org.jikesrvm.compilers.opt.runtimesupport
Class OptMachineCodeMap

java.lang.Object
  org.jikesrvm.compilers.opt.runtimesupport.OptMachineCodeMap

All Implemented Interfaces:

OptConstants, Constants, HeapLayoutConstants, ThinLockConstants, TIBLayoutConstants, SizeConstants

public final class OptMachineCodeMap
extends Object
implements Constants, OptConstants

A class that encapsulates mapping information about generated machine code. Since there will be an instance of this class with every OptCompiledMethod, we attempt to pack the data into a reasonably small number of bits.

The supported functions are:

• (1) Map from a machine code offset to a GC map (register & stack map).
• (2) Map from machinecode offset to pair. Used for:
  • dynamic linking
  • lazy compilation
  • adaptive system profiling
• (3) Map from a machine code offset to a tree of pairs that encodes the inlining sequence. Used for:
  • IPA
  • stack inspection (print stack trace, security manager, etc).
  • general debugging support.
  • adaptive system profiling
  Note: This file contains two types of methods 1) methods called during compilation to create the maps 2) methods called at GC time (no allocation allowed!)

  ---

  Field Summary
  private static int	BCI_MASK
  private static int	BCI_SHIFT
  private static int	BIG_BCI_IDX_ADJ
  private static int	BIG_BCI_MASK
  private static int	BIG_BCI_SHIFT
  private static int	BIG_CALL_IDX_ADJ
  private static int	BIG_CALL_MASK
  private static int	BIG_CALL_SHIFT
  private static int	BIG_GCI_IDX_ADJ
  private static int	BIG_GCI_MASK
  private static int	BIG_GCI_SHIFT
  private static int	BIG_IEI_IDX_ADJ
  private static int	BIG_IEI_MASK
  private static int	BIG_IEI_SHIFT
  private static int	BIG_INVALID_BCI
  private static int	BIG_INVALID_GCI
  private static int	BIG_INVALID_IEI
  private static int	BIG_OFFSET_IDX_ADJ
  private static int	BIG_OFFSET_MASK
  private static int	BIG_OFFSET_SHIFT
  private static int	CALL_MASK
  private static int	CALL_SHIFT
  private static OptMachineCodeMap	emptyMachineCodeMap           A machine code map when no information is present
  private static int	GCI_MASK
  private static int	GCI_SHIFT
  private  int[]	gcMaps           array of GC maps as defined by OptGCMap
  private static int	HUGE_BCI_IDX_ADJ
  private static int	HUGE_BCI_MASK
  private static int	HUGE_BCI_SHIFT
  private static int	HUGE_CALL_IDX_ADJ
  private static int	HUGE_CALL_MASK
  private static int	HUGE_CALL_SHIFT
  private static int	HUGE_GCI_IDX_ADJ
  private static int	HUGE_GCI_MASK
  private static int	HUGE_GCI_SHIFT
  private static int	HUGE_IEI_IDX_ADJ
  private static int	HUGE_IEI_MASK
  private static int	HUGE_IEI_SHIFT
  private static int	HUGE_INVALID_BCI
  private static int	HUGE_INVALID_GCI
  private static int	HUGE_INVALID_IEI
  private static int	HUGE_OFFSET_IDX_ADJ
  private static int	HUGE_OFFSET_MASK
  private static int	HUGE_OFFSET_SHIFT
  private static int	IEI_MASK
  private static int	IEI_SHIFT
  int[]	inlineEncoding           encoded data as defined by OptEncodedCallSiteTree.
  private static int	INVALID_BCI
  private static int	INVALID_GCI
  private static int	INVALID_IEI
  private static int	IS_GUARDED_CALL
  private static int	IS_UNGUARDED_CALL
  private  int[]	MCInformation           Hold entries as defined by the constants above.
  private static int	OFFSET_MASK
  private static int	OFFSET_SHIFT
  private static int	SIZEOF_BIG_ENTRY
  private static int	SIZEOF_ENTRY
  private static int	SIZEOF_HUGE_ENTRY
  private static int	START_BITS
  private static int	START_OF_BIG_ENTRY
  private static int	START_OF_ENTRY
  private static int	START_OF_HUGE_ENTRY
  private static int	totalMapSize
  private static int	totalMCSize           Running totals for the size of machine code and maps
  private static TypeReference	TYPE

   

  Fields inherited from interface org.jikesrvm.Constants
  NOT_REACHED, REFLECTION_FPRS_BITS, REFLECTION_FPRS_MASK, REFLECTION_GPRS_BITS, REFLECTION_GPRS_MASK

   

  Fields inherited from interface org.jikesrvm.objectmodel.ThinLockConstants
  TL_DEDICATED_U16_OFFSET, TL_DEDICATED_U16_SHIFT, TL_LOCK_COUNT_MASK, TL_LOCK_COUNT_SHIFT, TL_LOCK_COUNT_UNIT, TL_LOCK_ID_MASK, TL_LOCK_ID_SHIFT, TL_NUM_BITS_RC, TL_NUM_BITS_STAT, TL_NUM_BITS_TID, TL_STAT_BIASABLE, TL_STAT_FAT, TL_STAT_MASK, TL_STAT_SHIFT, TL_STAT_THIN, TL_THREAD_ID_MASK, TL_THREAD_ID_SHIFT, TL_UNLOCK_MASK

   

  Fields inherited from interface org.jikesrvm.SizeConstants

  BITS_IN_ADDRESS, BITS_IN_BOOLEAN, BITS_IN_BYTE, BITS_IN_CHAR, BITS_IN_DOUBLE, BITS_IN_EXTENT, BITS_IN_FLOAT, BITS_IN_INT, BITS_IN_LONG, BITS_IN_OFFSET, BITS_IN_PAGE, BITS_IN_SHORT, BITS_IN_WORD, BYTES_IN_ADDRESS, BYTES_IN_BOOLEAN, BYTES_IN_BYTE, BYTES_IN_CHAR, BYTES_IN_DOUBLE, BYTES_IN_EXTENT, BYTES_IN_FLOAT, BYTES_IN_INT, BYTES_IN_LONG, BYTES_IN_OFFSET, BYTES_IN_PAGE, BYTES_IN_SHORT, BYTES_IN_WORD, LOG_BITS_IN_ADDRESS, LOG_BITS_IN_BOOLEAN, LOG_BITS_IN_BYTE, LOG_BITS_IN_CHAR, LOG_BITS_IN_DOUBLE, LOG_BITS_IN_EXTENT, LOG_BITS_IN_FLOAT, LOG_BITS_IN_INT, LOG_BITS_IN_LONG, LOG_BITS_IN_OFFSET, LOG_BITS_IN_PAGE, LOG_BITS_IN_SHORT, LOG_BITS_IN_WORD, LOG_BYTES_IN_ADDRESS, LOG_BYTES_IN_BOOLEAN, LOG_BYTES_IN_BYTE, LOG_BYTES_IN_CHAR, LOG_BYTES_IN_DOUBLE, LOG_BYTES_IN_EXTENT, LOG_BYTES_IN_FLOAT, LOG_BYTES_IN_INT, LOG_BYTES_IN_LONG, LOG_BYTES_IN_OFFSET, LOG_BYTES_IN_PAGE, LOG_BYTES_IN_SHORT, LOG_BYTES_IN_WORD

   

  Fields inherited from interface org.jikesrvm.objectmodel.TIBLayoutConstants
  IMT_METHOD_SLOTS, NEEDS_DYNAMIC_LINK, TIB_ARRAY_ELEMENT_TIB_INDEX, TIB_DOES_IMPLEMENT_INDEX, TIB_FIRST_SPECIALIZED_METHOD_INDEX, TIB_FIRST_VIRTUAL_METHOD_INDEX, TIB_INTERFACE_DISPATCH_TABLE_INDEX, TIB_SUPERCLASS_IDS_INDEX, TIB_TYPE_INDEX

   

  Fields inherited from interface org.jikesrvm.HeapLayoutConstants
  BAD_MAP_COMPRESSION, BOOT_IMAGE_CODE_END, BOOT_IMAGE_CODE_SIZE, BOOT_IMAGE_CODE_START, BOOT_IMAGE_DATA_END, BOOT_IMAGE_DATA_SIZE, BOOT_IMAGE_DATA_START, BOOT_IMAGE_END, BOOT_IMAGE_RMAP_END, BOOT_IMAGE_RMAP_START, MAX_BOOT_IMAGE_RMAP_SIZE, MAXIMUM_MAPPABLE

   

  Fields inherited from interface org.jikesrvm.compilers.opt.driver.OptConstants
  EPILOGUE_BCI, EPILOGUE_BLOCK_BCI, EXTANT_ANALYSIS_BCI, INSTRUMENTATION_BCI, MAYBE, METHOD_COUNTER_BCI, NO, OSR_PROLOGUE, PROLOGUE_BCI, PROLOGUE_BLOCK_BCI, RECTIFY_BCI, RUNTIME_SERVICES_BCI, SSA_SYNTH_BCI, SYNCHRONIZED_MONITORENTER_BCI, SYNCHRONIZED_MONITOREXIT_BCI, SYNTH_CATCH_BCI, SYNTH_LOOP_VERSIONING_BCI, UNKNOWN_BCI, YES

   

  Constructor Summary
  private	OptMachineCodeMap()           Private null constructor for no information
  private	OptMachineCodeMap(int[] _MCInformation, int[] _gcMaps, int[] _inlineEncoding)           Private constructor, object should be created via create

   

  Method Summary
  (package private) static OptMachineCodeMap	create(IR ir, int machineCodeSize)           Create the map, called during compilation
  void	dumpMCInformation(boolean DUMP_MAPS)
  int	findGCMapIndex(Offset MCOffset)           This method searches for the GC map corresponding to the passed machine code offset.
  private  int	findMCEntry(Offset MCOffset)           Do a binary search of the machine code maps to find the index in MCInformation where the entry for the argument machine code offset starts.
  int	gcMapInformation(int index)           Returns the GC map information for the GC map information entry passed
  private static OptMachineCodeMap	generateMCInformation(GCIRMap irMap, boolean DUMP_MAPS)           This method walks the IR map, and for each entry it creates the machine code mapping information for the entry.
  private  int	getBytecodeIndex(int entry)           Returns the Bytecode index for the entry passed
  int	getBytecodeIndexForMCOffset(Offset MCOffset)           Get the bytecode index for a machine instruction offset.
  private  int	getCallInfo(int entry)           Returns the call info for the entry passed.
  private  int	getGCMapIndex(int entry)           Returns the GC map index for the entry passed
  int	getInlineEncodingForMCOffset(Offset MCOffset)           Return the inlining encoding index for the machine instruction offset.
  private  int	getInlineEncodingIndex(int entry)           Returns the inline encoding index for the entry passed.
  private  int	getMCOffset(int entry)           Returns the MCOffset for the entry passed
  NormalMethod	getMethodForMCOffset(Offset MCOffset)           Get the RVMMethod for a machine instruction offset.
  ArrayList<CallSite>	getNonInlinedCallSites()
  boolean	hasInlinedEdge(RVMMethod caller, int bcIndex, RVMMethod callee)           This method searches the machine code maps and determines if the given call edge is definitely inlined into the method.
  private  boolean	isBigEntry(int entry)           Is the entry a big entry?
  private  boolean	isHugeEntry(int entry)           Is the entry a big entry?
  private  int	nextEntry(int entry)
  int	nextLocation(int currentIndex)
  private  void	printMCInformationEntry(int entry, boolean DUMP_MAPS)           Prints the MCInformation for this entry
  private  void	recordStats(RVMMethod method, int mapSize, int machineCodeSize, boolean DUMP_MAP_SIZES)           Gather cumulative stats about the space consumed by maps.
  boolean	registerIsSet(int entry, int registerNumber)           Determines if the register map information for the entry passed is true
  (package private)  int	size()           Total bytes of machine code maps

   

  Methods inherited from class java.lang.Object
  clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

   

  Field Detail

  START_OF_ENTRY

  private static final int START_OF_ENTRY

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  START_OF_BIG_ENTRY

  private static final int START_OF_BIG_ENTRY

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  START_OF_HUGE_ENTRY

  private static final int START_OF_HUGE_ENTRY

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  START_BITS

  private static final int START_BITS

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  CALL_MASK

  private static final int CALL_MASK

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  CALL_SHIFT

  private static final int CALL_SHIFT

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  BCI_MASK

  private static final int BCI_MASK

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  BCI_SHIFT

  private static final int BCI_SHIFT

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  IEI_MASK

  private static final int IEI_MASK

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  IEI_SHIFT

  private static final int IEI_SHIFT

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  GCI_MASK

  private static final int GCI_MASK

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  GCI_SHIFT

  private static final int GCI_SHIFT

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  OFFSET_MASK

  private static final int OFFSET_MASK

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  OFFSET_SHIFT

  private static final int OFFSET_SHIFT

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  INVALID_GCI

  private static final int INVALID_GCI

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  INVALID_BCI

  private static final int INVALID_BCI

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  INVALID_IEI

  private static final int INVALID_IEI

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  SIZEOF_ENTRY

  private static final int SIZEOF_ENTRY

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  BIG_CALL_MASK

  private static final int BIG_CALL_MASK

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  BIG_CALL_SHIFT

  private static final int BIG_CALL_SHIFT

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  BIG_CALL_IDX_ADJ

  private static final int BIG_CALL_IDX_ADJ

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  BIG_BCI_MASK

  private static final int BIG_BCI_MASK

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  BIG_BCI_SHIFT

  private static final int BIG_BCI_SHIFT

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  BIG_BCI_IDX_ADJ

  private static final int BIG_BCI_IDX_ADJ

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  BIG_IEI_MASK

  private static final int BIG_IEI_MASK

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  BIG_IEI_SHIFT

  private static final int BIG_IEI_SHIFT

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  BIG_IEI_IDX_ADJ

  private static final int BIG_IEI_IDX_ADJ

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  BIG_GCI_MASK

  private static final int BIG_GCI_MASK

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  BIG_GCI_SHIFT

  private static final int BIG_GCI_SHIFT

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  BIG_GCI_IDX_ADJ

  private static final int BIG_GCI_IDX_ADJ

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  BIG_OFFSET_MASK

  private static final int BIG_OFFSET_MASK

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  BIG_OFFSET_SHIFT

  private static final int BIG_OFFSET_SHIFT

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  BIG_OFFSET_IDX_ADJ

  private static final int BIG_OFFSET_IDX_ADJ

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  BIG_INVALID_GCI

  private static final int BIG_INVALID_GCI

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  BIG_INVALID_BCI

  private static final int BIG_INVALID_BCI

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  BIG_INVALID_IEI

  private static final int BIG_INVALID_IEI

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  SIZEOF_BIG_ENTRY

  private static final int SIZEOF_BIG_ENTRY

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  HUGE_CALL_MASK

  private static final int HUGE_CALL_MASK

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  HUGE_CALL_SHIFT

  private static final int HUGE_CALL_SHIFT

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  HUGE_CALL_IDX_ADJ

  private static final int HUGE_CALL_IDX_ADJ

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  HUGE_BCI_MASK

  private static final int HUGE_BCI_MASK

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  HUGE_BCI_SHIFT

  private static final int HUGE_BCI_SHIFT

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  HUGE_BCI_IDX_ADJ

  private static final int HUGE_BCI_IDX_ADJ

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  HUGE_IEI_MASK

  private static final int HUGE_IEI_MASK

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  HUGE_IEI_SHIFT

  private static final int HUGE_IEI_SHIFT

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  HUGE_IEI_IDX_ADJ

  private static final int HUGE_IEI_IDX_ADJ

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  HUGE_GCI_MASK

  private static final int HUGE_GCI_MASK

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  HUGE_GCI_SHIFT

  private static final int HUGE_GCI_SHIFT

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  HUGE_GCI_IDX_ADJ

  private static final int HUGE_GCI_IDX_ADJ

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  HUGE_OFFSET_MASK

  private static final int HUGE_OFFSET_MASK

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  HUGE_OFFSET_SHIFT

  private static final int HUGE_OFFSET_SHIFT

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  HUGE_OFFSET_IDX_ADJ

  private static final int HUGE_OFFSET_IDX_ADJ

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  HUGE_INVALID_GCI

  private static final int HUGE_INVALID_GCI

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  HUGE_INVALID_BCI

  private static final int HUGE_INVALID_BCI

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  HUGE_INVALID_IEI

  private static final int HUGE_INVALID_IEI

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  SIZEOF_HUGE_ENTRY

  private static final int SIZEOF_HUGE_ENTRY

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  IS_UNGUARDED_CALL

  private static final int IS_UNGUARDED_CALL

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  IS_GUARDED_CALL

  private static final int IS_GUARDED_CALL

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  ---

  MCInformation

  private final int[] MCInformation

  Hold entries as defined by the constants above.

  ---

  gcMaps

  private final int[] gcMaps

  array of GC maps as defined by OptGCMap

  ---

  inlineEncoding

  public final int[] inlineEncoding

  encoded data as defined by OptEncodedCallSiteTree.

  ---

  totalMCSize

  private static int totalMCSize

  Running totals for the size of machine code and maps

  ---

  totalMapSize

  private static int totalMapSize

  ---

  emptyMachineCodeMap

  private static final OptMachineCodeMap emptyMachineCodeMap

  A machine code map when no information is present

  ---

  TYPE

  private static final TypeReference TYPE

  Constructor Detail

  OptMachineCodeMap

  private OptMachineCodeMap(int[] _MCInformation,
                            int[] _gcMaps,
                            int[] _inlineEncoding)

  Private constructor, object should be created via create

  ---

  OptMachineCodeMap

  private OptMachineCodeMap()

  Private null constructor for no information

  Method Detail

  create

  static OptMachineCodeMap create(IR ir,
                                  int machineCodeSize)

  Create the map, called during compilation

  Parameters:

  ir - the ir object for this method

  machineCodeSize - the number of machine code instructions generated.

  ---

  getBytecodeIndexForMCOffset

  public int getBytecodeIndexForMCOffset(Offset MCOffset)

  Get the bytecode index for a machine instruction offset.

  Parameters:

  MCOffset - the machine code offset of interest

  Returns:

  -1 if unknown.

  ---

  getMethodForMCOffset

  public NormalMethod getMethodForMCOffset(Offset MCOffset)

  Get the RVMMethod for a machine instruction offset. This method is the source method that the instruction came from.

  Parameters:

  MCOffset - the machine code offset of interest

  Returns:

  null if unknown

  ---

  getInlineEncodingForMCOffset

  public int getInlineEncodingForMCOffset(Offset MCOffset)

  Return the inlining encoding index for the machine instruction offset.

  Parameters:

  MCOffset - the machine code offset of interest

  Returns:

  -1 if unknown.

  ---

  findGCMapIndex

  public int findGCMapIndex(Offset MCOffset)

  This method searches for the GC map corresponding to the passed machine code offset. If no map is present, an error has occurred and OptGCMap.ERROR is returned.

  Parameters:

  MCOffset - the machine code offset to look for

  Returns:

  the GC map index or OptGCMap.ERROR

  ---

  getNonInlinedCallSites

  public ArrayList<CallSite> getNonInlinedCallSites()

  Returns:

  an arraylist of CallSite objects representing all non-inlined callsites in the method. Returns null if there are no such callsites.

  ---

  hasInlinedEdge

  public boolean hasInlinedEdge(RVMMethod caller,
                                int bcIndex,
                                RVMMethod callee)

  This method searches the machine code maps and determines if the given call edge is definitely inlined into the method. NOTE: This current implementation may return false even if the edge actually was inlined. This happens when no GC point occurs within the inlined body. This is less than ideal; we need to fix this at some point.

  Parameters:

  caller - caller RVMMethod

  bcIndex - bytecode index of the caller method

  callee - callee RVMMethod

  Returns:

  true if the call edge is definitely inlined in this compiled method.

  ---

  gcMapInformation

  public int gcMapInformation(int index)

  Returns the GC map information for the GC map information entry passed

  Parameters:

  index - GCmap entry

  ---

  registerIsSet

  public boolean registerIsSet(int entry,
                               int registerNumber)

  Determines if the register map information for the entry passed is true

  Parameters:

  entry - map entry

  registerNumber - the register number

  ---

  nextLocation

  public int nextLocation(int currentIndex)

  Returns:

  the next (relative) location or -1 for no more locations

  ---

  findMCEntry

  private int findMCEntry(Offset MCOffset)

  Do a binary search of the machine code maps to find the index in MCInformation where the entry for the argument machine code offset starts. Will return -1 if the entry doesn't exist.

  Parameters:

  MCOffset - the machine code offset of interest

  ---

  nextEntry

  private int nextEntry(int entry)

  ---

  generateMCInformation

  private static OptMachineCodeMap generateMCInformation(GCIRMap irMap,
                                                         boolean DUMP_MAPS)

  This method walks the IR map, and for each entry it creates the machine code mapping information for the entry. It is called during the compilation of the method, not at GC time.

  Parameters:

  irMap - the irmap to translate from

  DUMP_MAPS - dump while we work

  ---

  getMCOffset

  private int getMCOffset(int entry)

  Returns the MCOffset for the entry passed

  Parameters:

  entry - the index of the start of the entry

  Returns:

  the MCOffset for this entry

  ---

  getGCMapIndex

  private int getGCMapIndex(int entry)

  Returns the GC map index for the entry passed

  Parameters:

  entry - the index of the start of the entry

  Returns:

  the GC map entry index for this entry (or -1 if none)

  ---

  getBytecodeIndex

  private int getBytecodeIndex(int entry)

  Returns the Bytecode index for the entry passed

  Parameters:

  entry - the index of the start of the entry

  Returns:

  the bytecode index for this entry (-1 if unknown)

  ---

  getInlineEncodingIndex

  private int getInlineEncodingIndex(int entry)

  Returns the inline encoding index for the entry passed.

  Parameters:

  entry - the index of the start of the entry

  Returns:

  the inline encoding index for this entry (-1 if unknown)

  ---

  getCallInfo

  private int getCallInfo(int entry)

  Returns the call info for the entry passed.

  Parameters:

  entry - the index of the start of the entry

  Returns:

  the call info for this entry

  ---

  isBigEntry

  private boolean isBigEntry(int entry)

  Is the entry a big entry?

  ---

  isHugeEntry

  private boolean isHugeEntry(int entry)

  Is the entry a big entry?

  ---

  dumpMCInformation

  public void dumpMCInformation(boolean DUMP_MAPS)

  ---

  printMCInformationEntry

  private void printMCInformationEntry(int entry,
                                       boolean DUMP_MAPS)

  Prints the MCInformation for this entry

  Parameters:

  entry - the entry to print

  ---

  recordStats

  private void recordStats(RVMMethod method,
                           int mapSize,
                           int machineCodeSize,
                           boolean DUMP_MAP_SIZES)

  Gather cumulative stats about the space consumed by maps.

  Parameters:

  method -

  mapSize -

  machineCodeSize -

  DUMP_MAP_SIZES -

  ---

  size

  int size()

  Total bytes of machine code maps

  ---

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