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# llvm-hackme

A replacement for
[llvm-mutation-based-fuzz-service](https://github.com/dtcxzyw/llvm-mutation-based-fuzz-service).
It monitors open pull requests to
[llvm/llvm-project](https://github.com/llvm/llvm-project), performs
fuzzing on proposed middle-end patches, and reports bugs found (opt
crashes or Alive2 miscompilations) as PR review comments.

## Motivation

LLVM receives hundreds of middle-end patches each week. Reviewer
bandwidth is limited, and subtle correctness bugs often survive code
review.  This service automates the most tedious part of correctness
verification -- mutation-based fuzzing -- so that reviewers can focus
on high-level design decisions while the bot catches regressions
mechanically.

The service checks PRs that touch passes such as InstCombine,
InstSimplify, GVN, EarlyCSE, SCCP, Reassociate, SimplifyCFG,
ConstraintElimination, VectorCombine, AggressiveInstCombine,
CorrelatedValuePropagation, and PhaseOrdering, as well as shared
analysis infrastructure: KnownBits, KnownFPClass, ValueTracking,
ConstantFolding, and InstructionSimplify.

For deeper review of individual PRs, see
[Archer](https://github.com/cuhk-s3/Archer).

## Configuration

The following environment variables are **required**:

| Variable          | Description                       |
|-------------------|-----------------------------------|
| `GITHUB_TOKEN`    | GitHub API token (with repo read and PR write scopes) |
| `OPENAI_ENDPOINT` | OpenAI-compatible API base URL    |
| `OPENAI_AUTH_KEY` | API authentication key           |
| `OPENAI_MODEL`    | Model name for LLM patch review (e.g. `gpt-4o-mini`) |
| `LLVM_HACKME_HACK_MODEL` | opencode model for the hack agent in `provider/model` format (e.g. `deepseek/deepseek-v4-pro`) |

Optional variables (with defaults):

| Variable                                | Default                    |
|-----------------------------------------|----------------------------|
| `LLVM_HACKME_GITHUB_REPOSITORY`         | `llvm/llvm-project`        |
| `LLVM_HACKME_GITHUB_LOGIN`              | auto-detected from `/user` |
| `LLVM_HACKME_WORK_DIR`                  | `work/llvm-hackme`         |
| `LLVM_HACKME_STATE_DB`                  | `<work_dir>/state.db`      |
| `LLVM_HACKME_SCAN_INTERVAL_SECONDS`     | `60`                       |
| `LLVM_HACKME_SCAN_OVERLAP_SECONDS`     | `300`                      |
| `LLVM_HACKME_DEBOUNCE_SECONDS`          | `300`                      |
| `LLVM_HACKME_FUZZ_BUDGET_SECONDS`       | `600`                      |
| `LLVM_HACKME_HACK_BUDGET_SECONDS`      | `1200`                     |
| `LLVM_HACKME_MAX_FUZZ_PARALLELISM`      | `1`                        |
| `LLVM_HACKME_BASELINE_UPDATE_INTERVAL_SECONDS` | `3600`               |

## Quick Start

```bash
# 1. Set environment variables
export GITHUB_TOKEN=ghp_...
export OPENAI_ENDPOINT=https://api.openai.com/v1
export OPENAI_AUTH_KEY=sk-...
export OPENAI_MODEL=gpt-4o-mini

# 2. Install dependencies
uv sync

# 3. Run (TUI mode by default)
uv run python main.py

# Or headless mode
uv run python main.py --plain
```

The first run will clone `llvm/llvm-project` and `alive2`, then build the
LLVM toolchain (opt, llvm-extract, llvm-reduce, alive-tv, fuzz tools).
Subsequent runs only rebuild when the baseline moves forward.

## How It Works

1. **Scan** -- polls GitHub for open, non-draft PRs targeting `main`
   (excluding reverts).  Checks if the PR touches relevant middle-end
   files.
2. **LLM Review** -- a lightweight OpenAI call classifies each patch
   chunk as malicious or innocuous before any build or execution.
3. **Build** -- prepares a clean LLVM worktree at the PR head, builds
   `opt`, and assembles the full toolchain (baseline + PR opt,
   alive-tv, mutation tools).
4. **Fuzz** — when the patch touches test files, extracts seed functions from
    the changed `.ll` tests, mutates them, and runs the PR `opt` with the
    guessed pipeline.  Alive2 checks correctness.
5. **Hack** — if fuzzing finds nothing (or if the patch is source-only and
    fuzz is skipped), a lightweight LLM agent (openCode headless) analyzes the
    patch, reads the LLVM source, and attempts to construct a targeted test
    case.  Time budget
    is configurable via `LLVM_HACKME_HACK_BUDGET_SECONDS` (default 20 min).
 6. **Verify** -- each suspected bug is regression-tested against the
    baseline `opt` to confirm it is a new issue.
 7. **Report** -- posts a GitHub issue comment with the IR reproducer
    (crash stacktrace or Alive2 counterexample) and requests changes on
    the PR.

## Future Scope

- Expand coverage to additional LLVM middle-end passes and analyses.
- Tighten integration with the
  [llvm-autofix](https://github.com/dtcxzyw/llvm-autofix) pipeline so
  that confirmed bugs can be automatically narrowed down to a minimal
  test case and submitted to the LLVM issue tracker.

## License

Apache-2.0 -- see the [LICENSE](LICENSE) file.

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