syncmeta

Sync Meta Crates

Sync recent changes from hotpath → hotpath-meta and hotpath-macros → hotpath-macros-meta.

The meta crates are copies of the main crates used to profile the profiler itself. They must stay in sync with the source crates.

Effective Approach

DO NOT copy entire files from hotpath to hotpath-meta and then sed-replace. This approach fails because the meta crates have many naming differences beyond simple hotpath:: → hotpath_meta:: substitution:

• Feature flags: hotpath → hotpath-meta, hotpath-alloc → hotpath-alloc-meta
• Crate imports: hotpath_macros → hotpath_macros_meta
• Environment variables: HOTPATH_FOCUS → HOTPATH_META_FOCUS, HOTPATH_EXCLUDE_WRAPPER → HOTPATH_META_EXCLUDE_WRAPPER, HOTPATH_OUTPUT_PATH → HOTPATH_META_OUTPUT_PATH
• Self-instrumentation: lines like #[cfg_attr(feature = "hotpath-meta", hotpath_meta::measure_all)] exist in hotpath but must NOT exist in hotpath-meta

Instead, apply diffs to the existing meta files:

1. Get the actual diff for each changed file: git diff HEAD~N..HEAD -- crates/hotpath/src/path/to/file.rs
2. Read the corresponding meta file
3. Apply the equivalent semantic changes, preserving all meta-specific naming

Steps

1. Check the last N commits (default 1, user can specify more) for changes to crates/hotpath/ and crates/hotpath-macros/:

git log --oneline -N
git diff HEAD~N..HEAD --name-only -- crates/hotpath/src/ crates/hotpath-macros/src/

1. For each changed file, get the hotpath diff:

git diff HEAD~N..HEAD -- crates/hotpath/src/path/to/file.rs

1. Read the corresponding meta file and apply the equivalent changes using Edit tool. The meta files are at:

   • crates/hotpath/src/** → crates/hotpath-meta/src/**
   • crates/hotpath-macros/src/** → crates/hotpath-macros-meta/src/**

2. Verify the meta crates compile:

cargo check -p hotpath-meta --features hotpath-meta
cargo check -p hotpath-macros-meta --features hotpath-meta
cargo check -p hotpath-meta --features hotpath-meta,hotpath-alloc-meta