amberjs 1.17.0

// WASM 编译器模块
//
// 提供 Wasmtime 引擎管理和 JavaScript 到 WebAssembly 的编译功能

use anyhow::{Context, Result, anyhow};
use std::collections::{BTreeMap, HashMap};
use std::sync::{Arc, Mutex};
use wasmtime::{Config, Engine, Module, OptLevel};
use wasmtime_wasi::{WasiCtx, WasiCtxBuilder};

/// Wasm 编译器结构体
///
/// 负责管理 Wasmtime 引擎实例，提供 JavaScript 到 WebAssembly 的编译功能
pub struct WasmCompiler {
    /// Wasmtime 引擎实例
    engine: Arc<Engine>,
    /// 编译配置
    config: Config,
}
impl WasmCompiler {
    /// 创建新的 Wasm 编译器实例
    ///
    /// # 返回值
    /// * `Result<WasmCompiler>` - 成功返回编译器实例，失败返回错误
    ///
    /// # 示例
    /// ```
    /// let compiler: _ = WasmCompiler::new()?;
    /// ```
    pub fn new() -> Result<Self> {
        let mut config = Config::default();
        // 启用所有性能优化
        config.cranelift_opt_level(OptLevel::SpeedAndSize);
        config.parallel_compilation(true);
        // 启用 wasm 优化
        config.wasm_reference_types(true);
        config.wasm_simd(true);
        config.wasm_bulk_memory(true);
        config.wasm_multi_value(true);
        // 启用分析 (暂时注释掉，ProfilerKind 类型不存在)
        // config.profiler(ProfilerKind::Perf);
        // 创建引擎
        let engine: _ = Engine::new(&config)
            .context("Failed to create Wasmtime engine")?;
        Ok(WasmCompiler {
            engine: Arc::new(Mutex::new(engine)))
            config,
        })
    }
    /// 获取引擎实例
    ///
    /// # 返回值
    /// * `&Arc<Engine>` - 引擎实例的引用
    pub fn engine(&self) -> &Arc<Engine> {
        &self.engine
    }
    /// 编译 JavaScript 代码到 WebAssembly
    ///
    /// # 参数
    /// * `js_code` - JavaScript 源代码
    /// * `wit_path` - 可选的 WIT 文件路径
    ///
    /// # 返回值
    /// * `Result<Vec<u8>` - 成功返回 WASM 字节，失败返回错误
    ///
    /// # 示例
    /// ```
    /// let js_code: _ = "export function add(a, b) { return a + b; }";
    /// let wasm_bytes: _ = compiler.compile_js_to_wasm(js_code, None)?;
    /// ```
    pub fn compile_js_to_wasm(&self, js_code: &str, wit_path: Option<&str>) -> Result<Vec<u8> {
        // 注意：实际的 Javy 集成需要额外的设置
        // 这里提供基本的编译框架，实际的 JS -> WASM 编译需要 Javy 工具链
        // 模拟编译过程 - 在实际实现中，这里会调用 Javy
        // let wasm_bytes: _ = self.invoke_javy_compiler(js_code, wit_path)?;
        // 为了演示，返回一个简单的 WASM 模块
        // 这将在实际实现中替换为真正的 Javy 编译
        let wasm_bytes: _ = self.generate_demo_wasm(js_code)?;
        Ok(wasm_bytes)
    }
    /// 生成演示用的 WASM 字节码
    ///
    /// # 参数
    /// * `js_code` - JavaScript 代码（用于生成标识）
    ///
    /// # 返回值
    /// * `Result<Vec<u8>` - WASM 字节码
    fn generate_demo_wasm(&self, js_code: &str) -> Result<Vec<u8> {
        let mut module = Module::new();
        // Type section
        let mut types = TypeSection::new();
        // func() -> i32
        types.function([ValType::I32, ValType::I32], [ValType::I32]);
        // func(i32) -> i32
        types.function([ValType::I32], [ValType::I32]);
        let types_id: _ = module.section(&types);
        // Function section
        let mut functions = FunctionSection::new();
        functions.function(types_id, 0);
        functions.function(types_id, 1);
        let functions_id: _ = module.section(&functions);
        // Export section
        let mut exports = ExportSection::new();
        exports.function("add", functions_id, 0);
        exports.function("main", functions_id, 1);
        let _exports_id: _ = module.section(&exports);
        // Code section
        let mut codes = CodeSection::new();
        // add 函数实现
        let mut func = Function::new([]);
        func.instruction(&Instruction::LocalGet(0));
        func.instruction(&Instruction::LocalGet(1));
        func.instruction(&Instruction::I32Add);
        func.instruction(&Instruction::End);
        codes.function(&func);
        // main 函数实现
        let mut func2 = Function::new([]);
        func2.instruction(&Instruction::I32Const(42));
        func2.instruction(&Instruction::End);
        codes.function(&func2);
        module.section(&codes);
        Ok(module.finish())
    }
    /// 验证 WebAssembly 模块
    ///
    /// # 参数
    /// * `wasm_bytes` - WASM 字节码
    ///
    /// # 返回值
    /// * `Result<()>` - 验证成功返回空，失败返回错误
    pub fn validate_wasm(&self, wasm_bytes: &[u8]) -> Result<()> {
        Module::validate(&self.engine, wasm_bytes)
            .context("WASM module validation failed")
    }
    /// 创建 WASI 上下文
    ///
    /// # 返回值
    /// * `Result<WasiCtx>` - WASI 上下文
    pub fn create_wasi_context(&self) -> Result<WasiCtx> {
        let wasi: _ = WasiCtxBuilder::new()
            .build();
        Ok(wasi)
    }
    /// 获取编译器配置信息
    ///
    /// # 返回值
    /// * `String` - 配置信息
    pub fn get_config_info(&self) -> String {
        format!(
            "WasmCompiler Config:\n\
             - Optimization: SpeedAndSize\n\
             - Parallel Compilation: Enabled\n\
             - WASM Features: Reference Types, SIMD, Bulk Memory, Multi-Value\n\
             - Profiler: Perf"
        )
    }
}
impl Default for WasmCompiler {
    fn default() -> Self {
        Self::new().expect("Failed to create WasmCompiler")
    }
}
#[cfg(test)]
mod tests {
    #[test]
    fn test_compiler_creation() {
        let compiler: _ = WasmCompiler::new();
        assert!(compiler.is_ok());
    }
    #[test]
    fn test_compiler_engine() {
        let compiler: _ = WasmCompiler::new().unwrap();
        assert!(compiler.engine().clone().into_parts().0.is_some());
    }
    #[test]
    fn test_demo_wasm_generation() {
        let compiler: _ = WasmCompiler::new().unwrap();
        let js_code: _ = "export function add(a, b) { return a + b; }";
        let wasm_bytes: _ = compiler.generate_demo_wasm(js_code);
        assert!(wasm_bytes.is_ok());
        let wasm_bytes: _ = wasm_bytes.unwrap();
        assert!(!wasm_bytes.is_empty());
    }
    #[test]
    fn test_wasm_validation() {
        let compiler: _ = WasmCompiler::new().unwrap();
        let js_code: _ = "export function test() { return 42; }";
        let wasm_bytes: _ = compiler.generate_demo_wasm(js_code).unwrap();
        let result: _ = compiler.validate_wasm(&wasm_bytes);
        assert!(result.is_ok());
    }
    #[test]
    fn test_config_info() {
        let compiler: _ = WasmCompiler::new().unwrap();
        let config_info: _ = compiler.get_config_info();
        assert!(config_info.contains("WasmCompiler"));
        assert!(config_info.contains("SpeedAndSize"));
        assert!(config_info.contains("Parallel Compilation"));
    }
    #[test]
    fn test_wasi_context_creation() {
        let compiler: _ = WasmCompiler::new().unwrap();
        let wasi: _ = compiler.create_wasi_context();
        assert!(wasi.is_ok());
    }
}