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Modularise CI workflow and validate outputs for binary size checks
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# Github composite action to build a single-source-file test binary with an | ||
# already-checked-out version of Rust's stdlib, that will be patched with a | ||
# given revision of the backtrace crate. | ||
|
||
name: Build with patched std | ||
description: > | ||
Build a binary with a version of std that's had a specific revision of | ||
backtrace patched in. | ||
inputs: | ||
backtrace-commit: | ||
description: The git commit of backtrace to patch in to std | ||
required: true | ||
main-rs: | ||
description: The (single) source code file to compile | ||
required: true | ||
rustc-dir: | ||
description: The root directory of the rustc repo | ||
required: true | ||
outputs: | ||
test-binary-size: | ||
description: The size in bytes of the built test binary | ||
value: ${{ steps.measure.outputs.test-binary-size }} | ||
runs: | ||
using: composite | ||
steps: | ||
- shell: bash | ||
id: measure | ||
env: | ||
RUSTC_FLAGS: -Copt-level=3 -Cstrip=symbols | ||
# This symlink is made by Build::new() in the bootstrap crate, using a | ||
# symlink on Linux and a junction on Windows, so it will exist on both | ||
# platforms. | ||
RUSTC_BUILD_DIR: build/host | ||
working-directory: ${{ inputs.rustc-dir }} | ||
run: | | ||
rm -rf "$RUSTC_BUILD_DIR/stage0-std" | ||
(cd library/backtrace && git checkout ${{ inputs.backtrace-commit }}) | ||
git add library/backtrace | ||
python3 x.py build library --stage 0 | ||
TEMP_BUILD_OUTPUT=$(mktemp test-binary-XXXXXXXX) | ||
"$RUSTC_BUILD_DIR/stage0-sysroot/bin/rustc" $RUSTC_FLAGS "${{ inputs.main-rs }}" -o "$TEMP_BUILD_OUTPUT" | ||
BINARY_SIZE=$(stat -c '%s' "$TEMP_BUILD_OUTPUT") | ||
rm "$TEMP_BUILD_OUTPUT" | ||
echo "test-binary-size=$BINARY_SIZE" >> "$GITHUB_OUTPUT" |
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# Github composite action to report on code size changes across different | ||
# platforms. | ||
|
||
name: Report binary size changes on PR | ||
description: | | ||
Report on code size changes across different platforms resulting from a PR. | ||
The only input argument is the path to a directory containing a set of | ||
"*.json" files (extension required), each file containing the keys: | ||
- platform: the platform that the code size change was measured on | ||
- reference: the size in bytes of the reference binary (base of PR) | ||
- updated: the size in bytes of the updated binary (head of PR) | ||
The size is reported as a comment on the PR (accessed via context). | ||
inputs: | ||
data-directory: | ||
description: > | ||
Path to directory containing size data as a set of "*.json" files. | ||
required: true | ||
runs: | ||
using: composite | ||
steps: | ||
- name: Post a PR comment if the size has changed | ||
uses: actions/github-script@v6 | ||
env: | ||
DATA_DIRECTORY: ${{ inputs.data-directory }} | ||
with: | ||
script: | | ||
const fs = require("fs"); | ||
const size_dir = process.env.DATA_DIRECTORY; | ||
// Map the set of all the *.json files into an array of objects. | ||
const globber = await glob.create(`${size_dir}/*.json`); | ||
const files = await globber.glob(); | ||
const sizes = files.map(path => { | ||
const contents = fs.readFileSync(path); | ||
return JSON.parse(contents); | ||
}); | ||
// Map each object into some text, but only if it shows any difference | ||
// to report. | ||
const size_reports = sizes.flatMap(size_data => { | ||
const platform = size_data["platform"]; | ||
const reference = size_data["reference"]; | ||
const updated = size_data["updated"]; | ||
if (!(reference > 0)) { | ||
core.setFailed(`Reference size invalid: ${reference}`); | ||
return; | ||
} | ||
if (!(updated > 0)) { | ||
core.setFailed(`Updated size invalid: ${updated}`); | ||
return; | ||
} | ||
const formatter = Intl.NumberFormat("en", { | ||
useGrouping: "always" | ||
}); | ||
const updated_str = formatter.format(updated); | ||
const reference_str = formatter.format(reference); | ||
const diff = updated - reference; | ||
const diff_pct = (updated / reference) - 1; | ||
const diff_str = Intl.NumberFormat("en", { | ||
useGrouping: "always", | ||
sign: "exceptZero" | ||
}).format(diff); | ||
const diff_pct_str = Intl.NumberFormat("en", { | ||
style: "percent", | ||
useGrouping: "always", | ||
sign: "exceptZero", | ||
maximumFractionDigits: 2 | ||
}).format(diff_pct); | ||
if (diff !== 0) { | ||
// The body is created here and wrapped so "weirdly" to avoid whitespace at the start of the lines, | ||
// which is interpreted as a code block by Markdown. | ||
const report = `On platform \`${platform}\`: | ||
- Original binary size: **${reference_str} B** | ||
- Updated binary size: **${updated_str} B** | ||
- Difference: **${diff_str} B** (${diff_pct_str}) | ||
`; | ||
return [report]; | ||
} else { | ||
return []; | ||
} | ||
}); | ||
// If there are any size changes to report, format a comment and post | ||
// it. | ||
if (size_reports.length > 0) { | ||
const comment_sizes = size_reports.join(""); | ||
const body = `Code size changes for a hello-world Rust program linked with libstd with backtrace: | ||
${comment_sizes}`; | ||
github.rest.issues.createComment({ | ||
issue_number: context.issue.number, | ||
owner: context.repo.owner, | ||
repo: context.repo.repo, | ||
body | ||
}); | ||
} |
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