1 /*
   2  * Copyright (c) 2000, 2012, 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 sun.jvm.hotspot.code;
  26 
  27 import java.io.*;
  28 import java.util.*;
  29 
  30 import sun.jvm.hotspot.compiler.*;
  31 import sun.jvm.hotspot.debugger.*;
  32 import sun.jvm.hotspot.runtime.*;
  33 import sun.jvm.hotspot.types.*;
  34 import sun.jvm.hotspot.utilities.*;
  35 
  36 public class CodeBlob extends VMObject {
  37   private static AddressField  nameField;
  38   private static CIntegerField sizeField;
  39   private static CIntegerField headerSizeField;
  40   private static CIntegerField relocationSizeField;
  41   private static CIntegerField contentOffsetField;
  42   private static CIntegerField codeOffsetField;
  43   private static CIntegerField frameCompleteOffsetField;
  44   private static CIntegerField dataOffsetField;
  45   private static CIntegerField frameSizeField;
  46   private static AddressField  oopMapsField;
  47 
  48   // Only used by server compiler on x86; computed over in SA rather
  49   // than relying on computation in target VM
  50   private static final int     NOT_YET_COMPUTED = -2;
  51   private static final int     UNDEFINED        = -1;
  52   private              int     linkOffset       = NOT_YET_COMPUTED;
  53   private static       int     matcherInterpreterFramePointerReg;
  54 
  55   static {
  56     VM.registerVMInitializedObserver(new Observer() {
  57         public void update(Observable o, Object data) {
  58           initialize(VM.getVM().getTypeDataBase());
  59         }
  60       });
  61   }
  62 
  63   private static void initialize(TypeDataBase db) {
  64     Type type = db.lookupType("CodeBlob");
  65 
  66     nameField                = type.getAddressField("_name");
  67     sizeField                = type.getCIntegerField("_size");
  68     headerSizeField          = type.getCIntegerField("_header_size");
  69     relocationSizeField      = type.getCIntegerField("_relocation_size");
  70     frameCompleteOffsetField = type.getCIntegerField("_frame_complete_offset");
  71     contentOffsetField       = type.getCIntegerField("_content_offset");
  72     codeOffsetField          = type.getCIntegerField("_code_offset");
  73     dataOffsetField          = type.getCIntegerField("_data_offset");
  74     frameSizeField           = type.getCIntegerField("_frame_size");
  75     oopMapsField             = type.getAddressField("_oop_maps");
  76 
  77     if (VM.getVM().isServerCompiler()) {
  78       matcherInterpreterFramePointerReg =
  79         db.lookupIntConstant("Matcher::interpreter_frame_pointer_reg").intValue();
  80     }
  81   }
  82 
  83   public CodeBlob(Address addr) {
  84     super(addr);
  85   }
  86 
  87   // Typing
  88   public boolean isBufferBlob()         { return false; }
  89   public boolean isNMethod()            { return false; }
  90   public boolean isRuntimeStub()        { return false; }
  91   public boolean isDeoptimizationStub() { return false; }
  92   public boolean isUncommonTrapStub()   { return false; }
  93   public boolean isExceptionStub()      { return false; }
  94   public boolean isSafepointStub()      { return false; }
  95   public boolean isAdapterBlob()        { return false; }
  96 
  97   // Fine grain nmethod support: isNmethod() == isJavaMethod() || isNativeMethod() || isOSRMethod()
  98   public boolean isJavaMethod()         { return false; }
  99   public boolean isNativeMethod()       { return false; }
 100   /** On-Stack Replacement method */
 101   public boolean isOSRMethod()          { return false; }
 102 
 103   public NMethod asNMethodOrNull() {
 104     if (isNMethod()) return (NMethod)this;
 105     return null;
 106   }
 107 
 108   // Boundaries
 109   public Address headerBegin() {
 110     return addr;
 111   }
 112 
 113   public Address headerEnd() {
 114     return addr.addOffsetTo(headerSizeField.getValue(addr));
 115   }
 116 
 117   // FIXME: add RelocInfo
 118   //  public RelocInfo relocationBegin();
 119   //  public RelocInfo relocationEnd();
 120 
 121   public Address contentBegin() {
 122     return headerBegin().addOffsetTo(contentOffsetField.getValue(addr));
 123   }
 124 
 125   public Address contentEnd() {
 126     return headerBegin().addOffsetTo(dataOffsetField.getValue(addr));
 127   }
 128 
 129   public Address codeBegin() {
 130     return headerBegin().addOffsetTo(contentOffsetField.getValue(addr));
 131   }
 132 
 133   public Address codeEnd() {
 134     return headerBegin().addOffsetTo(dataOffsetField.getValue(addr));
 135   }
 136 
 137   public Address dataBegin() {
 138     return headerBegin().addOffsetTo(dataOffsetField.getValue(addr));
 139   }
 140 
 141   public Address dataEnd() {
 142     return headerBegin().addOffsetTo(sizeField.getValue(addr));
 143   }
 144 
 145   // Offsets
 146   public int getRelocationOffset() { return (int) headerSizeField   .getValue(addr); }
 147   public int getContentOffset()    { return (int) contentOffsetField.getValue(addr); }
 148   public int getCodeOffset()       { return (int) codeOffsetField   .getValue(addr); }
 149   public int getDataOffset()       { return (int) dataOffsetField   .getValue(addr); }
 150 
 151   // Sizes
 152   public int getSize()             { return (int) sizeField      .getValue(addr);     }
 153   public int getHeaderSize()       { return (int) headerSizeField.getValue(addr);     }
 154   // FIXME: add getRelocationSize()
 155   public int getContentSize()      { return (int) contentEnd().minus(contentBegin()); }
 156   public int getCodeSize()         { return (int) codeEnd()   .minus(codeBegin());    }
 157   public int getDataSize()         { return (int) dataEnd()   .minus(dataBegin());    }
 158 
 159   // Containment
 160   public boolean blobContains(Address addr)    { return headerBegin() .lessThanOrEqual(addr) && dataEnd()   .greaterThan(addr); }
 161   // FIXME: add relocationContains
 162   public boolean contentContains(Address addr) { return contentBegin().lessThanOrEqual(addr) && contentEnd().greaterThan(addr); }
 163   public boolean codeContains(Address addr)    { return codeBegin()   .lessThanOrEqual(addr) && codeEnd()   .greaterThan(addr); }
 164   public boolean dataContains(Address addr)    { return dataBegin()   .lessThanOrEqual(addr) && dataEnd()   .greaterThan(addr); }
 165   public boolean contains(Address addr)        { return contentContains(addr);                                                  }
 166   public boolean isFrameCompleteAt(Address a)  { return codeContains(a) && a.minus(codeBegin()) >= frameCompleteOffsetField.getValue(addr); }
 167 
 168   // Reclamation support (really only used by the nmethods, but in order to get asserts to work
 169   // in the CodeCache they are defined virtual here)
 170   public boolean isZombie()             { return false; }
 171   public boolean isLockedByVM()         { return false; }
 172 
 173   /** OopMap for frame; can return null if none available */
 174   public OopMapSet getOopMaps() {
 175     Address oopMapsAddr = oopMapsField.getValue(addr);
 176     if (oopMapsAddr == null) {
 177       return null;
 178     }
 179     return new OopMapSet(oopMapsAddr);
 180   }
 181   // FIXME: not yet implementable
 182   //  void set_oop_maps(OopMapSet* p);
 183 
 184   public OopMap getOopMapForReturnAddress(Address returnAddress, boolean debugging) {
 185     Address pc = returnAddress;
 186     if (Assert.ASSERTS_ENABLED) {
 187       Assert.that(getOopMaps() != null, "nope");
 188     }
 189     return getOopMaps().findMapAtOffset(pc.minus(codeBegin()), debugging);
 190   }
 191 
 192   //  virtual void preserve_callee_argument_oops(frame fr, const RegisterMap* reg_map, void f(oop*)) { ShouldNotReachHere(); }
 193   //  FIXME;
 194 
 195   /** NOTE: this returns a size in BYTES in this system! */
 196   public long getFrameSize() {
 197     return VM.getVM().getAddressSize() * frameSizeField.getValue(addr);
 198   }
 199 
 200   // Returns true, if the next frame is responsible for GC'ing oops passed as arguments
 201   public boolean callerMustGCArguments() { return false; }
 202 
 203   public String getName() {
 204     return CStringUtilities.getString(nameField.getValue(addr));
 205   }
 206 
 207   // FIXME: NOT FINISHED
 208 
 209   // FIXME: add more accessors
 210 
 211   public void print() {
 212     printOn(System.out);
 213   }
 214 
 215   public void printOn(PrintStream tty) {
 216     tty.print(getName());
 217     printComponentsOn(tty);
 218   }
 219 
 220   protected void printComponentsOn(PrintStream tty) {
 221     tty.println(" content: [" + contentBegin() + ", " + contentEnd() + "), " +
 222                 " code: [" + codeBegin() + ", " + codeEnd() + "), " +
 223                 " data: [" + dataBegin() + ", " + dataEnd() + "), " +
 224                 " frame size: " + getFrameSize());
 225   }
 226 }
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