1 /*
   2  * Copyright (c) 2014, 2014, 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.lir.constopt;
  24 
  25 import org.graalvm.compiler.core.common.cfg.AbstractBlockBase;
  26 import org.graalvm.compiler.lir.LIRInstruction;
  27 import org.graalvm.compiler.lir.ValueProcedure;
  28 
  29 import jdk.vm.ci.meta.Value;
  30 
  31 /**
  32  * Represents a usage of a constant.
  33  */
  34 class UseEntry {
  35 
  36     private final AbstractBlockBase<?> block;
  37     private final LIRInstruction instruction;
  38     private final Value value;
  39 
  40     UseEntry(AbstractBlockBase<?> block, LIRInstruction instruction, Value value) {
  41         this.block = block;
  42         this.instruction = instruction;
  43         this.value = value;
  44     }
  45 
  46     public LIRInstruction getInstruction() {
  47         return instruction;
  48     }
  49 
  50     public AbstractBlockBase<?> getBlock() {
  51         return block;
  52     }
  53 
  54     public void setValue(Value newValue) {
  55         replaceValue(instruction, value, newValue);
  56     }
  57 
  58     private static void replaceValue(LIRInstruction op, Value oldValue, Value newValue) {
  59         ValueProcedure proc = (value, mode, flags) -> value.identityEquals(oldValue) ? newValue : value;
  60         op.forEachAlive(proc);
  61         op.forEachInput(proc);
  62         op.forEachOutput(proc);
  63         op.forEachTemp(proc);
  64         op.forEachState(proc);
  65     }
  66 
  67     public Value getValue() {
  68         return value;
  69     }
  70 
  71     @Override
  72     public String toString() {
  73         return "Use[" + getValue() + ":" + instruction + ":" + block + "]";
  74     }
  75 
  76 }