public class AMD64CurrentFrameGuess
extends java.lang.Object
Should be able to be used on all amd64 platforms we support (Linux/amd64) to implement JavaThread's "currentFrameGuess()" functionality. Input is an AMD64ThreadContext; output is SP, FP, and PC for an AMD64Frame. Instantiation of the AMD64Frame is left to the caller, since we may need to subclass AMD64Frame 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.
Constructor and Description |
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AMD64CurrentFrameGuess(AMD64ThreadContext context,
JavaThread thread) |
Modifier and Type | Method and Description |
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Address |
getFP() |
Address |
getPC()
May be null if getting values from thread-local storage; take
care to call the correct AMD64Frame constructor to recover this if
necessary
|
Address |
getSP() |
boolean |
run(long regionInBytesToSearch)
Returns false if not able to find a frame within a reasonable range.
|
public AMD64CurrentFrameGuess(AMD64ThreadContext context, JavaThread thread)
public boolean run(long regionInBytesToSearch)
public Address getSP()
public Address getFP()
public Address getPC()
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