1 /*
   2  * Copyright (c) 2015, 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.lir.LIRInstructionClass;
  28 import org.graalvm.compiler.lir.LabelRef;
  29 import org.graalvm.compiler.lir.SwitchStrategy;
  30 import org.graalvm.compiler.lir.amd64.AMD64ControlFlow;
  31 import org.graalvm.compiler.lir.asm.CompilationResultBuilder;
  32 
  33 import jdk.vm.ci.code.Register;
  34 import jdk.vm.ci.code.ValueUtil;
  35 import jdk.vm.ci.hotspot.HotSpotMetaspaceConstant;
  36 import jdk.vm.ci.meta.Constant;
  37 import jdk.vm.ci.meta.Value;
  38 
  39 final class AMD64HotSpotStrategySwitchOp extends AMD64ControlFlow.StrategySwitchOp {
  40     public static final LIRInstructionClass<AMD64HotSpotStrategySwitchOp> TYPE = LIRInstructionClass.create(AMD64HotSpotStrategySwitchOp.class);
  41 
  42     AMD64HotSpotStrategySwitchOp(SwitchStrategy strategy, LabelRef[] keyTargets, LabelRef defaultTarget, Value key, Value scratch) {
  43         super(TYPE, strategy, keyTargets, defaultTarget, key, scratch);
  44     }
  45 
  46     @Override
  47     public void emitCode(final CompilationResultBuilder crb, final AMD64MacroAssembler masm) {
  48         strategy.run(new HotSpotSwitchClosure(ValueUtil.asRegister(key), crb, masm));
  49     }
  50 
  51     public class HotSpotSwitchClosure extends SwitchClosure {
  52 
  53         protected HotSpotSwitchClosure(Register keyRegister, CompilationResultBuilder crb, AMD64MacroAssembler masm) {
  54             super(keyRegister, crb, masm);
  55         }
  56 
  57         @Override
  58         protected void emitComparison(Constant c) {
  59             if (c instanceof HotSpotMetaspaceConstant) {
  60                 HotSpotMetaspaceConstant meta = (HotSpotMetaspaceConstant) c;
  61                 if (meta.isCompressed()) {
  62                     crb.recordInlineDataInCode(meta);
  63                     masm.cmpl(keyRegister, 0xDEADDEAD);
  64                 } else {
  65                     AMD64Address addr = (AMD64Address) crb.recordDataReferenceInCode(meta, 8);
  66                     masm.cmpq(keyRegister, addr);
  67                 }
  68             } else {
  69                 super.emitComparison(c);
  70             }
  71         }
  72     }
  73 }