1 /*
   2  * Copyright (c) 2012, 2018, 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 
  24 
  25 package org.graalvm.compiler.hotspot.amd64;
  26 
  27 import static org.graalvm.compiler.lir.LIRInstruction.OperandFlag.REG;
  28 import static org.graalvm.compiler.lir.LIRInstruction.OperandFlag.STACK;
  29 import static jdk.vm.ci.amd64.AMD64.rbp;
  30 import static jdk.vm.ci.code.ValueUtil.asRegister;
  31 import static jdk.vm.ci.code.ValueUtil.isStackSlot;
  32 
  33 import org.graalvm.compiler.asm.amd64.AMD64Address;
  34 import org.graalvm.compiler.asm.amd64.AMD64MacroAssembler;
  35 import org.graalvm.compiler.lir.LIRInstructionClass;
  36 import org.graalvm.compiler.lir.amd64.AMD64LIRInstruction;
  37 import org.graalvm.compiler.lir.asm.CompilationResultBuilder;
  38 
  39 import jdk.vm.ci.code.Register;
  40 import jdk.vm.ci.meta.AllocatableValue;
  41 
  42 /**
  43  * Superclass for operations that use the value of RBP saved in a method's prologue.
  44  */
  45 abstract class AMD64HotSpotEpilogueOp extends AMD64LIRInstruction implements AMD64HotSpotRestoreRbpOp {
  46 
  47     protected AMD64HotSpotEpilogueOp(LIRInstructionClass<? extends AMD64HotSpotEpilogueOp> c) {
  48         super(c);
  49     }
  50 
  51     @Use({REG, STACK}) private AllocatableValue savedRbp = PLACEHOLDER;
  52 
  53     protected void leaveFrameAndRestoreRbp(CompilationResultBuilder crb, AMD64MacroAssembler masm) {
  54         leaveFrameAndRestoreRbp(savedRbp, crb, masm);
  55     }
  56 
  57     static void leaveFrameAndRestoreRbp(AllocatableValue savedRbp, CompilationResultBuilder crb, AMD64MacroAssembler masm) {
  58         if (isStackSlot(savedRbp)) {
  59             // Restoring RBP from the stack must be done before the frame is removed
  60             masm.movq(rbp, (AMD64Address) crb.asAddress(savedRbp));
  61         } else {
  62             Register framePointer = asRegister(savedRbp);
  63             if (!framePointer.equals(rbp)) {
  64                 masm.movq(rbp, framePointer);
  65             }
  66         }
  67         crb.frameContext.leave(crb);
  68     }
  69 
  70     @Override
  71     public void setSavedRbp(AllocatableValue value) {
  72         savedRbp = value;
  73     }
  74 }