third_party.pigweed.src/pw_bloat/docs.rst

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.. default-domain:: cpp
.. highlight:: sh
pw_toolchain_size_report template This change adds a GN template which creates a size report card across a set of different toolchains. The toolchains are defined in a build variable, each with an optional linker script and Bloaty config. The size report template builds a base and diff executable with each of the toolchains and compares the size difference of each. Example output for the host target: simple_bloat_toolchain ────────────────────── ┌───────────┬─────────┬────────┬───────┬───────┐ │ Label │ Segment │ Before │ Delta │ After │ ├═══════════┼═════════┼════════┼═══════┼═══════┤ │ gcc -Og │ CODE │ 413 │ +32 │ 445 │ │ │ RAM │ 576 │ +8 │ 584 │ ├───────────┼─────────┼────────┼───────┼───────┤ │ gcc -Os │ CODE │ 429 │ +16 │ 445 │ │ │ RAM │ 576 │ +8 │ 584 │ ├───────────┼─────────┼────────┼───────┼───────┤ │ gcc -O2 │ CODE │ 429 │ +32 │ 461 │ │ │ RAM │ 576 │ +8 │ 584 │ ├───────────┼─────────┼────────┼───────┼───────┤ │ clang -Og │ CODE │ 448 │ +32 │ 480 │ │ │ RAM │ 113 │ +15 │ 128 │ ├───────────┼─────────┼────────┼───────┼───────┤ │ clang -Os │ CODE │ 432 │ +16 │ 448 │ │ │ RAM │ 113 │ +15 │ 128 │ ├───────────┼─────────┼────────┼───────┼───────┤ │ clang -O2 │ CODE │ 448 │ +80 │ 528 │ │ │ RAM │ 113 │ +15 │ 128 │ └───────────┴─────────┴────────┴───────┴───────┘ Change-Id: I2c65f4d4f61354b9779628f207297eacd04470b9
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.. _chapter-bloat:
--------
pw_bloat
--------
The bloat module provides tools to generate size report cards for output
binaries.
pw_toolchain_size_report template This change adds a GN template which creates a size report card across a set of different toolchains. The toolchains are defined in a build variable, each with an optional linker script and Bloaty config. The size report template builds a base and diff executable with each of the toolchains and compares the size difference of each. Example output for the host target: simple_bloat_toolchain ────────────────────── ┌───────────┬─────────┬────────┬───────┬───────┐ │ Label │ Segment │ Before │ Delta │ After │ ├═══════════┼═════════┼════════┼═══════┼═══════┤ │ gcc -Og │ CODE │ 413 │ +32 │ 445 │ │ │ RAM │ 576 │ +8 │ 584 │ ├───────────┼─────────┼────────┼───────┼───────┤ │ gcc -Os │ CODE │ 429 │ +16 │ 445 │ │ │ RAM │ 576 │ +8 │ 584 │ ├───────────┼─────────┼────────┼───────┼───────┤ │ gcc -O2 │ CODE │ 429 │ +32 │ 461 │ │ │ RAM │ 576 │ +8 │ 584 │ ├───────────┼─────────┼────────┼───────┼───────┤ │ clang -Og │ CODE │ 448 │ +32 │ 480 │ │ │ RAM │ 113 │ +15 │ 128 │ ├───────────┼─────────┼────────┼───────┼───────┤ │ clang -Os │ CODE │ 432 │ +16 │ 448 │ │ │ RAM │ 113 │ +15 │ 128 │ ├───────────┼─────────┼────────┼───────┼───────┤ │ clang -O2 │ CODE │ 448 │ +80 │ 528 │ │ │ RAM │ 113 │ +15 │ 128 │ └───────────┴─────────┴────────┴───────┴───────┘ Change-Id: I2c65f4d4f61354b9779628f207297eacd04470b9
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.. _bloat-howto:
Defining size reports
=====================
.. TODO(frolv): Explain how bloat works and how to set it up.
Documentation integration
=========================
Bloat reports are easy to add to documentation files. All ``pw_size_report``
targets output a ``.rst`` file containing a tabular report card. This file
can be imported directly into a documentation file using the ``include``
directive.
pw_toolchain_size_report template This change adds a GN template which creates a size report card across a set of different toolchains. The toolchains are defined in a build variable, each with an optional linker script and Bloaty config. The size report template builds a base and diff executable with each of the toolchains and compares the size difference of each. Example output for the host target: simple_bloat_toolchain ────────────────────── ┌───────────┬─────────┬────────┬───────┬───────┐ │ Label │ Segment │ Before │ Delta │ After │ ├═══════════┼═════════┼════════┼═══════┼═══════┤ │ gcc -Og │ CODE │ 413 │ +32 │ 445 │ │ │ RAM │ 576 │ +8 │ 584 │ ├───────────┼─────────┼────────┼───────┼───────┤ │ gcc -Os │ CODE │ 429 │ +16 │ 445 │ │ │ RAM │ 576 │ +8 │ 584 │ ├───────────┼─────────┼────────┼───────┼───────┤ │ gcc -O2 │ CODE │ 429 │ +32 │ 461 │ │ │ RAM │ 576 │ +8 │ 584 │ ├───────────┼─────────┼────────┼───────┼───────┤ │ clang -Og │ CODE │ 448 │ +32 │ 480 │ │ │ RAM │ 113 │ +15 │ 128 │ ├───────────┼─────────┼────────┼───────┼───────┤ │ clang -Os │ CODE │ 432 │ +16 │ 448 │ │ │ RAM │ 113 │ +15 │ 128 │ ├───────────┼─────────┼────────┼───────┼───────┤ │ clang -O2 │ CODE │ 448 │ +80 │ 528 │ │ │ RAM │ 113 │ +15 │ 128 │ └───────────┴─────────┴────────┴───────┴───────┘ Change-Id: I2c65f4d4f61354b9779628f207297eacd04470b9
2019-12-19 00:13:38 +00:00
For example, the ``simple_bloat_loop`` and ``simple_bloat_function`` size
reports under ``//pw_bloat/examples`` are imported into this file as follows:
.. code:: rst
pw_toolchain_size_report template This change adds a GN template which creates a size report card across a set of different toolchains. The toolchains are defined in a build variable, each with an optional linker script and Bloaty config. The size report template builds a base and diff executable with each of the toolchains and compares the size difference of each. Example output for the host target: simple_bloat_toolchain ────────────────────── ┌───────────┬─────────┬────────┬───────┬───────┐ │ Label │ Segment │ Before │ Delta │ After │ ├═══════════┼═════════┼════════┼═══════┼═══════┤ │ gcc -Og │ CODE │ 413 │ +32 │ 445 │ │ │ RAM │ 576 │ +8 │ 584 │ ├───────────┼─────────┼────────┼───────┼───────┤ │ gcc -Os │ CODE │ 429 │ +16 │ 445 │ │ │ RAM │ 576 │ +8 │ 584 │ ├───────────┼─────────┼────────┼───────┼───────┤ │ gcc -O2 │ CODE │ 429 │ +32 │ 461 │ │ │ RAM │ 576 │ +8 │ 584 │ ├───────────┼─────────┼────────┼───────┼───────┤ │ clang -Og │ CODE │ 448 │ +32 │ 480 │ │ │ RAM │ 113 │ +15 │ 128 │ ├───────────┼─────────┼────────┼───────┼───────┤ │ clang -Os │ CODE │ 432 │ +16 │ 448 │ │ │ RAM │ 113 │ +15 │ 128 │ ├───────────┼─────────┼────────┼───────┼───────┤ │ clang -O2 │ CODE │ 448 │ +80 │ 528 │ │ │ RAM │ 113 │ +15 │ 128 │ └───────────┴─────────┴────────┴───────┴───────┘ Change-Id: I2c65f4d4f61354b9779628f207297eacd04470b9
2019-12-19 00:13:38 +00:00
Simple bloat loop example
^^^^^^^^^^^^^^^^^^^^^^^^^
.. include:: examples/simple_bloat_loop.rst
Simple bloat function example
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
.. include:: examples/simple_bloat_function.rst
Resulting in this output:
pw_toolchain_size_report template This change adds a GN template which creates a size report card across a set of different toolchains. The toolchains are defined in a build variable, each with an optional linker script and Bloaty config. The size report template builds a base and diff executable with each of the toolchains and compares the size difference of each. Example output for the host target: simple_bloat_toolchain ────────────────────── ┌───────────┬─────────┬────────┬───────┬───────┐ │ Label │ Segment │ Before │ Delta │ After │ ├═══════════┼═════════┼════════┼═══════┼═══════┤ │ gcc -Og │ CODE │ 413 │ +32 │ 445 │ │ │ RAM │ 576 │ +8 │ 584 │ ├───────────┼─────────┼────────┼───────┼───────┤ │ gcc -Os │ CODE │ 429 │ +16 │ 445 │ │ │ RAM │ 576 │ +8 │ 584 │ ├───────────┼─────────┼────────┼───────┼───────┤ │ gcc -O2 │ CODE │ 429 │ +32 │ 461 │ │ │ RAM │ 576 │ +8 │ 584 │ ├───────────┼─────────┼────────┼───────┼───────┤ │ clang -Og │ CODE │ 448 │ +32 │ 480 │ │ │ RAM │ 113 │ +15 │ 128 │ ├───────────┼─────────┼────────┼───────┼───────┤ │ clang -Os │ CODE │ 432 │ +16 │ 448 │ │ │ RAM │ 113 │ +15 │ 128 │ ├───────────┼─────────┼────────┼───────┼───────┤ │ clang -O2 │ CODE │ 448 │ +80 │ 528 │ │ │ RAM │ 113 │ +15 │ 128 │ └───────────┴─────────┴────────┴───────┴───────┘ Change-Id: I2c65f4d4f61354b9779628f207297eacd04470b9
2019-12-19 00:13:38 +00:00
Simple bloat loop example
^^^^^^^^^^^^^^^^^^^^^^^^^
.. include:: examples/simple_bloat_loop.rst
Simple bloat function example
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
.. include:: examples/simple_bloat_function.rst