import jdk.nashorn.internal.codegen.Compiler.CompilationPhases; //导入依赖的package包/类
@Override
FunctionNode transform(final Compiler compiler, final CompilationPhases phases, final FunctionNode fn) {
    final CompileUnit  outermostCompileUnit = compiler.addCompileUnit(0L);

    FunctionNode newFunctionNode;

    //ensure elementTypes, postsets and presets exist for splitter and arraynodes
    newFunctionNode = transformFunction(fn, new SimpleNodeVisitor() {
        @Override
        public LiteralNode<?> leaveLiteralNode(final LiteralNode<?> literalNode) {
            return literalNode.initialize(lc);
        }
    });

    newFunctionNode = new Splitter(compiler, newFunctionNode, outermostCompileUnit).split(newFunctionNode, true);
    newFunctionNode = transformFunction(newFunctionNode, new SplitIntoFunctions(compiler));
    assert newFunctionNode.getCompileUnit() == outermostCompileUnit : "fn=" + fn.getName() + ", fn.compileUnit (" + newFunctionNode.getCompileUnit() + ") != " + outermostCompileUnit;
    assert newFunctionNode.isStrict() == compiler.isStrict() : "functionNode.isStrict() != compiler.isStrict() for " + quote(newFunctionNode.getName());

    return newFunctionNode;
}
 

import jdk.nashorn.internal.codegen.Compiler.CompilationPhases; //导入依赖的package包/类
private FunctionInitializer compileTypeSpecialization(final MethodType actualCallSiteType, final ScriptObject runtimeScope, final boolean persist) {
    // We're creating an empty script object for holding local variables. AssignSymbols will populate it with
    // explicit Undefined values for undefined local variables (see AssignSymbols#defineSymbol() and
    // CompilationEnvironment#declareLocalSymbol()).

    if (log.isEnabled()) {
        log.info("Parameter type specialization of '", functionName, "' signature: ", actualCallSiteType);
    }

    final boolean persistentCache = usePersistentCodeCache() && persist;
    String cacheKey = null;
    if (persistentCache) {
        final TypeMap typeMap = typeMap(actualCallSiteType);
        final Type[] paramTypes = typeMap == null ? null : typeMap.getParameterTypes(functionNodeId);
        cacheKey = CodeStore.getCacheKey(functionNodeId, paramTypes);
        final CodeInstaller<ScriptEnvironment> newInstaller = getInstallerForNewCode();
        final StoredScript script = newInstaller.loadScript(source, cacheKey);

        if (script != null) {
            Compiler.updateCompilationId(script.getCompilationId());
            return installStoredScript(script, newInstaller);
        }
    }

    final FunctionNode fn = reparse();
    final Compiler compiler = getCompiler(fn, actualCallSiteType, runtimeScope);
    final FunctionNode compiledFn = compiler.compile(fn,
            isSerialized() ? CompilationPhases.COMPILE_ALL_SERIALIZED : CompilationPhases.COMPILE_ALL);

    if (persist && !compiledFn.getFlag(FunctionNode.HAS_APPLY_TO_CALL_SPECIALIZATION)) {
        compiler.persistClassInfo(cacheKey, compiledFn);
    }
    return new FunctionInitializer(compiledFn, compiler.getInvalidatedProgramPoints());
}
 

import jdk.nashorn.internal.codegen.Compiler.CompilationPhases; //导入依赖的package包/类
private FunctionInitializer compileTypeSpecialization(final MethodType actualCallSiteType, final ScriptObject runtimeScope, final boolean persist) {
    // We're creating an empty script object for holding local variables. AssignSymbols will populate it with
    // explicit Undefined values for undefined local variables (see AssignSymbols#defineSymbol() and
    // CompilationEnvironment#declareLocalSymbol()).

    if (log.isEnabled()) {
        log.info("Parameter type specialization of '", functionName, "' signature: ", actualCallSiteType);
    }

    final boolean persistentCache = persist && usePersistentCodeCache();
    String cacheKey = null;
    if (persistentCache) {
        final TypeMap typeMap = typeMap(actualCallSiteType);
        final Type[] paramTypes = typeMap == null ? null : typeMap.getParameterTypes(functionNodeId);
        cacheKey = CodeStore.getCacheKey(functionNodeId, paramTypes);
        final CodeInstaller newInstaller = getInstallerForNewCode();
        final StoredScript script = newInstaller.loadScript(source, cacheKey);

        if (script != null) {
            Compiler.updateCompilationId(script.getCompilationId());
            return script.installFunction(this, newInstaller);
        }
    }

    final FunctionNode fn = reparse();
    final Compiler compiler = getCompiler(fn, actualCallSiteType, runtimeScope);
    final FunctionNode compiledFn = compiler.compile(fn,
            fn.isCached() ? CompilationPhases.COMPILE_ALL_CACHED : CompilationPhases.COMPILE_ALL);

    if (persist && !compiledFn.hasApplyToCallSpecialization()) {
        compiler.persistClassInfo(cacheKey, compiledFn);
    }
    return new FunctionInitializer(compiledFn, compiler.getInvalidatedProgramPoints());
}
 

import jdk.nashorn.internal.codegen.Compiler.CompilationPhases; //导入依赖的package包/类
private CompileUnit createCompileUnit(final CompileUnit oldUnit, final Set<CompileUnit> unitSet,
        final Map<CompileUnit, CompileUnit> unitMap, final Compiler compiler, final CompilationPhases phases) {
    final CompileUnit newUnit = createNewCompileUnit(compiler, phases);
    unitMap.put(oldUnit, newUnit);
    unitSet.add(newUnit);
    return newUnit;
}
 

import jdk.nashorn.internal.codegen.Compiler.CompilationPhases; //导入依赖的package包/类
private static CompileUnit createNewCompileUnit(final Compiler compiler, final CompilationPhases phases) {
    final StringBuilder sb = new StringBuilder(compiler.nextCompileUnitName());
    if (phases.isRestOfCompilation()) {
        sb.append("$restOf");
    }
    //it's ok to not copy the initCount, methodCount and clinitCount here, as codegen is what
    //fills those out anyway. Thus no need for a copy constructor
    return compiler.createCompileUnit(sb.toString(), 0);
}
 

import jdk.nashorn.internal.codegen.Compiler.CompilationPhases; //导入依赖的package包/类
private FunctionInitializer compileTypeSpecialization(final MethodType actualCallSiteType, final ScriptObject runtimeScope, final boolean persist) {
    // We're creating an empty script object for holding local variables. AssignSymbols will populate it with
    // explicit Undefined values for undefined local variables (see AssignSymbols#defineSymbol() and
    // CompilationEnvironment#declareLocalSymbol()).

    if (log.isEnabled()) {
        log.info("Parameter type specialization of '", functionName, "' signature: ", actualCallSiteType);
    }

    final boolean persistentCache = persist && usePersistentCodeCache();
    String cacheKey = null;
    if (persistentCache) {
        final TypeMap typeMap = typeMap(actualCallSiteType);
        final Type[] paramTypes = typeMap == null ? null : typeMap.getParameterTypes(functionNodeId);
        cacheKey = CodeStore.getCacheKey(functionNodeId, paramTypes);
        final CodeInstaller<ScriptEnvironment> newInstaller = getInstallerForNewCode();
        final StoredScript script = newInstaller.loadScript(source, cacheKey);

        if (script != null) {
            Compiler.updateCompilationId(script.getCompilationId());
            return script.installFunction(this, newInstaller);
        }
    }

    final FunctionNode fn = reparse();
    final Compiler compiler = getCompiler(fn, actualCallSiteType, runtimeScope);
    final FunctionNode compiledFn = compiler.compile(fn,
            isSerialized() ? CompilationPhases.COMPILE_ALL_SERIALIZED : CompilationPhases.COMPILE_ALL);

    if (persist && !compiledFn.getFlag(FunctionNode.HAS_APPLY_TO_CALL_SPECIALIZATION)) {
        compiler.persistClassInfo(cacheKey, compiledFn);
    }
    return new FunctionInitializer(compiledFn, compiler.getInvalidatedProgramPoints());
}
 

import jdk.nashorn.internal.codegen.Compiler.CompilationPhases; //导入依赖的package包/类
private synchronized Class<?> compile(final Source source, final ErrorManager errMan, final boolean strict) {
    // start with no errors, no warnings.
    errMan.reset();

    Class<?> script = findCachedClass(source);
    if (script != null) {
        final DebugLogger log = getLogger(Compiler.class);
        if (log.isEnabled()) {
            log.fine(new RuntimeEvent<>(Level.INFO, source), "Code cache hit for ", source, " avoiding recompile.");
        }
        return script;
    }

    StoredScript storedScript = null;
    FunctionNode functionNode = null;
    // We only use the code store here if optimistic types are disabled. With optimistic types, initial compilation
    // just creates a thin wrapper, and actual code is stored per function in RecompilableScriptFunctionData.
    final boolean useCodeStore = codeStore != null && !env._parse_only && !env._optimistic_types;
    final String cacheKey = useCodeStore ? CodeStore.getCacheKey(0, null) : null;

    if (useCodeStore) {
        storedScript = codeStore.load(source, cacheKey);
    }

    if (storedScript == null) {
        functionNode = new Parser(env, source, errMan, strict, getLogger(Parser.class)).parse();

        if (errMan.hasErrors()) {
            return null;
        }

        if (env._print_ast || functionNode.getFlag(FunctionNode.IS_PRINT_AST)) {
            getErr().println(new ASTWriter(functionNode));
        }

        if (env._print_parse || functionNode.getFlag(FunctionNode.IS_PRINT_PARSE)) {
            getErr().println(new PrintVisitor(functionNode, true, false));
        }
    }

    if (env._parse_only) {
        return null;
    }

    final URL          url    = source.getURL();
    final ScriptLoader loader = env._loader_per_compile ? createNewLoader() : scriptLoader;
    final CodeSource   cs     = new CodeSource(url, (CodeSigner[])null);
    final CodeInstaller<ScriptEnvironment> installer = new ContextCodeInstaller(this, loader, cs);

    if (storedScript == null) {
        final CompilationPhases phases = Compiler.CompilationPhases.COMPILE_ALL;

        final Compiler compiler = new Compiler(
                this,
                env,
                installer,
                source,
                errMan,
                strict | functionNode.isStrict());

        final FunctionNode compiledFunction = compiler.compile(functionNode, phases);
        if (errMan.hasErrors()) {
            return null;
        }
        script = compiledFunction.getRootClass();
        compiler.persistClassInfo(cacheKey, compiledFunction);
    } else {
        Compiler.updateCompilationId(storedScript.getCompilationId());
        script = install(storedScript, source, installer);
    }

    cacheClass(source, script);
    return script;
}