8072775: Tremendous memory usage by JTextArea

Reviewed-by: vadim, prr

src/share/classes/sun/font/StandardTextSource.java

 /*
- * Copyright (c) 1998, 2013, Oracle and/or its affiliates. All rights reserved.
+ * Copyright (c) 1998, 2015, 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
@@ -33,42 +33,43 @@ import java.awt.Font;
 import java.awt.font.FontRenderContext;
 import java.awt.font.LineMetrics;
 
-public class StandardTextSource extends TextSource {
-  char[] chars;
-  int start;
-  int len;
-  int cstart;
-  int clen;
-  int level; // assumed all uniform
-  int flags; // see GlyphVector.java
-  Font font;
-  FontRenderContext frc;
-  CoreMetrics cm;
-
-  /**
-   * Create a simple implementation of a TextSource.
-   *
-   * Chars is an array containing clen chars in the context, in
-   * logical order, contiguously starting at cstart.  Start and len
-   * represent that portion of the context representing the true
-   * source; start, like cstart, is relative to the start of the
-   * character array.
-   *
-   * Level is the bidi level (0-63 for the entire context. Flags is
-   * the layout flags. Font is the font, frc is the render context,
-   * and lm is the line metrics for the entire source text, but not
-   * necessarily the context.
-   */
-  public StandardTextSource(char[] chars,
-                            int start,
-                            int len,
-                            int cstart,
-                            int clen,
-                            int level,
-                            int flags,
-                            Font font,
-                            FontRenderContext frc,
-                            CoreMetrics cm) {
+final class StandardTextSource extends TextSource {
+
+    private final char[] chars;
+    private final int start;
+    private final int len;
+    private final int cstart;
+    private final int clen;
+    private final int level; // assumed all uniform
+    private final int flags; // see GlyphVector.java
+    private final Font font;
+    private final FontRenderContext frc;
+    private final CoreMetrics cm;
+
+    /**
+     * Create a simple implementation of a TextSource.
+     *
+     * Chars is an array containing clen chars in the context, in
+     * logical order, contiguously starting at cstart.  Start and len
+     * represent that portion of the context representing the true
+     * source; start, like cstart, is relative to the start of the
+     * character array.
+     *
+     * Level is the bidi level (0-63 for the entire context. Flags is
+     * the layout flags. Font is the font, frc is the render context,
+     * and lm is the line metrics for the entire source text, but not
+     * necessarily the context.
+     */
+    StandardTextSource(char[] chars,
+                       int start,
+                       int len,
+                       int cstart,
+                       int clen,
+                       int level,
+                       int flags,
+                       Font font,
+                       FontRenderContext frc,
+                       CoreMetrics cm) {
     if (chars == null) {
       throw new IllegalArgumentException("bad chars: null");
     }
@@ -97,7 +98,7 @@ public class StandardTextSource extends TextSource {
       throw new IllegalArgumentException("bad frc: null");
     }
 
-    this.chars = chars.clone();
+    this.chars = chars;
     this.start = start;
     this.len = len;
     this.cstart = cstart;
@@ -115,40 +116,10 @@ public class StandardTextSource extends TextSource {
     }
   }
 
-  /** Create a StandardTextSource whose context is coextensive with the source. */
-  public StandardTextSource(char[] chars,
-                            int start,
-                            int len,
-                            int level,
-                            int flags,
-                            Font font,
-                            FontRenderContext frc,
-                            CoreMetrics cm) {
-    this(chars, start, len, start, len, level, flags, font, frc, cm);
-  }
-
-  /** Create a StandardTextSource whose context and source are coextensive with the entire char array. */
-  public StandardTextSource(char[] chars,
-                            int level,
-                            int flags,
-                            Font font,
-                            FontRenderContext frc) {
-    this(chars, 0, chars.length, 0, chars.length, level, flags, font, frc, null);
-  }
-
-  /** Create a StandardTextSource whose context and source are all the text in the String. */
-  public StandardTextSource(String str,
-                            int level,
-                            int flags,
-                            Font font,
-                            FontRenderContext frc) {
-    this(str.toCharArray(), 0, str.length(), 0, str.length(), level, flags, font, frc, null);
-  }
-
   // TextSource API
 
   public char[] getChars() {
-    return chars.clone();
+    return chars;
   }
 
   public int getStart() {

src/share/classes/sun/font/TextLabelFactory.java

 /*
- * Copyright (c) 1998, 2013, Oracle and/or its affiliates. All rights reserved.
+ * Copyright (c) 1998, 2015, 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
@@ -48,12 +48,12 @@ import java.text.Bidi;
    * @see TextLayout
    */
 
-public class TextLabelFactory {
-  private FontRenderContext frc;
-  private char[] text;
-  private Bidi bidi;
+public final class TextLabelFactory {
+  private final FontRenderContext frc;
+  private final char[] text;
+  private final Bidi bidi;
   private Bidi lineBidi;
-  private int flags;
+  private final int flags;
   private int lineStart;
   private int lineLimit;
 

test/javax/swing/JTextArea/TextViewOOM/TextViewOOM.java

+/*
+ * Copyright (c) 2015, 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.
+ *
+ * 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.
+ */
+
+import java.awt.EventQueue;
+
+import javax.swing.JFrame;
+import javax.swing.JScrollPane;
+import javax.swing.JTextArea;
+
+/**
+ * @test
+ * @bug 8072775
+ * @run main/othervm -Xmx80m TextViewOOM
+ */
+public class TextViewOOM {
+
+    private static JFrame frame;
+    private static JTextArea ta;
+    private static final String STRING = "\uDC00\uD802\uDFFF";
+    private static final int N = 5000;
+
+    private static void createAndShowGUI() {
+        frame = new JFrame();
+        final JScrollPane jScrollPane1 = new JScrollPane();
+        ta = new JTextArea();
+
+        ta.setEditable(false);
+        ta.setColumns(20);
+        ta.setRows(5);
+        jScrollPane1.setViewportView(ta);
+        frame.add(ta);
+
+        frame.pack();
+        frame.setLocationRelativeTo(null);
+        frame.setVisible(true);
+    }
+
+    public static void main(final String[] args) throws Exception {
+        /* Create and display the form */
+        EventQueue.invokeAndWait(TextViewOOM::createAndShowGUI);
+        for (int i = 0; i < 10; i++) {
+            System.gc();
+            Thread.sleep(1000);
+        }
+        long mem = Runtime.getRuntime().totalMemory() - Runtime.getRuntime().freeMemory();
+        System.err.println("Memory before creating the text: "+mem);
+        final StringBuilder sb = new StringBuilder(N * STRING.length());
+        for (int i = 0; i < N; i++) {
+            sb.append(STRING);
+        }
+        for (int i = 0; i < 10; i++) {
+            System.gc();
+            Thread.sleep(1000);
+        }
+        mem = Runtime.getRuntime().totalMemory() - Runtime.getRuntime().freeMemory();
+        System.err.println("Memory after  creating the text: "+mem);
+
+        EventQueue.invokeAndWait(() -> {
+            ta.setText(sb.toString());
+            for (int i = 0; i < 10; i++) {
+                System.gc();
+                try {Thread.sleep(200);} catch (InterruptedException iex) {}
+            }
+            long mem1 = Runtime.getRuntime().totalMemory() - Runtime.getRuntime().freeMemory();
+            System.err.println("Memory after  setting the text: " + mem1);
+        });
+        for (int i = 0; i < 10; i++) {
+            System.gc();
+            Thread.sleep(1000);
+        }
+        mem = Runtime.getRuntime().totalMemory() - Runtime.getRuntime().freeMemory();
+        System.err.println("Final memory  after everything: " + mem);
+        EventQueue.invokeAndWait(frame::dispose);
+    }
+}