jdk8-mips64-public/nashorn: src/jdk/nashorn/internal/runtime/Context.java@d0b26e6f602c (annotated)

src/jdk/nashorn/internal/runtime/Context.java@d0b26e6f602c (annotated)

src/jdk/nashorn/internal/runtime/Context.java

Wed, 05 Nov 2014 12:34:06 +0100

author: lagergren
date: Wed, 05 Nov 2014 12:34:06 +0100
changeset 1086: d0b26e6f602c
parent 1062: bf5f28dafa7c
child 1087: a119a11d49d8
permissions: -rw-r--r--

8057825: Bug in apply specialization - if an apply specialization that is available doesn't fit, a new one wouldn't be installed, if the new code generated as a specialization didn't manage to do the apply specialization. Basically changing a conditional to an unconditional.
Reviewed-by: attila, hannesw

 /*
  * Copyright (c) 2010, 2013, Oracle and/or its affiliates. All rights reserved.
  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
  *
  * This code is free software; you can redistribute it and/or modify it
  * under the terms of the GNU General Public License version 2 only, as
  * published by the Free Software Foundation.  Oracle designates this
  * particular file as subject to the "Classpath" exception as provided
  * by Oracle in the LICENSE file that accompanied this code.
  *
  * This code is distributed in the hope that it will be useful, but WITHOUT
  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  * version 2 for more details (a copy is included in the LICENSE file that
  * accompanied this code).
  *
  * You should have received a copy of the GNU General Public License version
  * 2 along with this work; if not, write to the Free Software Foundation,
  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
  *
  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
  * or visit www.oracle.com if you need additional information or have any
  * questions.
  */
 package jdk.nashorn.internal.runtime;
 import static jdk.nashorn.internal.codegen.CompilerConstants.CONSTANTS;
 import static jdk.nashorn.internal.codegen.CompilerConstants.CREATE_PROGRAM_FUNCTION;
 import static jdk.nashorn.internal.codegen.CompilerConstants.SOURCE;
 import static jdk.nashorn.internal.codegen.CompilerConstants.STRICT_MODE;
 import static jdk.nashorn.internal.runtime.CodeStore.newCodeStore;
 import static jdk.nashorn.internal.runtime.ECMAErrors.typeError;
 import static jdk.nashorn.internal.runtime.ScriptRuntime.UNDEFINED;
 import static jdk.nashorn.internal.runtime.Source.sourceFor;
 import java.io.File;
 import java.io.IOException;
 import java.io.PrintWriter;
 import java.lang.invoke.MethodHandle;
 import java.lang.invoke.MethodHandles;
 import java.lang.invoke.MethodType;
 import java.lang.invoke.SwitchPoint;
 import java.lang.ref.ReferenceQueue;
 import java.lang.ref.SoftReference;
 import java.lang.reflect.Field;
 import java.lang.reflect.Modifier;
 import java.net.MalformedURLException;
 import java.net.URL;
 import java.security.AccessControlContext;
 import java.security.AccessController;
 import java.security.CodeSigner;
 import java.security.CodeSource;
 import java.security.Permissions;
 import java.security.PrivilegedAction;
 import java.security.PrivilegedActionException;
 import java.security.PrivilegedExceptionAction;
 import java.security.ProtectionDomain;
 import java.util.Collection;
 import java.util.HashMap;
 import java.util.LinkedHashMap;
 import java.util.Map;
 import java.util.concurrent.atomic.AtomicLong;
 import java.util.function.Consumer;
 import java.util.function.Supplier;
 import java.util.logging.Level;
 import javax.script.ScriptEngine;
 import jdk.internal.org.objectweb.asm.ClassReader;
 import jdk.internal.org.objectweb.asm.util.CheckClassAdapter;
 import jdk.nashorn.api.scripting.ClassFilter;
 import jdk.nashorn.api.scripting.ScriptObjectMirror;
 import jdk.nashorn.internal.codegen.Compiler;
 import jdk.nashorn.internal.codegen.Compiler.CompilationPhases;
 import jdk.nashorn.internal.codegen.ObjectClassGenerator;
 import jdk.nashorn.internal.ir.FunctionNode;
 import jdk.nashorn.internal.ir.debug.ASTWriter;
 import jdk.nashorn.internal.ir.debug.PrintVisitor;
 import jdk.nashorn.internal.lookup.MethodHandleFactory;
 import jdk.nashorn.internal.objects.Global;
 import jdk.nashorn.internal.parser.Parser;
 import jdk.nashorn.internal.runtime.events.RuntimeEvent;
 import jdk.nashorn.internal.runtime.logging.DebugLogger;
 import jdk.nashorn.internal.runtime.logging.Loggable;
 import jdk.nashorn.internal.runtime.logging.Logger;
 import jdk.nashorn.internal.runtime.options.LoggingOption.LoggerInfo;
 import jdk.nashorn.internal.runtime.options.Options;
 /**
  * This class manages the global state of execution. Context is immutable.
  */
 public final class Context {
     // nashorn specific security runtime access permission names
     /**
      * Permission needed to pass arbitrary nashorn command line options when creating Context.
      */
     public static final String NASHORN_SET_CONFIG      = "nashorn.setConfig";
     /**
      * Permission needed to create Nashorn Context instance.
      */
     public static final String NASHORN_CREATE_CONTEXT  = "nashorn.createContext";
     /**
      * Permission needed to create Nashorn Global instance.
      */
     public static final String NASHORN_CREATE_GLOBAL   = "nashorn.createGlobal";
     /**
      * Permission to get current Nashorn Context from thread local storage.
      */
     public static final String NASHORN_GET_CONTEXT     = "nashorn.getContext";
     /**
      * Permission to use Java reflection/jsr292 from script code.
      */
     public static final String NASHORN_JAVA_REFLECTION = "nashorn.JavaReflection";
     /**
      * Permission to enable nashorn debug mode.
      */
     public static final String NASHORN_DEBUG_MODE = "nashorn.debugMode";
     // nashorn load psuedo URL prefixes
     private static final String LOAD_CLASSPATH = "classpath:";
     private static final String LOAD_FX = "fx:";
     private static final String LOAD_NASHORN = "nashorn:";
     private static MethodHandles.Lookup LOOKUP = MethodHandles.lookup();
     private static MethodType CREATE_PROGRAM_FUNCTION_TYPE = MethodType.methodType(ScriptFunction.class, ScriptObject.class);
     /**
      * Keeps track of which builtin prototypes and properties have been relinked
      * Currently we are conservative and associate the name of a builtin class with all
      * its properties, so it's enough to invalidate a property to break all assumptions
      * about a prototype. This can be changed to a more fine grained approach, but no one
      * ever needs this, given the very rare occurance of swapping out only parts of
      * a builtin v.s. the entire builtin object
      */
     private final Map<String, SwitchPoint> builtinSwitchPoints = new HashMap<>();
     /* Force DebuggerSupport to be loaded. */
     static {
         DebuggerSupport.FORCELOAD = true;
     }
     /**
      * ContextCodeInstaller that has the privilege of installing classes in the Context.
      * Can only be instantiated from inside the context and is opaque to other classes
      */
     public static class ContextCodeInstaller implements CodeInstaller<ScriptEnvironment> {
         private final Context      context;
         private final ScriptLoader loader;
         private final CodeSource   codeSource;
         private int usageCount = 0;
         private int bytesDefined = 0;
         // We reuse this installer for 10 compilations or 200000 defined bytes. Usually the first condition
         // will occur much earlier, the second is a safety measure for very large scripts/functions.
         private final static int MAX_USAGES = 10;
         private final static int MAX_BYTES_DEFINED = 200_000;
         private ContextCodeInstaller(final Context context, final ScriptLoader loader, final CodeSource codeSource) {
             this.context    = context;
             this.loader     = loader;
             this.codeSource = codeSource;
         }
         /**
          * Return the script environment for this installer
          * @return ScriptEnvironment
          */
         @Override
         public ScriptEnvironment getOwner() {
             return context.env;
         }
         @Override
         public Class<?> install(final String className, final byte[] bytecode) {
             usageCount++;
             bytesDefined += bytecode.length;
             final String   binaryName = Compiler.binaryName(className);
             return loader.installClass(binaryName, bytecode, codeSource);
         }
         @Override
         public void initialize(final Collection<Class<?>> classes, final Source source, final Object[] constants) {
             try {
                 AccessController.doPrivileged(new PrivilegedExceptionAction<Void>() {
                     @Override
                     public Void run() throws Exception {
                         for (final Class<?> clazz : classes) {
                             //use reflection to write source and constants table to installed classes
                             final Field sourceField = clazz.getDeclaredField(SOURCE.symbolName());
                             sourceField.setAccessible(true);
                             sourceField.set(null, source);
                             final Field constantsField = clazz.getDeclaredField(CONSTANTS.symbolName());
                             constantsField.setAccessible(true);
                             constantsField.set(null, constants);
                         }
                         return null;
                     }
                 });
             } catch (final PrivilegedActionException e) {
                 throw new RuntimeException(e);
             }
         }
         @Override
         public void verify(final byte[] code) {
             context.verify(code);
         }
         @Override
         public long getUniqueScriptId() {
             return context.getUniqueScriptId();
         }
         @Override
         public void storeScript(final String cacheKey, final Source source, final String mainClassName,
                                 final Map<String,byte[]> classBytes, final Map<Integer, FunctionInitializer> initializers,
                                 final Object[] constants, final int compilationId) {
             if (context.codeStore != null) {
                 context.codeStore.store(cacheKey, source, mainClassName, classBytes, initializers, constants, compilationId);
             }
         }
         @Override
         public StoredScript loadScript(final Source source, final String functionKey) {
             if (context.codeStore != null) {
                 return context.codeStore.load(source, functionKey);
             }
             return null;
         }
         @Override
         public CodeInstaller<ScriptEnvironment> withNewLoader() {
             // Reuse this installer if we're within our limits.
             if (usageCount < MAX_USAGES && bytesDefined < MAX_BYTES_DEFINED) {
                 return this;
             }
             return new ContextCodeInstaller(context, context.createNewLoader(), codeSource);
         }
         @Override
         public boolean isCompatibleWith(final CodeInstaller<ScriptEnvironment> other) {
             if (other instanceof ContextCodeInstaller) {
                 final ContextCodeInstaller cci = (ContextCodeInstaller)other;
                 return cci.context == context && cci.codeSource == codeSource;
             }
             return false;
         }
     }
     /** Is Context global debug mode enabled ? */
     public static final boolean DEBUG = Options.getBooleanProperty("nashorn.debug");
     private static final ThreadLocal<Global> currentGlobal = new ThreadLocal<>();
     // in-memory cache for loaded classes
     private ClassCache classCache;
     // persistent code store
     private CodeStore codeStore;
     /**
      * Get the current global scope
      * @return the current global scope
      */
     public static Global getGlobal() {
         // This class in a package.access protected package.
         // Trusted code only can call this method.
         return currentGlobal.get();
     }
     /**
      * Set the current global scope
      * @param global the global scope
      */
     public static void setGlobal(final ScriptObject global) {
         if (global != null && !(global instanceof Global)) {
             throw new IllegalArgumentException("not a global!");
         }
         setGlobal((Global)global);
     }
     /**
      * Set the current global scope
      * @param global the global scope
      */
     public static void setGlobal(final Global global) {
         // This class in a package.access protected package.
         // Trusted code only can call this method.
         assert getGlobal() != global;
         //same code can be cached between globals, then we need to invalidate method handle constants
         if (global != null) {
             Global.getConstants().invalidateAll();
         }
         currentGlobal.set(global);
     }
     /**
      * Get context of the current global
      * @return current global scope's context.
      */
     public static Context getContext() {
         final SecurityManager sm = System.getSecurityManager();
         if (sm != null) {
             sm.checkPermission(new RuntimePermission(NASHORN_GET_CONTEXT));
         }
         return getContextTrusted();
     }
     /**
      * Get current context's error writer
      *
      * @return error writer of the current context
      */
     public static PrintWriter getCurrentErr() {
         final ScriptObject global = getGlobal();
         return (global != null)? global.getContext().getErr() : new PrintWriter(System.err);
     }
     /**
      * Output text to this Context's error stream
      * @param str text to write
      */
     public static void err(final String str) {
         err(str, true);
     }
     /**
      * Output text to this Context's error stream, optionally with
      * a newline afterwards
      *
      * @param str  text to write
      * @param crlf write a carriage return/new line after text
      */
     public static void err(final String str, final boolean crlf) {
         final PrintWriter err = Context.getCurrentErr();
         if (err != null) {
             if (crlf) {
                 err.println(str);
             } else {
                 err.print(str);
             }
         }
     }
     /** Current environment. */
     private final ScriptEnvironment env;
     /** is this context in strict mode? Cached from env. as this is used heavily. */
     final boolean _strict;
     /** class loader to resolve classes from script. */
     private final ClassLoader  appLoader;
     /** Class loader to load classes from -classpath option, if set. */
     private final ClassLoader  classPathLoader;
     /** Class loader to load classes compiled from scripts. */
     private final ScriptLoader scriptLoader;
     /** Current error manager. */
     private final ErrorManager errors;
     /** Unique id for script. Used only when --loader-per-compile=false */
     private final AtomicLong uniqueScriptId;
     /** Optional class filter to use for Java classes. Can be null. */
     private final ClassFilter classFilter;
     private static final ClassLoader myLoader = Context.class.getClassLoader();
     private static final StructureLoader sharedLoader;
     /*package-private*/ @SuppressWarnings("static-method")
     ClassLoader getSharedLoader() {
         return sharedLoader;
     }
     private static AccessControlContext createNoPermAccCtxt() {
         return new AccessControlContext(new ProtectionDomain[] { new ProtectionDomain(null, new Permissions()) });
     }
     private static AccessControlContext createPermAccCtxt(final String permName) {
         final Permissions perms = new Permissions();
         perms.add(new RuntimePermission(permName));
         return new AccessControlContext(new ProtectionDomain[] { new ProtectionDomain(null, perms) });
     }
     private static final AccessControlContext NO_PERMISSIONS_ACC_CTXT = createNoPermAccCtxt();
     private static final AccessControlContext CREATE_LOADER_ACC_CTXT  = createPermAccCtxt("createClassLoader");
     private static final AccessControlContext CREATE_GLOBAL_ACC_CTXT  = createPermAccCtxt(NASHORN_CREATE_GLOBAL);
     static {
         sharedLoader = AccessController.doPrivileged(new PrivilegedAction<StructureLoader>() {
             @Override
             public StructureLoader run() {
                 return new StructureLoader(myLoader);
             }
         }, CREATE_LOADER_ACC_CTXT);
     }
     /**
      * ThrowErrorManager that throws ParserException upon error conditions.
      */
     public static class ThrowErrorManager extends ErrorManager {
         @Override
         public void error(final String message) {
             throw new ParserException(message);
         }
         @Override
         public void error(final ParserException e) {
             throw e;
         }
     }
     /**
      * Constructor
      *
      * @param options options from command line or Context creator
      * @param errors  error manger
      * @param appLoader application class loader
      */
     public Context(final Options options, final ErrorManager errors, final ClassLoader appLoader) {
         this(options, errors, appLoader, (ClassFilter)null);
     }
     /**
      * Constructor
      *
      * @param options options from command line or Context creator
      * @param errors  error manger
      * @param appLoader application class loader
      * @param classFilter class filter to use
      */
     public Context(final Options options, final ErrorManager errors, final ClassLoader appLoader, final ClassFilter classFilter) {
         this(options, errors, new PrintWriter(System.out, true), new PrintWriter(System.err, true), appLoader, classFilter);
     }
     /**
      * Constructor
      *
      * @param options options from command line or Context creator
      * @param errors  error manger
      * @param out     output writer for this Context
      * @param err     error writer for this Context
      * @param appLoader application class loader
      */
     public Context(final Options options, final ErrorManager errors, final PrintWriter out, final PrintWriter err, final ClassLoader appLoader) {
         this(options, errors, out, err, appLoader, (ClassFilter)null);
     }
     /**
      * Constructor
      *
      * @param options options from command line or Context creator
      * @param errors  error manger
      * @param out     output writer for this Context
      * @param err     error writer for this Context
      * @param appLoader application class loader
      * @param classFilter class filter to use
      */
     public Context(final Options options, final ErrorManager errors, final PrintWriter out, final PrintWriter err, final ClassLoader appLoader, final ClassFilter classFilter) {
         final SecurityManager sm = System.getSecurityManager();
         if (sm != null) {
             sm.checkPermission(new RuntimePermission(NASHORN_CREATE_CONTEXT));
         }
         this.classFilter = classFilter;
         this.env       = new ScriptEnvironment(options, out, err);
         this._strict   = env._strict;
         this.appLoader = appLoader;
         if (env._loader_per_compile) {
             this.scriptLoader = null;
             this.uniqueScriptId = null;
         } else {
             this.scriptLoader = createNewLoader();
             this.uniqueScriptId = new AtomicLong();
         }
         this.errors    = errors;
         // if user passed -classpath option, make a class loader with that and set it as
         // thread context class loader so that script can access classes from that path.
         final String classPath = options.getString("classpath");
         if (!env._compile_only && classPath != null && !classPath.isEmpty()) {
             // make sure that caller can create a class loader.
             if (sm != null) {
                 sm.checkPermission(new RuntimePermission("createClassLoader"));
             }
             this.classPathLoader = NashornLoader.createClassLoader(classPath);
         } else {
             this.classPathLoader = null;
         }
         final int cacheSize = env._class_cache_size;
         if (cacheSize > 0) {
             classCache = new ClassCache(cacheSize);
         }
         if (env._persistent_cache) {
             try {
                 codeStore = newCodeStore(this);
             } catch (final IOException e) {
                 throw new RuntimeException("Error initializing code cache", e);
             }
         }
         // print version info if asked.
         if (env._version) {
             getErr().println("nashorn " + Version.version());
         }
         if (env._fullversion) {
             getErr().println("nashorn full version " + Version.fullVersion());
         }
         initLoggers();
     }
     /**
      * Get the class filter for this context
      * @return class filter
      */
     public ClassFilter getClassFilter() {
         return classFilter;
     }
     /**
      * Get the error manager for this context
      * @return error manger
      */
     public ErrorManager getErrorManager() {
         return errors;
     }
     /**
      * Get the script environment for this context
      * @return script environment
      */
     public ScriptEnvironment getEnv() {
         return env;
     }
     /**
      * Get the output stream for this context
      * @return output print writer
      */
     public PrintWriter getOut() {
         return env.getOut();
     }
     /**
      * Get the error stream for this context
      * @return error print writer
      */
     public PrintWriter getErr() {
         return env.getErr();
     }
     /**
      * Get the PropertyMap of the current global scope
      * @return the property map of the current global scope
      */
     public static PropertyMap getGlobalMap() {
         return Context.getGlobal().getMap();
     }
     /**
      * Compile a top level script.
      *
      * @param source the source
      * @param scope  the scope
      *
      * @return top level function for script
      */
     public ScriptFunction compileScript(final Source source, final ScriptObject scope) {
         return compileScript(source, scope, this.errors);
     }
     /**
      * Interface to represent compiled code that can be re-used across many
      * global scope instances
      */
     public static interface MultiGlobalCompiledScript {
         /**
          * Obtain script function object for a specific global scope object.
          *
          * @param newGlobal global scope for which function object is obtained
          * @return script function for script level expressions
          */
         public ScriptFunction getFunction(final Global newGlobal);
     }
     /**
      * Compile a top level script.
      *
      * @param source the script source
      * @return reusable compiled script across many global scopes.
      */
     public MultiGlobalCompiledScript compileScript(final Source source) {
         final Class<?> clazz = compile(source, this.errors, this._strict);
         final MethodHandle createProgramFunctionHandle = getCreateProgramFunctionHandle(clazz);
         return new MultiGlobalCompiledScript() {
             @Override
             public ScriptFunction getFunction(final Global newGlobal) {
                 return invokeCreateProgramFunctionHandle(createProgramFunctionHandle, newGlobal);
             }
         };
     }
     /**
      * Entry point for {@code eval}
      *
      * @param initialScope The scope of this eval call
      * @param string       Evaluated code as a String
      * @param callThis     "this" to be passed to the evaluated code
      * @param location     location of the eval call
      * @param strict       is this {@code eval} call from a strict mode code?
      * @return the return value of the {@code eval}
      */
     public Object eval(final ScriptObject initialScope, final String string,
             final Object callThis, final Object location, final boolean strict) {
         return eval(initialScope, string, callThis, location, strict, false);
     }
     /**
      * Entry point for {@code eval}
      *
      * @param initialScope The scope of this eval call
      * @param string       Evaluated code as a String
      * @param callThis     "this" to be passed to the evaluated code
      * @param location     location of the eval call
      * @param strict       is this {@code eval} call from a strict mode code?
      * @param evalCall     is this called from "eval" builtin?
      *
      * @return the return value of the {@code eval}
      */
     public Object eval(final ScriptObject initialScope, final String string,
             final Object callThis, final Object location, final boolean strict, final boolean evalCall) {
         final String  file       = location == UNDEFINED || location == null ? "<eval>" : location.toString();
         final Source  source     = sourceFor(file, string, evalCall);
         final boolean directEval = location != UNDEFINED; // is this direct 'eval' call or indirectly invoked eval?
         final Global  global = Context.getGlobal();
         ScriptObject scope = initialScope;
         // ECMA section 10.1.1 point 2 says eval code is strict if it begins
         // with "use strict" directive or eval direct call itself is made
         // from from strict mode code. We are passed with caller's strict mode.
         boolean strictFlag = directEval && strict;
         Class<?> clazz = null;
         try {
             clazz = compile(source, new ThrowErrorManager(), strictFlag);
         } catch (final ParserException e) {
             e.throwAsEcmaException(global);
             return null;
         }
         if (!strictFlag) {
             // We need to get strict mode flag from compiled class. This is
             // because eval code may start with "use strict" directive.
             try {
                 strictFlag = clazz.getField(STRICT_MODE.symbolName()).getBoolean(null);
             } catch (final NoSuchFieldException | SecurityException | IllegalArgumentException | IllegalAccessException e) {
                 //ignored
                 strictFlag = false;
             }
         }
         // In strict mode, eval does not instantiate variables and functions
         // in the caller's environment. A new environment is created!
         if (strictFlag) {
             // Create a new scope object
             final ScriptObject strictEvalScope = global.newObject();
             // bless it as a "scope"
             strictEvalScope.setIsScope();
             // set given scope to be it's proto so that eval can still
             // access caller environment vars in the new environment.
             strictEvalScope.setProto(scope);
             scope = strictEvalScope;
         }
         final ScriptFunction func = getProgramFunction(clazz, scope);
         Object evalThis;
         if (directEval) {
             evalThis = callThis instanceof ScriptObject || strictFlag ? callThis : global;
         } else {
             evalThis = global;
         }
         return ScriptRuntime.apply(func, evalThis);
     }
     private static Source loadInternal(final String srcStr, final String prefix, final String resourcePath) {
         if (srcStr.startsWith(prefix)) {
             final String resource = resourcePath + srcStr.substring(prefix.length());
             // NOTE: even sandbox scripts should be able to load scripts in nashorn: scheme
             // These scripts are always available and are loaded from nashorn.jar's resources.
             return AccessController.doPrivileged(
                     new PrivilegedAction<Source>() {
                         @Override
                         public Source run() {
                             try {
                                 final URL resURL = Context.class.getResource(resource);
                                 return resURL != null ? sourceFor(srcStr, resURL) : null;
                             } catch (final IOException exp) {
                                 return null;
                             }
                         }
                     });
         }
         return null;
     }
     /**
      * Implementation of {@code load} Nashorn extension. Load a script file from a source
      * expression
      *
      * @param scope  the scope
      * @param from   source expression for script
      *
      * @return return value for load call (undefined)
      *
      * @throws IOException if source cannot be found or loaded
      */
     public Object load(final ScriptObject scope, final Object from) throws IOException {
         final Object src = from instanceof ConsString ? from.toString() : from;
         Source source = null;
         // load accepts a String (which could be a URL or a file name), a File, a URL
         // or a ScriptObject that has "name" and "source" (string valued) properties.
         if (src instanceof String) {
             final String srcStr = (String)src;
             if (srcStr.startsWith(LOAD_CLASSPATH)) {
                 final URL url = getResourceURL(srcStr.substring(LOAD_CLASSPATH.length()));
                 source = url != null ? sourceFor(url.toString(), url) : null;
             } else {
                 final File file = new File(srcStr);
                 if (srcStr.indexOf(':') != -1) {
                     if ((source = loadInternal(srcStr, LOAD_NASHORN, "resources/")) == null &&
                         (source = loadInternal(srcStr, LOAD_FX, "resources/fx/")) == null) {
                         URL url;
                         try {
                             //check for malformed url. if malformed, it may still be a valid file
                             url = new URL(srcStr);
                         } catch (final MalformedURLException e) {
                             url = file.toURI().toURL();
                         }
                         source = sourceFor(url.toString(), url);
                     }
                 } else if (file.isFile()) {
                     source = sourceFor(srcStr, file);
                 }
             }
         } else if (src instanceof File && ((File)src).isFile()) {
             final File file = (File)src;
             source = sourceFor(file.getName(), file);
         } else if (src instanceof URL) {
             final URL url = (URL)src;
             source = sourceFor(url.toString(), url);
         } else if (src instanceof ScriptObject) {
             final ScriptObject sobj = (ScriptObject)src;
             if (sobj.has("script") && sobj.has("name")) {
                 final String script = JSType.toString(sobj.get("script"));
                 final String name   = JSType.toString(sobj.get("name"));
                 source = sourceFor(name, script);
             }
         } else if (src instanceof Map) {
             final Map<?,?> map = (Map<?,?>)src;
             if (map.containsKey("script") && map.containsKey("name")) {
                 final String script = JSType.toString(map.get("script"));
                 final String name   = JSType.toString(map.get("name"));
                 source = sourceFor(name, script);
             }
         }
         if (source != null) {
             return evaluateSource(source, scope, scope);
         }
         throw typeError("cant.load.script", ScriptRuntime.safeToString(from));
     }
     /**
      * Implementation of {@code loadWithNewGlobal} Nashorn extension. Load a script file from a source
      * expression, after creating a new global scope.
      *
      * @param from source expression for script
      * @param args (optional) arguments to be passed to the loaded script
      *
      * @return return value for load call (undefined)
      *
      * @throws IOException if source cannot be found or loaded
      */
     public Object loadWithNewGlobal(final Object from, final Object...args) throws IOException {
         final Global oldGlobal = getGlobal();
         final Global newGlobal = AccessController.doPrivileged(new PrivilegedAction<Global>() {
            @Override
            public Global run() {
                try {
                    return newGlobal();
                } catch (final RuntimeException e) {
                    if (Context.DEBUG) {
                        e.printStackTrace();
                    }
                    throw e;
                }
            }
         }, CREATE_GLOBAL_ACC_CTXT);
         // initialize newly created Global instance
         initGlobal(newGlobal);
         setGlobal(newGlobal);
         final Object[] wrapped = args == null? ScriptRuntime.EMPTY_ARRAY :  ScriptObjectMirror.wrapArray(args, oldGlobal);
         newGlobal.put("arguments", newGlobal.wrapAsObject(wrapped), env._strict);
         try {
             // wrap objects from newGlobal's world as mirrors - but if result
             // is from oldGlobal's world, unwrap it!
             return ScriptObjectMirror.unwrap(ScriptObjectMirror.wrap(load(newGlobal, from), newGlobal), oldGlobal);
         } finally {
             setGlobal(oldGlobal);
         }
     }
     /**
      * Load or get a structure class. Structure class names are based on the number of parameter fields
      * and {@link AccessorProperty} fields in them. Structure classes are used to represent ScriptObjects
      *
      * @see ObjectClassGenerator
      * @see AccessorProperty
      * @see ScriptObject
      *
      * @param fullName  full name of class, e.g. jdk.nashorn.internal.objects.JO2P1 contains 2 fields and 1 parameter.
      *
      * @return the {@code Class<?>} for this structure
      *
      * @throws ClassNotFoundException if structure class cannot be resolved
      */
     @SuppressWarnings("unchecked")
     public static Class<? extends ScriptObject> forStructureClass(final String fullName) throws ClassNotFoundException {
         if (System.getSecurityManager() != null && !StructureLoader.isStructureClass(fullName)) {
             throw new ClassNotFoundException(fullName);
         }
         return (Class<? extends ScriptObject>)Class.forName(fullName, true, sharedLoader);
     }
     /**
      * Checks that the given Class can be accessed from no permissions context.
      *
      * @param clazz Class object
      * @throws SecurityException if not accessible
      */
     public static void checkPackageAccess(final Class<?> clazz) {
         final SecurityManager sm = System.getSecurityManager();
         if (sm != null) {
             Class<?> bottomClazz = clazz;
             while (bottomClazz.isArray()) {
                 bottomClazz = bottomClazz.getComponentType();
             }
             checkPackageAccess(sm, bottomClazz.getName());
         }
     }
     /**
      * Checks that the given package name can be accessed from no permissions context.
      *
      * @param pkgName package name
      * @throws SecurityException if not accessible
      */
     public static void checkPackageAccess(final String pkgName) {
         final SecurityManager sm = System.getSecurityManager();
         if (sm != null) {
             checkPackageAccess(sm, pkgName.endsWith(".") ? pkgName : pkgName + ".");
         }
     }
     /**
      * Checks that the given package can be accessed from no permissions context.
      *
      * @param sm current security manager instance
      * @param fullName fully qualified package name
      * @throw SecurityException if not accessible
      */
     private static void checkPackageAccess(final SecurityManager sm, final String fullName) {
         sm.getClass(); // null check
         final int index = fullName.lastIndexOf('.');
         if (index != -1) {
             final String pkgName = fullName.substring(0, index);
             AccessController.doPrivileged(new PrivilegedAction<Void>() {
                 @Override
                 public Void run() {
                     sm.checkPackageAccess(pkgName);
                     return null;
                 }
             }, NO_PERMISSIONS_ACC_CTXT);
         }
     }
     /**
      * Checks that the given Class can be accessed from no permissions context.
      *
      * @param clazz Class object
      * @return true if package is accessible, false otherwise
      */
     private static boolean isAccessiblePackage(final Class<?> clazz) {
         try {
             checkPackageAccess(clazz);
             return true;
         } catch (final SecurityException se) {
             return false;
         }
     }
     /**
      * Checks that the given Class is public and it can be accessed from no permissions context.
      *
      * @param clazz Class object to check
      * @return true if Class is accessible, false otherwise
      */
     public static boolean isAccessibleClass(final Class<?> clazz) {
         return Modifier.isPublic(clazz.getModifiers()) && Context.isAccessiblePackage(clazz);
     }
     /**
      * Lookup a Java class. This is used for JSR-223 stuff linking in from
      * {@code jdk.nashorn.internal.objects.NativeJava} and {@code jdk.nashorn.internal.runtime.NativeJavaPackage}
      *
      * @param fullName full name of class to load
      *
      * @return the {@code Class<?>} for the name
      *
      * @throws ClassNotFoundException if class cannot be resolved
      */
     public Class<?> findClass(final String fullName) throws ClassNotFoundException {
         if (fullName.indexOf('[') != -1 || fullName.indexOf('/') != -1) {
             // don't allow array class names or internal names.
             throw new ClassNotFoundException(fullName);
         }
         // give chance to ClassFilter to filter out, if present
         if (classFilter != null && !classFilter.exposeToScripts(fullName)) {
             throw new ClassNotFoundException(fullName);
         }
         // check package access as soon as possible!
         final SecurityManager sm = System.getSecurityManager();
         if (sm != null) {
             checkPackageAccess(sm, fullName);
         }
         // try the script -classpath loader, if that is set
         if (classPathLoader != null) {
             try {
                 return Class.forName(fullName, true, classPathLoader);
             } catch (final ClassNotFoundException ignored) {
                 // ignore, continue search
             }
         }
         // Try finding using the "app" loader.
         return Class.forName(fullName, true, appLoader);
     }
     /**
      * Hook to print stack trace for a {@link Throwable} that occurred during
      * execution
      *
      * @param t throwable for which to dump stack
      */
     public static void printStackTrace(final Throwable t) {
         if (Context.DEBUG) {
             t.printStackTrace(Context.getCurrentErr());
         }
     }
     /**
      * Verify generated bytecode before emission. This is called back from the
      * {@link ObjectClassGenerator} or the {@link Compiler}. If the "--verify-code" parameter
      * hasn't been given, this is a nop
      *
      * Note that verification may load classes -- we don't want to do that unless
      * user specified verify option. We check it here even though caller
      * may have already checked that flag
      *
      * @param bytecode bytecode to verify
      */
     public void verify(final byte[] bytecode) {
         if (env._verify_code) {
             // No verification when security manager is around as verifier
             // may load further classes - which should be avoided.
             if (System.getSecurityManager() == null) {
                 CheckClassAdapter.verify(new ClassReader(bytecode), sharedLoader, false, new PrintWriter(System.err, true));
             }
         }
     }
     /**
      * Create and initialize a new global scope object.
      *
      * @return the initialized global scope object.
      */
     public Global createGlobal() {
         return initGlobal(newGlobal());
     }
     /**
      * Create a new uninitialized global scope object
      * @return the global script object
      */
     public Global newGlobal() {
         return new Global(this);
     }
     /**
      * Initialize given global scope object.
      *
      * @param global the global
      * @param engine the associated ScriptEngine instance, can be null
      * @return the initialized global scope object.
      */
     public Global initGlobal(final Global global, final ScriptEngine engine) {
         // Need only minimal global object, if we are just compiling.
         if (!env._compile_only) {
             final Global oldGlobal = Context.getGlobal();
             try {
                 Context.setGlobal(global);
                 // initialize global scope with builtin global objects
                 global.initBuiltinObjects(engine);
             } finally {
                 Context.setGlobal(oldGlobal);
             }
         }
         return global;
     }
     /**
      * Initialize given global scope object.
      *
      * @param global the global
      * @return the initialized global scope object.
      */
     public Global initGlobal(final Global global) {
         return initGlobal(global, null);
     }
     /**
      * Return the current global's context
      * @return current global's context
      */
     static Context getContextTrusted() {
         return ((ScriptObject)Context.getGlobal()).getContext();
     }
     static Context getContextTrustedOrNull() {
         final Global global = Context.getGlobal();
         return global == null ? null : ((ScriptObject)global).getContext();
     }
     /**
      * Try to infer Context instance from the Class. If we cannot,
      * then get it from the thread local variable.
      *
      * @param clazz the class
      * @return context
      */
     static Context fromClass(final Class<?> clazz) {
         final ClassLoader loader = clazz.getClassLoader();
         if (loader instanceof ScriptLoader) {
             return ((ScriptLoader)loader).getContext();
         }
         return Context.getContextTrusted();
     }
     private URL getResourceURL(final String resName) {
         // try the classPathLoader if we have and then
         // try the appLoader if non-null.
         if (classPathLoader != null) {
             return classPathLoader.getResource(resName);
         } else if (appLoader != null) {
             return appLoader.getResource(resName);
         }
         return null;
     }
     private Object evaluateSource(final Source source, final ScriptObject scope, final ScriptObject thiz) {
         ScriptFunction script = null;
         try {
             script = compileScript(source, scope, new Context.ThrowErrorManager());
         } catch (final ParserException e) {
             e.throwAsEcmaException();
         }
         return ScriptRuntime.apply(script, thiz);
     }
     private static ScriptFunction getProgramFunction(final Class<?> script, final ScriptObject scope) {
         if (script == null) {
             return null;
         }
         return invokeCreateProgramFunctionHandle(getCreateProgramFunctionHandle(script), scope);
     }
     private static MethodHandle getCreateProgramFunctionHandle(final Class<?> script) {
         try {
             return LOOKUP.findStatic(script, CREATE_PROGRAM_FUNCTION.symbolName(), CREATE_PROGRAM_FUNCTION_TYPE);
         } catch (NoSuchMethodException | IllegalAccessException e) {
             throw new AssertionError("Failed to retrieve a handle for the program function for " + script.getName(), e);
         }
     }
     private static ScriptFunction invokeCreateProgramFunctionHandle(final MethodHandle createProgramFunctionHandle, final ScriptObject scope) {
         try {
             return (ScriptFunction)createProgramFunctionHandle.invokeExact(scope);
         } catch (final RuntimeException|Error e) {
             throw e;
         } catch (final Throwable t) {
             throw new AssertionError("Failed to create a program function", t);
         }
     }
     private ScriptFunction compileScript(final Source source, final ScriptObject scope, final ErrorManager errMan) {
         return getProgramFunction(compile(source, errMan, this._strict), scope);
     }
     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,
         // code is stored per function in RecompilableScriptFunctionData.
         // TODO: This should really be triggered by lazy compilation, not optimistic types.
         final boolean useCodeStore = env._persistent_cache && !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;
     }
     private ScriptLoader createNewLoader() {
         return AccessController.doPrivileged(
              new PrivilegedAction<ScriptLoader>() {
                 @Override
                 public ScriptLoader run() {
                     return new ScriptLoader(appLoader, Context.this);
                 }
              }, CREATE_LOADER_ACC_CTXT);
     }
     private long getUniqueScriptId() {
         return uniqueScriptId.getAndIncrement();
     }
     /**
      * Install a previously compiled class from the code cache.
      *
      * @param storedScript cached script containing class bytes and constants
      * @return main script class
      */
     private static Class<?> install(final StoredScript storedScript, final Source source, final CodeInstaller<ScriptEnvironment> installer) {
         final Map<String, Class<?>> installedClasses = new HashMap<>();
         final Map<String, byte[]>   classBytes       = storedScript.getClassBytes();
         final Object[] constants       = storedScript.getConstants();
         final String   mainClassName   = storedScript.getMainClassName();
         final byte[]   mainClassBytes  = classBytes.get(mainClassName);
         final Class<?> mainClass       = installer.install(mainClassName, mainClassBytes);
         final Map<Integer, FunctionInitializer> initializers = storedScript.getInitializers();
         installedClasses.put(mainClassName, mainClass);
         for (final Map.Entry<String, byte[]> entry : classBytes.entrySet()) {
             final String className = entry.getKey();
             if (className.equals(mainClassName)) {
                 continue;
             }
             final byte[] code = entry.getValue();
             installedClasses.put(className, installer.install(className, code));
         }
         installer.initialize(installedClasses.values(), source, constants);
         for (final Object constant : constants) {
             if (constant instanceof RecompilableScriptFunctionData) {
                 final RecompilableScriptFunctionData data = (RecompilableScriptFunctionData) constant;
                 data.initTransients(source, installer);
                 final FunctionInitializer initializer = initializers.get(data.getFunctionNodeId());
                 if (initializer != null) {
                     initializer.setCode(installedClasses.get(initializer.getClassName()));
                     data.initializeCode(initializer);
                 }
             }
         }
         return mainClass;
     }
     /**
      * Cache for compiled script classes.
      */
     @SuppressWarnings("serial")
     private static class ClassCache extends LinkedHashMap<Source, ClassReference> {
         private final int size;
         private final ReferenceQueue<Class<?>> queue;
         ClassCache(final int size) {
             super(size, 0.75f, true);
             this.size = size;
             this.queue = new ReferenceQueue<>();
         }
         void cache(final Source source, final Class<?> clazz) {
             put(source, new ClassReference(clazz, queue, source));
         }
         @Override
         protected boolean removeEldestEntry(final Map.Entry<Source, ClassReference> eldest) {
             return size() > size;
         }
         @Override
         public ClassReference get(final Object key) {
             for (ClassReference ref; (ref = (ClassReference)queue.poll()) != null; ) {
                 remove(ref.source);
             }
             return super.get(key);
         }
     }
     private static class ClassReference extends SoftReference<Class<?>> {
         private final Source source;
         ClassReference(final Class<?> clazz, final ReferenceQueue<Class<?>> queue, final Source source) {
             super(clazz, queue);
             this.source = source;
         }
     }
     // Class cache management
     private Class<?> findCachedClass(final Source source) {
         final ClassReference ref = classCache == null ? null : classCache.get(source);
         return ref != null ? ref.get() : null;
     }
     private void cacheClass(final Source source, final Class<?> clazz) {
         if (classCache != null) {
             classCache.cache(source, clazz);
         }
     }
     // logging
     private final Map<String, DebugLogger> loggers = new HashMap<>();
     private void initLoggers() {
         ((Loggable)MethodHandleFactory.getFunctionality()).initLogger(this);
     }
     /**
      * Get a logger, given a loggable class
      * @param clazz a Loggable class
      * @return debuglogger associated with that class
      */
     public DebugLogger getLogger(final Class<? extends Loggable> clazz) {
         return getLogger(clazz, null);
     }
     /**
      * Get a logger, given a loggable class
      * @param clazz a Loggable class
      * @param initHook an init hook - if this is the first time the logger is created in the context, run the init hook
      * @return debuglogger associated with that class
      */
     public DebugLogger getLogger(final Class<? extends Loggable> clazz, final Consumer<DebugLogger> initHook) {
         final String name = getLoggerName(clazz);
         DebugLogger logger = loggers.get(name);
         if (logger == null) {
             if (!env.hasLogger(name)) {
                 return DebugLogger.DISABLED_LOGGER;
             }
             final LoggerInfo info = env._loggers.get(name);
             logger = new DebugLogger(name, info.getLevel(), info.isQuiet());
             if (initHook != null) {
                 initHook.accept(logger);
             }
             loggers.put(name, logger);
         }
         return logger;
     }
     /**
      * Given a Loggable class, weave debug info info a method handle for that logger.
      * Level.INFO is used
      *
      * @param clazz loggable
      * @param mh    method handle
      * @param text  debug printout to add
      *
      * @return instrumented method handle, or null if logger not enabled
      */
     public MethodHandle addLoggingToHandle(final Class<? extends Loggable> clazz, final MethodHandle mh, final Supplier<String> text) {
         return addLoggingToHandle(clazz, Level.INFO, mh, Integer.MAX_VALUE, false, text);
     }
     /**
      * Given a Loggable class, weave debug info info a method handle for that logger.
      *
      * @param clazz            loggable
      * @param level            log level
      * @param mh               method handle
      * @param paramStart       first parameter to print
      * @param printReturnValue should we print the return vaulue?
      * @param text             debug printout to add
      *
      * @return instrumented method handle, or null if logger not enabled
      */
     public MethodHandle addLoggingToHandle(final Class<? extends Loggable> clazz, final Level level, final MethodHandle mh, final int paramStart, final boolean printReturnValue, final Supplier<String> text) {
         final DebugLogger log = getLogger(clazz);
         if (log.isEnabled()) {
             return MethodHandleFactory.addDebugPrintout(log, level, mh, paramStart, printReturnValue, text.get());
         }
         return mh;
     }
     private static String getLoggerName(final Class<?> clazz) {
         Class<?> current = clazz;
         while (current != null) {
             final Logger log = current.getAnnotation(Logger.class);
             if (log != null) {
                 assert !"".equals(log.name());
                 return log.name();
             }
             current = current.getSuperclass();
         }
         assert false;
         return null;
     }
     /**
      * This is a special kind of switchpoint used to guard builtin
      * properties and prototypes. In the future it might contain
      * logic to e.g. multiple switchpoint classes.
      */
     public static final class BuiltinSwitchPoint extends SwitchPoint {
         //empty
     }
     /**
      * Create a new builtin switchpoint and return it
      * @param name key name
      * @return new builtin switchpoint
      */
     public SwitchPoint newBuiltinSwitchPoint(final String name) {
         assert builtinSwitchPoints.get(name) == null;
         final SwitchPoint sp = new BuiltinSwitchPoint();
         builtinSwitchPoints.put(name, sp);
         return sp;
     }
     /**
      * Return the builtin switchpoint for a particular key name
      * @param name key name
      * @return builtin switchpoint or null if none
      */
     public SwitchPoint getBuiltinSwitchPoint(final String name) {
         return builtinSwitchPoints.get(name);
     }
 }

Mercurial > jdk8-mips64-public > nashorn / annotate

src/jdk/nashorn/internal/runtime/Context.java@d0b26e6f602c (annotated)

src/jdk/nashorn/internal/runtime/Context.java