rlx-runtime 0.2.1

// RLX — versatile ML compiler + runtime.
// Copyright (C) 2026 Eugene Hauptmann, Nataliya Kosmyna.
//
// This program is free software: you can redistribute it and/or modify
// it under the terms of the GNU General Public License as published by
// the Free Software Foundation, version 3.
//
// This program is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU General Public License for more details.
//
// You should have received a copy of the GNU General Public License
// along with this program. If not, see <https://www.gnu.org/licenses/>.

//! Compiled graph — the hot-path execution object.

use crate::backend::ExecutableGraph;
use rlx_driver::Device;

/// A compiled graph ready for execution.
///
/// Created by [`crate::Session::compile`]. Holds the fused + memory-planned
/// graph and all pre-allocated execution state. Call
/// [`CompiledGraph::run`] repeatedly with different inputs — zero
/// allocation per call.
pub struct CompiledGraph {
    inner: Box<dyn ExecutableGraph>,
    device: Device,
}

impl Clone for CompiledGraph {
    /// Deep-clones the underlying executable via `ExecutableGraph::clone_box`.
    /// Backends that don't support cloning will panic at this point.
    fn clone(&self) -> Self {
        Self {
            inner: self.inner.clone_box(),
            device: self.device,
        }
    }
}

impl CompiledGraph {
    pub(crate) fn new(inner: Box<dyn ExecutableGraph>, device: Device) -> Self {
        Self { inner, device }
    }

    /// Which device this graph runs on.
    pub fn device(&self) -> Device {
        self.device
    }

    /// Set a named parameter (model weight).
    /// Call once per parameter after compilation.
    pub fn set_param(&mut self, name: &str, data: &[f32]) {
        self.inner.set_param(name, data);
    }

    /// Execute the graph with named inputs.
    /// Returns one `Vec<f32>` per graph output (copies from arena).
    pub fn run(&mut self, inputs: &[(&str, &[f32])]) -> Vec<Vec<f32>> {
        self.inner.run(inputs)
    }

    /// Execute and return raw pointers to output data (zero-copy).
    /// Data is valid until the next `run`/`run_raw` call.
    ///
    /// # Safety
    /// The returned pointers point into the arena. Do not use after
    /// the next call to run/run_raw (arena data will be overwritten).
    pub fn run_raw(&mut self, inputs: &[(&str, &[f32])]) -> Vec<(*const f32, usize)> {
        self.inner.run_raw(inputs)
    }

    /// Fastest execution: inputs by slot index (order matches graph input declaration).
    /// Returns output (offset, len) pairs. Read data via `arena_ptr().add(offset)`.
    /// Zero HashMap lookup, zero Vec allocation, zero name matching.
    pub fn run_slots(&mut self, inputs: &[&[f32]]) -> &[(usize, usize)] {
        self.inner.run_slots(inputs)
    }

    /// Arena pointer for reading output data after `run_slots`.
    pub fn arena_ptr(&self) -> *const u8 {
        self.inner.arena_ptr()
    }

    /// Bind a persistent buffer (KV-cache, optimizer state, etc.).
    /// Stays alive across `run()` calls; the backend uses it as the
    /// graph input with the matching name.
    /// Returns true if the backend supports persistent handles.
    pub fn bind_handle(&mut self, name: &str, data: &[f32]) -> bool {
        self.inner.bind_handle(name, data)
    }

    /// Read the current contents of a persistent buffer.
    pub fn read_handle(&self, name: &str) -> Option<Vec<f32>> {
        self.inner.read_handle(name)
    }

    /// GPU-resident MLX input (no-op on non-MLX backends).
    pub fn bind_gpu_handle(&mut self, name: &str, data: &[f32]) -> bool {
        self.inner.bind_gpu_handle(name, data)
    }

    pub fn has_gpu_handle(&self, name: &str) -> bool {
        self.inner.has_gpu_handle(name)
    }

    pub fn set_gpu_handle_feed(&mut self, handle_name: &str, output_index: usize) -> bool {
        self.inner.set_gpu_handle_feed(handle_name, output_index)
    }

    pub fn read_gpu_handle(&self, name: &str) -> Option<Vec<f32>> {
        self.inner.read_gpu_handle(name)
    }

    /// Run, refresh GPU handle from output, return that output vector.
    pub fn run_feed_gpu_handle(
        &mut self,
        inputs: &[(&str, &[f32])],
        handle_name: &str,
        output_index: usize,
    ) -> Option<Vec<f32>> {
        self.inner
            .run_feed_gpu_handle(inputs, handle_name, output_index)
    }

    /// Hint subsequent `run` calls to process only the first `actual`
    /// rows along the bucket axis (out of `upper`, the compile extent).
    /// Backends that support per-kernel active-extent dispatch honor
    /// this; others ignore it. Pass `None` to clear.
    ///
    /// See `BucketedCompileCache::run_padded` for the canonical caller.
    pub fn set_active_extent(&mut self, extent: Option<(usize, usize)>) {
        self.inner.set_active_extent(extent);
    }

    /// TIDE merged MoE placement (`mask[expert]` device-resident if any layer has it).
    pub fn set_moe_resident_experts(&mut self, mask: &[bool]) {
        self.inner.set_moe_resident_experts(mask);
    }

    /// Per MoE layer placement (forward order). Preferred on CPU over merged mask.
    pub fn set_moe_resident_experts_per_layer(&mut self, masks: &[&[bool]]) {
        self.inner.set_moe_resident_experts_per_layer(masks);
    }

    /// Capture MoE router TopK on next forward (CPU). Returns false if unsupported.
    pub fn enable_moe_topk_capture(&mut self, num_experts: usize) -> bool {
        self.inner.enable_moe_topk_capture(num_experts)
    }

    /// Per-layer expert indices from the last forward (MoE router TopK order).
    pub fn take_moe_topk_capture(&mut self) -> Option<Vec<Vec<u32>>> {
        self.inner.take_moe_topk_capture()
    }

    /// GroupedMatMul GPU/CPU token accounting from the last forward (CPU).
    pub fn take_moe_residency_stats(&mut self) -> Option<crate::MoeResidencyStats> {
        self.inner.take_moe_residency_stats()
    }

    // ── Pipelined / async execution (Phase C) ─────────────────────────

    /// Encode + commit a forward pass without waiting for the device.
    ///
    /// Outputs of intermediate calls are stomped — use `run_pipelined`
    /// when you need each call's outputs back. Pair with `sync_pending`
    /// to drain. CPU is synchronous, so this falls back to `run`.
    pub fn commit_no_wait(&mut self, inputs: &[(&str, &[f32])]) {
        self.inner.commit_no_wait(inputs);
    }

    /// Wait for every command queued by `commit_no_wait`. CPU is a no-op.
    pub fn sync_pending(&mut self) {
        self.inner.sync_pending();
    }

    /// Pipelined batch run. Issues one commit per input set, syncs once
    /// at the end. On Metal, each commit gets its own output snapshot
    /// (allocated + blit-copied), so subsequent commits stomping the
    /// shared arena don't corrupt earlier runs' outputs.
    /// Returns `out[run_idx][output_idx][element_idx]`.
    pub fn run_pipelined(&mut self, input_sets: &[Vec<(&str, &[f32])>]) -> Vec<Vec<Vec<f32>>> {
        self.inner.run_pipelined(input_sets)
    }

    /// Set a named parameter from raw bytes in the given dtype. The
    /// backend handles the widen-to-f32 (or zero-widen, when supported
    /// natively) on the way in. Lets callers feed F16/BF16 weights
    /// without a host-side cast.
    pub fn set_param_typed(&mut self, name: &str, data: &[u8], dtype: rlx_ir::DType) {
        self.inner.set_param_typed(name, data, dtype);
    }

    /// Execute with typed inputs and return outputs in their declared
    /// graph dtype, byte-encoded. Mirrors the wgpu / MLX zero-widen
    /// semantics on f32-arena backends (CPU + Metal) by widening at
    /// the boundary.
    pub fn run_typed(
        &mut self,
        inputs: &[(&str, &[u8], rlx_ir::DType)],
    ) -> Vec<(Vec<u8>, rlx_ir::DType)> {
        self.inner.run_typed(inputs)
    }
}

#[cfg(test)]
mod tests {
    use crate::*;

    #[test]
    #[cfg(feature = "cpu")]
    fn end_to_end_session() {
        let mut g = Graph::new("matmul_bias_gelu");
        let x = g.input("x", Shape::new(&[2, 4], DType::F32));
        let w = g.param("w", Shape::new(&[4, 3], DType::F32));
        let b = g.param("b", Shape::new(&[3], DType::F32));
        let mm = g.matmul(x, w, Shape::new(&[2, 3], DType::F32));
        let add = g.binary(op::BinaryOp::Add, mm, b, Shape::new(&[2, 3], DType::F32));
        let out = g.activation(op::Activation::Gelu, add, Shape::new(&[2, 3], DType::F32));
        g.set_outputs(vec![out]);

        // Compile
        let session = Session::new(Device::Cpu);
        let mut compiled = session.compile(g);

        // Set weights
        // w = identity-ish [4, 3]: first 3 rows are I, last row is 0
        compiled.set_param(
            "w",
            &[1.0, 0.0, 0.0, 0.0, 1.0, 0.0, 0.0, 0.0, 1.0, 0.0, 0.0, 0.0],
        );
        compiled.set_param("b", &[0.5, -0.5, 0.0]);

        // Run
        let x_data = vec![
            1.0, 0.0, 0.0, 0.0, // row 0: [1,0,0,0] @ w = [1,0,0] + bias = [1.5,-0.5,0]
            0.0, 1.0, 0.0, 0.0, // row 1: [0,1,0,0] @ w = [0,1,0] + bias = [0.5, 0.5,0]
        ];
        let outputs = compiled.run(&[("x", &x_data)]);

        assert_eq!(outputs.len(), 1);
        let result = &outputs[0];
        assert_eq!(result.len(), 6); // [2, 3]

        // gelu(1.5) ≈ 1.399, gelu(-0.5) ≈ -0.154, gelu(0) = 0
        assert!(
            (result[0] - 1.399).abs() < 0.01,
            "gelu(1.5) = {}",
            result[0]
        );
        assert!(
            (result[1] - -0.154).abs() < 0.01,
            "gelu(-0.5) = {}",
            result[1]
        );
        assert!((result[2]).abs() < 0.01, "gelu(0) = {}", result[2]);

        // gelu(0.5) ≈ 0.346, gelu(0.5) ≈ 0.346, gelu(0) = 0
        assert!(
            (result[3] - 0.346).abs() < 0.01,
            "gelu(0.5) = {}",
            result[3]
        );
        assert!(
            (result[4] - 0.346).abs() < 0.01,
            "gelu(0.5) = {}",
            result[4]
        );

        // Run again with different input — zero allocation
        let x2 = vec![0.0f32; 8];
        let outputs2 = compiled.run(&[("x", &x2)]);
        // All zeros input → gelu(bias) for each output
        let r2 = &outputs2[0];
        assert!((r2[0] - 0.346).abs() < 0.01, "gelu(0.5) = {}", r2[0]); // gelu(0+0.5)
    }

    #[test]
    #[cfg(feature = "cpu")]
    fn device_display() {
        use crate::device_ext::is_available;
        assert!(format!("{}", Device::Cpu).starts_with("CPU"));
        assert!(is_available(Device::Cpu));
        // Backend availability is feature-gated; only assert
        // unavailable when the corresponding feature is off.
        #[cfg(not(feature = "gpu"))]
        assert!(!is_available(Device::Gpu));
        #[cfg(not(feature = "cuda"))]
        assert!(!is_available(Device::Cuda));
        #[cfg(not(feature = "rocm"))]
        assert!(!is_available(Device::Rocm));
        #[cfg(not(feature = "tpu"))]
        assert!(!is_available(Device::Tpu));
    }
}