amberjs 1.17.0

// 启动优化器
// 优化运行时启动性能，减少首次执行开销

use std::collections::{BTreeMap, HashMap};
use std::sync::{Arc, Mutex};
use rusty_v8 as v8;
use std::time::Duration;
use std::time::SystemTime;

/// 内存预分配器
pub struct MemoryPreallocator {
    /// 预分配大小（字节）
    prealloc_size: usize,
    /// 统计信息
    stats: Arc<Mutex<MemoryStats>>,
    /// 创建时间
    created_at: SystemTime,
}
impl MemoryPreallocator {
    /// 创建新的内存预分配器
    pub fn new(prealloc_size: usize) -> Self {
        Self {
            prealloc_size,
            stats: Arc::new(Mutex::new(MemoryStats::new())),
            created_at: SystemTime::now(),
        }
    }
    /// 预分配内存
    pub fn preallocate(&self, _runtime: &mut RuntimeLite) -> Result<(), Box<dyn std::error::Error + Send + Sync>> {
        // Note: Memory preallocation will be implemented with proper V8 integration
        // For now, this is a placeholder
        // 更新统计
        {
            let mut stats = self.stats.lock().unwrap();
            stats.preallocations_performed += 1;
            stats.preallocated_bytes += self.prealloc_size;
        }
        Ok(())
    }
    /// 预分配常用对象
    fn preallocate_objects(&self, _scope: &mut v8::PinScope) -> Result<(), Box<dyn std::error::Error + Send + Sync>> {
        // Note: Object preallocation will be implemented with proper V8 integration
        Ok(())
    }
    /// 获取统计信息
    pub fn get_stats(&self) -> MemoryStats {
        self.stats.lock().unwrap().clone()
    }
    /// 获取预分配器年龄
    pub fn age(&self) -> Duration {
        self.created_at.elapsed().unwrap_or_default()
    }
}
/// 内存预分配统计
#[derive(Debug, Clone)]
pub struct MemoryStats {
    pub preallocations_performed: u64,
    pub preallocated_bytes: usize,
    pub cache_hits: u64,
    pub cache_misses: u64,
}
impl MemoryStats {
    pub fn new() -> Self {
        Self {
            preallocations_performed: 0,
            preallocated_bytes: 0,
            cache_hits: 0,
            cache_misses: 0,
        }
    }
    pub fn hit_rate(&self) -> f64 {
        let total: _ = self.cache_hits + self.cache_misses;
        if total > 0 {
            self.cache_hits as f64 / total as f64
        } else {
            0.0
        }
    }
}
impl Default for MemoryStats {
    fn default() -> Self {
        Self::new()
    }
}
/// JIT 预编译器
pub struct JITPrecompiler {
    /// 预编译统计
    pub stats: Arc<Mutex<JITStats>>,
    /// 创建时间
    created_at: SystemTime,
    /// 预编译的函数
    precompiled_functions: HashMap<String, PrecompiledFunction>,
}
impl JITPrecompiler {
    /// 创建新的 JIT 预编译器
    pub fn new() -> Self {
        Self {
            stats: Arc::new(Mutex::new(JITStats::new())),
            created_at: SystemTime::now(),
            precompiled_functions: HashMap::new(),
        }
    }
    /// 预编译代码
    pub fn precompile_code(&self, _runtime: &mut RuntimeLite, code: &str) -> Result<(), Box<dyn std::error::Error + Send + Sync>> {
        // Note: JIT precompilation will be implemented with proper V8 integration
        // For now, this is a placeholder
        // 更新统计
        {
            let mut stats = self.stats.lock().unwrap();
            stats.precompiled_functions += 1;
            stats.total_bytes_compiled += code.len();
        }
        Ok(())
    }
    /// 获取统计信息
    pub fn get_stats(&self) -> JITStats {
        self.stats.lock().unwrap().clone()
    }
    /// 获取预编译器年龄
    pub fn age(&self) -> Duration {
        self.created_at.elapsed().unwrap_or_default()
    }
}
/// JIT 预编译统计
#[derive(Debug, Clone)]
pub struct JITStats {
    pub precompiled_functions: u64,
    pub total_bytes_compiled: usize,
    pub compilation_errors: u64,
    pub cache_hits: u64,
    pub cache_misses: u64,
}
impl JITStats {
    pub fn new() -> Self {
        Self {
            precompiled_functions: 0,
            total_bytes_compiled: 0,
            compilation_errors: 0,
            cache_hits: 0,
            cache_misses: 0,
        }
    }
    pub fn hit_rate(&self) -> f64 {
        let total: _ = self.cache_hits + self.cache_misses;
        if total > 0 {
            self.cache_hits as f64 / total as f64
        } else {
            0.0
        }
    }
}
impl Default for JITStats {
    fn default() -> Self {
        Self::new()
    }
}
/// 预编译函数信息
#[derive(Debug, Clone)]
struct PrecompiledFunction {
    name: String,
    code: String,
    compiled_at: SystemTime,
    size_bytes: usize,
}
#[cfg(test)]
mod tests {
    #[test]
    fn test_memory_preallocator_creation() {
        let preallocator: _ = MemoryPreallocator::new(1024);
        let stats: _ = preallocator.get_stats();
        assert_eq!(stats.preallocations_performed, 0);
        assert_eq!(stats.preallocated_bytes, 0);
    }
    #[test]
    fn test_jit_precompiler_creation() {
        let precompiler: _ = JITPrecompiler::new();
        let stats: _ = precompiler.get_stats();
        assert_eq!(stats.precompiled_functions, 0);
        assert_eq!(stats.total_bytes_compiled, 0);
    }
    #[test]
    fn test_stats_hit_rate() {
        let stats: _ = MemoryStats::new();
        assert_eq!(stats.hit_rate(), 0.0);
        let mut stats = JITStats::new();
        stats.cache_hits = 80;
        stats.cache_misses = 20;
        assert_eq!(stats.hit_rate(), 0.8);
    }
}