jdk8-mips64-public/nashorn: src/jdk/nashorn/internal/runtime/ScriptingFunctions.java@43e32b36153c (annotated)

src/jdk/nashorn/internal/runtime/ScriptingFunctions.java@43e32b36153c (annotated)

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

Thu, 14 Feb 2013 13:01:52 +0100

author: lagergren
date: Thu, 14 Feb 2013 13:01:52 +0100
changeset 89: 43e32b36153c
parent 82: abea4ba28901
child 108: a971adb68f38
permissions: -rw-r--r--

8008199: Lazy compilation and trampoline implementation
Summary: The code pipeline now supports lazy compilation, which can be used to only compile certain FunctionNodes and leave others be, saving startup time. When these uncompiled nodes are hit, a trampoline will force them to be recompiled. This can also be used to specialize compilation fixing parameter types and return types to a callsite specific compilation. This will give performance.
Reviewed-by: attila, sundar

 /*
  * 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.runtime.ECMAErrors.typeError;
 import static jdk.nashorn.internal.runtime.ScriptRuntime.UNDEFINED;
 import static jdk.nashorn.internal.runtime.linker.Lookup.MH;
 import java.io.BufferedReader;
 import java.io.File;
 import java.io.IOException;
 import java.io.InputStream;
 import java.io.InputStreamReader;
 import java.io.OutputStream;
 import java.lang.invoke.MethodHandle;
 import java.lang.invoke.MethodHandles;
 import java.util.Map;
 import java.util.StringTokenizer;
 /**
  * Global functions supported only in scripting mode.
  */
 public final class ScriptingFunctions {
     /** Handle to implementation of {@link ScriptingFunctions#readLine} - Nashorn extension */
     public static final MethodHandle READLINE = findOwnMH("readLine", Object.class, Object.class);
     /** Handle to implementation of {@link ScriptingFunctions#readFully} - Nashorn extension */
     public static final MethodHandle READFULLY = findOwnMH("readFully",     Object.class, Object.class, Object.class);
     /** Handle to implementation of {@link ScriptingFunctions#exec} - Nashorn extension */
     public static final MethodHandle EXEC = findOwnMH("exec",     Object.class, Object.class, Object.class, Object.class);
     /** EXEC name - special property used by $EXEC API. */
     public static final String EXEC_NAME = "$EXEC";
     /** OUT name - special property used by $EXEC API. */
     public static final String OUT_NAME  = "$OUT";
     /** ERR name - special property used by $EXEC API. */
     public static final String ERR_NAME  = "$ERR";
     /** EXIT name - special property used by $EXEC API. */
     public static final String EXIT_NAME = "$EXIT";
     /** Names of special properties used by $ENV API. */
     public  static final String ENV_NAME  = "$ENV";
     private static final String PWD_NAME  = "PWD";
     private ScriptingFunctions() {
     }
     /**
      * Nashorn extension: global.readLine (scripting-mode-only)
      * Read one line of input from the standard input.
      *
      * @param self self reference
      *
      * @return line that was read
      *
      * @throws IOException if an exception occurs
      */
     public static Object readLine(final Object self) throws IOException {
         final BufferedReader reader = new BufferedReader(new InputStreamReader(System.in));
         return reader.readLine();
     }
     /**
      * Nashorn extension: Read the entire contents of a text file and return as String.
      *
      * @param self self reference
      * @param file The input file whose content is read.
      *
      * @return String content of the input file.
      *
      * @throws IOException if an exception occurs
      */
     public static Object readFully(final Object self, final Object file) throws IOException {
         File f = null;
         if (file instanceof File) {
             f = (File)file;
         } else if (file instanceof String) {
             f = new java.io.File((String)file);
         }
         if (f == null || !f.isFile()) {
             typeError("not.a.file", ScriptRuntime.safeToString(file));
             return UNDEFINED;
         }
         return new String(Source.readFully(f));
     }
     /**
      * Nashorn extension: exec a string in a separate process.
      *
      * @param self   self reference
      * @param string string to execute
      * @param input
      *
      * @return output string from the request
      * @throws IOException
      * @throws InterruptedException
      */
     public static Object exec(final Object self, final Object string, final Object input) throws IOException, InterruptedException {
         // Current global is need to fetch additional inputs and for additional results.
         final ScriptObject global = Context.getGlobal();
         // Break exec string into tokens.
         final StringTokenizer tokenizer = new StringTokenizer(JSType.toString(string));
         final String[] cmdArray = new String[tokenizer.countTokens()];
         for (int i = 0; tokenizer.hasMoreTokens(); i++) {
             cmdArray[i] = tokenizer.nextToken();
         }
         // Set up initial process.
         final ProcessBuilder processBuilder = new ProcessBuilder(cmdArray);
         // Current ENV property state.
         final Object env = global.get(ENV_NAME);
         if (env instanceof ScriptObject) {
             final ScriptObject envProperties = (ScriptObject)env;
             // If a working directory is present, use it.
             final Object pwd = envProperties.get(PWD_NAME);
             if (pwd != UNDEFINED) {
                 processBuilder.directory(new File(JSType.toString(pwd)));
             }
             // Set up ENV variables.
             final Map<String, String> environment = processBuilder.environment();
             environment.clear();
             for (Map.Entry<Object, Object> entry : envProperties.entrySet()) {
                 environment.put(JSType.toString(entry.getKey()), JSType.toString(entry.getValue()));
             }
         }
         // Start the process.
         final Process process = processBuilder.start();
         // If input is present, pass on to process.
         try (OutputStream outputStream = process.getOutputStream()) {
             if (input != UNDEFINED) {
                 outputStream.write(JSType.toString(input).getBytes());
             }
         }
         // Wait for the process to complete.
         final int exit = process.waitFor();
         // Collect output.
         String out;
          try (InputStream inputStream = process.getInputStream()) {
             final StringBuilder outBuffer = new StringBuilder();
             for (int ch; (ch = inputStream.read()) != -1; ) {
                 outBuffer.append((char)ch);
             }
             out = outBuffer.toString();
         }
         // Collect errors.
         String err;
         try (InputStream errorStream = process.getErrorStream()) {
             final StringBuilder errBuffer = new StringBuilder();
             for (int ch; (ch = errorStream.read()) != -1; ) {
                 errBuffer.append((char)ch);
             }
             err = errBuffer.toString();
         }
         // Set globals for secondary results.
         final boolean isStrict = global.isStrictContext();
         global.set(OUT_NAME, out, isStrict);
         global.set(ERR_NAME, err, isStrict);
         global.set(EXIT_NAME, exit, isStrict);
         // Return the result from stdout.
         return out;
     }
     private static MethodHandle findOwnMH(final String name, final Class<?> rtype, final Class<?>... types) {
         return MH.findStatic(MethodHandles.lookup(), ScriptingFunctions.class, name, MH.type(rtype, types));
     }
 }

Mercurial > jdk8-mips64-public > nashorn / annotate

src/jdk/nashorn/internal/runtime/ScriptingFunctions.java@43e32b36153c (annotated)

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