com.ibm.dtfj.java

Interface JavaLocation


  1. public interface JavaLocation
Represents a point of execution within a Java method.

Method Summary

Modifier and Type Method and Description
  1. boolean
equals(java.lang.Object obj)
  1. ImagePointer
getAddress()
Fetches the absolute address of the code which this location represents.
  1. int
getCompilationLevel()
Get the compilation level for this location.
  1. java.lang.String
getFilename()
Get the source file name.
  1. int
getLineNumber()
Get the line number.
  1. JavaMethod
getMethod()
Get the method which contains the point of execution.
  1. int
hashCode()
  1. java.lang.String
toString()

Method Detail

getAddress

  1. ImagePointer getAddress()
  2. throws CorruptDataException
Fetches the absolute address of the code which this location represents. This pointer will be contained within one of the segments returned by getBytecodeSections() or getCompiledSections() of the method returned by getMethod().

null may be returned, particularly for methods with no bytecode or compiled sections (e.g. some native methods)

Although an offset into the method may be calculated using this pointer, caution should be exercised in attempting to map this offset to an offset within the original class file. Various transformations may have been applied to the bytecodes by the VM or other agents which may make the offset difficult to interpret.

For native methods, the address may be meaningless.

Returns:
the address in memory of the managed code
Throws:

getLineNumber

  1. int getLineNumber()
  2. throws DataUnavailable
  3. CorruptDataException
Get the line number.
Returns:
the line number, if available, or throws DataUnavailable if it is not available Line numbers are counted from 1
Throws:
DataUnavailable - if the line number data is not available for this location

getFilename

  1. java.lang.String getFilename()
  2. throws DataUnavailable
  3. CorruptDataException
Get the source file name.
Returns:
the name of the source file, if available, or throws DataUnavailable if it is not available
Throws:
DataUnavailable - if the source file name is unavailable in the core

getCompilationLevel

  1. int getCompilationLevel()
  2. throws CorruptDataException
Get the compilation level for this location. This is an implementation defined number indicating the level at which the current location was compiled. 0 indicates interpreted. Any positive number indicates some level of JIT compilation. Typically, higher numbers indicate more aggressive compilation strategies

For native methods, a non-zero compilation level indicates that some level of JIT compilation has been applied to the native call (e.g. a custom native call stub). To determine if the method is native, use getMethod().getModifiers().

Returns:
the compilation level
Throws:

getMethod

  1. JavaMethod getMethod()
  2. throws CorruptDataException
Get the method which contains the point of execution.
Returns:
the method which contains the point of execution
Throws:

toString

  1. java.lang.String toString()
Overrides:
toString in class java.lang.Object
Returns:
A string representing the location as it would be seen in a Java stack trace

equals

  1. boolean equals(java.lang.Object obj)
Overrides:
equals in class java.lang.Object
Parameters:
obj -
Returns:
True if the given object refers to the same Java Location in the image

hashCode

  1. int hashCode()
Overrides:
hashCode in class java.lang.Object