https://www.graalvm.org/ 
public final class org.graalvm.compiler.lir.StandardOp$SpillRegistersOp extends org.graalvm.compiler.lir.LIRInstruction
  minor version: 0
  major version: 59
  flags: flags: (0x0031) ACC_PUBLIC, ACC_FINAL, ACC_SUPER
  this_class: org.graalvm.compiler.lir.StandardOp$SpillRegistersOp
  super_class: org.graalvm.compiler.lir.LIRInstruction
{
  public static final org.graalvm.compiler.lir.LIRInstructionClass<org.graalvm.compiler.lir.StandardOp$SpillRegistersOp> TYPE;
    descriptor: Lorg/graalvm/compiler/lir/LIRInstructionClass;
    flags: (0x0019) ACC_PUBLIC, ACC_STATIC, ACC_FINAL
    Signature: Lorg/graalvm/compiler/lir/LIRInstructionClass<Lorg/graalvm/compiler/lir/StandardOp$SpillRegistersOp;>;

  static void <clinit>();
    descriptor: ()V
    flags: (0x0008) ACC_STATIC
    Code:
      stack=1, locals=0, args_size=0
         0: .line 520
            ldc Lorg/graalvm/compiler/lir/StandardOp$SpillRegistersOp;
            invokestatic org.graalvm.compiler.lir.LIRInstructionClass.create:(Ljava/lang/Class;)Lorg/graalvm/compiler/lir/LIRInstructionClass;
            putstatic org.graalvm.compiler.lir.StandardOp$SpillRegistersOp.TYPE:Lorg/graalvm/compiler/lir/LIRInstructionClass;
            return
      LocalVariableTable:
        Start  End  Slot  Name  Signature

  public void <init>();
    descriptor: ()V
    flags: (0x0001) ACC_PUBLIC
    Code:
      stack=2, locals=1, args_size=1
        start local 0 // org.graalvm.compiler.lir.StandardOp$SpillRegistersOp this
         0: .line 523
            aload 0 /* this */
            getstatic org.graalvm.compiler.lir.StandardOp$SpillRegistersOp.TYPE:Lorg/graalvm/compiler/lir/LIRInstructionClass;
            invokespecial org.graalvm.compiler.lir.LIRInstruction.<init>:(Lorg/graalvm/compiler/lir/LIRInstructionClass;)V
         1: .line 524
            return
        end local 0 // org.graalvm.compiler.lir.StandardOp$SpillRegistersOp this
      LocalVariableTable:
        Start  End  Slot  Name  Signature
            0    2     0  this  Lorg/graalvm/compiler/lir/StandardOp$SpillRegistersOp;

  public boolean destroysCallerSavedRegisters();
    descriptor: ()Z
    flags: (0x0001) ACC_PUBLIC
    Code:
      stack=1, locals=1, args_size=1
        start local 0 // org.graalvm.compiler.lir.StandardOp$SpillRegistersOp this
         0: .line 528
            iconst_1
            ireturn
        end local 0 // org.graalvm.compiler.lir.StandardOp$SpillRegistersOp this
      LocalVariableTable:
        Start  End  Slot  Name  Signature
            0    1     0  this  Lorg/graalvm/compiler/lir/StandardOp$SpillRegistersOp;

  public void emitCode(org.graalvm.compiler.lir.asm.CompilationResultBuilder);
    descriptor: (Lorg/graalvm/compiler/lir/asm/CompilationResultBuilder;)V
    flags: (0x0001) ACC_PUBLIC
    Code:
      stack=0, locals=2, args_size=2
        start local 0 // org.graalvm.compiler.lir.StandardOp$SpillRegistersOp this
        start local 1 // org.graalvm.compiler.lir.asm.CompilationResultBuilder crb
         0: .line 534
            return
        end local 1 // org.graalvm.compiler.lir.asm.CompilationResultBuilder crb
        end local 0 // org.graalvm.compiler.lir.StandardOp$SpillRegistersOp this
      LocalVariableTable:
        Start  End  Slot  Name  Signature
            0    1     0  this  Lorg/graalvm/compiler/lir/StandardOp$SpillRegistersOp;
            0    1     1   crb  Lorg/graalvm/compiler/lir/asm/CompilationResultBuilder;
    MethodParameters:
      Name  Flags
      crb   
}
SourceFile: "StandardOp.java"
NestHost: org.graalvm.compiler.lir.StandardOp
InnerClasses:
  public final SpillRegistersOp = org.graalvm.compiler.lir.StandardOp$SpillRegistersOp of org.graalvm.compiler.lir.StandardOp
    RuntimeVisibleAnnotations: 
      org.graalvm.compiler.lir.Opcode(value = "SPILLREGISTERS")