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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();
}