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 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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 * 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
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 * 2 along with this work; if not, write to the Free Software Foundation,
 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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package org.graalvm.compiler.hotspot;

A compact representation of the different encoding strategies for Objects and metadata.
/** * A compact representation of the different encoding strategies for Objects and metadata. */
public class CompressEncoding { public final long base; public final int shift; public final int alignment; CompressEncoding(long base, int shift, int alignment) { this.base = base; this.shift = shift; this.alignment = alignment; } public int compress(long ptr) { if (ptr == 0L) { return 0; } else { return (int) ((ptr - base) >>> shift); } } public long uncompress(int ptr) { if (ptr == 0) { return 0L; } else { return ((ptr & 0xFFFFFFFFL) << shift) + base; } } @Override public String toString() { return "base: " + base + " shift: " + shift + " alignment: " + alignment; } @Override public int hashCode() { final int prime = 31; int result = 1; result = prime * result + alignment; result = prime * result + (int) (base ^ (base >>> 32)); result = prime * result + shift; return result; } @Override public boolean equals(Object obj) { if (obj instanceof CompressEncoding) { CompressEncoding other = (CompressEncoding) obj; return alignment == other.alignment && base == other.base && shift == other.shift; } else { return false; } } }