1 /*
   2  * Copyright (c) 2013, 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 org.graalvm.compiler.asm.amd64.AMD64Address;
  26 import org.graalvm.compiler.asm.amd64.AMD64MacroAssembler;
  27 import org.graalvm.compiler.hotspot.HotSpotBackend;
  28 import org.graalvm.compiler.lir.LIRInstructionClass;
  29 import org.graalvm.compiler.lir.Opcode;
  30 import org.graalvm.compiler.lir.StandardOp.SaveRegistersOp;
  31 import org.graalvm.compiler.lir.amd64.AMD64LIRInstruction;
  32 import org.graalvm.compiler.lir.asm.CompilationResultBuilder;
  33 import org.graalvm.compiler.lir.framemap.FrameMap;
  34 
  35 import jdk.vm.ci.code.Register;
  36 import jdk.vm.ci.code.RegisterConfig;
  37 import jdk.vm.ci.code.RegisterSaveLayout;
  38 import jdk.vm.ci.meta.JavaKind;
  39 
  40 /**
  41  * Emits code that leaves a stack frame which is tailored to call the C++ method
  42  * {@link HotSpotBackend#UNPACK_FRAMES Deoptimization::unpack_frames}.
  43  */
  44 @Opcode("LEAVE_UNPACK_FRAMES_STACK_FRAME")
  45 final class AMD64HotSpotLeaveUnpackFramesStackFrameOp extends AMD64LIRInstruction {
  46     public static final LIRInstructionClass<AMD64HotSpotLeaveUnpackFramesStackFrameOp> TYPE = LIRInstructionClass.create(AMD64HotSpotLeaveUnpackFramesStackFrameOp.class);
  47 
  48     private final Register threadRegister;
  49     private final int threadLastJavaSpOffset;
  50     private final int threadLastJavaPcOffset;
  51     private final int threadLastJavaFpOffset;
  52 
  53     private final SaveRegistersOp saveRegisterOp;
  54 
  55     AMD64HotSpotLeaveUnpackFramesStackFrameOp(Register threadRegister, int threadLastJavaSpOffset, int threadLastJavaPcOffset, int threadLastJavaFpOffset, SaveRegistersOp saveRegisterOp) {
  56         super(TYPE);
  57         this.threadRegister = threadRegister;
  58         this.threadLastJavaSpOffset = threadLastJavaSpOffset;
  59         this.threadLastJavaPcOffset = threadLastJavaPcOffset;
  60         this.threadLastJavaFpOffset = threadLastJavaFpOffset;
  61         this.saveRegisterOp = saveRegisterOp;
  62     }
  63 
  64     @Override
  65     public void emitCode(CompilationResultBuilder crb, AMD64MacroAssembler masm) {
  66         FrameMap frameMap = crb.frameMap;
  67         RegisterConfig registerConfig = frameMap.getRegisterConfig();
  68         RegisterSaveLayout registerSaveLayout = saveRegisterOp.getMap(frameMap);
  69         Register stackPointerRegister = registerConfig.getFrameRegister();
  70 
  71         // Restore stack pointer.
  72         masm.movq(stackPointerRegister, new AMD64Address(threadRegister, threadLastJavaSpOffset));
  73 
  74         // Clear last Java frame values.
  75         masm.movslq(new AMD64Address(threadRegister, threadLastJavaSpOffset), 0);
  76         masm.movslq(new AMD64Address(threadRegister, threadLastJavaPcOffset), 0);
  77         masm.movslq(new AMD64Address(threadRegister, threadLastJavaFpOffset), 0);
  78 
  79         // Restore return values.
  80         final int stackSlotSize = frameMap.getTarget().wordSize;
  81         Register integerResultRegister = registerConfig.getReturnRegister(JavaKind.Long);
  82         masm.movptr(integerResultRegister, new AMD64Address(stackPointerRegister, registerSaveLayout.registerToSlot(integerResultRegister) * stackSlotSize));
  83 
  84         Register floatResultRegister = registerConfig.getReturnRegister(JavaKind.Double);
  85         masm.movdbl(floatResultRegister, new AMD64Address(stackPointerRegister, registerSaveLayout.registerToSlot(floatResultRegister) * stackSlotSize));
  86     }
  87 }