jdk.internal.jvmci.code

Class BytecodePosition

java.lang.Object

jdk.internal.jvmci.code.BytecodePosition

Direct Known Subclasses:

BytecodeFrame

public class BytecodePosition
extends Object

Represents a code position, that is, a chain of inlined methods with bytecode locations, that is communicated from the compiler to the runtime system. A code position can be used by the runtime system to reconstruct a source-level stack trace for exceptions and to create frames for deoptimization.

Field Summary

Fields

Modifier and Type	Field and Description
private int	bci
private BytecodePosition	caller
private ResolvedJavaMethod	method

Constructor Summary

Constructors

Constructor and Description
BytecodePosition(BytecodePosition caller, ResolvedJavaMethod method, int bci) Constructs a new object representing a given parent/caller, a given method, and a given BCI.

Method Summary

Modifier and Type	Method and Description
BytecodePosition	addCaller(BytecodePosition link) Adds a caller to the current position returning the new position.
boolean	equals(Object obj) Deep equality test.
int	getBCI()
BytecodePosition	getCaller() The position where this position has been called, null if none.
ResolvedJavaMethod	getMethod()
int	hashCode()
String	toString() Converts this code position to a string representation.

Methods inherited from class java.lang.Object

clone, finalize, getClass, notify, notifyAll, wait, wait, wait

Field Detail

caller

private final BytecodePosition caller

method

private final ResolvedJavaMethod method

bci

private final int bci

Constructor Detail

BytecodePosition

public BytecodePosition(BytecodePosition caller,
                        ResolvedJavaMethod method,
                        int bci)

Constructs a new object representing a given parent/caller, a given method, and a given BCI.

Parameters:

caller - the parent position

method - the method

bci - a BCI within the method

Method Detail

toString

public String toString()

Converts this code position to a string representation.

Overrides:

toString in class Object

Returns:

a string representation of this code position

equals

public boolean equals(Object obj)

Deep equality test.

Overrides:

equals in class Object

hashCode

public int hashCode()

Overrides:

hashCode in class Object

getBCI

public int getBCI()

Returns:

The location within the method, as a bytecode index. The constant -1 may be used to indicate the location is unknown, for example within code synthesized by the compiler.

getMethod

public ResolvedJavaMethod getMethod()

Returns:

The runtime interface method for this position.

getCaller

public BytecodePosition getCaller()

The position where this position has been called, null if none.

addCaller

public BytecodePosition addCaller(BytecodePosition link)

Adds a caller to the current position returning the new position.