) acts like an unsigned integer.
The ``STATISTIC`` macro defines a static variable, whose name is specified by
the first argument. The pass name is taken from the ``DEBUG_TYPE`` macro, and
the description is taken from the second argument. The variable defined
("NumXForms" in this case) acts like an unsigned integer.
#. Whenever you make a transformation, bump the counter:
Whenever you make a transformation, bump the counter:
.. code-block:: c++
.. code-block:: c++
++NumXForms; // I did stuff!
++NumXForms; // I did stuff!
That's all you have to do. To get '``opt``' to print out the statistics
gathered, use the '``-stats``' option:
@ -1211,8 +1211,9 @@ is useful to be able to control whether certain things in your pass
happen or not. For example, there are times the minimization tooling
can only easily give you large testcases. You would like to narrow
your bug down to a specific transformation happening or not happening,
automatically. This is where debug counters help. They provide a framework
for making parts of your code only execute a certain number of times.
automatically, using bisection. This is where debug counters help.
They provide a framework for making parts of your code only execute a
certain number of times.
The ``llvm/Support/DebugCounter.h`` (`doxygen
<http://llvm.org/doxygen/DebugCounter_8h_source.html>`__) file
@ -1221,23 +1222,23 @@ command line counter options that control execution of parts of your code.
Define your DebugCounter like this:
.. code-block:: c++
.. code-block:: c++
DEBUG_COUNTER(DeleteAnInstruction, "passname-delete-instruction",
"Controls which instructions get delete").
DEBUG_COUNTER(DeleteAnInstruction, "passname-delete-instruction",
"Controls which instructions get delete").
The ``DEBUG_COUNTER`` macro defines a static variable, whose name
is specified by the first argument. The name of the counter
(which is used on the command line) is specified by the second
argument, and the description used in the help is specified by the
third argument.
The ``DEBUG_COUNTER`` macro defines a static variable, whose name
is specified by the first argument. The name of the counter
(which is used on the command line) is specified by the second
argument, and the description used in the help is specified by the
third argument.
Whatever code you want that control, use ``DebugCounter::shouldExecute`` to control it.
.. code-block:: c++
.. code-block:: c++
if (DebugCounter::shouldExecute(DeleteAnInstruction))
I->eraseFromParent();
if (DebugCounter::shouldExecute(DeleteAnInstruction))
I->eraseFromParent();
That's all you have to do. Now, using opt, you can control when this code triggers using
the '``--debug-counter``' option. There are two counters provided, ``skip`` and ``count``.
@ -1261,8 +1262,9 @@ So if executed on the following code:
It would delete number ``%2`` and ``%3``.
A utility is provided in `utils/bisect-skip-count` to binary search skip and count arguments. It can be used to automatically minimize
the skip and count for a debug-counter variable.
A utility is provided in `utils/bisect-skip-count` to binary search
skip and count arguments. It can be used to automatically minimize the
skip and count for a debug-counter variable.
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