[all-commits] [llvm/llvm-project] d38b5b: [lit] Add __slots__ to hot shell-execution objects...

[Prasoon via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: d38b5b3b990d8f8e3782ed0ea7e0499dd168d9e6
      https://github.com/llvm/llvm-project/commit/d38b5b3b990d8f8e3782ed0ea7e0499dd168d9e6
  Author: Prasoon <prasoonkumar054 at gmail.com>
  Date:   2026-05-29 (Fri, 29 May 2026)

  Changed paths:
    M llvm/utils/lit/lit/ShellEnvironment.py
    M llvm/utils/lit/lit/builtin_commands/diff.py

  Log Message:
  -----------
  [lit] Add __slots__ to hot shell-execution objects (#199668)

`ShellCommand`, `ShellEnvironment` and `DiffFlags` classes are
instantiated per commad / per diff. `__slots__` drops the per-instance
`__dict__`, lowering memory and speeding attribute access. (`__slots__` 
not `@dataclass(slots=True)` to keep Python 3.8 support.)

**Baseline:**
| Stage | Metric (Runtime / Peak RSS) |
| :--- | :--- |
| **CodeGen-X86** | 99.310s / 51872 kB |
| **llvm-transforms** | 51.457s / 66928 kB |

**Changes made here:**
| Stage | Metric (Runtime / Peak RSS) |
| :--- | :--- |
| **CodeGen-X86** | 98.708s / 51872 kB |
| **llvm-transforms** | 51.496s / 66824 kB |

This PR is part of the "GSoC 2026: Improving lit" project.

Signed-off-by: Prasoon Kumar <prasoonkumar054 at gmail.com>



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