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Java VM Debugging Commands
The following commands have been added to enhance Java debugging support:
brbacktrace Prints backtrace of mixed Java and native frames. Standard
backtrace command of GDB has been enhanced to work with mixed
Java and native stack frames.
info frame Prints Java frame specific information for a Java frame. Standard
frame command of GDB has been enhanced to interpret a Java
stack frame.
info threads Prints state information for Java threads.
thread Prints detailed state information for the current Java thread.
Java subcommands
The following Java subcommands have been added:
java args <frame-number>
Prints the current or specified Java frame
arguments information
java bytecodes <methodOop>
Disassembles the given Java method bytecode
java heap-histogram Displays the Java heap object histogram
java instances <klassOop>
Locates the instances of the given klassOop in
the Java heap.
java jvm-state Prints current status of JVM internal states
java locals Prints the current or specified Java frame locals
information
java mutex-info Prints details of static mutexes
java object <object-ptr>
Prints the given Java object field information
java oop <Java_heap_address>
Locates Java object oop of the given Java heap
address
java references <oop>
Locates references to the given Java object in the
Java heap
java unwind-info <pc>
Prints unwind information of the code where the
PC is located
java unwind-table Prints the dynamically generated Java Unwind
Table
Type help java followed by the subcommand name for full documentation. Command
name abbreviations are allowed if they are unambiguous.
14.25 Language support 219