public class: X86CurrentFrameGuess
Should be able to be used on all x86 platforms we support
(Win32, Solaris/x86, and soon Linux) to implement JavaThread's
"currentFrameGuess()" functionality. Input is an X86ThreadContext;
output is SP, FP, and PC for an X86Frame. Instantiation of the
X86Frame is left to the caller, since we may need to subclass
X86Frame to support signal handler frames on Unix platforms.
Algorithm is to walk up the stack within a given range (say,
512K at most) looking for a plausible PC and SP for a Java frame,
also considering those coming in from the context. If we find a PC
that belongs to the VM (i.e., in generated code like the
interpreter or CodeCache) then we try to find an associated EBP.
We repeat this until we either find a complete frame or run out of
stack to look at.
|Method from sun.jvm.hotspot.runtime.x86.X86CurrentFrameGuess Summary:|
getFP, getPC, getSP, run|
|Methods from java.lang.Object:|
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait|
|Method from sun.jvm.hotspot.runtime.x86.X86CurrentFrameGuess Detail:|
public Address getFP()
public Address getPC()
May be null if getting values from thread-local storage; take
care to call the correct X86Frame constructor to recover this if
public Address getSP()
public boolean run(long regionInBytesToSearch)
Returns false if not able to find a frame within a reasonable range.