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package jdk.internal.invoke;

import java.lang.invoke.MethodType;
import java.util.Objects;

This class describes a native call, including arguments/return shuffle moves, PC entry point and various other info which are relevant when the call will be intrinsified by C2.
/** * This class describes a native call, including arguments/return shuffle moves, PC entry point and * various other info which are relevant when the call will be intrinsified by C2. */
public class NativeEntryPoint { static { registerNatives(); } private final long addr; private final int shadowSpace; // encoded as VMRegImpl* private final long[] argMoves; private final long[] returnMoves; private final boolean needTransition; private final MethodType methodType; // C2 sees erased version (byte -> int), so need this explicitly private final String name; private NativeEntryPoint(long addr, int shadowSpace, long[] argMoves, long[] returnMoves, boolean needTransition, MethodType methodType, String name) { this.addr = addr; this.shadowSpace = shadowSpace; this.argMoves = Objects.requireNonNull(argMoves); this.returnMoves = Objects.requireNonNull(returnMoves); this.needTransition = needTransition; this.methodType = methodType; this.name = name; } public static NativeEntryPoint make(long addr, String name, ABIDescriptorProxy abi, VMStorageProxy[] argMoves, VMStorageProxy[] returnMoves, boolean needTransition, MethodType methodType) { if (returnMoves.length > 1) { throw new IllegalArgumentException("Multiple register return not supported"); } return new NativeEntryPoint( addr, abi.shadowSpaceBytes(), encodeVMStorages(argMoves), encodeVMStorages(returnMoves), needTransition, methodType, name); } private static long[] encodeVMStorages(VMStorageProxy[] moves) { long[] out = new long[moves.length]; for (int i = 0; i < moves.length; i++) { out[i] = vmStorageToVMReg(moves[i].type(), moves[i].index()); } return out; } private static native long vmStorageToVMReg(int type, int index); public MethodType type() { return methodType; } private static native void registerNatives(); }