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131 lines
3.9 KiB
131 lines
3.9 KiB
/* InstructionContainer 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.expr.Expression;
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import net.sf.jode.expr.InvokeOperator;
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import net.sf.jode.util.SimpleSet;
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///#def COLLECTIONS java.util
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import java.util.Set;
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///#enddef
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/**
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* This is a method for block containing a single instruction.
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*/
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public abstract class InstructionContainer extends StructuredBlock {
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/**
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* The instruction.
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*/
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Expression instr;
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public InstructionContainer(Expression instr) {
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this.instr = instr;
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}
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/**
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* Make the declarations, i.e. initialize the declare variable
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* to correct values. This will declare every variable that
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* is marked as used, but not done.<br>
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*
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* This will now also combine locals, that use the same slot, have
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* compatible types and are declared in the same block. <br>
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*
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* @param done The set of the already declare variables.
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*/
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public void makeDeclaration(Set done) {
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if (instr != null)
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instr.makeDeclaration(done);
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super.makeDeclaration(done);
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}
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/**
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* This method should remove local variables that are only written
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* and read one time directly after another. <br>
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*
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* This is especially important for stack locals, that are created
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* when there are unusual swap or dup instructions, but also makes
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* inlined functions more pretty (but not that close to the
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* bytecode).
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*/
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public void removeOnetimeLocals() {
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if (instr != null)
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instr = instr.removeOnetimeLocals();
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super.removeOnetimeLocals();
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}
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/**
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* Fill all in variables into the given VariableSet.
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* @param in The VariableSet, the in variables should be stored to.
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*/
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public void fillInGenSet(Set in, Set gen) {
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if (instr != null)
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instr.fillInGenSet(in, gen);
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}
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public Set getDeclarables() {
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Set used = new SimpleSet();
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if (instr != null)
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instr.fillDeclarables(used);
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return used;
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}
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public boolean doTransformations() {
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if (instr == null)
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return false;
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/* Do on the fly access$ transformation, since some further
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* operations need this.
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*/
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if (instr instanceof InvokeOperator) {
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Expression expr = ((InvokeOperator)instr).simplifyAccess();
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if (expr != null)
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instr = expr;
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}
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StructuredBlock last = flowBlock.lastModified;
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return CreateNewConstructor.transform(this, last)
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|| CreateAssignExpression.transform(this, last)
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|| CreateExpression.transform(this, last)
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|| CreatePrePostIncExpression.transform(this, last)
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|| CreateIfThenElseOperator.create(this, last)
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|| CreateConstantArray.transform(this, last)
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|| CreateCheckNull.transformJavac(this, last);
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}
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/**
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* Get the contained instruction.
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* @return the contained instruction.
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*/
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public final Expression getInstruction() {
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return instr;
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}
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public void simplify() {
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if (instr != null)
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instr = instr.simplify();
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super.simplify();
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}
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/**
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* Set the contained instruction.
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* @param instr the new instruction.
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*/
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public final void setInstruction(Expression instr) {
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this.instr = instr;
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}
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}
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