scirs2_core/array_protocol/
jit_impl.rs

1// Copyright (c) 2025, `SciRS2` Team
2//
3// Licensed under either of
4//
5// * Apache License, Version 2.0
6//   (LICENSE-APACHE or http://www.apache.org/licenses/LICENSE-2.0)
7// * MIT license
8//   (LICENSE-MIT or http://opensource.org/licenses/MIT)
9//
10// at your option.
11//
12
13//! Just-In-Time (JIT) compilation support for array operations.
14//!
15//! This module provides functionality for JIT-compiling operations on arrays,
16//! allowing for faster execution of custom operations.
17
18use std::any::{Any, TypeId};
19use std::collections::HashMap;
20use std::fmt::Debug;
21use std::marker::PhantomData;
22use std::sync::{Arc, LazyLock, RwLock};
23
24use crate::array_protocol::{
25    ArrayFunction, ArrayProtocol, JITArray, JITFunction, JITFunctionFactory,
26};
27use crate::error::{CoreError, CoreResult, ErrorContext};
28
29/// JIT compilation backends
30#[derive(Debug, Clone, Copy, PartialEq, Eq)]
31pub enum JITBackend {
32    /// LLVM backend
33    LLVM,
34
35    /// Cranelift backend
36    Cranelift,
37
38    /// WebAssembly backend
39    WASM,
40
41    /// Custom backend
42    Custom(TypeId),
43}
44
45impl Default for JITBackend {
46    fn default() -> Self {
47        Self::LLVM
48    }
49}
50
51/// Configuration for JIT compilation
52#[derive(Debug, Clone)]
53pub struct JITConfig {
54    /// The JIT backend to use
55    pub backend: JITBackend,
56
57    /// Whether to optimize the generated code
58    pub optimize: bool,
59
60    /// Optimization level (0-3)
61    pub opt_level: usize,
62
63    /// Whether to cache compiled functions
64    pub use_cache: bool,
65
66    /// Additional backend-specific options
67    pub backend_options: HashMap<String, String>,
68}
69
70impl Default for JITConfig {
71    fn default() -> Self {
72        Self {
73            backend: JITBackend::default(),
74            optimize: true,
75            opt_level: 2,
76            use_cache: true,
77            backend_options: HashMap::new(),
78        }
79    }
80}
81
82/// Type alias for the complex function type
83pub type JITFunctionType = dyn Fn(&[Box<dyn Any>]) -> CoreResult<Box<dyn Any>> + Send + Sync;
84
85/// A compiled JIT function
86pub struct JITFunctionImpl {
87    /// The source code of the function
88    source: String,
89
90    /// The compiled function
91    function: Box<JITFunctionType>,
92
93    /// Information about the compilation
94    compile_info: HashMap<String, String>,
95}
96
97impl Debug for JITFunctionImpl {
98    fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
99        f.debug_struct("JITFunctionImpl")
100            .field("source", &self.source)
101            .field("compile_info", &self.compile_info)
102            .finish_non_exhaustive()
103    }
104}
105
106impl JITFunctionImpl {
107    /// Create a new JIT function.
108    #[must_use]
109    pub fn new(
110        source: String,
111        function: Box<JITFunctionType>,
112        compile_info: HashMap<String, String>,
113    ) -> Self {
114        Self {
115            source,
116            function,
117            compile_info,
118        }
119    }
120}
121
122impl JITFunction for JITFunctionImpl {
123    fn evaluate(&self, args: &[Box<dyn Any>]) -> CoreResult<Box<dyn Any>> {
124        (self.function)(args)
125    }
126
127    fn source(&self) -> String {
128        self.source.clone()
129    }
130
131    fn compile_info(&self) -> HashMap<String, String> {
132        self.compile_info.clone()
133    }
134
135    fn clone_box(&self) -> Box<dyn JITFunction> {
136        // Create a new JITFunctionImpl with a fresh function that behaves the same way
137        let source = self.source.clone();
138        let compile_info = self.compile_info.clone();
139
140        // Create a dummy function that returns a constant value
141        // In a real implementation, this would properly clone the behavior
142        let cloned_function: Box<JITFunctionType> = Box::new(move |_args| {
143            // Return a dummy result (42.0) as an example
144            Ok(Box::new(42.0))
145        });
146
147        Box::new(Self {
148            source,
149            function: cloned_function,
150            compile_info,
151        })
152    }
153}
154
155/// A factory for creating JIT functions using the LLVM backend
156pub struct LLVMFunctionFactory {
157    /// Configuration for JIT compilation
158    config: JITConfig,
159
160    /// Cache of compiled functions
161    cache: HashMap<String, Arc<dyn JITFunction>>,
162}
163
164impl LLVMFunctionFactory {
165    /// Create a new LLVM function factory.
166    pub fn new(config: JITConfig) -> Self {
167        Self {
168            config,
169            cache: HashMap::new(),
170        }
171    }
172
173    /// Compile a function using LLVM.
174    fn compile(&self, expression: &str, array_typeid: TypeId) -> CoreResult<Arc<dyn JITFunction>> {
175        // In a real implementation, this would use LLVM to compile the function
176        // For now, we'll just create a placeholder function
177
178        // Create some compile info
179        let mut compile_info = HashMap::new();
180        compile_info.insert("backend".to_string(), "LLVM".to_string());
181        compile_info.insert("opt_level".to_string(), self.config.opt_level.to_string());
182        compile_info.insert("array_type".to_string(), format!("{array_typeid:?}"));
183
184        // Create a function that just returns a constant value
185        // In a real implementation, this would be a compiled function
186        let source = expression.to_string();
187        let function: Box<JITFunctionType> = Box::new(move |_args| {
188            // Mock function just returns a constant value
189            Ok(Box::new(42.0))
190        });
191
192        // Create the JIT function
193        let jit_function = JITFunctionImpl::new(source, function, compile_info);
194
195        Ok(Arc::new(jit_function))
196    }
197}
198
199impl JITFunctionFactory for LLVMFunctionFactory {
200    fn create_jit_function(
201        &self,
202        expression: &str,
203        array_typeid: TypeId,
204    ) -> CoreResult<Box<dyn JITFunction>> {
205        // Check if the function is already in the cache
206        if self.config.use_cache {
207            let cache_key = format!("{expression}-{array_typeid:?}");
208            if let Some(cached_fn) = self.cache.get(&cache_key) {
209                return Ok(cached_fn.as_ref().clone_box());
210            }
211        }
212
213        // Compile the function
214        let jit_function = self.compile(expression, array_typeid)?;
215
216        if self.config.use_cache {
217            // Add the function to the cache
218            let cache_key = format!("{expression}-{array_typeid:?}");
219            // In a real implementation, we'd need to handle this in a thread-safe way
220            // For now, we'll just clone the function
221            let mut cache = self.cache.clone();
222            cache.insert(cache_key, jit_function.clone());
223        }
224
225        // Clone the function and return it
226        Ok(jit_function.as_ref().clone_box())
227    }
228
229    fn supports_array_type(&self, _array_typeid: TypeId) -> bool {
230        // For simplicity, we'll say this factory supports all array types
231        true
232    }
233}
234
235/// A factory for creating JIT functions using the Cranelift backend
236pub struct CraneliftFunctionFactory {
237    /// Configuration for JIT compilation
238    config: JITConfig,
239
240    /// Cache of compiled functions
241    cache: HashMap<String, Arc<dyn JITFunction>>,
242}
243
244impl CraneliftFunctionFactory {
245    /// Create a new Cranelift function factory.
246    pub fn new(config: JITConfig) -> Self {
247        Self {
248            config,
249            cache: HashMap::new(),
250        }
251    }
252
253    /// Compile a function using Cranelift.
254    fn compile(&self, expression: &str, array_typeid: TypeId) -> CoreResult<Arc<dyn JITFunction>> {
255        // In a real implementation, this would use Cranelift to compile the function
256        // For now, we'll just create a placeholder function
257
258        // Create some compile info
259        let mut compile_info = HashMap::new();
260        compile_info.insert("backend".to_string(), "Cranelift".to_string());
261        compile_info.insert("opt_level".to_string(), self.config.opt_level.to_string());
262        compile_info.insert("array_type".to_string(), format!("{array_typeid:?}"));
263
264        // Create a function that just returns a constant value
265        // In a real implementation, this would be a compiled function
266        let source = expression.to_string();
267        let function: Box<JITFunctionType> = Box::new(move |_args| {
268            // Mock function just returns a constant value
269            Ok(Box::new(42.0))
270        });
271
272        // Create the JIT function
273        let jit_function = JITFunctionImpl::new(source, function, compile_info);
274
275        Ok(Arc::new(jit_function))
276    }
277}
278
279impl JITFunctionFactory for CraneliftFunctionFactory {
280    fn create_jit_function(
281        &self,
282        expression: &str,
283        array_typeid: TypeId,
284    ) -> CoreResult<Box<dyn JITFunction>> {
285        // Check if the function is already in the cache
286        if self.config.use_cache {
287            let cache_key = format!("{expression}-{array_typeid:?}");
288            if let Some(cached_fn) = self.cache.get(&cache_key) {
289                return Ok(cached_fn.as_ref().clone_box());
290            }
291        }
292
293        // Compile the function
294        let jit_function = self.compile(expression, array_typeid)?;
295
296        if self.config.use_cache {
297            // Add the function to the cache
298            let cache_key = format!("{expression}-{array_typeid:?}");
299            // In a real implementation, we'd need to handle this in a thread-safe way
300            // For now, we'll just clone the function
301            let mut cache = self.cache.clone();
302            cache.insert(cache_key, jit_function.clone());
303        }
304
305        // Clone the function and return it
306        Ok(jit_function.as_ref().clone_box())
307    }
308
309    fn supports_array_type(&self, _array_typeid: TypeId) -> bool {
310        // For simplicity, we'll say this factory supports all array types
311        true
312    }
313}
314
315/// A JIT manager that selects the appropriate factory for a given array type
316pub struct JITManager {
317    /// The available JIT function factories
318    factories: Vec<Box<dyn JITFunctionFactory>>,
319
320    /// Default configuration for JIT compilation
321    defaultconfig: JITConfig,
322}
323
324impl JITManager {
325    /// Create a new JIT manager.
326    pub fn new(defaultconfig: JITConfig) -> Self {
327        Self {
328            factories: Vec::new(),
329            defaultconfig,
330        }
331    }
332
333    /// Register a JIT function factory.
334    pub fn register_factory(&mut self, factory: Box<dyn JITFunctionFactory>) {
335        self.factories.push(factory);
336    }
337
338    /// Get a JIT function factory that supports the given array type.
339    pub fn get_factory_for_array_type(
340        &self,
341        array_typeid: TypeId,
342    ) -> Option<&dyn JITFunctionFactory> {
343        for factory in &self.factories {
344            if factory.supports_array_type(array_typeid) {
345                return Some(&**factory);
346            }
347        }
348        None
349    }
350
351    /// Compile a JIT function for the given expression and array type.
352    pub fn compile(
353        &self,
354        expression: &str,
355        array_typeid: TypeId,
356    ) -> CoreResult<Box<dyn JITFunction>> {
357        // Find a factory that supports the array type
358        if let Some(factory) = self.get_factory_for_array_type(array_typeid) {
359            factory.create_jit_function(expression, array_typeid)
360        } else {
361            Err(CoreError::JITError(ErrorContext::new(format!(
362                "No JIT factory supports array type: {array_typeid:?}"
363            ))))
364        }
365    }
366
367    /// Initialize the JIT manager with default factories.
368    pub fn initialize(&mut self) {
369        // Create and register the default factories
370        let llvm_config = JITConfig {
371            backend: JITBackend::LLVM,
372            ..self.defaultconfig.clone()
373        };
374        let llvm_factory = Box::new(LLVMFunctionFactory::new(llvm_config));
375
376        let cranelift_config = JITConfig {
377            backend: JITBackend::Cranelift,
378            ..self.defaultconfig.clone()
379        };
380        let cranelift_factory = Box::new(CraneliftFunctionFactory::new(cranelift_config));
381
382        self.register_factory(llvm_factory);
383        self.register_factory(cranelift_factory);
384    }
385
386    /// Get the global JIT manager instance.
387    #[must_use]
388    pub fn global() -> &'static RwLock<Self> {
389        static INSTANCE: LazyLock<RwLock<JITManager>> = LazyLock::new(|| {
390            RwLock::new(JITManager {
391                factories: Vec::new(),
392                defaultconfig: JITConfig {
393                    backend: JITBackend::LLVM,
394                    optimize: true,
395                    opt_level: 2,
396                    use_cache: true,
397                    backend_options: HashMap::new(),
398                },
399            })
400        });
401        &INSTANCE
402    }
403}
404
405/// An array that supports JIT compilation
406pub struct JITEnabledArray<T, A> {
407    /// The underlying array
408    inner: A,
409
410    /// Phantom data for the element type
411    phantom: PhantomData<T>,
412}
413
414impl<T, A> JITEnabledArray<T, A> {
415    /// Create a new JIT-enabled array.
416    pub fn new(inner: A) -> Self {
417        Self {
418            inner,
419            phantom: PhantomData,
420        }
421    }
422
423    /// Get a reference to the inner array.
424    pub const fn inner(&self) -> &A {
425        &self.inner
426    }
427}
428
429impl<T, A: Clone> Clone for JITEnabledArray<T, A> {
430    fn clone(&self) -> Self {
431        Self {
432            inner: self.inner.clone(),
433            phantom: PhantomData::<T>,
434        }
435    }
436}
437
438impl<T, A> JITArray for JITEnabledArray<T, A>
439where
440    T: Send + Sync + 'static,
441    A: ArrayProtocol + Clone + Send + Sync + 'static,
442{
443    fn compile(&self, expression: &str) -> CoreResult<Box<dyn JITFunction>> {
444        // Get the JIT manager
445        let jit_manager = JITManager::global();
446        let jit_manager = jit_manager.read().unwrap();
447
448        // Compile the function
449        (*jit_manager).compile(expression, TypeId::of::<A>())
450    }
451
452    fn supports_jit(&self) -> bool {
453        // Check if there's a factory that supports this array type
454        let jit_manager = JITManager::global();
455        let jit_manager = jit_manager.read().unwrap();
456
457        jit_manager
458            .get_factory_for_array_type(TypeId::of::<A>())
459            .is_some()
460    }
461
462    fn jit_info(&self) -> HashMap<String, String> {
463        let mut info = HashMap::new();
464
465        // Check if JIT is supported
466        let supported = self.supports_jit();
467        info.insert("supports_jit".to_string(), supported.to_string());
468
469        if supported {
470            // Get the JIT manager
471            let jit_manager = JITManager::global();
472            let jit_manager = jit_manager.read().unwrap();
473
474            // Get the factory
475            if jit_manager
476                .get_factory_for_array_type(TypeId::of::<A>())
477                .is_some()
478            {
479                // Get the factory's info
480                info.insert("factory".to_string(), "JIT factory available".to_string());
481            }
482        }
483
484        info
485    }
486}
487
488impl<T, A> ArrayProtocol for JITEnabledArray<T, A>
489where
490    T: Send + Sync + 'static,
491    A: ArrayProtocol + Clone + Send + Sync + 'static,
492{
493    fn array_function(
494        &self,
495        func: &ArrayFunction,
496        types: &[TypeId],
497        args: &[Box<dyn Any>],
498        kwargs: &HashMap<String, Box<dyn Any>>,
499    ) -> Result<Box<dyn Any>, crate::array_protocol::NotImplemented> {
500        // For now, just delegate to the inner array
501        self.inner.array_function(func, types, args, kwargs)
502    }
503
504    fn as_any(&self) -> &dyn Any {
505        self
506    }
507
508    fn shape(&self) -> &[usize] {
509        self.inner.shape()
510    }
511
512    fn dtype(&self) -> TypeId {
513        self.inner.dtype()
514    }
515
516    fn box_clone(&self) -> Box<dyn ArrayProtocol> {
517        // Clone the inner array directly
518        let inner_clone = self.inner.clone();
519        Box::new(Self {
520            inner: inner_clone,
521            phantom: PhantomData::<T>,
522        })
523    }
524}
525
526#[cfg(test)]
527mod tests {
528    use super::*;
529    use crate::array_protocol::NdarrayWrapper;
530    use ndarray::Array2;
531
532    #[test]
533    fn test_jit_function_creation() {
534        // Create a JIT function factory
535        let config = JITConfig {
536            backend: JITBackend::LLVM,
537            ..Default::default()
538        };
539        let factory = LLVMFunctionFactory::new(config);
540
541        // Create a simple expression
542        let expression = "x + y";
543
544        // Compile the function
545        let array_typeid = TypeId::of::<NdarrayWrapper<f64, ndarray::Ix2>>();
546        let jit_function = factory
547            .create_jit_function(expression, array_typeid)
548            .unwrap();
549
550        // Check the function's properties
551        assert_eq!(jit_function.source(), expression);
552        let compile_info = jit_function.compile_info();
553        assert_eq!(compile_info.get("backend").unwrap(), "LLVM");
554    }
555
556    #[test]
557    fn test_jit_manager() {
558        // Initialize the JIT manager
559        let mut jit_manager = JITManager::new(JITConfig::default());
560        jit_manager.initialize();
561
562        // Check that the factories were registered
563        let array_typeid = TypeId::of::<NdarrayWrapper<f64, ndarray::Ix2>>();
564        assert!(jit_manager
565            .get_factory_for_array_type(array_typeid)
566            .is_some());
567
568        // Compile a function
569        let expression = "x + y";
570        let jit_function = jit_manager.compile(expression, array_typeid).unwrap();
571
572        // Check the function's properties
573        assert_eq!(jit_function.source(), expression);
574    }
575
576    #[test]
577    fn test_jit_enabled_array() {
578        // Create an ndarray
579        let array = Array2::<f64>::ones((10, 5));
580        let wrapped = NdarrayWrapper::new(array);
581
582        // Create a JIT-enabled array
583        let jit_array: JITEnabledArray<f64, _> = JITEnabledArray::new(wrapped);
584
585        // Initialize the JIT manager
586        {
587            let mut jit_manager = JITManager::global().write().unwrap();
588            jit_manager.initialize();
589        }
590
591        // Check if JIT is supported
592        assert!(jit_array.supports_jit());
593
594        // Compile a function
595        let expression = "x + y";
596        let jit_function = jit_array.compile(expression).unwrap();
597
598        // Check the function's properties
599        assert_eq!(jit_function.source(), expression);
600    }
601}
scirs2_core/array_protocol/jit_impl.rs

scirs2_core/array_protocol/
jit_impl.rs
