1 /*
   2  * Copyright (c) 2013, 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.lir.sparc;
  26 
  27 import static org.graalvm.compiler.asm.sparc.SPARCAssembler.BPCC;
  28 import static org.graalvm.compiler.asm.sparc.SPARCAssembler.Annul.NOT_ANNUL;
  29 import static org.graalvm.compiler.asm.sparc.SPARCAssembler.BranchPredict.PREDICT_TAKEN;
  30 import static org.graalvm.compiler.asm.sparc.SPARCAssembler.CC.Xcc;
  31 import static org.graalvm.compiler.asm.sparc.SPARCAssembler.ConditionFlag.Always;
  32 
  33 import org.graalvm.compiler.asm.sparc.SPARCMacroAssembler;
  34 import org.graalvm.compiler.lir.LIRInstructionClass;
  35 import org.graalvm.compiler.lir.LabelRef;
  36 import org.graalvm.compiler.lir.StandardOp.JumpOp;
  37 import org.graalvm.compiler.lir.asm.CompilationResultBuilder;
  38 
  39 public final class SPARCJumpOp extends JumpOp implements SPARCDelayedControlTransfer, SPARCLIRInstructionMixin {
  40     public static final LIRInstructionClass<SPARCJumpOp> TYPE = LIRInstructionClass.create(SPARCJumpOp.class);
  41     public static final SizeEstimate SIZE = SizeEstimate.create(2);
  42 
  43     private boolean emitDone = false;
  44     private int delaySlotPosition = -1;
  45     private final SPARCLIRInstructionMixinStore store;
  46 
  47     public SPARCJumpOp(LabelRef destination) {
  48         super(TYPE, destination);
  49         this.store = new SPARCLIRInstructionMixinStore(SIZE);
  50     }
  51 
  52     @Override
  53     public void emitControlTransfer(CompilationResultBuilder crb, SPARCMacroAssembler masm) {
  54         assert !emitDone;
  55         if (!crb.isSuccessorEdge(destination())) {
  56             BPCC.emit(masm, Xcc, Always, NOT_ANNUL, PREDICT_TAKEN, destination().label());
  57             delaySlotPosition = masm.position();
  58         }
  59         emitDone = true;
  60     }
  61 
  62     @Override
  63     public void emitCode(CompilationResultBuilder crb) {
  64         if (!crb.isSuccessorEdge(destination())) {
  65             if (!emitDone) {
  66                 SPARCMacroAssembler masm = (SPARCMacroAssembler) crb.asm;
  67                 masm.jmp(destination().label());
  68             } else {
  69                 int disp = crb.asm.position() - delaySlotPosition;
  70                 assert disp == 4 : disp;
  71             }
  72         }
  73     }
  74 
  75     @Override
  76     public void resetState() {
  77         delaySlotPosition = -1;
  78         emitDone = false;
  79     }
  80 
  81     @Override
  82     public SPARCLIRInstructionMixinStore getSPARCLIRInstructionStore() {
  83         return store;
  84     }
  85 }