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org.jikesrvm.jni.ia32
Class JNIGCMapIterator

java.lang.Object
  extended by org.jikesrvm.mm.mminterface.GCMapIterator
      extended by org.jikesrvm.jni.ia32.JNIGCMapIterator
All Implemented Interfaces:
Constants, HeapLayoutConstants, ArchConstants, BaselineConstants, RegisterConstants, StackframeLayoutConstants, TrapConstants, ThinLockConstants, TIBLayoutConstants, SizeConstants
Direct Known Subclasses:
ArchitectureSpecific.JNIGCMapIterator
public abstract class JNIGCMapIterator
extends GCMapIterator
implements BaselineConstants

Iterator for stack frames inserted at the transition from Java to JNI Native C. It will report JREFs associated with the executing C frames which are in the "JREFs stack" attached to the executing Threads JNIEnvironment. It will update register location addresses for the non-volatile registers to point to the registers saved in the transition frame.

See Also:
JNICompiler

Nested Class Summary
 
Nested classes/interfaces inherited from interface org.jikesrvm.ia32.RegisterConstants
RegisterConstants.FloatingPointMachineRegister, RegisterConstants.FPR, RegisterConstants.GPR, RegisterConstants.MachineRegister, RegisterConstants.MM, RegisterConstants.XMM
 
Field Summary
(package private)  int jniFramePtr
           
(package private)  int jniNextRef
           
(package private)  AddressArray jniRefs
           
 
Fields inherited from class org.jikesrvm.mm.mminterface.GCMapIterator
framePtr, registerLocations, thread
 
Fields inherited from interface org.jikesrvm.ia32.BaselineConstants
BRIDGE_FRAME_EXTRA_SIZE, EBP_SAVE_OFFSET, EBX_SAVE_OFFSET, EDI_SAVE_OFFSET, FPU_SAVE_OFFSET, LG_WORDSIZE, S0, S1, SAVED_GPRS, SAVED_GPRS_FOR_SAVE_LS_REGISTERS, SP, STACKFRAME_FIRST_PARAMETER_OFFSET, STACKFRAME_REG_SAVE_OFFSET, T0, T0_int, T0_SAVE_OFFSET, T1, T1_int, T1_SAVE_OFFSET, TR, WORDSIZE, XMM_SAVE_OFFSET
 
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.ia32.ArchConstants
SSE2_BASE, SSE2_FULL
 
Fields inherited from interface org.jikesrvm.ia32.StackframeLayoutConstants
BYTES_IN_STACKSLOT, FPU_STATE_SIZE, INVISIBLE_METHOD_ID, LOG_BYTES_IN_STACKSLOT, STACK_SIZE_BOOT, STACK_SIZE_COLLECTOR, STACK_SIZE_DLOPEN, STACK_SIZE_GCDISABLED, STACK_SIZE_GROW, STACK_SIZE_GUARD, STACK_SIZE_JNINATIVE_GROW, STACK_SIZE_MAX, STACK_SIZE_NORMAL, STACK_SIZE_SYSCALL, STACKFRAME_ALIGNMENT, STACKFRAME_BODY_OFFSET, STACKFRAME_FRAME_POINTER_OFFSET, STACKFRAME_HEADER_SIZE, STACKFRAME_METHOD_ID_OFFSET, STACKFRAME_RETURN_ADDRESS_OFFSET, STACKFRAME_SENTINEL_FP, XMM_STATE_SIZE
 
Fields inherited from interface org.jikesrvm.ia32.RegisterConstants
ALL_FPRS, ALL_GPRS, EAX, EBP, EBX, ECX, EDI, EDX, ESI, ESP, FP0, FP1, FP2, FP3, FP4, FP5, FP6, FP7, INSTRUCTION_WIDTH, LG_INSTRUCTION_WIDTH, MM0, MM1, MM10, MM11, MM12, MM13, MM14, MM15, MM2, MM3, MM4, MM5, MM6, MM7, MM8, MM9, NATIVE_NONVOLATILE_FPRS, NATIVE_NONVOLATILE_GPRS, NATIVE_PARAMETER_FPRS, NATIVE_PARAMETER_GPRS, NATIVE_VOLATILE_FPRS, NATIVE_VOLATILE_GPRS, NONVOLATILE_FPRS, NONVOLATILE_GPRS, NUM_FPRS, NUM_GPRS, NUM_NONVOLATILE_FPRS, NUM_NONVOLATILE_GPRS, NUM_PARAMETER_FPRS, NUM_PARAMETER_GPRS, NUM_RETURN_FPRS, NUM_RETURN_GPRS, NUM_VOLATILE_FPRS, NUM_VOLATILE_GPRS, PARAMETER_FPRS, PARAMETER_GPRS, R0, R1, R10, R11, R12, R13, R14, R15, R2, R3, R4, R5, R6, R7, R8, R9, RETURN_FPRS, RETURN_GPRS, STACK_POINTER, THREAD_REGISTER, VOLATILE_FPRS, VOLATILE_GPRS, XMM0, XMM1, XMM10, XMM11, XMM12, XMM13, XMM14, XMM15, XMM2, XMM3, XMM4, XMM5, XMM6, XMM7, XMM8, XMM9
 
Fields inherited from interface org.jikesrvm.ia32.TrapConstants
RVM_TRAP_BASE
 
Constructor Summary
JNIGCMapIterator(WordArray registerLocations)
           
 
Method Summary
 void cleanupPointers()
          Iteration is complete, release any internal data structures including locks acquired during setupIterator for jsr maps.
 Address getNextReferenceAddress()
          Get address of next object reference held by current stackframe.
 Address getNextReturnAddressAddress()
          Get address of next JSR return address held by current stackframe.
 int getType()
          Get the type of this iterator (BASELINE, OPT, etc.).
 void newStackWalk(RVMThread thread)
          Prepare to scan a thread's stack and saved registers for object references.
 void reset()
          Prepare to re-iterate on same stackframe, and to switch between "reference" iteration and "JSR return address" iteration.
 void setupIterator(CompiledMethod compiledMethod, Offset instructionOffset, Address framePtr)
          Prepare to iterate over object references and JSR return addresses held by a stackframe.
 
Methods inherited from class java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait
 

Field Detail

jniRefs

AddressArray jniRefs

jniNextRef

int jniNextRef

jniFramePtr

int jniFramePtr
Constructor Detail

JNIGCMapIterator

public JNIGCMapIterator(WordArray registerLocations)
Method Detail

newStackWalk

public void newStackWalk(RVMThread thread)
Description copied from class: GCMapIterator
Prepare to scan a thread's stack and saved registers for object references.

Overrides:
newStackWalk in class GCMapIterator
Parameters:
thread - Thread whose stack is being scanned

setupIterator

public void setupIterator(CompiledMethod compiledMethod,
                          Offset instructionOffset,
                          Address framePtr)
Description copied from class: GCMapIterator
Prepare to iterate over object references and JSR return addresses held by a stackframe.

Specified by:
setupIterator in class GCMapIterator
Parameters:
compiledMethod - method running in the stackframe
instructionOffset - offset of current instruction within that method's code
framePtr - address of stackframe to be visited

getNextReferenceAddress

public Address getNextReferenceAddress()
Description copied from class: GCMapIterator
Get address of next object reference held by current stackframe. Returns zero when there are no more references to report.

Side effect: registerLocations[] updated at end of iteration. TODO: registerLocations[] update should be done via separately called method instead of as side effect.

Specified by:
getNextReferenceAddress in class GCMapIterator
Returns:
address of word containing an object reference zero if no more references to report

getNextReturnAddressAddress

public Address getNextReturnAddressAddress()
Description copied from class: GCMapIterator
Get address of next JSR return address held by current stackframe.

Specified by:
getNextReturnAddressAddress in class GCMapIterator
Returns:
address of word containing a JSR return address zero if no more return addresses to report

reset

public void reset()
Description copied from class: GCMapIterator
Prepare to re-iterate on same stackframe, and to switch between "reference" iteration and "JSR return address" iteration.

Specified by:
reset in class GCMapIterator

cleanupPointers

public void cleanupPointers()
Description copied from class: GCMapIterator
Iteration is complete, release any internal data structures including locks acquired during setupIterator for jsr maps.

Specified by:
cleanupPointers in class GCMapIterator

getType

public int getType()
Description copied from class: GCMapIterator
Get the type of this iterator (BASELINE, OPT, etc.). Called from GCMapIteratorGroup to select which iterator to use for a stackframe. The possible types are specified in CompiledMethod.

Specified by:
getType in class GCMapIterator
Returns:
type code for this iterator
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