1 /* 2 * Copyright (c) 2011, 2015, Oracle and/or its affiliates. All rights reserved. 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. 4 * 5 * This code is free software; you can redistribute it and/or modify it 6 * under the terms of the GNU General Public License version 2 only, as 7 * published by the Free Software Foundation. 8 * 9 * This code is distributed in the hope that it will be useful, but WITHOUT 10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License 12 * version 2 for more details (a copy is included in the LICENSE file that 13 * accompanied this code). 14 * 15 * You should have received a copy of the GNU General Public License version 16 * 2 along with this work; if not, write to the Free Software Foundation, 17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. 18 * 19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA 20 * or visit www.oracle.com if you need additional information or have any 21 * questions. 22 */ 23 package org.graalvm.compiler.hotspot.amd64; 24 25 import static jdk.vm.ci.code.ValueUtil.asRegister; 26 27 import org.graalvm.compiler.asm.amd64.AMD64MacroAssembler; 28 import org.graalvm.compiler.lir.LIRInstructionClass; 29 import org.graalvm.compiler.lir.Opcode; 30 import org.graalvm.compiler.lir.amd64.AMD64LIRInstruction; 31 import org.graalvm.compiler.lir.asm.CompilationResultBuilder; 32 33 import jdk.vm.ci.code.InstalledCode; 34 import jdk.vm.ci.meta.Value; 35 36 /** 37 * Performs a hard-coded tail call to the specified target, which normally should be an 38 * {@link InstalledCode} instance. 39 */ 40 @Opcode("TAILCALL") 41 public final class AMD64TailcallOp extends AMD64LIRInstruction { 42 public static final LIRInstructionClass<AMD64TailcallOp> TYPE = LIRInstructionClass.create(AMD64TailcallOp.class); 43 44 @Use protected Value target; 45 @Alive protected Value[] parameters; 46 47 public AMD64TailcallOp(Value[] parameters, Value target) { 48 super(TYPE); 49 this.target = target; 50 this.parameters = parameters; 51 } 52 53 @Override 54 public void emitCode(CompilationResultBuilder crb, AMD64MacroAssembler masm) { 55 // destroy the current frame (now the return address is the top of stack) 56 masm.leave(); 57 58 // jump to the target method 59 masm.jmp(asRegister(target)); 60 masm.ensureUniquePC(); 61 } 62 }