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257 lines
6.8 KiB
257 lines
6.8 KiB
/* VariableSet Copyright (C) 1998-2002 Jochen Hoenicke.
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU Lesser General Public License as published by
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* the Free Software Foundation; either version 2, or (at your option)
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* any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public License
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* along with this program; see the file COPYING.LESSER. If not, write to
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* the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA.
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*
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* $Id$
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*/
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package net.sf.jode.flow;
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import net.sf.jode.decompiler.LocalInfo;
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import net.sf.jode.util.ArrayEnum;
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///#def COLLECTIONS java.util
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import java.util.Collection;
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import java.util.AbstractSet;
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import java.util.Iterator;
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///#enddef
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/**
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* This class represents a set of Variables, which are mainly used in
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* the in/out sets of StructuredBlock. The type of the Variables is
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* LocalInfo. <p>
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*
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* It defines some Helper-Function, like intersecting, merging, union
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* and difference. <p>
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*
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* Note that a variable set can contain LocalInfos that use the same
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* slot, but are different.
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*/
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public final class VariableSet extends AbstractSet implements Cloneable {
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LocalInfo[] locals;
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int count;
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/**
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* Creates a new empty variable set
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*/
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public VariableSet() {
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locals = null;
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count = 0;
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}
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/**
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* Creates a new pre initialized variable set
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*/
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public VariableSet(LocalInfo[] locals) {
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count = locals.length;
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this.locals = locals;
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}
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public final void grow(int size) {
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if (locals != null) {
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size += count;
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if (size > locals.length) {
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int nextSize = locals.length * 2;
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// GlobalOptions.err.println("wanted: "+size+" next: "+nextSize);
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LocalInfo[] newLocals
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= new LocalInfo[nextSize > size ? nextSize : size];
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System.arraycopy(locals, 0, newLocals, 0, count);
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locals = newLocals;
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}
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} else if (size > 0)
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locals = new LocalInfo[size];
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}
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/**
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* Adds a local info to this variable set.
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*/
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public boolean add(Object li) {
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if (contains(li))
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return false;
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grow(1);
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locals[count++] = (LocalInfo) li;
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return true;
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}
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/**
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* Checks if the variable set contains the given local info.
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*/
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public boolean contains(Object li) {
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li = ((LocalInfo) li).getLocalInfo();
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for (int i=0; i<count;i++)
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if (locals[i].getLocalInfo() == li)
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return true;
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return false;
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}
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/**
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* Checks if the variable set contains a local with the given name.
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*/
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public final boolean containsSlot(int slot) {
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return findSlot(slot) != null;
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}
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/**
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* Checks if the variable set contains a local with the given name.
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*/
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public LocalInfo findLocal(String name) {
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for (int i=0; i<count;i++)
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if (locals[i].getName().equals(name))
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return locals[i];
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return null;
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}
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/**
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* Checks if the variable set contains a local with the given slot.
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*/
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public LocalInfo findSlot(int slot) {
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for (int i=0; i<count;i++)
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if (locals[i].getSlot() == slot)
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return locals[i];
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return null;
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}
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/**
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* Removes a local info from this variable set.
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*/
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public boolean remove(Object li) {
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li = ((LocalInfo) li).getLocalInfo();
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for (int i=0; i<count;i++) {
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if (locals[i].getLocalInfo() == li) {
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locals[i] = locals[--count];
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locals[count] = null;
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return true;
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}
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}
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return false;
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}
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public int size() {
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return count;
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}
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public Iterator iterator() {
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return new Iterator() {
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int pos = 0;
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public boolean hasNext() {
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return pos < count;
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}
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public Object next() {
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return locals[pos++];
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}
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public void remove() {
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if (pos < count)
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System.arraycopy(locals, pos,
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locals, pos-1, count - pos);
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count--;
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pos--;
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locals[count] = null;
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}
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};
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}
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/**
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* Removes everything from this variable set.
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*/
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public void clear() {
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locals = null;
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count = 0;
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}
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public Object clone() {
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try {
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VariableSet other = (VariableSet) super.clone();
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if (count > 0) {
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other.locals = new LocalInfo[count];
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System.arraycopy(locals, 0, other.locals, 0, count);
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}
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return other;
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} catch (CloneNotSupportedException ex) {
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throw new InternalError("Clone?");
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}
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}
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/**
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* Intersects the current VariableSet with another and returns the
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* intersection. The existing VariableSet are not changed.
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* @param vs the other variable set.
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*/
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public VariableSet intersect(VariableSet vs) {
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VariableSet intersection = new VariableSet();
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intersection.grow(Math.min(count, vs.count));
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big_loop:
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for (int i=0; i<count; i++) {
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LocalInfo li = locals[i];
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int slot = li.getSlot();
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if (vs.containsSlot(slot)
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&& !intersection.containsSlot(slot))
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intersection.locals[intersection.count++] = li.getLocalInfo();
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}
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return intersection;
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}
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/**
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* Add the variables in gen to the current set, unless there are
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* variables in kill using the same slot.
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* @param gen The gen set.
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* @param kill The kill set.
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*/
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public void mergeGenKill(Collection gen, SlotSet kill) {
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grow(gen.size());
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big_loop:
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for (Iterator i = gen.iterator(); i.hasNext(); ) {
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LocalInfo li2 = (LocalInfo) i.next();
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if (!kill.containsSlot(li2.getSlot()))
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add(li2.getLocalInfo());
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}
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}
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/**
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* Merges the localinfo with this gen set and remove all variables
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* that are killed by it. This differs by mergeWrite in that it merges
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* li.
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* @param li the variable to add.
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*/
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public void mergeRead(LocalInfo li) {
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int slot = li.getSlot();
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for (int i=0; i < count; ) {
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if (locals[i].getSlot() == slot) {
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li.combineWith(locals[i]);
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locals[i] = locals[--count];
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} else
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i++;
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}
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add(li);
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}
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/**
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* Add li to this gen set and remove all variables that are killed
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* by it.
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* @param li the variable to add.
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*/
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public void mergeWrite(LocalInfo li) {
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int slot = li.getSlot();
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for (int i=0; i < count; ) {
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if (locals[i].getSlot() == slot)
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locals[i] = locals[--count];
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else
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i++;
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}
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add(li);
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}
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}
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