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.lir.debug;
  24 
  25 import org.graalvm.compiler.debug.Debug;
  26 import org.graalvm.compiler.lir.LIR;
  27 
  28 import jdk.vm.ci.meta.Value;
  29 
  30 /**
  31  * Provides information about {@link LIR} generation for debugging purposes.
  32  */
  33 public interface LIRGenerationDebugContext {
  34 
  35     /**
  36      * Gets an object that represents the source of an {@link LIR} {@link Value operand} in a higher
  37      * representation.
  38      */
  39     Object getSourceForOperand(Value value);
  40 
  41     static LIRGenerationDebugContext getFromDebugContext() {
  42         if (Debug.isEnabled()) {
  43             LIRGenerationDebugContext lirGen = Debug.contextLookup(LIRGenerationDebugContext.class);
  44             assert lirGen != null;
  45             return lirGen;
  46         }
  47         return null;
  48     }
  49 
  50     static Object getSourceForOperandFromDebugContext(Value value) {
  51         LIRGenerationDebugContext gen = getFromDebugContext();
  52         if (gen != null) {
  53             return gen.getSourceForOperand(value);
  54         }
  55         return null;
  56     }
  57 
  58 }