OpenJDK 27 · sun.jvm.hotspot.runtime.VFrame · APIdia, the JavaDoc alternative

Modifier and Type	Field and Description
protected Frame	fr
protected RegisterMap	regMap
protected JavaThread	thread

Access	Constructor and Description
protected	VFrame(Frame f, RegisterMap regMap, JavaThread thread)

Method Summary

Modifier and Type	Method and Description
public Frame	getFrame() Accessors
public RegisterMap	getRegisterMap()
public JavaThread	getThread()
public boolean	isCompiledFrame()
public boolean	isDeoptimized()
public boolean	isEntryFrame() Type testing operations
public boolean	isInterpretedFrame()
public boolean	isJavaFrame()
public boolean	isTop() Answers if the this is the top vframe in the frame, i.e., if the sender vframe is in the caller frame
public JavaVFrame	javaSender() Returns the next javaVFrame on the stack (skipping all other kinds of frames).
public boolean	mayBeImpreciseDbg() An indication of whether this VFrame is "precise" or a best guess.
public static VFrame	newVFrame(Frame f, RegisterMap regMap, JavaThread thread, boolean unsafe, boolean mayBeImprecise) Factory method for creating vframes.
public static VFrame	newVFrame(Frame f, RegisterMap regMap, JavaThread thread) Factory method for creating vframes.
public void	print() Printing operations
public void	printOn(PrintStream tty)
public void	printValue()
public void	printValueOn(PrintStream tty)
public VFrame	sender() Returns the sender vframe
public VFrame	sender(boolean mayBeImprecise) Returns the sender vframe; takes argument for debugging situation
public VFrame	top() Returns top vframe within same frame (see isTop())

Inherited from java.lang.Object:: clone equals finalize getClass hashCode notify notifyAll toString wait wait wait

fr	back to summary
protected Frame fr

regMap	back to summary
protected RegisterMap regMap

thread	back to summary
protected JavaThread thread

VFrame	back to summary
protected VFrame(Frame f, RegisterMap regMap, JavaThread thread)

Method Detail

getFrame	back to summary
public Frame getFrame() Accessors

getRegisterMap	back to summary
public RegisterMap getRegisterMap()

getThread	back to summary
public JavaThread getThread()

isCompiledFrame	back to summary
public boolean isCompiledFrame()

isDeoptimized	back to summary
public boolean isDeoptimized()

isEntryFrame	back to summary
public boolean isEntryFrame() Type testing operations

isInterpretedFrame	back to summary
public boolean isInterpretedFrame()

isJavaFrame	back to summary
public boolean isJavaFrame()

isTop	back to summary
public boolean isTop() Answers if the this is the top vframe in the frame, i.e., if the sender vframe is in the caller frame

javaSender	back to summary
public JavaVFrame javaSender() Returns the next javaVFrame on the stack (skipping all other kinds of frames). In the debugging situation, allows the "imprecise" flag to propagate up the stack. We must not assert that a ScopeDesc exists for the topmost compiled frame on the stack.

mayBeImpreciseDbg	back to summary
public boolean mayBeImpreciseDbg() An indication of whether this VFrame is "precise" or a best guess. This is used in the debugging system to handle the top frame on the stack, which, since the system will in general not be at a safepoint, has to make some guesses about exactly where in the execution it is. Any debugger should indicate to the user that the information for this frame may not be 100% correct. FIXME: may need to move this up into VFrame instead of keeping it in CompiledVFrame.

mayBeImpreciseDbg

back to summary

public boolean mayBeImpreciseDbg()

An indication of whether this VFrame is "precise" or a best guess. This is used in the debugging system to handle the top frame on the stack, which, since the system will in general not be at a safepoint, has to make some guesses about exactly where in the execution it is. Any debugger should indicate to the user that the information for this frame may not be 100% correct. FIXME: may need to move this up into VFrame instead of keeping it in CompiledVFrame.

newVFrame	back to summary
public static VFrame newVFrame(Frame f, RegisterMap regMap, JavaThread thread, boolean unsafe, boolean mayBeImprecise) Factory method for creating vframes. The "unsafe" flag turns off an assertion which the runtime system uses to ensure integrity, but which must not be applied in the debugging situation. The "mayBeImprecise" flag should be set to true for the case of the top frame in the debugging system (obtained via JavaThread.getCurrentFrameGuess()).

newVFrame

back to summary

public static VFrame newVFrame(Frame f, RegisterMap regMap, JavaThread thread, boolean unsafe, boolean mayBeImprecise)

Factory method for creating vframes. The "unsafe" flag turns off an assertion which the runtime system uses to ensure integrity, but which must not be applied in the debugging situation. The "mayBeImprecise" flag should be set to true for the case of the top frame in the debugging system (obtained via JavaThread.getCurrentFrameGuess()).

newVFrame	back to summary
public static VFrame newVFrame(Frame f, RegisterMap regMap, JavaThread thread) Factory method for creating vframes. This is equivalent to calling the above version with the "unsafe" and "imprecise" flags set to false.

print	back to summary
public void print() Printing operations

printOn	back to summary
public void printOn(PrintStream tty)

printValue	back to summary
public void printValue()

printValueOn	back to summary
public void printValueOn(PrintStream tty)

sender	back to summary
public VFrame sender() Returns the sender vframe

sender	back to summary
public VFrame sender(boolean mayBeImprecise) Returns the sender vframe; takes argument for debugging situation

top	back to summary
public VFrame top() Returns top vframe within same frame (see isTop())

public Class VFrame

Field Summary

Constructor Summary

Method Summary

Field Detail

Constructor Detail

Method Detail