cuda_rust_wasm/backend/
wasm_runtime.rs

1//! WASM runtime backend implementation
2
3use super::backend_trait::{BackendTrait, BackendCapabilities, MemcpyKind};
4use crate::{Result, runtime_error};
5use std::sync::Arc;
6use async_trait::async_trait;
7
8/// CPU-based runtime backend for WASM environments
9pub struct WasmRuntime {
10    capabilities: BackendCapabilities,
11}
12
13impl Default for WasmRuntime {
14    fn default() -> Self {
15        Self::new()
16    }
17}
18
19impl WasmRuntime {
20    /// Create a new WASM runtime backend
21    pub fn new() -> Self {
22        Self {
23            capabilities: BackendCapabilities {
24                name: "WASM Runtime".to_string(),
25                supports_cuda: false,
26                supports_opencl: false,
27                supports_vulkan: false,
28                supports_webgpu: false,
29                max_threads: 1,
30                max_threads_per_block: 1,
31                max_blocks_per_grid: 1,
32                max_shared_memory: 0,
33                supports_dynamic_parallelism: false,
34                supports_unified_memory: false,
35                max_grid_dim: [1, 1, 1],
36                max_block_dim: [1, 1, 1],
37                warp_size: 1,
38            },
39        }
40    }
41}
42
43#[async_trait]
44impl BackendTrait for WasmRuntime {
45    fn name(&self) -> &str {
46        &self.capabilities.name
47    }
48    fn capabilities(&self) -> &BackendCapabilities {
49        &self.capabilities
50    }
51    
52    async fn initialize(&mut self) -> Result<()> {
53        // No initialization needed for WASM runtime
54        Ok(())
55    }
56    
57    async fn compile_kernel(&self, _source: &str) -> Result<Vec<u8>> {
58        // For WASM runtime, we don't compile kernels
59        Err(runtime_error!("Kernel compilation not supported on WASM runtime backend"))
60    }
61    
62    async fn launch_kernel(
63        &self,
64        _kernel: &[u8],
65        _grid: (u32, u32, u32),
66        _block: (u32, u32, u32),
67        _args: &[*const u8],
68    ) -> Result<()> {
69        Err(runtime_error!("Kernel launch not supported on WASM runtime backend"))
70    }
71    
72    fn allocate_memory(&self, size: usize) -> Result<*mut u8> {
73        // For CPU backend, we just use regular heap allocation
74        let layout = std::alloc::Layout::from_size_align(size, 8)
75            .map_err(|e| runtime_error!("Invalid layout: {}", e))?;
76        
77        let ptr = unsafe { std::alloc::alloc(layout) };
78        
79        if ptr.is_null() {
80            return Err(runtime_error!("Failed to allocate {} bytes", size));
81        }
82        
83        Ok(ptr)
84    }
85    
86    fn free_memory(&self, ptr: *mut u8) -> Result<()> {
87        // We don't track size, so we'll use a reasonable default alignment
88        // In a real implementation, we'd need to track allocated sizes
89        // For now, this is just a stub
90        Ok(())
91    }
92    
93    fn copy_memory(
94        &self,
95        dst: *mut u8,
96        src: *const u8,
97        size: usize,
98        _kind: MemcpyKind,
99    ) -> Result<()> {
100        // Safety: This function assumes the caller has verified the pointers are valid
101        // and don't overlap, as required by the trait contract
102        unsafe {
103            std::ptr::copy_nonoverlapping(src, dst, size);
104        }
105        Ok(())
106    }
107    
108    fn synchronize(&self) -> Result<()> {
109        // No-op for CPU backend
110        Ok(())
111    }
112    
113}
cuda_rust_wasm/backend/wasm_runtime.rs

cuda_rust_wasm/backend/
wasm_runtime.rs
