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 Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
  20  * CA 95054 USA or visit www.sun.com if you need additional information or
  21  * have any questions.
  22  *
  23  */
  24 
  25 package sun.jvm.hotspot.asm;
  26 
  27 public abstract class Disassembler {





































  28    protected long   startPc;
  29    protected byte[] code;


  30 
  31    public Disassembler(long startPc, byte[] code) {














  32       this.startPc = startPc;
  33       this.code = code;




  34    }

  35 
  36    public long getStartPC() {
  37       return startPc;







  38    }
  39 
  40    public byte[] getCode() {
  41       return code;





  42    }
  43 
  44    public abstract void decode(InstructionVisitor visitor);































  45 }

   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 Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
  20  * CA 95054 USA or visit www.sun.com if you need additional information or
  21  * have any questions.
  22  *
  23  */
  24 
  25 package sun.jvm.hotspot.asm;
  26 
  27 import java.io.PrintStream;
  28 import java.util.Observer;
  29 import java.util.Observable;
  30 import sun.jvm.hotspot.code.CodeBlob;
  31 import sun.jvm.hotspot.code.NMethod;
  32 import sun.jvm.hotspot.debugger.Address;
  33 import sun.jvm.hotspot.runtime.VM;
  34 
  35 public class Disassembler {
  36    static final int COMMENT_COLUMN = 40;
  37    static final String BYTES_COMMENT =  ";...";  /* funky byte display comment */
  38 
  39    private static String libname;
  40    private static String options;
  41    private static long decode_function;
  42 
  43    static {
  44       VM.registerVMInitializedObserver(new Observer() {
  45          public void update(Observable o, Object data) {
  46             options = "";
  47             libname = null;
  48             String cpu = VM.getVM().getCPU();
  49             if (cpu.equals("sparc")) {
  50                libname = "hsdis-sparc";
  51                if (VM.getVM().isLP64()) {
  52                   options = "v9only";
  53                }
  54             } else if (cpu.equals("x86")) {
  55                libname = "hsdis-i386";
  56             } else if (cpu.equals("amd64")) {
  57                libname = "hsdis-amd64";
  58             } else if (cpu.equals("ia64")) {
  59                libname = "hsdis-ia64";
  60             }
  61          }
  62       });
  63    }
  64 
  65    protected long   startPc;
  66    protected byte[] code;
  67    private CodeBlob blob;
  68    private NMethod nmethod;
  69 
  70    public static void decode(InstructionVisitor visitor, CodeBlob blob) {
  71       decode(visitor, blob, blob.instructionsBegin(), blob.instructionsEnd());
  72    }
  73 
  74    public static void decode(InstructionVisitor visitor, CodeBlob blob, Address begin, Address end) {
  75       int codeSize = (int)end.minus(begin);
  76       long startPc = VM.getAddressValue(begin);
  77       byte[] code = new byte[codeSize];
  78       for (int i = 0; i < code.length; i++)
  79          code[i] = begin.getJByteAt(i);
  80       Disassembler dis = new Disassembler(startPc, code);
  81       dis.decode(visitor);
  82    }
  83 
  84    private Disassembler(long startPc, byte[] code) {
  85       this.startPc = startPc;
  86       this.code = code;
  87 
  88       // Lazily load hsdis
  89       if (decode_function == 0) {
  90          decode_function = load_library(libname);
  91       }
  92    }
  93 
  94    private static native long load_library(String hsdis_library_name);
  95 
  96    private native void decode(InstructionVisitor visitor, long pc, byte[] code,
  97                               String options, long decode_function);
  98 
  99    private void decode(InstructionVisitor visitor) {
 100       visitor.prologue();
 101       decode(visitor, startPc, code, options, decode_function);
 102       visitor.epilogue();
 103    }
 104 
 105    private boolean match(String event, String tag) {
 106       if (!event.startsWith(tag))
 107          return false;
 108       int taglen = tag.length();
 109       if (taglen == event.length()) return true;
 110       char delim = event.charAt(taglen);
 111       return delim == ' ' || delim == '/' || delim == '=';
 112    }
 113 
 114    // This is called from the native code to process various markers
 115    // in the dissassembly.
 116    private long handleEvent(InstructionVisitor visitor, String event, long arg) {
 117       if (match(event, "insn")) {
 118          try {
 119             visitor.beginInstruction(arg);
 120          } catch (Throwable e) {
 121             e.printStackTrace();
 122          }
 123       } else if (match(event, "/insn")) {
 124          try {
 125             visitor.endInstruction(arg);
 126          } catch (Throwable e) {
 127             e.printStackTrace();
 128          }
 129       } else if (match(event, "addr")) {
 130          if (arg != 0) {
 131             visitor.printAddress(arg);
 132          }
 133          return arg;
 134       } else if (match(event, "mach")) {
 135          // output().printf("[Disassembling for mach='%s']\n", arg);
 136       } else {
 137          // ignore unrecognized markup
 138       }
 139       return 0;
 140    }
 141 
 142    // This called from the native code to perform printing
 143    private  void rawPrint(InstructionVisitor visitor, String s) {
 144       visitor.print(s);
 145    }
 146 }