org.jikesrvm.jni
Class JNICompiledMethod

java.lang.Object
  org.jikesrvm.compilers.common.CompiledMethod
      org.jikesrvm.jni.JNICompiledMethod

All Implemented Interfaces:

SizeConstants

public final class JNICompiledMethod
extends CompiledMethod

Information associated with artifical stackframe inserted at the transition from Jave to JNI Native C. Exception delivery should never see Native C frames, or the Java to C transition frame. Native C code is redispatched during exception handling to either process/handle and clear the exception or to return to Java leaving the exception pending. If it returns to the transition frame with a pending exception. JNI causes an athrow to happen as if it was called at the call site of the call to the native method.

deliverer

private static final ExceptionDeliverer deliverer

Architecture specific deliverer of exceptions

JNICompiledMethod

public JNICompiledMethod(int id,
                         RVMMethod m)

getCompilerType

public int getCompilerType()

Description copied from class: CompiledMethod

Identify the compiler that produced this compiled method.

Specified by:

getCompilerType in class CompiledMethod

Returns:

one of TRAP, BASELINE, OPT, or JNI. Note: use this instead of "instanceof" when gc is disabled (ie. during gc)

getCompilerName

public String getCompilerName()

Specified by:

getCompilerName in class CompiledMethod

Returns:

Name of the compiler that produced this compiled method.

getExceptionDeliverer

public ExceptionDeliverer getExceptionDeliverer()

Description copied from class: CompiledMethod

Get handler to deal with stack unwinding and exception delivery for this compiled method's stackframes.

Specified by:

getExceptionDeliverer in class CompiledMethod

getDynamicLink

public void getDynamicLink(DynamicLink dynamicLink,
                           Offset instructionOffset)

Description copied from class: CompiledMethod

Fetch symbolic reference to a method that's called by one of this method's instructions.

Specified by:

getDynamicLink in class CompiledMethod

Parameters:

dynamicLink - place to put return information

instructionOffset - offset of machine instruction from start of this method, in bytes Notes:

• The "instructionOffset" must point to the instruction i following the call instruction whose target method is sought. This allows us to properly handle the case where the only address we have to work with is a return address (ie. from a stackframe) on a machine architecture with variable length instructions. In such situations we'd have no idea how far to back up the instruction pointer to point to the "call site".
• The implementation must not cause any allocations, because it executes with gc disabled when called by GCMapIterator.

isWithinUninterruptibleCode

public boolean isWithinUninterruptibleCode(Offset instructionOffset)

Description copied from class: CompiledMethod

Return whether or not the given address (which is purported to be inside of the compiled method's code array) corresponds to an uninterruptible context.

Specified by:

isWithinUninterruptibleCode in class CompiledMethod

Parameters:

instructionOffset - of addr from start of instructions in bytes

Returns:

true if the IP is within an Uninterruptible method, false otherwise.

findCatchBlockForInstruction

public int findCatchBlockForInstruction(Offset instructionOffset,
                                        RVMType exceptionType)

Description copied from class: CompiledMethod

Find "catch" block for a machine instruction of this method that might be guarded against specified class of exceptions by a "try" block .

Specified by:

findCatchBlockForInstruction in class CompiledMethod

Parameters:

instructionOffset - offset of machine instruction from start of this method, in bytes

exceptionType - type of exception being thrown - something like "NullPointerException"

Returns:

offset of machine instruction for catch block (-1 --> no catch block) Notes:

• The "instructionOffset" must point to the instruction following the actual instruction whose catch block is sought. This allows us to properly handle the case where the only address we have to work with is a return address (ie. from a stackframe) or an exception address (ie. from a null pointer dereference, array bounds check, or divide by zero) on a machine architecture with variable length instructions. In such situations we'd have no idea how far to back up the instruction pointer to point to the "call site" or "exception site".
• This method must not cause any allocations, because it executes with gc disabled when called by RuntimeEntrypoints.deliverException().

printStackTrace

public void printStackTrace(Offset instructionOffset,
                            PrintLN out)

Description copied from class: CompiledMethod

Print this compiled method's portion of a stack trace

Specified by:

printStackTrace in class CompiledMethod

Parameters:

instructionOffset - offset of machine instruction from start of method

out - the PrintLN to print the stack trace to.

set

public void set(StackBrowser browser,
                Offset instr)

Description copied from class: CompiledMethod

Set the stack browser to the innermost logical stack frame of this method

Specified by:

set in class CompiledMethod