8259947: (fs) Optimize UnixPath.encode implementation

Reviewed-by: chegar, shade, alanb

Author: cl4es

src/java.base/macosx/classes/sun/nio/fs/BsdNativeDispatcher.java

@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2008, 2019, Oracle and/or its affiliates. All rights reserved.
+ * Copyright (c) 2008, 2021, 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
@@ -25,9 +25,6 @@
 
 package sun.nio.fs;
 
-import java.security.AccessController;
-import java.security.PrivilegedAction;
-
 /**
  * Bsd specific system calls.
  */

src/java.base/macosx/classes/sun/nio/fs/MacOSXFileSystem.java

@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2008, 2012, Oracle and/or its affiliates. All rights reserved.
+ * Copyright (c) 2008, 2021, 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
@@ -25,9 +25,6 @@
 
 package sun.nio.fs;
 
-import java.nio.file.*;
-import java.io.IOException;
-import java.util.*;
 import java.util.regex.Pattern;
 
 import static sun.nio.fs.MacOSXNativeDispatcher.*;
@@ -47,14 +44,18 @@ Pattern compilePathMatchPattern(String expr) {
         return Pattern.compile(expr, Pattern.CANON_EQ) ;
     }
 
-    char[] normalizeNativePath(char[] path) {
-        for (char c : path) {
+    @Override
+    String normalizeNativePath(String path) {
+        for (int i = 0; i < path.length(); i++) {
+            char c = path.charAt(i);
             if (c > 0x80)
-                return normalizepath(path, kCFStringNormalizationFormD);
+                return new String(normalizepath(path.toCharArray(),
+                                  kCFStringNormalizationFormD));
         }
         return path;
     }
 
+    @Override
     String normalizeJavaPath(String path) {
         for (int i = 0; i < path.length(); i++) {
             if (path.charAt(i) > 0x80)

src/java.base/macosx/classes/sun/nio/fs/MacOSXNativeDispatcher.java

@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2008, 2012, Oracle and/or its affiliates. All rights reserved.
+ * Copyright (c) 2008, 2021, 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
@@ -25,9 +25,6 @@
 
 package sun.nio.fs;
 
-import java.security.AccessController;
-import java.security.PrivilegedAction;
-
 /**
  * MacOSX specific system calls.
  */

src/java.base/unix/classes/sun/nio/fs/UnixFileSystem.java

@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2008, 2020, Oracle and/or its affiliates. All rights reserved.
+ * Copyright (c) 2008, 2021, 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
@@ -343,7 +343,7 @@ Pattern compilePathMatchPattern(String expr) {
     // Override if the platform uses different Unicode normalization form
     // for native file path. For example on MacOSX, the native path is stored
     // in Unicode NFD form.
-    char[] normalizeNativePath(char[] path) {
+    String normalizeNativePath(String path) {
         return path;
     }
 

src/java.base/unix/classes/sun/nio/fs/UnixPath.java

@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2008, 2020, Oracle and/or its affiliates. All rights reserved.
+ * Copyright (c) 2008, 2021, 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
@@ -25,26 +25,25 @@
 
 package sun.nio.fs;
 
-import java.nio.*;
 import java.nio.file.*;
 import java.nio.charset.*;
 import java.io.*;
 import java.net.URI;
 import java.util.*;
-import java.lang.ref.SoftReference;
+
+import jdk.internal.access.JavaLangAccess;
+import jdk.internal.access.SharedSecrets;
 
 import static sun.nio.fs.UnixNativeDispatcher.*;
 import static sun.nio.fs.UnixConstants.*;
 
 /**
- * Solaris/Linux implementation of java.nio.file.Path
+ * Linux/Mac implementation of java.nio.file.Path
  */
-
 class UnixPath implements Path {
-    private static ThreadLocal<SoftReference<CharsetEncoder>> encoder =
-        new ThreadLocal<SoftReference<CharsetEncoder>>();
 
-    // FIXME - eliminate this reference to reduce space
+    private static final JavaLangAccess JLA = SharedSecrets.getJavaLangAccess();
+
     private final UnixFileSystem fs;
 
     // internal representation
@@ -115,43 +114,13 @@ private static String normalize(String input, int len, int off) {
 
     // encodes the given path-string into a sequence of bytes
     private static byte[] encode(UnixFileSystem fs, String input) {
-        SoftReference<CharsetEncoder> ref = encoder.get();
-        CharsetEncoder ce = (ref != null) ? ref.get() : null;
-        if (ce == null) {
-            ce = Util.jnuEncoding().newEncoder()
-                .onMalformedInput(CodingErrorAction.REPORT)
-                .onUnmappableCharacter(CodingErrorAction.REPORT);
-            encoder.set(new SoftReference<>(ce));
-        }
-
-        char[] ca = fs.normalizeNativePath(input.toCharArray());
-
-        // size output buffer for worse-case size
-        byte[] ba = new byte[(int)(ca.length * (double)ce.maxBytesPerChar())];
-
-        // encode
-        ByteBuffer bb = ByteBuffer.wrap(ba);
-        CharBuffer cb = CharBuffer.wrap(ca);
-        ce.reset();
-        CoderResult cr = ce.encode(cb, bb, true);
-        boolean error;
-        if (!cr.isUnderflow()) {
-            error = true;
-        } else {
-            cr = ce.flush(bb);
-            error = !cr.isUnderflow();
-        }
-        if (error) {
+        input = fs.normalizeNativePath(input);
+        try {
+            return JLA.getBytesNoRepl(input, Util.jnuEncoding());
+        } catch (CharacterCodingException cce) {
             throw new InvalidPathException(input,
                 "Malformed input or input contains unmappable characters");
         }
-
-        // trim result to actual length if required
-        int len = bb.position();
-        if (len != ba.length)
-            ba = Arrays.copyOf(ba, len);
-
-        return ba;
     }
 
     // package-private

test/micro/org/openjdk/bench/java/io/FileOpen.java

@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2020, Oracle and/or its affiliates. All rights reserved.
+ * Copyright (c) 2020, 2021, 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
@@ -27,24 +27,24 @@
 
 import java.io.File;
 import java.io.IOException;
-import java.nio.file.Files;
+import java.nio.file.Path;
 import java.util.concurrent.TimeUnit;
 
 /**
- * Tests the overheads of I/O API.
+ * Tests the overheads of creating File objects, and converting such objects to Paths.
  */
 @BenchmarkMode(Mode.AverageTime)
-@OutputTimeUnit(TimeUnit.MICROSECONDS)
+@OutputTimeUnit(TimeUnit.NANOSECONDS)
 @State(Scope.Thread)
 @Warmup(time=2, iterations=5)
 @Measurement(time=3, iterations=5)
 @Fork(value=2, jvmArgs="-Xmx1g")
 public class FileOpen {
 
-    public String normalFile = "/test/dir/file/name.txt";
-    public String root = "/";
-    public String trailingSlash = "/test/dir/file/name.txt/";
-    public String notNormalizedFile = "/test/dir/file//name.txt";
+    private String normalFile = "/test/dir/file/name.txt";
+    private String root = "/";
+    private String trailingSlash = "/test/dir/file/name.txt/";
+    private String notNormalizedFile = "/test/dir/file//name.txt";
 
     public File tmp;
 
@@ -68,6 +68,11 @@ public File normalized() {
         return new File(normalFile);
     }
 
+    @Benchmark
+    public File root() {
+        return new File(root);
+    }
+
     @Benchmark
     public File trailingSlash() {
         return new File(trailingSlash);
@@ -85,4 +90,32 @@ public boolean booleanAttributes() {
                 && tmp.isDirectory()
                 && tmp.isFile();
     }
+
+    @Benchmark
+    public void mixToPath(Blackhole bh)  {
+        bh.consume(new File(normalFile).toPath());
+        bh.consume(new File(root).toPath());
+        bh.consume(new File(trailingSlash).toPath());
+        bh.consume(new File(notNormalizedFile).toPath());
+    }
+
+    @Benchmark
+    public Path normalizedToPath() {
+        return new File(normalFile).toPath();
+    }
+
+    @Benchmark
+    public Path rootToPath() {
+        return new File(root).toPath();
+    }
+
+    @Benchmark
+    public Path trailingSlashToPath() {
+        return new File(trailingSlash).toPath();
+    }
+
+    @Benchmark
+    public Path notNormalizedToPath() {
+        return new File(notNormalizedFile).toPath();
+    }
 }