com.oracle.graal.python.runtime.object.IDUtils Maven / Gradle / Ivy
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package com.oracle.graal.python.runtime.object;
import java.math.BigInteger;
import java.util.Collections;
import java.util.Map;
import java.util.WeakHashMap;
import java.util.concurrent.atomic.AtomicLong;
import com.oracle.graal.python.builtins.PythonBuiltinClassType;
import com.oracle.graal.python.util.WeakIdentityHashMap;
import com.oracle.truffle.api.CompilerDirectives;
import com.oracle.truffle.api.strings.TruffleString;
public final class IDUtils {
private static final long MAX_OBJECT_ID = (1L << 62) - 1;
private static final long MAX_DOUBLE_ID = (1L << 63) - 1;
private static final long ID_MASK_DOUBLE = 0b0; // this gives doubles 63 bits
private static final long ID_MASK_LONG = 0b10; // 62 bits for longs until overflow
private static final long ID_MASK_OBJECT = 0b11; // 62 bits for objects (48 bits max num
// addressable objects at once)
private static final BigInteger ID_MASK_LONG_BI = BigInteger.valueOf(ID_MASK_LONG);
private static final BigInteger ID_MASK_DOUBLE_BI = BigInteger.valueOf(ID_MASK_DOUBLE);
// reserved ids
private enum ReservedID {
none,
notImplemented,
ellipsis,
emptyBytes,
emptyUnicode,
emptyTuple,
emptyFrozenSet,
}
private static final int NUM_RESERVED_IDS = ReservedID.values().length;
private static final long ID_OFFSET = 1 + NUM_RESERVED_IDS + PythonBuiltinClassType.values().length;
public static final long ID_NONE = getId(ReservedID.none);
public static final long ID_NOTIMPLEMENTED = getId(ReservedID.notImplemented);
public static final long ID_ELLIPSIS = getId(ReservedID.ellipsis);
public static final long ID_EMPTY_BYTES = getId(ReservedID.emptyBytes);
public static final long ID_EMPTY_UNICODE = getId(ReservedID.emptyUnicode);
public static final long ID_EMPTY_TUPLE = getId(ReservedID.emptyTuple);
public static final long ID_EMPTY_FROZENSET = getId(ReservedID.emptyFrozenSet);
private final Map
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