Compiler Entry Points

/**
 * Primary JVM compiler entry point for Kotlin 2.0+ (K2) compilation
 * Extends CLICompiler to provide JVM-specific compilation functionality
 */
class K2JVMCompiler : CLICompiler<K2JVMCompilerArguments>() {
    /** Command-line entry point for compilation */
    fun main(args: Array<String>): Unit
    
    /** Execute compilation with custom message collector and services */
    fun exec(
        messageCollector: MessageCollector, 
        services: Services, 
        arguments: K2JVMCompilerArguments
    ): ExitCode
    
    /** Execute compilation with error stream output */
    fun exec(
        errStream: PrintStream, 
        services: Services, 
        messageRenderer: MessageRenderer, 
        args: Array<String>
    ): ExitCode
    
    /** Create default compiler arguments instance */
    fun createArguments(): K2JVMCompilerArguments
    
    /** Check if K2 compiler should be used based on language version */
    fun shouldRunK2(messageCollector: MessageCollector, arguments: K2JVMCompilerArguments): Boolean
    
    /** Execute compilation using phased K2 pipeline */
    fun doExecutePhased(
        arguments: K2JVMCompilerArguments,
        services: Services,
        basicMessageCollector: MessageCollector
    ): ExitCode?
    
    /** Execute legacy compilation pipeline */
    fun doExecute(
        arguments: K2JVMCompilerArguments,
        configuration: CompilerConfiguration,
        rootDisposable: Disposable,
        paths: KotlinPaths?
    ): ExitCode
}

// Basic compilation
val compiler = K2JVMCompiler()
val arguments = K2JVMCompilerArguments().apply {
    destination = "build/classes"
    classpath = System.getProperty("java.class.path")
    jvmTarget = "17"
}

val messageCollector = PrintingMessageCollector(System.err, MessageRenderer.PLAIN, false)
val exitCode = compiler.exec(messageCollector, Services.EMPTY, arguments)

if (exitCode == ExitCode.OK) {
    println("Compilation successful")
} else {
    println("Compilation failed with code: $exitCode")
}

// Command-line style compilation
val args = arrayOf(
    "-d", "build/classes",
    "-cp", "libs/kotlin-stdlib.jar", 
    "src/main.kt"
)
K2JVMCompiler.main(args)

/**
 * Abstract base compiler providing common CLI functionality
 * Extended by platform-specific compilers like K2JVMCompiler
 */
abstract class CLICompiler<A : CommonCompilerArguments> {
    /** Default performance manager for compilation metrics */
    abstract val defaultPerformanceManager: PerformanceManager
    
    /** Execute compilation with XML output format */
    fun execAndOutputXml(errStream: PrintStream, services: Services, vararg args: String): ExitCode
    
    /** Execute compilation with full file paths in messages */
    fun execFullPathsInMessages(errStream: PrintStream, args: Array<String>): ExitCode
    
    /** Determine if K2 compiler should be used based on language version */
    protected open fun shouldRunK2(messageCollector: MessageCollector, arguments: A): Boolean
    
    /** Create performance manager for compilation tracking */
    protected open fun createPerformanceManager(arguments: A, services: Services): PerformanceManager
    
    /** Load compiler plugins based on configuration */
    protected fun loadPlugins(
        paths: KotlinPaths?, 
        arguments: A, 
        configuration: CompilerConfiguration,
        rootDisposable: Disposable
    ): ExitCode
    
    /** Create arguments parser for command-line parsing */
    protected abstract fun createArguments(): A
    
    /** Perform compilation with given configuration */
    protected abstract fun doExecute(
        arguments: A,
        configuration: CompilerConfiguration,
        rootDisposable: Disposable,
        paths: KotlinPaths?
    ): ExitCode
}

/**
 * Compilation result codes indicating success or failure reasons
 */
enum class ExitCode {
    /** Compilation completed successfully */
    OK,
    /** Compilation failed due to compilation errors */
    COMPILATION_ERROR,
    /** Compilation failed due to internal compiler error */
    INTERNAL_ERROR,
    /** Compilation failed due to out of memory error */
    OOM_ERROR
}

/**
 * Interface for tracking compilation performance metrics
 */
interface PerformanceManager {
    /** Enable performance statistics collection */
    fun enableCollectingPerformanceStatistics(isK2: Boolean): Unit
    
    /** Get collected performance statistics */
    fun getPerformanceStatistics(): Map<String, Long>
    
    /** Reset performance counters */
    fun resetPerformanceCounters(): Unit
}

/**
 * Performance manager with profiling capabilities
 */
class ProfilingCompilerPerformanceManager : PerformanceManager {
    /** Start timing a specific operation */
    fun startTiming(operationName: String): Unit
    
    /** End timing a specific operation */
    fun endTiming(operationName: String): Unit
    
    /** Get timing results for all operations */
    fun getTimingResults(): Map<String, Duration>
}

/**
 * Core compilation environment providing project context and resource management
 * Essential for setting up compilation infrastructure and managing resources
 */
class KotlinCoreEnvironment private constructor() {
    /** Create production environment for compilation */
    companion object {
        fun createForProduction(
            parentDisposable: Disposable,
            configuration: CompilerConfiguration,
            configFiles: EnvironmentConfigFiles
        ): KotlinCoreEnvironment
        
        /** Get or create application environment */
        fun getOrCreateApplicationEnvironmentForProduction(
            parentDisposable: Disposable,
            configuration: CompilerConfiguration
        ): ApplicationEnvironment
    }
    
    /** Get project instance for compilation */
    val project: Project
    
    /** Get source files for compilation */
    val getSourceFiles(): List<KtFile>
    
    /** Register source roots */
    fun registerSourceRoots(sourceRoots: List<File>): Unit
    
    /** Dispose resources and cleanup */
    fun dispose(): Unit
}

/**
 * Environment configuration files enum
 */
enum class EnvironmentConfigFiles {
    /** JVM configuration files */
    JVM_CONFIG_FILES,
    /** Metadata configuration files */
    METADATA_CONFIG_FILES,
    /** Native configuration files */
    NATIVE_CONFIG_FILES
}

/**
 * Main JVM bytecode generation object
 * Provides high-level compilation functionality for generating JVM bytecode
 */
object KotlinToJVMBytecodeCompiler {
    /** Compile modules to JVM bytecode */
    fun compileModules(
        environment: KotlinCoreEnvironment,
        buildFile: GenerationState.GenerationStateEventCallback?,
        chunk: ModuleChunk
    ): Boolean
    
    /** Analyze and compile sources */
    fun analyzeAndGenerate(
        environment: KotlinCoreEnvironment
    ): GenerationState?
    
    /** Create generation state for compilation */
    fun createGenerationState(
        environment: KotlinCoreEnvironment,
        configuration: CompilerConfiguration
    ): GenerationState
}

/**
 * Generation state containing compilation results and bytecode
 */
interface GenerationState {
    /** Generated class files */
    val factory: ClassFileFactory
    
    /** Compilation diagnostics */
    val collectedExtraJvmDiagnostics: Collection<Diagnostic>
    
    /** Generation state event callback interface */
    interface GenerationStateEventCallback {
        fun beforeCompile(environment: KotlinCoreEnvironment): Unit
        fun afterAnalysis(environment: KotlinCoreEnvironment, analysisResult: AnalysisResult): Unit
        fun afterGeneration(environment: KotlinCoreEnvironment, state: GenerationState): Unit
    }
}

// Custom performance tracking
val performanceManager = ProfilingCompilerPerformanceManager()
val compiler = K2JVMCompiler()

val arguments = K2JVMCompilerArguments().apply {
    reportPerf = true // Enable performance reporting
}

val configuration = CompilerConfiguration().apply {
    put(CLIConfigurationKeys.PERF_MANAGER, performanceManager)
}

val exitCode = compiler.doExecute(arguments, configuration, Disposer.newDisposable(), null)
val stats = performanceManager.getPerformanceStatistics()
println("Compilation took: ${stats["total"]}ms")

// Plugin loading with error handling
val pluginResult = compiler.loadPlugins(kotlinPaths, arguments, configuration, disposable)
if (pluginResult != ExitCode.OK) {
    println("Failed to load plugins: $pluginResult")
}