src/java.base/share/classes/java/nio/Heap-X-Buffer.java.template

@@ -25,10 +25,11 @@
 
 #warn This file is preprocessed before being compiled
 
 package java.nio;
 
+import sun.misc.Unsafe;
 
 /**
 #if[rw]
  * A read/write Heap$Type$Buffer.
 #else[rw]

@@ -50,10 +51,20 @@
     protected final $type$[] hb;
     protected final int offset;
 #end[rw]
     */
 
+#if[byte]
+
+    // Cached unsafe-access object
+    private static final Unsafe unsafe = Bits.unsafe();
+
+    // Cached array base offset
+    private static final long arrayBaseOffset = unsafe.arrayBaseOffset($type$[].class);
+
+#end[byte]
+
     Heap$Type$Buffer$RW$(int cap, int lim) {            // package-private
 #if[rw]
         super(-1, 0, lim, cap, new $type$[cap], 0);
         /*
         hb = new $type$[cap];

@@ -129,10 +140,16 @@
 
     protected int ix(int i) {
         return i + offset;
     }
 
+#if[byte]
+    private long byteOffset(long i) {
+        return arrayBaseOffset + i + offset;
+    }
+#end[byte]
+
     public $type$ get() {
         return hb[ix(nextGetIndex())];
     }
 
     public $type$ get(int i) {

@@ -254,31 +271,31 @@
     // char
 
 #if[rw]
 
     public char getChar() {
-        return Bits.getChar(this, ix(nextGetIndex(2)), bigEndian);
+        return unsafe.getCharUnaligned(hb, byteOffset(nextGetIndex(2)), bigEndian);
     }
 
     public char getChar(int i) {
-        return Bits.getChar(this, ix(checkIndex(i, 2)), bigEndian);
+        return unsafe.getCharUnaligned(hb, byteOffset(checkIndex(i, 2)), bigEndian);
     }
 
 #end[rw]
 
     public $Type$Buffer putChar(char x) {
 #if[rw]
-        Bits.putChar(this, ix(nextPutIndex(2)), x, bigEndian);
+        unsafe.putCharUnaligned(hb, byteOffset(nextPutIndex(2)), x, bigEndian);
         return this;
 #else[rw]
         throw new ReadOnlyBufferException();
 #end[rw]
     }
 
     public $Type$Buffer putChar(int i, char x) {
 #if[rw]
-        Bits.putChar(this, ix(checkIndex(i, 2)), x, bigEndian);
+        unsafe.putCharUnaligned(hb, byteOffset(checkIndex(i, 2)), x, bigEndian);
         return this;
 #else[rw]
         throw new ReadOnlyBufferException();
 #end[rw]
     }

@@ -305,31 +322,31 @@
     // short
 
 #if[rw]
 
     public short getShort() {
-        return Bits.getShort(this, ix(nextGetIndex(2)), bigEndian);
+        return unsafe.getShortUnaligned(hb, byteOffset(nextGetIndex(2)), bigEndian);
     }
 
     public short getShort(int i) {
-        return Bits.getShort(this, ix(checkIndex(i, 2)), bigEndian);
+        return unsafe.getShortUnaligned(hb, byteOffset(checkIndex(i, 2)), bigEndian);
     }
 
 #end[rw]
 
     public $Type$Buffer putShort(short x) {
 #if[rw]
-        Bits.putShort(this, ix(nextPutIndex(2)), x, bigEndian);
+        unsafe.putShortUnaligned(hb, byteOffset(nextPutIndex(2)), x, bigEndian);
         return this;
 #else[rw]
         throw new ReadOnlyBufferException();
 #end[rw]
     }
 
     public $Type$Buffer putShort(int i, short x) {
 #if[rw]
-        Bits.putShort(this, ix(checkIndex(i, 2)), x, bigEndian);
+        unsafe.putShortUnaligned(hb, byteOffset(checkIndex(i, 2)), x, bigEndian);
         return this;
 #else[rw]
         throw new ReadOnlyBufferException();
 #end[rw]
     }

@@ -356,31 +373,31 @@
     // int
 
 #if[rw]
 
     public int getInt() {
-        return Bits.getInt(this, ix(nextGetIndex(4)), bigEndian);
+        return unsafe.getIntUnaligned(hb, byteOffset(nextGetIndex(4)), bigEndian);
     }
 
     public int getInt(int i) {
-        return Bits.getInt(this, ix(checkIndex(i, 4)), bigEndian);
+        return unsafe.getIntUnaligned(hb, byteOffset(checkIndex(i, 4)), bigEndian);
     }
 
 #end[rw]
 
     public $Type$Buffer putInt(int x) {
 #if[rw]
-        Bits.putInt(this, ix(nextPutIndex(4)), x, bigEndian);
+        unsafe.putIntUnaligned(hb, byteOffset(nextPutIndex(4)), x, bigEndian);
         return this;
 #else[rw]
         throw new ReadOnlyBufferException();
 #end[rw]
     }
 
     public $Type$Buffer putInt(int i, int x) {
 #if[rw]
-        Bits.putInt(this, ix(checkIndex(i, 4)), x, bigEndian);
+        unsafe.putIntUnaligned(hb, byteOffset(checkIndex(i, 4)), x, bigEndian);
         return this;
 #else[rw]
         throw new ReadOnlyBufferException();
 #end[rw]
     }

@@ -407,31 +424,31 @@
     // long
 
 #if[rw]
 
     public long getLong() {
-        return Bits.getLong(this, ix(nextGetIndex(8)), bigEndian);
+        return unsafe.getLongUnaligned(hb, byteOffset(nextGetIndex(8)), bigEndian);
     }
 
     public long getLong(int i) {
-        return Bits.getLong(this, ix(checkIndex(i, 8)), bigEndian);
+        return unsafe.getLongUnaligned(hb, byteOffset(checkIndex(i, 8)), bigEndian);
     }
 
 #end[rw]
 
     public $Type$Buffer putLong(long x) {
 #if[rw]
-        Bits.putLong(this, ix(nextPutIndex(8)), x, bigEndian);
+        unsafe.putLongUnaligned(hb, byteOffset(nextPutIndex(8)), x, bigEndian);
         return this;
 #else[rw]
         throw new ReadOnlyBufferException();
 #end[rw]
     }
 
     public $Type$Buffer putLong(int i, long x) {
 #if[rw]
-        Bits.putLong(this, ix(checkIndex(i, 8)), x, bigEndian);
+        unsafe.putLongUnaligned(hb, byteOffset(checkIndex(i, 8)), x, bigEndian);
         return this;
 #else[rw]
         throw new ReadOnlyBufferException();
 #end[rw]
     }

@@ -458,31 +475,33 @@
     // float
 
 #if[rw]
 
     public float getFloat() {
-        return Bits.getFloat(this, ix(nextGetIndex(4)), bigEndian);
+        return getFloat(nextGetIndex(4));
     }
 
     public float getFloat(int i) {
-        return Bits.getFloat(this, ix(checkIndex(i, 4)), bigEndian);
+        int x = unsafe.getIntUnaligned(hb, byteOffset(checkIndex(i, 4)), bigEndian);
+        return Float.intBitsToFloat(x);
     }
 
 #end[rw]
 
     public $Type$Buffer putFloat(float x) {
 #if[rw]
-        Bits.putFloat(this, ix(nextPutIndex(4)), x, bigEndian);
+        putFloat(nextPutIndex(4), x);
         return this;
 #else[rw]
         throw new ReadOnlyBufferException();
 #end[rw]
     }
 
     public $Type$Buffer putFloat(int i, float x) {
 #if[rw]
-        Bits.putFloat(this, ix(checkIndex(i, 4)), x, bigEndian);
+        int y = Float.floatToRawIntBits(x);
+        unsafe.putIntUnaligned(hb, byteOffset(checkIndex(i, 4)), y, bigEndian);
         return this;
 #else[rw]
         throw new ReadOnlyBufferException();
 #end[rw]
     }

@@ -509,31 +528,33 @@
     // double
 
 #if[rw]
 
     public double getDouble() {
-        return Bits.getDouble(this, ix(nextGetIndex(8)), bigEndian);
+        return getDouble(nextGetIndex(8));
     }
 
     public double getDouble(int i) {
-        return Bits.getDouble(this, ix(checkIndex(i, 8)), bigEndian);
+        long x = unsafe.getLongUnaligned(hb, byteOffset(checkIndex(i, 8)), bigEndian);
+        return Double.longBitsToDouble(x);
     }
 
 #end[rw]
 
     public $Type$Buffer putDouble(double x) {
 #if[rw]
-        Bits.putDouble(this, ix(nextPutIndex(8)), x, bigEndian);
+        putDouble(nextPutIndex(8), x);
         return this;
 #else[rw]
         throw new ReadOnlyBufferException();
 #end[rw]
     }
 
     public $Type$Buffer putDouble(int i, double x) {
 #if[rw]
-        Bits.putDouble(this, ix(checkIndex(i, 8)), x, bigEndian);
+        long y = Double.doubleToRawLongBits(x);
+        unsafe.putLongUnaligned(hb, byteOffset(checkIndex(i, 4)), y, bigEndian);
         return this;
 #else[rw]
         throw new ReadOnlyBufferException();
 #end[rw]
     }