1 /*
   2  * Copyright (c) 2013, 2016, 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.aarch64;
  24 
  25 import org.graalvm.compiler.asm.aarch64.AArch64MacroAssembler;
  26 import org.graalvm.compiler.asm.aarch64.AArch64MacroAssembler.ScratchRegister;
  27 import org.graalvm.compiler.hotspot.GraalHotSpotVMConfig;
  28 import org.graalvm.compiler.lir.LIRInstructionClass;
  29 import org.graalvm.compiler.lir.aarch64.AArch64BlockEndOp;
  30 import org.graalvm.compiler.lir.asm.CompilationResultBuilder;
  31 
  32 import jdk.vm.ci.code.Register;
  33 
  34 /**
  35  * Superclass for operations that leave a method's frame.
  36  */
  37 abstract class AArch64HotSpotEpilogueOp extends AArch64BlockEndOp {
  38 
  39     private final GraalHotSpotVMConfig config;
  40 
  41     protected AArch64HotSpotEpilogueOp(LIRInstructionClass<? extends AArch64HotSpotEpilogueOp> c, GraalHotSpotVMConfig config) {
  42         super(c);
  43         this.config = config;
  44     }
  45 
  46     protected void leaveFrame(CompilationResultBuilder crb, AArch64MacroAssembler masm, boolean emitSafepoint) {
  47         assert crb.frameContext != null : "We never elide frames in aarch64";
  48         crb.frameContext.leave(crb);
  49         if (emitSafepoint) {
  50             try (ScratchRegister sc = masm.getScratchRegister()) {
  51                 Register scratch = sc.getRegister();
  52                 AArch64HotSpotSafepointOp.emitCode(crb, masm, config, true, scratch, null);
  53             }
  54         }
  55     }
  56 }