Package com.tonic.parser.attribute.table

Class LvtSupport

java.lang.Object

com.tonic.parser.attribute.table.LvtSupport

public final class LvtSupport
extends Object

Shared primitives for emitting LocalVariableTable entries, used by both LVT builders.

Method Summary

Modifier and Type	Method	Description
static void	dropSameSlotOverlaps(List<LocalVariableTableEntry> entries)	Drops any same-slot entry whose scope overlaps an already-kept one (keeps the earlier entry).
static LocalVariableTableEntry	entry(ConstPool constPool, int slot, String name, String descriptor, int startPc, int length)	Builds an entry, resolving the name + descriptor to UTF-8 constant-pool indices.
static boolean	valid(int slot, int maxLocals, int startPc, int length, int codeLength)	True when an entry is well-formed: slot in range and scope wholly within the code.

Methods inherited from class java.lang.Object

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

Method Detail

entry

public static LocalVariableTableEntry entry(ConstPool constPool,
                                            int slot,
                                            String name,
                                            String descriptor,
                                            int startPc,
                                            int length)

Builds an entry, resolving the name + descriptor to UTF-8 constant-pool indices.

Parameters:

constPool - the pool the UTF-8 entries are added to

slot - the local variable slot

name - the variable name

descriptor - the variable's field descriptor

startPc - the first code offset the entry covers

length - the number of bytes the entry covers

Returns:

the built entry

valid

public static boolean valid(int slot,
                            int maxLocals,
                            int startPc,
                            int length,
                            int codeLength)

True when an entry is well-formed: slot in range and scope wholly within the code.

Parameters:

slot - the local variable slot

maxLocals - the method's local slot count

startPc - the first code offset the entry covers

length - the number of bytes the entry covers

codeLength - the method's code length

Returns:

true when the slot and the scope are both in range

dropSameSlotOverlaps

public static void dropSameSlotOverlaps(List<LocalVariableTableEntry> entries)

Drops any same-slot entry whose scope overlaps an already-kept one (keeps the earlier entry).

Parameters:

entries - the entry list, rewritten in place