| commit | 16e74fd48988ac95551d0f64e1b36f78a82a89a2 | [log] [tgz] |
|---|---|---|
| author | Mingming Liu <mingmingl@google.com> | Tue Feb 27 11:07:40 2024 -0800 |
| committer | GitHub <noreply@github.com> | Tue Feb 27 11:07:40 2024 -0800 |
| tree | b03528cf7946694dacd26a844e5ef7078c5fc65d | |
| parent | 8e3b60540c81354b321018a47bf159ca9b52d776 [diff] |
Reland "[TypeProf][InstrPGO] Introduce raw and instr profile format change for type profiling." (#82711) New change on top of [reviewed patch](https://github.com/llvm/llvm-project/pull/81691) are [in commits after this one](https://github.com/llvm/llvm-project/pull/82711/commits/d0757f46b3e3865b5f7c552bc0744309a363e0ac). Previous commits are restored from the remote branch with timestamps. 1. Fix build breakage for non-ELF platforms, by defining the missing functions {`__llvm_profile_begin_vtables`, `__llvm_profile_end_vtables`, `__llvm_profile_begin_vtabnames `, `__llvm_profile_end_vtabnames`} everywhere. * Tested on mac laptop (for darwins) and Windows. Specifically, functions in `InstrProfilingPlatformWindows.c` returns `NULL` to make it more explicit that type prof isn't supported; see comments for the reason. * For the rest (AIX, other), mostly follow existing examples (like this [one](https://github.com/llvm/llvm-project/commit/f95b2f1acf1171abb0d00089fd4c9238753847e3)) 2. Rename `__llvm_prf_vtabnames` -> `__llvm_prf_vns` for shorter section name, and make returned pointers [const](https://github.com/llvm/llvm-project/pull/82711/commits/a825d2a4ec00f07772a373091a702f149c3b0c34#diff-4de780ce726d76b7abc9d3353aef95013e7b21e7bda01be8940cc6574fb0b5ffR120-R121) **Original Description** * Raw profile format - Header: records the byte size of compressed vtable names, and the number of profiled vtable entries (call it `VTableProfData`). Header also records padded bytes of each section. - Payload: adds a section for compressed vtable names, and a section to store `VTableProfData`. Both sections are padded so the size is a multiple of 8. * Indexed profile format - Header: records the byte offset of compressed vtable names. - Payload: adds a section to store compressed vtable names. This section is used by `llvm-profdata` to show the list of vtables profiled for an instrumented site. [The originally reviewed patch](https://github.com/llvm/llvm-project/pull/66825) will have profile reader/write change and llvm-profdata change. - To ensure this PR has all the necessary profile format change along with profile version bump, created a copy of the originally reviewed patch in https://github.com/llvm/llvm-project/pull/80761. The copy doesn't have profile format change, but it has the set of tests which covers type profile generation, profile read and profile merge. Tests pass there. rfc in https://discourse.llvm.org/t/rfc-dynamic-type-profiling-and-optimizations-in-llvm/74600 --------- Co-authored-by: modiking <modiking213@gmail.com>
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