org.jikesrvm.compilers.opt.runtimesupport

Class OptExceptionTable

java.lang.Object

org.jikesrvm.compilers.common.ExceptionTable

org.jikesrvm.compilers.opt.runtimesupport.OptExceptionTable

final class OptExceptionTable
extends ExceptionTable

Encoding of try ranges in the final machinecode and the corresponding exception type and catch block start.

Field Summary

Fields

Modifier and Type	Field and Description
private static int	UNREACHABLE_CATCH_BLOCK Marker for catch blocks that have no associated code.

Fields inherited from class org.jikesrvm.compilers.common.ExceptionTable

CATCH_START, EX_TYPE, TRY_END, TRY_START

Constructor Summary

Constructors

Constructor and Description
OptExceptionTable()

Method Summary

Modifier and Type	Method and Description
(package private) static boolean	belongsToUnreachableCatchBlock(int catchOffset)
private static int	countExceptionTableSize(IR ir)
(package private) static int[]	encode(IR ir) Encode an exception table

Methods inherited from class org.jikesrvm.compilers.common.ExceptionTable

findCatchBlockForInstruction, printExceptionTable, printExceptionTableUninterruptible

Methods inherited from class java.lang.Object

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

Field Detail

UNREACHABLE_CATCH_BLOCK

private static final int UNREACHABLE_CATCH_BLOCK

Marker for catch blocks that have no associated code. This happens when the optimizing compiler deems the catch block to be unreachable and removes it from the IR.

The only constraint on the concrete value for this marker is that it must be negative to ensure that the non-existent catch block is never found when exceptions are delivered.

See Also:

Constant Field Values

Constructor Detail

OptExceptionTable

OptExceptionTable()

Method Detail

encode

static int[] encode(IR ir)

Encode an exception table

Parameters:

ir - the IR to encode the exception table for

Returns:

the encoded exception table

countExceptionTableSize

private static int countExceptionTableSize(IR ir)

Parameters:

ir - the IR with the exception tables

Returns:

an upper bound on the size of the exception table for an IR.

belongsToUnreachableCatchBlock

static boolean belongsToUnreachableCatchBlock(int catchOffset)