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cpp11-migrate: Docs refresh
* Documented new command-line options. * Moved usage to a new page. * Usage now split into general options and transform-related options. * Main Migrator page now contains getting started and getting involved information. * Also included a JIRA issue collector button for logging bugs. llvm-svn: 183417
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Edwin Vane
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@ -25,6 +25,16 @@ For example:
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void h() const override;
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};
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Using Expands-to-Override Macros
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--------------------------------
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Like LLVM's ``LLVM_OVERRIDE``, several projects have macros that conditionally
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expand to the ``override`` keyword when compiling with C++11 features enabled.
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To maintain compatibility with non-C++11 builds, the Add-Override Transform
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supports detection and use of these macros instead of using the ``override``
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keyword directly. Specify ``-override-macros`` on the command line to the
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Migrator to enable this behavior.
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Known Limitations
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-----------------
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128
clang-tools-extra/docs/MigratorUsage.rst
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128
clang-tools-extra/docs/MigratorUsage.rst
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@ -0,0 +1,128 @@
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===================
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cpp11-migrate Usage
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===================
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``cpp11-migrate [options] <source0> [... <sourceN>] [-- [args]]``
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``<source#>`` specifies the path to the source to migrate. This path may be
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relative to the current directory.
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At least one transform must be enabled.
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General Command Line Options
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----------------------------
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.. option:: -help
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Displays tool usage instructions and command line options.
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.. option:: -version
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Displays the version information of this tool.
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.. option:: -p[=<build-path>]
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``<build-path>`` is the directory containing a file named
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``compile_commands.json`` which provides compiler arguments for building each
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source file. CMake can generate this file by specifying
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``-DCMAKE_EXPORT_COMPILE_COMMANDS`` when running CMake. Ninja_, since v1.2
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can also generate this file with ``ninja -t compdb``. If ``<build-path>`` is
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not provided the ``compile_commands.json`` file is searched for through all
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parent directories.
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.. option:: -- [args]
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Another way to provide compiler arguments is to specify all arguments on the
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command line following ``--``. Arguments provided this way are used for
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*every* source file.
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If ``-p`` is not specified, ``--`` is necessary, even if no compiler
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arguments are required.
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.. _Ninja: http://martine.github.io/ninja/
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.. option:: -risk=<risk-level>
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Some transformations may cause a change in semantics. In such cases the
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maximum acceptable risk level specified through the ``-risk`` command
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line option decides whether or not a transformation is applied.
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Three different risk level options are available:
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``-risk=safe``
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Perform only safe transformations.
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``-risk=reasonable`` (default)
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Enable transformations that may change semantics.
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``-risk=risky``
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Enable transformations that are likely to change semantics.
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The meaning of risk is handled differently for each transform. See
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:ref:`transform documentation <transforms>` for details.
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.. option:: -final-syntax-check
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After applying the final transform to a file, parse the file to ensure the
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last transform did not introduce syntax errors. Syntax errors introduced by
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earlier transforms are already caught when subsequent transforms parse the
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file.
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.. option:: -summary
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Displays a summary of the number of changes each transform made or could have
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made to each source file immediately after each transform is applied.
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**Accepted** changes are those actually made. **Rejected** changes are those
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that could have been made if the acceptable risk level were higher.
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**Deferred** changes are those that might be possible but they might conflict
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with other accepted changes. Re-applying the transform will resolve deferred
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changes.
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.. option:: -perf[=<directory>]
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Turns on performance measurement and output functionality. The time it takes to
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apply each transform is recorded by the migrator and written in JSON format
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to a uniquely named file in the given ``<directory>``. All sources processed
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by a single Migrator process are written to the same output file. If ``<directory>`` is
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not provided the default is ``./migrate_perf/``.
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The time recorded for a transform includes parsing and creating source code
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replacements.
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Transform-Specific Command Line Options
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---------------------------------------
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.. option:: -loop-convert
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Makes use of C++11 range-based for loops where possible. See
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:doc:`LoopConvertTransform`.
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.. option:: -use-nullptr
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Makes use of the new C++11 keyword ``nullptr`` where possible.
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See :doc:`UseNullptrTransform`.
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.. option:: -user-null-macros=<string>
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``<string>`` is a comma-separated list of user-defined macros that behave like
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the ``NULL`` macro. The :option:`-use-nullptr` transform will replace these
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macros along with ``NULL``. See :doc:`UseNullptrTransform`.
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.. option:: -use-auto
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Replace the type specifier of variable declarations with the ``auto`` type
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specifier. See :doc:`UseAutoTransform`.
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.. option:: -add-override
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Adds the override specifier to member functions where it is appropriate. That
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is, the override specifier is added to member functions that override a
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virtual function in a base class and that don't already have the specifier.
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See :doc:`AddOverrideTransform`.
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.. option:: -override-macros
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Tells the Add Override Transform to locate a macro that expands to
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``override`` and use that macro instead of the ``override`` keyword directly.
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If no such macro is found, ``override`` is still used. This option enables
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projects that use such macros to maintain build compatibility with non-C++11
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code.
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@ -1,8 +1,8 @@
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.. index:: cpp11-migrate
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===========================
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cpp11-migrate User's Manual
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===========================
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============================
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C++11 Migrator User's Manual
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============================
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.. toctree::
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:hidden:
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@ -11,107 +11,105 @@ cpp11-migrate User's Manual
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UseNullptrTransform
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LoopConvertTransform
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AddOverrideTransform
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MigratorUsage
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:program:`cpp11-migrate` is a standalone tool used to automatically convert
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C++98 and C++03 code to use features of the new C++11 standard where
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appropriate.
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Basic Usage
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===========
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Getting Started
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---------------
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``cpp11-migrate [options] <source0> [... <sourceN>]``
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To build from source:
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``<source0>...`` specify the paths of files in the CMake source tree,
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with the same requirements as other tools built on LibTooling.
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1. Read `Getting Started with the LLVM System`_ and `Clang Tools
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Documentation`_ for information on getting sources for LLVM, Clang, and
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Clang Extra Tools.
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Command Line Options
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--------------------
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2. `Getting Started with the LLVM System`_ and `Building LLVM with CMake`_ give
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directions for how to build. With sources all checked out into the
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right place the LLVM build will build Clang Extra Tools and their
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dependencies automatically.
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.. option:: -help
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* If using CMake, you can also use the ``cpp11-migrate`` target to build
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just the Migrator and its dependencies.
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Displays tool usage instructions and command line options.
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Before continuing, take a look at :doc:`MigratorUsage` to see how to invoke the
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Migrator.
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.. option:: -loop-convert
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Before running the Migrator on code you'll need the arguments you'd normally
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pass to the compiler. If you're migrating a single file with few compiler
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arguments, it might be easier to pass the compiler args on the command line
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after ``--``. If you're working with multiple files or even a single file
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with many compiler args, it's probably best to use a *compilation database*.
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Makes use of C++11 range-based for loops where possible. See
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:doc:`LoopConvertTransform`.
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A `compilation database`_ contains the command-line arguments for multiple
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files. If the code you want to transform can be built with CMake, you can
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generate this database easily by running CMake with the
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``-DCMAKE_EXPORT_COMPILE_COMMANDS`` option. The Ninja_ build system, since
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v1.2, can create this file too using the *compdb* tool: ``ninja -t compdb``. If
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you're not already using either of these tools or cannot easily make use of
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them you might consider looking into Bear_.
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.. option:: -use-nullptr
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In addition to the compiler arguments you usually build your code with, you must
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provide the option for enabling C++11 features. For clang and versions of gcc
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≥ v4.8 this is ``-std=c++11``.
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Makes use of the new C++11 keyword ``nullptr`` where possible.
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See :doc:`UseNullptrTransform`.
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.. option:: -user-null-macros=<string>
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``<string>`` is a comma-separated list of user-defined macros that behave like
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the ``NULL`` macro. The :option:`-use-nullptr` transform will replace these
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macros along with ``NULL``. See :doc:`UseNullptrTransform`.
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.. option:: -use-auto
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Replace the type specifier of variable declarations with the ``auto`` type
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specifier. See :doc:`UseAutoTransform`.
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.. option:: -add-override
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Adds the override specifier to member functions where it is appropriate. That
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is, the override specifier is added to member functions that override a
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virtual function in a base class and that don't already have the specifier.
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See :doc:`AddOverrideTransform`.
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.. option:: -p=<build-path>
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``<build-path>`` is a CMake build directory containing a file named
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``compile_commands.json`` which provides compiler options for building
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each source file and can be generated by specifying
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``-DCMAKE_EXPORT_COMPILE_COMMANDS`` when running CMake. If ``<build-path>``
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is not provided the ``compile_commands.json`` file is searched for through
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all parent directories.
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Alternatively, one can provide compile options to be applied to every
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source file after the optional ``--``.
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.. option:: -risk=<risk-level>
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Some transformations may cause a change in semantics. In such cases the
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maximum acceptable risk level specified through the ``-risk`` command
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line option decides whether or not a transformation is applied.
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Three different risk level options are available:
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``-risk=safe``
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Perform only safe transformations.
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``-risk=reasonable`` (default)
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Enable transformations that may change semantics.
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``-risk=risky``
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Enable transformations that are likely to change semantics.
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The meaning of risk is handled differently for each transform. See
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:ref:`transform documentation <transforms>` for details.
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.. option:: -final-syntax-check
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After applying the final transform to a file, parse the file to ensure the
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last transform did not introduce syntax errors. Syntax errors introduced by
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earlier transforms are already caught when subsequent transforms parse the
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file.
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.. option:: -fatal-assembler-warnings
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Treat all compiler warnings as errors.
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Now with compiler arguments, the Migrator can be applied to source. Sources are
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transformed in place and changes are only written to disk if compilation errors
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aren't caused by the transforms. Each transform will re-parse the output from
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the previous transform. The output from the last transform is not checked
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unless ``-final-syntax-check`` is enabled.
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.. option:: -version
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.. _Ninja: http://martine.github.io/ninja/
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.. _Bear: https://github.com/rizsotto/Bear
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.. _compilation database: http://clang.llvm.org/docs/JSONCompilationDatabase.html
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.. _Getting Started with the LLVM System: http://llvm.org/docs/GettingStarted.html
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.. _Building LLVM with CMake: http://llvm.org/docs/CMake.html
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.. _Clang Tools Documentation: http://clang.llvm.org/docs/ClangTools.html
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Displays the version information of this tool.
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Getting Involved
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----------------
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If you find a bug
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.. raw:: html
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<input type="button" id="logbug" value="Log a Bug!" />
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<script type="text/javascript" src="https://cpp11-migrate.atlassian.net/s/en_USpfg3b3-1988229788/6095/34/1.4.0-m2/_/download/batch/com.atlassian.jira.collector.plugin.jira-issue-collector-plugin:issuecollector/com.atlassian.jira.collector.plugin.jira-issue-collector-plugin:issuecollector.js?collectorId=50813874"></script>
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<script type="text/javascript">window.ATL_JQ_PAGE_PROPS = {
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"triggerFunction": function(showCollectorDialog) {
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//Requries that jQuery is available!
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jQuery("#logbug").click(function(e) {
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e.preventDefault();
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showCollectorDialog();
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});
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}};
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</script>
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Bugs and feature development of the Migrator are tracked at
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http://cpp11-migrate.atlassian.net. If you want to get involved the front page
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shows a list of outstanding issues or you can browse around the project to get
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familiar. To take on issues or contribute feature requests and/or bug reports
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you need to sign up for an account from the `log in page`_. An account also
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lets you sign up for notifications on issues or vote for unassigned issues to
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be completed.
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.. _log in page: https://cpp11-migrate.atlassian.net/login
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.. _transforms:
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Transformations
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===============
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---------------
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The Migrator is a collection of independent transforms which can be
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independently enabled. The transforms currently implemented are:
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* :doc:`LoopConvertTransform`
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* :doc:`UseNullptrTransform`
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* :doc:`UseAutoTransform`
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* :doc:`AddOverrideTransform`
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