Module openj9.dtfj

Interface JavaLocation

    • Method Detail

      • getAddress

        ImagePointer getAddress()
                         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:
        CorruptDataException
      • getCompilationLevel

        int getCompilationLevel()
                         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:
        CorruptDataException
      • toString

        String toString()
        Description copied from class: java.lang.Object
        Answers a string containing a concise, human-readable description of the receiver.
        Overrides:
        toString in class Object
        Returns:
        A string representing the location as it would be seen in a Java stack trace
      • equals

        boolean equals​(Object obj)
        Description copied from class: java.lang.Object
        Compares the argument to the receiver, and answers true if they represent the same object using a class specific comparison. The implementation in Object answers true only if the argument is the exact same object as the receiver (==).
        Overrides:
        equals in class Object
        Parameters:
        obj -
        Returns:
        True if the given object refers to the same Java Location in the image
        See Also:
        Object.hashCode()
      • hashCode

        int hashCode()
        Description copied from class: java.lang.Object
        Answers an integer hash code for the receiver. Any two objects which answer true when passed to .equals must answer the same value for this method.
        Overrides:
        hashCode in class Object
        Returns:
        the receiver's hash.
        See Also:
        Object.equals(java.lang.Object)