static Address mapLimit(final int units, final int heads) {
   // final int WORD_SIZE = ArchitecturalWord.getModel().bytesInWord();
   final int WORD_SIZE = 4;
   return baseAddress.plus(
       Math.floorDiv(((units + heads + 1) * WORD_SIZE * 2) + (PAGE_SIZE - 1), PAGE_SIZE)
           * PAGE_SIZE);
 }
Ejemplo n.º 2
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  /**
   * Store a value into a reference field of an object.
   *
   * @param object The object to store the field of.
   * @param index The field index.
   * @param value The value to store.
   */
  public void storeReferenceField(ObjectReference object, int index, ObjectReference value) {
    int limit = ObjectModel.getRefs(object);
    if (Trace.isEnabled(Item.STORE) || ObjectModel.isWatched(object)) {
      Trace.printf(
          Item.STORE,
          "[%s].object[%d/%d] = %s",
          ObjectModel.getString(object),
          index,
          limit,
          value.toString());
    }
    check(!object.isNull(), "Object can not be null");
    check(index >= 0, "Index must be non-negative");
    check(index < limit, "Index " + index + " out of bounds " + limit);

    Address referenceSlot = ObjectModel.getRefSlot(object, index);
    if (ActivePlan.constraints.needsWriteBarrier()) {
      context.writeBarrier(object, referenceSlot, value, null, null, Plan.AASTORE_WRITE_BARRIER);
      if (gcEveryWB) {
        gc();
      }
    } else {
      referenceSlot.store(value);
    }
  }
Ejemplo n.º 3
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 /**
  * Copy numbytes from src to dst. Assumption either the ranges are non overlapping, or src >= dst
  * + 4. Also, src and dst are 4 byte aligned and numBytes is a multiple of 4.
  *
  * @param dst the destination addr
  * @param src the source addr
  * @param numBytes the number of bytes top copy
  */
 @Inline
 public static void aligned32Copy(Address dst, Address src, Offset numBytes) {
   if (USE_NATIVE && numBytes.sGT(Offset.fromIntSignExtend(NATIVE_THRESHOLD))) {
     memcopy(dst, src, numBytes.toWord().toExtent());
   } else {
     if (VM.BuildFor64Addr) {
       Word wordMask = Word.one().lsh(LOG_BYTES_IN_ADDRESS).minus(Word.one());
       Word srcAlignment = src.toWord().and(wordMask);
       if (srcAlignment.EQ(dst.toWord().and(wordMask))) {
         Offset i = Offset.zero();
         if (srcAlignment.EQ(Word.fromIntZeroExtend(BYTES_IN_INT))) {
           dst.store(src.loadInt(i), i);
           i = i.plus(BYTES_IN_INT);
         }
         Word endAlignment =
             srcAlignment.plus(numBytes).and(Word.fromIntSignExtend(BYTES_IN_ADDRESS - 1));
         numBytes = numBytes.minus(endAlignment.toOffset());
         for (; i.sLT(numBytes); i = i.plus(BYTES_IN_ADDRESS)) {
           dst.store(src.loadWord(i), i);
         }
         if (!endAlignment.isZero()) {
           dst.store(src.loadInt(i), i);
         }
         return;
       }
     }
     // normal case: 32 bit or (64 bit not aligned)
     for (Offset i = Offset.zero(); i.sLT(numBytes); i = i.plus(BYTES_IN_INT)) {
       dst.store(src.loadInt(i), i);
     }
   }
 }
Ejemplo n.º 4
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  /**
   * Takes the passed address and (atomically) performs any read barrier actions before returning it
   * as an object.
   *
   * @param tmp The non-zero referent address
   * @return The referent object.
   */
  @Uninterruptible
  @Inline
  Object getInternal() {
    if (RVMType.JavaLangRefReferenceReferenceField.madeTraced()) {
      if (NEEDS_OBJECT_GETFIELD_BARRIER) {
        return Barriers.objectFieldRead(
            this,
            RVMType.JavaLangRefReferenceReferenceField.getOffset(),
            RVMType.JavaLangRefReferenceReferenceField.getId());
      } else {
        return Magic.getObjectAtOffset(
            this,
            RVMType.JavaLangRefReferenceReferenceField.getOffset(),
            RVMType.JavaLangRefReferenceReferenceField.getId());
      }
    } else {
      Address tmp = _referent;
      if (tmp.isZero()) {
        return null;
      } else {
        Object ref = Magic.addressAsObject(tmp);

        if (Barriers.NEEDS_JAVA_LANG_REFERENCE_READ_BARRIER) {
          ref = Barriers.javaLangReferenceReadBarrier(ref);
        }
        return ref;
      }
    }
  }
 /** All Scalars */
 public static void scalar(Object object, TransitiveClosure trace) {
   Address base = Magic.objectAsAddress(object);
   int[] offsets = ObjectModel.getObjectType(object).asClass().getReferenceOffsets();
   for (int i = 0; i < offsets.length; i++) {
     trace.processEdge(ObjectReference.fromObject(object), base.plus(offsets[i]));
   }
 }
  @Inline
  private boolean acquireRecyclableBlockAddressOrder() {
    if (recyclableExhausted) {
      if (VM.VERIFY_ASSERTIONS && Options.verbose.getValue() >= 9) {
        Log.writeln("[no recyclable available]");
      }
      return false;
    }
    int markState = 0;
    boolean usable = false;
    while (!usable) {
      Address next = recyclableBlock.plus(BYTES_IN_BLOCK);
      if (recyclableBlock.isZero() || ImmixSpace.isRecycleAllocChunkAligned(next)) {
        recyclableBlock = space.acquireReusableBlocks();
        if (recyclableBlock.isZero()) {
          recyclableExhausted = true;
          if (VM.VERIFY_ASSERTIONS && Options.verbose.getValue() >= 9) {
            Log.writeln("[recyclable exhausted]");
          }
          line = LINES_IN_BLOCK;
          return false;
        }
      } else {
        recyclableBlock = next;
      }
      markState = Block.getBlockMarkState(recyclableBlock);
      usable = (markState > 0 && markState <= ImmixSpace.getReusuableMarkStateThreshold(copy));
      if (copy && Block.isDefragSource(recyclableBlock)) usable = false;
    }
    if (VM.VERIFY_ASSERTIONS) VM.assertions._assert(!Block.isUnused(recyclableBlock));
    Block.setBlockAsReused(recyclableBlock);

    lineUseCount += (LINES_IN_BLOCK - markState);
    return true; // found something good
  }
 /** Reference Arrays */
 public static void referenceArray(Object object, TransitiveClosure trace) {
   Address base = Magic.objectAsAddress(object);
   int length = ObjectModel.getArrayLength(object);
   for (int i = 0; i < length; i++) {
     trace.processEdge(ObjectReference.fromObject(object), base.plus(i << LOG_BYTES_IN_ADDRESS));
   }
 }
Ejemplo n.º 8
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 /**
  * Test whether a memory range is set to a given integer value
  *
  * @param start The address to start checking at
  * @param bytes The size of the region to check, in bytes
  * @param verbose If true, produce verbose output
  * @param value The value to which the memory should be set
  */
 private static boolean isSet(Address start, int bytes, boolean verbose, int value)
     /* Inlining this loop into the uninterruptible code can
      *  cause/encourage the GCP into moving a get_obj_tib into the
      * interruptible region where the tib is being installed via an
      * int_store
      */
     throws NoInlinePragma {
   if (Assert.VERIFY_ASSERTIONS) assertAligned(bytes);
   for (int i = 0; i < bytes; i += BYTES_IN_INT)
     if (start.loadInt(Offset.fromInt(i)) != value) {
       if (verbose) {
         Log.prependThreadId();
         Log.write("Memory range does not contain only value ");
         Log.writeln(value);
         Log.write("Non-zero range: ");
         Log.write(start);
         Log.write(" .. ");
         Log.writeln(start.add(bytes));
         Log.write("First bad value at ");
         Log.writeln(start.add(i));
         dumpMemory(start, 0, bytes);
       }
       return false;
     }
   return true;
 }
 /**
  * Push an address onto the address stack.
  *
  * @param object the object to be pushed onto the object queue
  */
 @Inline
 public final void push(ObjectReference object) {
   Address addr = object.toAddress();
   if (VM.VERIFY_ASSERTIONS) VM.assertions._assert(!addr.isZero());
   checkHeadInsert(1);
   uncheckedHeadInsert(addr);
 }
Ejemplo n.º 10
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 /**
  * Set a region of memory
  *
  * @param start The start of the region to be zeroed (must be 4-byte aligned)
  * @param bytes The number of bytes to be zeroed (must be 4-byte aligned)
  * @param value The value to which the integers in the region should be set
  */
 public static void set(Address start, int bytes, int value) throws InlinePragma {
   if (Assert.VERIFY_ASSERTIONS) {
     assertAligned(start);
     assertAligned(bytes);
   }
   Address end = start.add(bytes);
   for (Address addr = start; addr.LT(end); addr = addr.add(BYTES_IN_INT)) addr.store(value);
 }
Ejemplo n.º 11
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 /**
  * Zero a small region of memory
  *
  * @param start The start of the region to be zeroed (must be 4-byte aligned)
  * @param bytes The number of bytes to be zeroed (must be 4-byte aligned)
  */
 public static void zeroSmall(Address start, Extent bytes) throws InlinePragma {
   if (Assert.VERIFY_ASSERTIONS) {
     assertAligned(start);
     assertAligned(bytes);
   }
   Address end = start.add(bytes);
   for (Address addr = start; addr.LT(end); addr = addr.add(BYTES_IN_INT)) addr.store(0);
 }
Ejemplo n.º 12
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 /**
  * Given a slot (ie the address of an ObjectReference), ensure that the referent will not move for
  * the rest of the GC. This is achieved by calling the precopyObject method.
  *
  * @param slot The slot to check
  */
 @Inline
 public final void processPrecopyEdge(Address slot) {
   ObjectReference child = slot.loadObjectReference();
   if (!child.isNull()) {
     child = precopyObject(child);
     slot.store(child);
   }
 }
Ejemplo n.º 13
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 /** Called after we've successfully loaded the shared library */
 private void callOnLoad() {
   // Run any JNI_OnLoad functions defined within the library
   Address JNI_OnLoadAddress = getSymbol("JNI_OnLoad");
   if (!JNI_OnLoadAddress.isZero()) {
     int version = runJNI_OnLoad(JNI_OnLoadAddress);
     checkJNIVersion(version);
   }
 }
Ejemplo n.º 14
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 /**
  * Resolve a symbol to an address in a currently loaded dynamic library.
  *
  * @return the address of the symbol of Address.zero() if it cannot be resolved
  */
 public static synchronized Address resolveSymbol(String symbol) {
   for (VM_DynamicLibrary lib : dynamicLibraries.values()) {
     Address symbolAddress = lib.getSymbol(symbol);
     if (!symbolAddress.isZero()) {
       return symbolAddress;
     }
   }
   return Address.zero();
 }
Ejemplo n.º 15
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 /** Sweep through the large pages, releasing all superpages on the "from space" treadmill. */
 private void sweepLargePages(boolean sweepNursery) {
   while (true) {
     Address cell = sweepNursery ? treadmill.popNursery() : treadmill.pop();
     if (cell.isZero()) break;
     release(getSuperPage(cell));
   }
   if (VM.VERIFY_ASSERTIONS)
     VM.assertions._assert(sweepNursery ? treadmill.nurseryEmpty() : treadmill.fromSpaceEmpty());
 }
Ejemplo n.º 16
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  /**
   * Store a value into the data field of an object.
   *
   * @param object The object to store the field of.
   * @param index The field index.
   * @param value The value to store.
   */
  public void storeDataField(ObjectReference object, int index, int value) {
    int limit = ObjectModel.getDataCount(object);
    check(!object.isNull(), "Object can not be null");
    check(index >= 0, "Index must be non-negative");
    check(index < limit, "Index " + index + " out of bounds " + limit);

    Address ref = ObjectModel.getDataSlot(object, index);
    ref.store(value);
    Trace.trace(Item.STORE, "%s.[%d] = %d", object.toString(), index, value);
  }
Ejemplo n.º 17
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 /**
  * Demand zero mmaps an area of virtual memory.
  *
  * @param start the address of the start of the area to be mapped
  * @param size the size, in bytes, of the area to be mapped
  * @return 0 if successful, otherwise the system errno
  */
 public final int dzmmap(Address start, int size) {
   Address result = org.jikesrvm.runtime.Memory.dzmmap(start, Extent.fromIntZeroExtend(size));
   if (result.EQ(start)) return 0;
   if (result.GT(Address.fromIntZeroExtend(127))) {
     VM.sysWrite("demand zero mmap with MAP_FIXED on ", start);
     VM.sysWriteln(" returned some other address", result);
     VM.sysFail("mmap with MAP_FIXED has unexpected behavior");
   }
   return result.toInt();
 }
Ejemplo n.º 18
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  public EEPRO100TxFD(ResourceManager rm) {
    // Create a large enough buffer
    final int size = (TxFDSize + DataBufferSize) + 16 /* alignment */;
    this.data = new byte[size];
    this.mem = rm.asMemoryResource(data);

    final Address memAddr = mem.getAddress();

    this.firstDPDOffset = 0;
    this.firstDPDAddress = memAddr.add(firstDPDOffset);
  }
Ejemplo n.º 19
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  /**
   * Load and return the value of a data field of an object.
   *
   * @param object The object to load the field of.
   * @param index The field index.
   */
  public int loadDataField(ObjectReference object, int index) {
    int limit = ObjectModel.getDataCount(object);
    check(!object.isNull(), "Object can not be null");
    check(index >= 0, "Index must be non-negative");
    check(index < limit, "Index " + index + " out of bounds " + limit);

    Address dataSlot = ObjectModel.getDataSlot(object, index);
    int result = dataSlot.loadInt();
    Trace.trace(
        Item.LOAD, "[%s].int[%d] returned [%d]", ObjectModel.getString(object), index, result);
    return result;
  }
Ejemplo n.º 20
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 /**
  * Low level copy of <code>copyBytes</code> bytes from <code>src[srcPos]</code> to <code>
  * dst[dstPos]</code>.
  *
  * <p>Assumption <code>src != dst || (srcPos >= dstPos)</code> and element size is 8 bytes.
  *
  * @param dstPtr The destination start address
  * @param srcPtr The source start address
  * @param copyBytes The number of bytes to be copied
  */
 public static void aligned64Copy(Address dstPtr, Address srcPtr, int copyBytes) {
   if (USE_NATIVE && copyBytes > NATIVE_THRESHOLD) {
     memcopy(dstPtr, srcPtr, copyBytes);
   } else {
     // The elements of long[] and double[] are always doubleword aligned
     // therefore we can do 64 bit load/stores without worrying about alignment.
     Address endPtr = srcPtr.plus(copyBytes);
     while (srcPtr.LT(endPtr)) {
       copy8Bytes(dstPtr, srcPtr);
       srcPtr = srcPtr.plus(8);
       dstPtr = dstPtr.plus(8);
     }
   }
 }
Ejemplo n.º 21
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  // return (address of) next ref in the current "frame" on the
  // threads JNIEnvironment stack of refs
  // When at the end of the current frame, update register locations to point
  // to the non-volatile registers saved in the JNI transition frame.
  //
  public Address getNextReferenceAddress() {
    // first report jni refs in the current frame in the jniRef side stack
    // until all in the frame are reported
    //
    if (jniNextRef > jniFramePtr) {
      Address ref_address = Magic.objectAsAddress(jniRefs).plus(jniNextRef);
      jniNextRef -= BYTES_IN_ADDRESS;
      return ref_address;
    }

    // no more refs to report, before returning 0, setup for processing
    // the next jni frame, if any

    // jniNextRef -> savedFramePtr for another "frame" of refs for another
    // sequence of Native C frames lower in the stack, or to 0 if this is the
    // last jni frame in the JNIRefs stack.  If more frames, initialize for a
    // later scan of those refs.
    //
    if (jniFramePtr > 0) {
      jniFramePtr = jniRefs.get(jniFramePtr >> LOG_BYTES_IN_ADDRESS).toInt();
      jniNextRef = jniNextRef - BYTES_IN_ADDRESS;
    }

    // set register locations for non-volatiles to point to registers saved in
    // the JNI transition frame at a fixed negative offset from the callers FP.
    // the save non-volatiles are EBX EBP and EDI.
    //
    registerLocations.set(EDI.value(), framePtr.plus(JNICompiler.EDI_SAVE_OFFSET));
    registerLocations.set(EBX.value(), framePtr.plus(JNICompiler.EBX_SAVE_OFFSET));
    registerLocations.set(EBP.value(), framePtr.plus(JNICompiler.EBP_SAVE_OFFSET));

    return Address.zero(); // no more refs to report
  }
 private void zeroBlock(Address block) {
   // FIXME: efficiency check here!
   if (VM.VERIFY_ASSERTIONS)
     VM.assertions._assert(
         block.toWord().and(Word.fromIntSignExtend(BYTES_IN_BLOCK - 1)).isZero());
   VM.memory.zero(block, Extent.fromIntZeroExtend(BYTES_IN_BLOCK));
 }
Ejemplo n.º 23
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  public static void dumpMemory(Address start, int beforeBytes, int afterBytes) {

    beforeBytes = alignDown(beforeBytes, BYTES_IN_ADDRESS);
    afterBytes = alignUp(afterBytes, BYTES_IN_ADDRESS);
    VM.sysWrite("---- Dumping memory from ");
    VM.sysWrite(start.minus(beforeBytes));
    VM.sysWrite(" to ");
    VM.sysWrite(start.plus(afterBytes));
    VM.sysWrite(" ----\n");
    for (int i = -beforeBytes; i < afterBytes; i += BYTES_IN_ADDRESS) {
      VM.sysWrite(i, ": ");
      VM.sysWrite(start.plus(i));
      Word value = start.plus(i).loadWord();
      VM.sysWriteln("  ", value);
    }
  }
Ejemplo n.º 24
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 /**
  * Gets the compiled code of a given stackframe.
  *
  * @param sf Stackframe pointer
  * @return The compiled code
  */
 final VmCompiledCode getCompiledCode(Address sf) {
   final int ccid = sf.loadInt(getMethodIdOffset(sf));
   if (ccid == 0) {
     return null;
   } else {
     return VmUtils.getVm().getCompiledMethods().get(ccid);
   }
 }
Ejemplo n.º 25
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 @Inline
 public static Address alignUp(Address address, int alignment) {
   return address
       .plus(alignment - 1)
       .toWord()
       .and(Word.fromIntSignExtend(~(alignment - 1)))
       .toAddress();
 }
Ejemplo n.º 26
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 /**
  * Pop an address from the address stack, return zero if the stack is empty.
  *
  * @return The next address in the address stack, or zero if the stack is empty
  */
 @Inline
 public final Address pop() {
   if (checkDequeue(1)) {
     return uncheckedDequeue();
   } else {
     return Address.zero();
   }
 }
  /**
   * Allocate space for a new object. This is frequently executed code and the coding is
   * deliberaetly sensitive to the optimizing compiler. After changing this, always check the IR/MC
   * that is generated.
   *
   * @param bytes The number of bytes allocated
   * @param align The requested alignment
   * @param offset The offset from the alignment
   * @return The address of the first byte of the allocated region
   */
  @Inline
  public final Address alloc(int bytes, int align, int offset) {
    /* establish how much we need */
    Address start = alignAllocationNoFill(cursor, align, offset);
    Address end = start.plus(bytes);

    /* check whether we've exceeded the limit */
    if (end.GT(limit)) {
      if (bytes > BYTES_IN_LINE) return overflowAlloc(bytes, align, offset);
      else return allocSlowHot(bytes, align, offset);
    }

    /* sufficient memory is available, so we can finish performing the allocation */
    fillAlignmentGap(cursor, start);
    cursor = end;

    return start;
  }
Ejemplo n.º 28
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 /**
  * Gets the previous frame (if any)
  *
  * @param sf The stackframe to get the previous frame from.
  * @return The previous frame or null.
  */
 @KernelSpace
 @Internal
 public final Address getPrevious(Address sf) {
   if (isValid(sf)) {
     return sf.loadAddress(getPreviousOffset(sf));
   } else {
     return null;
   }
 }
Ejemplo n.º 29
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 /**
  * Trace a reference during GC. This involves determining which collection policy applies and
  * calling the appropriate <code>trace</code> method.
  *
  * @param target The object the interior edge points within.
  * @param slot The location of the interior edge.
  * @param root True if this is a root edge.
  */
 public final void processInteriorEdge(ObjectReference target, Address slot, boolean root) {
   Address interiorRef = slot.loadAddress();
   Offset offset = interiorRef.diff(target.toAddress());
   ObjectReference newTarget = traceObject(target, root);
   if (VM.VERIFY_ASSERTIONS) {
     if (offset.sLT(Offset.zero()) || offset.sGT(Offset.fromIntSignExtend(1 << 24))) {
       // There is probably no object this large
       Log.writeln("ERROR: Suspiciously large delta to interior pointer");
       Log.write("       object base = ");
       Log.writeln(target);
       Log.write("       interior reference = ");
       Log.writeln(interiorRef);
       Log.write("       delta = ");
       Log.writeln(offset);
       VM.assertions._assert(false);
     }
   }
   slot.store(newTarget.toAddress().plus(offset));
 }
  /**
   * Allocate space for a new object. This is frequently executed code and the coding is
   * deliberaetly sensitive to the optimizing compiler. After changing this, always check the IR/MC
   * that is generated.
   *
   * @param bytes The number of bytes allocated
   * @param align The requested alignment
   * @param offset The offset from the alignment
   * @return The address of the first byte of the allocated region
   */
  public final Address overflowAlloc(int bytes, int align, int offset) {
    /* establish how much we need */
    Address start = alignAllocationNoFill(largeCursor, align, offset);
    Address end = start.plus(bytes);

    /* check whether we've exceeded the limit */
    if (end.GT(largeLimit)) {
      requestForLarge = true;
      Address rtn = allocSlowInline(bytes, align, offset);
      requestForLarge = false;
      return rtn;
    }

    /* sufficient memory is available, so we can finish performing the allocation */
    fillAlignmentGap(largeCursor, start);
    largeCursor = end;

    return start;
  }