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 }