/* * Copyright (c) 2000, 2009, 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 sun.misc; import java.security.*;import java.lang.reflect.*; /** * A collection of methods for performing low-level, unsafe operations. * Although the class and all methods are public, use of this class is * limited because only trusted code can obtain instances of it. * * @author John R. Rose * @see #getUnsafe */ public final class Unsafe { private static native void registerNatives(); static { registerNatives(); sun.reflect.Reflection.registerMethodsToFilter(Unsafe.class, "getUnsafe"); } private Unsafe() {} private static final Unsafe theUnsafe = new Unsafe(); /** * Provides the caller with the capability of performing unsafe * operations. * * <p> The returned <code>Unsafe</code> object should be carefully guarded * by the caller, since it can be used to read and write data at arbitrary * memory addresses. It must never be passed to untrusted code. * * <p> Most methods in this class are very low-level, and correspond to a * small number of hardware instructions (on typical machines). Compilers * are encouraged to optimize these methods accordingly. * * <p> Here is a suggested idiom for using unsafe operations: * * <blockquote><pre> * class MyTrustedClass { * private static final Unsafe unsafe = Unsafe.getUnsafe(); * ... * private long myCountAddress = ...; * public int getCount() { return unsafe.getByte(myCountAddress); } * } * </pre></blockquote> * * (It may assist compilers to make the local variable be * <code>final</code>.) * * @exception SecurityException if a security manager exists and its * <code>checkPropertiesAccess</code> method doesn't allow * access to the system properties. */ public static Unsafe getUnsafe() { Class cc = sun.reflect.Reflection.getCallerClass(2); if (cc.getClassLoader() != null) throw new SecurityException("Unsafe"); return theUnsafe; } /// peek and poke operations /// (compilers should optimize these to memory ops) // These work on object fields in the Java heap. // They will not work on elements of packed arrays. /** * Fetches a value from a given Java variable. * More specifically, fetches a field or array element within the given * object <code>o</code> at the given offset, or (if <code>o</code> is * null) from the memory address whose numerical value is the given * offset. * <p> * The results are undefined unless one of the following cases is true: * <ul> * <li>The offset was obtained from {@link #objectFieldOffset} on * the {@link java.lang.reflect.Field} of some Java field and the object * referred to by <code>o</code> is of a class compatible with that * field's class. * * <li>The offset and object reference <code>o</code> (either null or * non-null) were both obtained via {@link #staticFieldOffset} * and {@link #staticFieldBase} (respectively) from the * reflective {@link Field} representation of some Java field. * * <li>The object referred to by <code>o</code> is an array, and the offset * is an integer of the form <code>B+N*S</code>, where <code>N</code> is * a valid index into the array, and <code>B</code> and <code>S</code> are * the values obtained by {@link #arrayBaseOffset} and {@link * #arrayIndexScale} (respectively) from the array's class. The value * referred to is the <code>N</code><em>th</em> element of the array. * * </ul> * <p> * If one of the above cases is true, the call references a specific Java * variable (field or array element). However, the results are undefined * if that variable is not in fact of the type returned by this method. * <p> * This method refers to a variable by means of two parameters, and so * it provides (in effect) a <em>double-register</em> addressing mode * for Java variables. When the object reference is null, this method * uses its offset as an absolute address. This is similar in operation * to methods such as {@link #getInt(long)}, which provide (in effect) a * <em>single-register</em> addressing mode for non-Java variables. * However, because Java variables may have a different layout in memory * from non-Java variables, programmers should not assume that these * two addressing modes are ever equivalent. Also, programmers should * remember that offsets from the double-register addressing mode cannot * be portably confused with longs used in the single-register addressing * mode. * * @param o Java heap object in which the variable resides, if any, else * null * @param offset indication of where the variable resides in a Java heap * object, if any, else a memory address locating the variable * statically * @return the value fetched from the indicated Java variable * @throws RuntimeException No defined exceptions are thrown, not even * {@link NullPointerException} */ public native int getInt(Object o, long offset); /** * Stores a value into a given Java variable. * <p> * The first two parameters are interpreted exactly as with * {@link #getInt(Object, long)} to refer to a specific * Java variable (field or array element). The given value * is stored into that variable. * <p> * The variable must be of the same type as the method * parameter <code>x</code>. * * @param o Java heap object in which the variable resides, if any, else * null * @param offset indication of where the variable resides in a Java heap * object, if any, else a memory address locating the variable * statically * @param x the value to store into the indicated Java variable * @throws RuntimeException No defined exceptions are thrown, not even * {@link NullPointerException} */ public native void putInt(Object o, long offset, int x); /** * Fetches a reference value from a given Java variable. * @see #getInt(Object, long) */ public native Object getObject(Object o, long offset); /** * Stores a reference value into a given Java variable. * <p> * Unless the reference <code>x</code> being stored is either null * or matches the field type, the results are undefined. * If the reference <code>o</code> is non-null, car marks or * other store barriers for that object (if the VM requires them) * are updated. * @see #putInt(Object, int, int) */ public native void putObject(Object o, long offset, Object x); /** @see #getInt(Object, long) */ public native boolean getBoolean(Object o, long offset); /** @see #putInt(Object, int, int) */ public native void putBoolean(Object o, long offset, boolean x); /** @see #getInt(Object, long) */ public native byte getByte(Object o, long offset); /** @see #putInt(Object, int, int) */ public native void putByte(Object o, long offset, byte x); /** @see #getInt(Object, long) */ public native short getShort(Object o, long offset); /** @see #putInt(Object, int, int) */ public native void putShort(Object o, long offset, short x); /** @see #getInt(Object, long) */ public native char getChar(Object o, long offset); /** @see #putInt(Object, int, int) */ public native void putChar(Object o, long offset, char x); /** @see #getInt(Object, long) */ public native long getLong(Object o, long offset); /** @see #putInt(Object, int, int) */ public native void putLong(Object o, long offset, long x); /** @see #getInt(Object, long) */ public native float getFloat(Object o, long offset); /** @see #putInt(Object, int, int) */ public native void putFloat(Object o, long offset, float x); /** @see #getInt(Object, long) */ public native double getDouble(Object o, long offset); /** @see #putInt(Object, int, int) */ public native void putDouble(Object o, long offset, double x); /** * This method, like all others with 32-bit offsets, was native * in a previous release but is now a wrapper which simply casts * the offset to a long value. It provides backward compatibility * with bytecodes compiled against 1.4. * @deprecated As of 1.4.1, cast the 32-bit offset argument to a long. * See {@link #staticFieldOffset}. */ @Deprecated public int getInt(Object o, int offset) { return getInt(o, (long)offset); } /** * @deprecated As of 1.4.1, cast the 32-bit offset argument to a long. * See {@link #staticFieldOffset}. */ @Deprecated public void putInt(Object o, int offset, int x) { putInt(o, (long)offset, x); } /** * @deprecated As of 1.4.1, cast the 32-bit offset argument to a long. * See {@link #staticFieldOffset}. */ @Deprecated public Object getObject(Object o, int offset) { return getObject(o, (long)offset); } /** * @deprecated As of 1.4.1, cast the 32-bit offset argument to a long. * See {@link #staticFieldOffset}. */ @Deprecated public void putObject(Object o, int offset, Object x) { putObject(o, (long)offset, x); } /** * @deprecated As of 1.4.1, cast the 32-bit offset argument to a long. * See {@link #staticFieldOffset}. */ @Deprecated public boolean getBoolean(Object o, int offset) { return getBoolean(o, (long)offset); } /** * @deprecated As of 1.4.1, cast the 32-bit offset argument to a long. * See {@link #staticFieldOffset}. */ @Deprecated public void putBoolean(Object o, int offset, boolean x) { putBoolean(o, (long)offset, x); } /** * @deprecated As of 1.4.1, cast the 32-bit offset argument to a long. * See {@link #staticFieldOffset}. */ @Deprecated public byte getByte(Object o, int offset) { return getByte(o, (long)offset); } /** * @deprecated As of 1.4.1, cast the 32-bit offset argument to a long. * See {@link #staticFieldOffset}. */ @Deprecated public void putByte(Object o, int offset, byte x) { putByte(o, (long)offset, x); } /** * @deprecated As of 1.4.1, cast the 32-bit offset argument to a long. * See {@link #staticFieldOffset}. */ @Deprecated public short getShort(Object o, int offset) { return getShort(o, (long)offset); } /** * @deprecated As of 1.4.1, cast the 32-bit offset argument to a long. * See {@link #staticFieldOffset}. */ @Deprecated public void putShort(Object o, int offset, short x) { putShort(o, (long)offset, x); } /** * @deprecated As of 1.4.1, cast the 32-bit offset argument to a long. * See {@link #staticFieldOffset}. */ @Deprecated public char getChar(Object o, int offset) { return getChar(o, (long)offset); } /** * @deprecated As of 1.4.1, cast the 32-bit offset argument to a long. * See {@link #staticFieldOffset}. */ @Deprecated public void putChar(Object o, int offset, char x) { putChar(o, (long)offset, x); } /** * @deprecated As of 1.4.1, cast the 32-bit offset argument to a long. * See {@link #staticFieldOffset}. */ @Deprecated public long getLong(Object o, int offset) { return getLong(o, (long)offset); } /** * @deprecated As of 1.4.1, cast the 32-bit offset argument to a long. * See {@link #staticFieldOffset}. */ @Deprecated public void putLong(Object o, int offset, long x) { putLong(o, (long)offset, x); } /** * @deprecated As of 1.4.1, cast the 32-bit offset argument to a long. * See {@link #staticFieldOffset}. */ @Deprecated public float getFloat(Object o, int offset) { return getFloat(o, (long)offset); } /** * @deprecated As of 1.4.1, cast the 32-bit offset argument to a long. * See {@link #staticFieldOffset}. */ @Deprecated public void putFloat(Object o, int offset, float x) { putFloat(o, (long)offset, x); } /** * @deprecated As of 1.4.1, cast the 32-bit offset argument to a long. * See {@link #staticFieldOffset}. */ @Deprecated public double getDouble(Object o, int offset) { return getDouble(o, (long)offset); } /** * @deprecated As of 1.4.1, cast the 32-bit offset argument to a long. * See {@link #staticFieldOffset}. */ @Deprecated public void putDouble(Object o, int offset, double x) { putDouble(o, (long)offset, x); } // These work on values in the C heap. /** * Fetches a value from a given memory address. If the address is zero, or * does not point into a block obtained from {@link #allocateMemory}, the * results are undefined. * * @see #allocateMemory */ public native byte getByte(long address); /** * Stores a value into a given memory address. If the address is zero, or * does not point into a block obtained from {@link #allocateMemory}, the * results are undefined. * * @see #getByte(long) */ public native void putByte(long address, byte x); /** @see #getByte(long) */ public native short getShort(long address); /** @see #putByte(long, byte) */ public native void putShort(long address, short x); /** @see #getByte(long) */ public native char getChar(long address); /** @see #putByte(long, byte) */ public native void putChar(long address, char x); /** @see #getByte(long) */ public native int getInt(long address); /** @see #putByte(long, byte) */ public native void putInt(long address, int x); /** @see #getByte(long) */ public native long getLong(long address); /** @see #putByte(long, byte) */ public native void putLong(long address, long x); /** @see #getByte(long) */ public native float getFloat(long address); /** @see #putByte(long, byte) */ public native void putFloat(long address, float x); /** @see #getByte(long) */ public native double getDouble(long address); /** @see #putByte(long, byte) */ public native void putDouble(long address, double x); /** * Fetches a native pointer from a given memory address. If the address is * zero, or does not point into a block obtained from {@link * #allocateMemory}, the results are undefined. * * <p> If the native pointer is less than 64 bits wide, it is extended as * an unsigned number to a Java long. The pointer may be indexed by any * given byte offset, simply by adding that offset (as a simple integer) to * the long representing the pointer. The number of bytes actually read * from the target address maybe determined by consulting {@link * #addressSize}. * * @see #allocateMemory */ public native long getAddress(long address); /** * Stores a native pointer into a given memory address. If the address is * zero, or does not point into a block obtained from {@link * #allocateMemory}, the results are undefined. * * <p> The number of bytes actually written at the target address maybe * determined by consulting {@link #addressSize}. * * @see #getAddress(long) */ public native void putAddress(long address, long x); /// wrappers for malloc, realloc, free: /** * Allocates a new block of native memory, of the given size in bytes. The * contents of the memory are uninitialized; they will generally be * garbage. The resulting native pointer will never be zero, and will be * aligned for all value types. Dispose of this memory by calling {@link * #freeMemory}, or resize it with {@link #reallocateMemory}. * * @throws IllegalArgumentException if the size is negative or too large * for the native size_t type * * @throws OutOfMemoryError if the allocation is refused by the system * * @see #getByte(long) * @see #putByte(long, byte) */ public native long allocateMemory(long bytes); /** * Resizes a new block of native memory, to the given size in bytes. The * contents of the new block past the size of the old block are * uninitialized; they will generally be garbage. The resulting native * pointer will be zero if and only if the requested size is zero. The * resulting native pointer will be aligned for all value types. Dispose * of this memory by calling {@link #freeMemory}, or resize it with {@link * #reallocateMemory}. The address passed to this method may be null, in * which case an allocation will be performed. * * @throws IllegalArgumentException if the size is negative or too large * for the native size_t type * * @throws OutOfMemoryError if the allocation is refused by the system * * @see #allocateMemory */ public native long reallocateMemory(long address, long bytes); /** * Sets all bytes in a given block of memory to a fixed value * (usually zero).Lines 1–500 of 1003. Load more
/* * Copyright (c) 2000, 2009, 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 sun.misc; import java.security.*; import java.lang.reflect.*; /** * A collection of methods for performing low-level, unsafe operations. * Although the class and all methods are public, use of this class is * limited because only trusted code can obtain instances of it. * * @author John R. Rose * @see #getUnsafe */ public final class Unsafe { private static native void registerNatives(); static { registerNatives(); sun.reflect.Reflection.registerMethodsToFilter(Unsafe.class, "getUnsafe"); } private Unsafe() {} private static final Unsafe theUnsafe = new Unsafe(); /** * Provides the caller with the capability of performing unsafe * operations. * * <p> The returned <code>Unsafe</code> object should be carefully guarded * by the caller, since it can be used to read and write data at arbitrary * memory addresses. It must never be passed to untrusted code. * * <p> Most methods in this class are very low-level, and correspond to a * small number of hardware instructions (on typical machines). Compilers * are encouraged to optimize these methods accordingly. * * <p> Here is a suggested idiom for using unsafe operations: * * <blockquote><pre> * class MyTrustedClass { * private static final Unsafe unsafe = Unsafe.getUnsafe(); * ... * private long myCountAddress = ...; * public int getCount() { return unsafe.getByte(myCountAddress); } * } * </pre></blockquote> * * (It may assist compilers to make the local variable be * <code>final</code>.) * * @exception SecurityException if a security manager exists and its * <code>checkPropertiesAccess</code> method doesn't allow * access to the system properties. */ public static Unsafe getUnsafe() { Class cc = sun.reflect.Reflection.getCallerClass(2); if (cc.getClassLoader() != null) throw new SecurityException("Unsafe"); return theUnsafe; } /// peek and poke operations /// (compilers should optimize these to memory ops) // These work on object fields in the Java heap. // They will not work on elements of packed arrays. /** * Fetches a value from a given Java variable. * More specifically, fetches a field or array element within the given * object <code>o</code> at the given offset, or (if <code>o</code> is * null) from the memory address whose numerical value is the given * offset. * <p> * The results are undefined unless one of the following cases is true: * <ul> * <li>The offset was obtained from {@link #objectFieldOffset} on * the {@link java.lang.reflect.Field} of some Java field and the object * referred to by <code>o</code> is of a class compatible with that * field's class. * * <li>The offset and object reference <code>o</code> (either null or * non-null) were both obtained via {@link #staticFieldOffset} * and {@link #staticFieldBase} (respectively) from the * reflective {@link Field} representation of some Java field. * * <li>The object referred to by <code>o</code> is an array, and the offset * is an integer of the form <code>B+N*S</code>, where <code>N</code> is * a valid index into the array, and <code>B</code> and <code>S</code> are * the values obtained by {@link #arrayBaseOffset} and {@link * #arrayIndexScale} (respectively) from the array's class. The value * referred to is the <code>N</code><em>th</em> element of the array. * * </ul> * <p> * If one of the above cases is true, the call references a specific Java * variable (field or array element). However, the results are undefined * if that variable is not in fact of the type returned by this method. * <p> * This method refers to a variable by means of two parameters, and so * it provides (in effect) a <em>double-register</em> addressing mode * for Java variables. When the object reference is null, this method * uses its offset as an absolute address. This is similar in operation * to methods such as {@link #getInt(long)}, which provide (in effect) a * <em>single-register</em> addressing mode for non-Java variables. * However, because Java variables may have a different layout in memory * from non-Java variables, programmers should not assume that these * two addressing modes are ever equivalent. Also, programmers should * remember that offsets from the double-register addressing mode cannot * be portably confused with longs used in the single-register addressing * mode. * * @param o Java heap object in which the variable resides, if any, else * null * @param offset indication of where the variable resides in a Java heap * object, if any, else a memory address locating the variable * statically * @return the value fetched from the indicated Java variable * @throws RuntimeException No defined exceptions are thrown, not even * {@link NullPointerException} */ public native int getInt(Object o, long offset); /** * Stores a value into a given Java variable. * <p> * The first two parameters are interpreted exactly as with * {@link #getInt(Object, long)} to refer to a specific * Java variable (field or array element). The given value * is stored into that variable. * <p> * The variable must be of the same type as the method * parameter <code>x</code>. * * @param o Java heap object in which the variable resides, if any, else * null * @param offset indication of where the variable resides in a Java heap * object, if any, else a memory address locating the variable * statically * @param x the value to store into the indicated Java variable * @throws RuntimeException No defined exceptions are thrown, not even * {@link NullPointerException} */ public native void putInt(Object o, long offset, int x); /** * Fetches a reference value from a given Java variable. * @see #getInt(Object, long) */ public native Object getObject(Object o, long offset); /** * Stores a reference value into a given Java variable. * <p> * Unless the reference <code>x</code> being stored is either null * or matches the field type, the results are undefined. * If the reference <code>o</code> is non-null, car marks or * other store barriers for that object (if the VM requires them) * are updated. * @see #putInt(Object, int, int) */ public native void putObject(Object o, long offset, Object x); /** @see #getInt(Object, long) */ public native boolean getBoolean(Object o, long offset); /** @see #putInt(Object, int, int) */ public native void putBoolean(Object o, long offset, boolean x); /** @see #getInt(Object, long) */ public native byte getByte(Object o, long offset); /** @see #putInt(Object, int, int) */ public native void putByte(Object o, long offset, byte x); /** @see #getInt(Object, long) */ public native short getShort(Object o, long offset); /** @see #putInt(Object, int, int) */ public native void putShort(Object o, long offset, short x); /** @see #getInt(Object, long) */ public native char getChar(Object o, long offset); /** @see #putInt(Object, int, int) */ public native void putChar(Object o, long offset, char x); /** @see #getInt(Object, long) */ public native long getLong(Object o, long offset); /** @see #putInt(Object, int, int) */ public native void putLong(Object o, long offset, long x); /** @see #getInt(Object, long) */ public native float getFloat(Object o, long offset); /** @see #putInt(Object, int, int) */ public native void putFloat(Object o, long offset, float x); /** @see #getInt(Object, long) */ public native double getDouble(Object o, long offset); /** @see #putInt(Object, int, int) */ public native void putDouble(Object o, long offset, double x); /** * This method, like all others with 32-bit offsets, was native * in a previous release but is now a wrapper which simply casts * the offset to a long value. It provides backward compatibility * with bytecodes compiled against 1.4. * @deprecated As of 1.4.1, cast the 32-bit offset argument to a long. * See {@link #staticFieldOffset}. */ @Deprecated public int getInt(Object o, int offset) { return getInt(o, (long)offset); } /** * @deprecated As of 1.4.1, cast the 32-bit offset argument to a long. * See {@link #staticFieldOffset}. */ @Deprecated public void putInt(Object o, int offset, int x) { putInt(o, (long)offset, x); } /** * @deprecated As of 1.4.1, cast the 32-bit offset argument to a long. * See {@link #staticFieldOffset}. */ @Deprecated public Object getObject(Object o, int offset) { return getObject(o, (long)offset); } /** * @deprecated As of 1.4.1, cast the 32-bit offset argument to a long. * See {@link #staticFieldOffset}. */ @Deprecated public void putObject(Object o, int offset, Object x) { putObject(o, (long)offset, x); } /** * @deprecated As of 1.4.1, cast the 32-bit offset argument to a long. * See {@link #staticFieldOffset}. */ @Deprecated public boolean getBoolean(Object o, int offset) { return getBoolean(o, (long)offset); } /** * @deprecated As of 1.4.1, cast the 32-bit offset argument to a long. * See {@link #staticFieldOffset}. */ @Deprecated public void putBoolean(Object o, int offset, boolean x) { putBoolean(o, (long)offset, x); } /** * @deprecated As of 1.4.1, cast the 32-bit offset argument to a long. * See {@link #staticFieldOffset}. */ @Deprecated public byte getByte(Object o, int offset) { return getByte(o, (long)offset); } /** * @deprecated As of 1.4.1, cast the 32-bit offset argument to a long. * See {@link #staticFieldOffset}. */ @Deprecated public void putByte(Object o, int offset, byte x) { putByte(o, (long)offset, x); } /** * @deprecated As of 1.4.1, cast the 32-bit offset argument to a long. * See {@link #staticFieldOffset}. */ @Deprecated public short getShort(Object o, int offset) { return getShort(o, (long)offset); } /** * @deprecated As of 1.4.1, cast the 32-bit offset argument to a long. * See {@link #staticFieldOffset}. */ @Deprecated public void putShort(Object o, int offset, short x) { putShort(o, (long)offset, x); } /** * @deprecated As of 1.4.1, cast the 32-bit offset argument to a long. * See {@link #staticFieldOffset}. */ @Deprecated public char getChar(Object o, int offset) { return getChar(o, (long)offset); } /** * @deprecated As of 1.4.1, cast the 32-bit offset argument to a long. * See {@link #staticFieldOffset}. */ @Deprecated public void putChar(Object o, int offset, char x) { putChar(o, (long)offset, x); } /** * @deprecated As of 1.4.1, cast the 32-bit offset argument to a long. * See {@link #staticFieldOffset}. */ @Deprecated public long getLong(Object o, int offset) { return getLong(o, (long)offset); } /** * @deprecated As of 1.4.1, cast the 32-bit offset argument to a long. * See {@link #staticFieldOffset}. */ @Deprecated public void putLong(Object o, int offset, long x) { putLong(o, (long)offset, x); } /** * @deprecated As of 1.4.1, cast the 32-bit offset argument to a long. * See {@link #staticFieldOffset}. */ @Deprecated public float getFloat(Object o, int offset) { return getFloat(o, (long)offset); } /** * @deprecated As of 1.4.1, cast the 32-bit offset argument to a long. * See {@link #staticFieldOffset}. */ @Deprecated public void putFloat(Object o, int offset, float x) { putFloat(o, (long)offset, x); } /** * @deprecated As of 1.4.1, cast the 32-bit offset argument to a long. * See {@link #staticFieldOffset}. */ @Deprecated public double getDouble(Object o, int offset) { return getDouble(o, (long)offset); } /** * @deprecated As of 1.4.1, cast the 32-bit offset argument to a long. * See {@link #staticFieldOffset}. */ @Deprecated public void putDouble(Object o, int offset, double x) { putDouble(o, (long)offset, x); } // These work on values in the C heap. /** * Fetches a value from a given memory address. If the address is zero, or * does not point into a block obtained from {@link #allocateMemory}, the * results are undefined. * * @see #allocateMemory */ public native byte getByte(long address); /** * Stores a value into a given memory address. If the address is zero, or * does not point into a block obtained from {@link #allocateMemory}, the * results are undefined. * * @see #getByte(long) */ public native void putByte(long address, byte x); /** @see #getByte(long) */ public native short getShort(long address); /** @see #putByte(long, byte) */ public native void putShort(long address, short x); /** @see #getByte(long) */ public native char getChar(long address); /** @see #putByte(long, byte) */ public native void putChar(long address, char x); /** @see #getByte(long) */ public native int getInt(long address); /** @see #putByte(long, byte) */ public native void putInt(long address, int x); /** @see #getByte(long) */ public native long getLong(long address); /** @see #putByte(long, byte) */ public native void putLong(long address, long x); /** @see #getByte(long) */ public native float getFloat(long address); /** @see #putByte(long, byte) */ public native void putFloat(long address, float x); /** @see #getByte(long) */ public native double getDouble(long address); /** @see #putByte(long, byte) */ public native void putDouble(long address, double x); /** * Fetches a native pointer from a given memory address. If the address is * zero, or does not point into a block obtained from {@link * #allocateMemory}, the results are undefined. * * <p> If the native pointer is less than 64 bits wide, it is extended as * an unsigned number to a Java long. The pointer may be indexed by any * given byte offset, simply by adding that offset (as a simple integer) to * the long representing the pointer. The number of bytes actually read * from the target address maybe determined by consulting {@link * #addressSize}. * * @see #allocateMemory */ public native long getAddress(long address); /** * Stores a native pointer into a given memory address. If the address is * zero, or does not point into a block obtained from {@link * #allocateMemory}, the results are undefined. * * <p> The number of bytes actually written at the target address maybe * determined by consulting {@link #addressSize}. * * @see #getAddress(long) */ public native void putAddress(long address, long x); /// wrappers for malloc, realloc, free: /** * Allocates a new block of native memory, of the given size in bytes. The * contents of the memory are uninitialized; they will generally be * garbage. The resulting native pointer will never be zero, and will be * aligned for all value types. Dispose of this memory by calling {@link * #freeMemory}, or resize it with {@link #reallocateMemory}. * * @throws IllegalArgumentException if the size is negative or too large * for the native size_t type * * @throws OutOfMemoryError if the allocation is refused by the system * * @see #getByte(long) * @see #putByte(long, byte) */ public native long allocateMemory(long bytes); /** * Resizes a new block of native memory, to the given size in bytes. The * contents of the new block past the size of the old block are * uninitialized; they will generally be garbage. The resulting native * pointer will be zero if and only if the requested size is zero. The * resulting native pointer will be aligned for all value types. Dispose * of this memory by calling {@link #freeMemory}, or resize it with {@link * #reallocateMemory}. The address passed to this method may be null, in * which case an allocation will be performed. * * @throws IllegalArgumentException if the size is negative or too large * for the native size_t type * * @throws OutOfMemoryError if the allocation is refused by the system * * @see #allocateMemory */ public native long reallocateMemory(long address, long bytes); /** * Sets all bytes in a given block of memory to a fixed value * (usually zero).