com.oracle.graal.hotspot.stubs

Class ExceptionHandlerStub

java.lang.Object

com.oracle.graal.hotspot.stubs.Stub

com.oracle.graal.hotspot.stubs.SnippetStub

com.oracle.graal.hotspot.stubs.ExceptionHandlerStub

All Implemented Interfaces:

Snippets

public class ExceptionHandlerStub
extends SnippetStub

Stub called by the exception handler entry point in a compiled method. This entry point is used when returning to a method to handle an exception thrown by a callee. It is not used for routing implicit exceptions. Therefore, it does not need to save any registers as HotSpot uses a caller save convention.

The descriptor for a call to this stub is HotSpotBackend.EXCEPTION_HANDLER.

Field Summary

Fields

Modifier and Type	Field and Description
static ForeignCallDescriptor	EXCEPTION_HANDLER_FOR_PC

Fields inherited from class com.oracle.graal.hotspot.stubs.SnippetStub

method, SnippetGraphUnderConstruction

Fields inherited from class com.oracle.graal.hotspot.stubs.Stub

code, compResult, linkage, providers

Constructor Summary

Constructors

Constructor and Description
ExceptionHandlerStub(HotSpotProviders providers, HotSpotForeignCallLinkage linkage)

Method Summary

Modifier and Type	Method and Description
private static boolean	assertionsEnabled() Determines if either Java assertions are enabled for ExceptionHandlerStub or if this is a HotSpot build where the ASSERT mechanism is enabled.
(package private) static void	checkExceptionNotNull(boolean enabled, Object exception)
(package private) static void	checkNoExceptionInThread(Word thread, boolean enabled)
private static void	exceptionHandler(Object exception, Word exceptionPc, Register threadRegister)
static Word	exceptionHandlerForPc(ForeignCallDescriptor exceptionHandlerForPc, Word thread)
protected Object	getConstantParameterValue(int index, String name)
private static boolean	logging()
boolean	preservesRegisters() This stub is called when returning to a method to handle an exception thrown by a callee.

Methods inherited from class com.oracle.graal.hotspot.stubs.SnippetStub

checkConstArg, debugScopeContext, getGraph, getInstalledCodeOwner, makeConstArgs, toString

Methods inherited from class com.oracle.graal.hotspot.stubs.Stub

getCode, getCompilationResult, getDestroyedRegisters, getLinkage, getRegisterConfig, getStubs, initDestroyedRegisters

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, wait, wait, wait

Field Detail

EXCEPTION_HANDLER_FOR_PC

public static final ForeignCallDescriptor EXCEPTION_HANDLER_FOR_PC

Constructor Detail

ExceptionHandlerStub

public ExceptionHandlerStub(HotSpotProviders providers,
                            HotSpotForeignCallLinkage linkage)

Method Detail

preservesRegisters

public boolean preservesRegisters()

This stub is called when returning to a method to handle an exception thrown by a callee. It is not used for routing implicit exceptions. Therefore, it does not need to save any registers as HotSpot uses a caller save convention.

Overrides:

preservesRegisters in class Stub

getConstantParameterValue

protected Object getConstantParameterValue(int index,
                                           String name)

Overrides:

getConstantParameterValue in class SnippetStub

exceptionHandler

private static void exceptionHandler(Object exception,
                                     Word exceptionPc,
                                     Register threadRegister)

checkNoExceptionInThread

static void checkNoExceptionInThread(Word thread,
                                     boolean enabled)

checkExceptionNotNull

static void checkExceptionNotNull(boolean enabled,
                                  Object exception)

logging

private static boolean logging()

assertionsEnabled

private static boolean assertionsEnabled()

Determines if either Java assertions are enabled for ExceptionHandlerStub or if this is a HotSpot build where the ASSERT mechanism is enabled.

This first check relies on the per-class assertion status which is why this method must be in this class.

exceptionHandlerForPc

public static Word exceptionHandlerForPc(ForeignCallDescriptor exceptionHandlerForPc,
                                         Word thread)